HITACHI ZW310-7 Technical Manual

ZW310

-7

WHEEL LOADER TECHNICAL MANUAL

PART NO.

TONFQ50-EN-00

Technical Manual

Operational Principle

OPERATIONAL PRINCIPLE

URL:http://www.hitachi-c-m.com

ZW310

Wheel Loader

-7

PRINTED IN JAPAN (K) 2022, 02

TONFQ50-EN-00

Service Manual consists of the following separate Part No. Technical Manual (Operational Principle) : Vol. No.TONFQ50-EN-00 Technical Manual (Troubleshooting) : Vol. No.TTNFQ50-EN-00 Workshop Manual : Vol. No.WNFQ50-EN-00

Hitachi Construction Machinery Co., Ltd.

Tokyo, Japan

INTRODUCTION

To The Reader

This manual is written for an experienced technician to provide technical information needed to maintain and repair this machine.

The machine specication and description according to destination may be explained on this manual.

● Be sure to thoroughly read this manual for correct product information and service procedures.

● If you have any questions or comments, at if you found any errors regarding the contents of this manual, please

contact using “Service Manual Revision Request Form” at the end of this manual. (Note: Do not tear o the form. Copy this form for usage.)

• Hitachi Construction Machinery Co., Ltd.

• E-mail: HCM-TIC-GES@hitachi-kenki.com

All information, illustrations and specications in this manual are based on the latest product information available at the time of publication. The right is reserved to make changes at any time without notice.

Additional References

Please refer to the other materials (operator’s manual, parts catalog, engine technical material and Hitachi training material etc.) in addition to this manual.

Manual Composition

This manual consists the Technical Manual, the Workshop Manual and the Engine Manual.

● Information included in the Technical Manual: Technical information needed for redelivery and delivery

• Operation and activation of all devices and systems, operational performance tests, and troubleshooting

procedures.

● Information included in the Workshop Manual: Technical information needed for maintenance and repair of the machine

• Tools and devices needed for maintenance and repair, maintenance standards, and removal / installation and

assemble / disassemble procedures

● Information included in the Engine Manual: Technical information needed for redelivery and delivery and maintenance and repair of the machine

• Operation and activation of all devices and systems, troubleshooting and assemble / disassemble procedures

Page Number

Each page has a number, located on the center lower part of the page. Each number contains the following information:

● Technical Manual: T 1-3-5

T Technical Manual 1 Section Number 3 Group Number 5 Consecutive Page Number for Each Group

● Workshop Manual: W 1-3-2-5

W Workshop Manual 1 Section Number 3 Group Number 2 Sub Group Number 5 Consecutive Page Number for Each Group

TONFQ50-EN-00(28/02/2022)

IN-1

INTRODUCTION

Trademark

AdBlue® is a registered trademark of the Verband der Automobilindustrie e.V. (VDA).

Safety Alert Symbol and Headline Notations

In this manual, the following safety alert symbol and signal words are used to alert the reader to the potential for personal injury of machine damage.

WARNING

This is the safety alert symbol. When you see this symbol, be alert to the potential for personal injury. Never fail to follow the safety instructions prescribed along with the safety alert symbol. The safety alert symbol is also used to draw attention to component/part weights. To avoid injury and damage, be sure to use appropriate lifting techniques and equipment when lifting heavy parts.

CAUTION

Indicates potentially hazardous situation which could, if not avoided, result in personal injury or death. This is also provided before the indication of mass to draw attention to safety during handling of the machine.

IMPORTANT

Indicates a situation which, if not conformed to the instructions, could result in damage to the machine. This header is given to matters that are important in terms of operation and management.

NOTE

Indicates supplementary technical information or know-how.

Units Used

SI Units (International System of Units) are used in this manual.

A table for conversion from SI units to other system units is shown below for reference purposes.

Quantity To Convert From Into Multiply By

Length mm in 0.03937

mm ft 0.003281

Volume L US gal 0.2642

L US qt 1.057

3

m Weight kg lb 2.205 Force N kgf 0.10197

N lbf 0.2248 Torque N·m kgf·m 0.10197 Pressure MPa

MPa psi 145.0 Power kW PS 1.360

kW HP 1.341 Temperature °C °F °C×1.8+32

3

yd

kgf/cm

1.308

2

10.197

TONFQ50-EN-00(28/02/2022)

IN-2

INTRODUCTION

Quantity To Convert From Into Multiply By

Velocity km/h mph 0.6214

-1

min Flow rate L/min US gpm 0.2642

mL/rev cc/rev 1.0

rpm 1.0

TONFQ50-EN-00(28/02/2022)

IN-3

MEMO

INTRODUCTION

TONFQ50-EN-00(28/02/2022)

IN-4

Symbol and Abbreviation

SYMBOL AND ABBREVIATION

Symbol and Abbrevia

tion

TO Technical manual (Operational

principle)

TT Technical manual (Trouble

shooting) T/M Technical manual Technical manual. W, W/M Workshop manual Workshop manual (Removal and Installation, Disassembly and

MC Main Controller Main controller. MC controls the engine, pump, and valve ac

ECM Engine Control Module Engine controller. ECM controls fuel injection amount accord

VGS Variable Geometry System con

troller

GSM Global System for Mobile com

munications controller

GPS Global Positioning System Global positioning system. CAN Controller Area Network CAN communication. CAN is a serial communications protocol

A/C Air Conditioner Air conditioner. OP, OPT Option Optional component. MPDr. Maintenance Pro Dr. MPDr. is software that troubleshooting, monitoring, and ad

A/I Auto-Idle Auto-idle. WU Warming-Up Warming-up. Li Low (Slow) Idle Minimum Rotation Engine Speed. ATT Attachment Attachment. Attachment is optional parts such as breaker,

HI, Hi High Travel fast position. LO, Lo Low Travel slow position. DPF Diesel Particulate Filter DPF is a lter which removes particulate matter (PM) including

DPD Diesel Particulate Diuser DPD is an exhaust emission control system, a type of DPF,

Part Name Explanation

Technical manual (Operational Principle).

Technical manual (Troubleshooting).

Assembly).

cording to the machine operating condition.

ing to the machine operating condition. Variable turbo controller. VGS is an exhaust turbo charged sys

tem to supercharge the exhaust energy while running the en gine at slow idle speed. VGS optimizes the turbine rotation, im proves the performance at slow-speed torque and the acceler ation, reduces fuel consumption, and reduces particulate mat ter (PM) by adjusting the nozzle opening of turbine housing.

Communication controller. GSM is a type of wireless communi cation system, is used in more than on 100 countries around Europe and Asia, and becomes the factual global standards of the mobile telephone.

internationally-standardized by ISO (International Organiza tion for Standardization).

justment.

crusher, and pulverizer in this manual.

the toxic substance of exhaust gas of the diesel engine. Ex haust particulate removal equipment.

which cleans up particulate matter (PM) of diesel engine ex haust gas. DPD is a ceramic lter which traps and lters PM of exhaust gas. DPD burns up accumulated PM when PM increa ses and regenerates the lter.

TONFQ50-EN-00(28/02/2022)

SY-1

SYMBOL AND ABBREVIATION

Symbol and Abbrevia

tion

DOC Diesel Oxidation Catalyst Oxidation catalyst for the diesel engine. Diesel oxidation cata

CSF Catalyzed Soot Filter Filter. The lter traps, burns, and remove particulate matter

PM Particulate Matter Particulate matter. EGR Exhaust Gas Recirculation The EGR control re-circulates a part of exhaust gas in the in

ML Moment Limiter ML crane. HRV Hose Rupture Valve Hose rupture valve. LLC Long Life Coolant Long life coolant. SCR Selective Catalytic Reduction The urea SCR system injects diesel exhaust uid to nitrogen

DCU Dosing Control Unit Urea SCR system controller. DCU controls the DEF injection

S/M Supply Module DEF supply module. The DEF supply module pumps diesel ex

D/M Dosing Module Dosing module. The dosing module (D/M) injects DEF into the

NOx Nitrogen Oxide Nitrogen oxide. DEF Diesel Exhaust Fluid DEF. The DEF concentration is 32.5%, which is specied in

TPD Torque Proportioning Dieren

tial

LSD Limited Slip Dierential Limited Slip Dierential. The Limited Slip Dierential prevents

TBAP Temperature Barometric At

mospheric Pressure JSS Joystick Steering System Joystick steering system. Operating the joystick steering lever

Part Name Explanation

lyst oxidizes unburnt fuel and raises exhaust temperature.

(PM) by using high-temperature-exhaust gas with diesel oxida tion catalyst. Catalyst is applied onto the lter. This advances PM burning.

take manifold and combines it with intake-air. Therefore, com bustion temperature is lowered, and generation of nitrogen oxides (NOx) is controlled.

oxide (NOx) exhausted from the engine and puries NOx.

amount according to the machine operating condition.

haust uid to the dosing module (D/M). Then, it returns diesel exhaust uid in the DEF circuit when the key switch is turned OFF.

exhaust piping according to the signal from DCU.

ISO22241. Torque proportioning dierential. The torque proportioning

dierential prevents the tires from slipping.

the tires from slipping. Atmospheric pressure, intake-air temperature, and intake-air

pressure.

controls the steering operation of the vehicle.

TONFQ50-EN-00(28/02/2022)

SY-2

CONTRASTING LIST OF PART NAME

Contrasting List of Part Name between Technical Manual and Parts Catalog

Part name in technical manual Part name in parts catalog Part No. Bucket Angle Sensor SENSOR;ANGLE YA00051742 Lift Arm Angle Sensor SENSOR;ANGLE YA00051742 TBAP Sensor SENSOR YL00009955 Hydraulic Oil Level Sensor SWITCH;LEVEL 4259787 Hydraulic Oil Temperature Sensor SENSOR 4697482 Fuel Level Sensor FLOAT 3582860580 Water Separator Sensor FILTER;FUEL YA00060028 Transmission Intermediate Shaft Speed Sensor SENSOR;REVOLUTION YB00004091 Torque Converter Output Shaft Speed Sensor SENSOR;REVOLUTION YB00004091 Torque Converter Input Shaft Speed Sensor SENSOR;REVOLUTION YB00004091 Vehicle Speed Sensor SENSOR;REVOLUTION YB00004091 Transmission Oil Temperature Sensor SENSOR;THERMO 3582960140 Service Brake Secondary Pressure Sensor SENSOR;PRESSURE YA00057050 Axle oil Temperature Sensor SENSOR;THERMO 3113925 Accelerator Pedal Sensor PEDAL;ACCELERATOR YA00003929 Brake Pedal Position Sensor SENSOR;ANGLE YA00050561 Fan Circuit Pressure Sensor SENSOR;PRESSURE 4436271 Pump Delivery Pressure Sensor SENSOR;PRESSURE 4436271 Primary Pilot Pressure Sensor SENSOR;PRESSURE YA00057050 Parking Brake Pressure Sensor SENSOR;PRES. 4436536 Service Brake Primary Pressure Sensor SENSOR;PRESSURE 4436271 Emergency Steering Pump Delivery Pressure Sen

sor Position Sensor SENSOR;INERTIA YK00000145 Frost Sensor SENSOR;THERMO XB00001052 Re-circulated Air Temperature Sensor SENSOR;THERMO XB00001061 Solar Radiation Sensor SENSOR 4405814 Refrigerant Pressure Sensor HOSE;COOLER 4312426110 Ambient Temperature Sensor SENSOR 4405815 Lift Arm Bottom Pressure Sensor SENSOR;PRESSURE 4436271 Lift Arm Rod Pressure Sensor SENSOR;PRESSURE 4436271 Object Detection Sensor SENSOR YA00055127 DEF Quality Sensor TANK;UREA YA00070108 DEF Tank Level Sensor TANK;UREA YA00070108 DEF Tank Temperature Sensor TANK;UREA YA00070108 Steering LS Pressure Sensor SENSOR;PRESSURE YA00057050

SENSOR;PRESSURE 4436271

TONFQ50-EN-00(28/02/2022)

CO-1

MEMO

CONTRASTING LIST OF PART NAME

TONFQ50-EN-00(28/02/2022)

CO-2

SECTION AND GROUP

CONTENTS

TECHNICAL MANUAL

( O p e r a t i o n a l

P r i n c i p l e )

SECTION 1 GENERAL

Group 1 Specications

Group 2 Component Layout

Group 3 Component Specications

SECTION 2 SYSTEM

Group 1 Controller

Group 2 Control System

Group 3 Engine System

Group 4 Hydraulic System

Group 5 Electrical System

SECTION 3 COMPONENT OPERATION

Group 1 Pump Device

Group 2 Control Valve

Group 3 Cooling Fan System

Group 4 Steering Pilot Valve

Group 5 Steering Valve

Group 6 Charging Circuit

Group 7 Drive Unit

Group 8 Axle

Group 9 Brake Valve

Group 10 DEF Supply System

Group 11 Others

MEMO

TONFQ50-EN-00(28/02/2022)

SECTION 1

GENERAL

CONTENTS

Specications............................................T1-1-1

Specications ........................................................................ T1-1-1

Component Layout...................................T1-2-1

Main Component (Overview)..........................................T1-2-1

Main Component................................................................. T1-2-2

Electrical System (Overview) ...........................................T1-2-3

Air Cleaner and Radiator Assembly............................... T1-2-3

Radiator Assembly............................................................... T1-2-4

Battery Box............................................................................. T1-2-4

Hydraulic Oil Tank................................................................ T1-2-5

Fuel Tank .................................................................................T1-2-6

Drive Unit................................................................................ T1-2-7

Front Axle................................................................................T1-2-7

Cab ............................................................................................ T1-2-8

Front Console........................................................................T1-2-9

Panel Switch.........................................................................T1-2-10

Right Console......................................................................T1-2-11

Operator's Seat and Joystick Steering System........T1-2-12

Rear Console........................................................................T1-2-13

Control Unit .........................................................................T1-2-14

Column Monitor.................................................................T1-2-15

Engine....................................................................................T1-2-16

Aftertreatment Device.....................................................T1-2-17

Fan Valve...............................................................................T1-2-17

Pump Device .......................................................................T1-2-18

Control Valve .......................................................................T1-2-19

Brake Valve...........................................................................T1-2-20

Brake Charge Valve/Combination Valve....................T1-2-20

Steering Valve .....................................................................T1-2-21

Ride Control Valve.............................................................T1-2-22

2-Spool Solenoid Valve Unit ..........................................T1-2-22

Emergency Steering Pump Unit...................................T1-2-23

DEF Tank................................................................................T1-2-23

DEF Supply Module...........................................................T1-2-24

Joystick Steering Hydraulic Component...................T1-2-24

Joystick Steering Valve.....................................................T1-2-25

Joystick Steering Solenoid Valve Unit........................T1-2-25

Steering Pilot Valve...........................................................T1-2-26

Component Specications.......................T1-3-1

Specications of Engine.................................................... T1-3-1

Specications of Engine Accessories............................T1-3-5

Specications of Hydraulic Component...................... T1-3-6

Electrical Component......................................................... T1-3-8

TONFQ50-EN-00(28/02/2022)

MEMO

TONFQ50-EN-00(28/02/2022)

R1

B

R2

E

G

H

I

F

D

A

C

SECTION 1 GENERAL

Group 1 Specifications

Specications

Model - ZW310-7

Bucket Capacity: heaped

Operating Weight kg 24390 Tipping Load (Full turn) kg 16040 Engine - Cummins L9 A: Overall Length mm 9025 B: Overall Width (Bucket) mm 2980 C: Overall Height mm 3530 D: Wheel Base mm 3540 E: Tread (front and rear tires) mm 2230 F: Ground Clearance mm 505 G: Bucket Hinge Height mm 4425 H: Dumping Clearance (45 °) mm 3090 I: Dumping Reach (45 °) mm 1305 R1: Minimum Rotation Radius mm 6420 R2: Minimum Rotation Radius mm 7455 Travel Speed Forward/Reverse (at Power mode) km/h 35.7/35.7(35.9/35.9)" Transmission Speeds (F/R) - 4/4 Articulation Angle (Left/Right) deg ( ° ) 37 Tire Size - 26.5R25

m

3

4.3

TNFQ-01-01-001-1 ja

NOTE

These specications are subject to change without notice.

TONFQ50-EN-00(28/02/2022)

T1-1-1

MEMO

SECTION 1 GENERAL

Group 1 Specifications

TONFQ50-EN-00(28/02/2022)

T1-1-2

Main Component (Overview)

1

2

3

4

1

9

14

10

11

5

6

7

17

8

13

12

15

16

18

SECTION 1 GENERAL

Group 2 Component Layout

1- Bucket 2- Bucket Link 3- Bell Crank 4- Bucket Cylinder

12- Work Light (Rear) 13- Pre-Cleaner

TNFQ-05-04-019-1 ja

5- Front Combination Light

(Headlight/Turn Signal Light/ Clearance Light/Hazard Light)

6- Horn

7- Work Light (Cab Front) 8- Refer to "Cab"T1-2-8. 9- DEF Tank Box 10- Lift Arm Cylinder 11- Lift Arm

14- Refer to "Battery

Box"T1-2-4.

17- Additional Work Light (Cab

Front)

15- Rear Combination Light (Turn

Signal Light/ Hazard Light/ Tail Light/ Brake Light)

16- Additional Work Light (Cab

Rear)

18- Object Detection Sensor

TNFQ-05-04-020-1 ja

TONFQ50-EN-00(28/02/2022)

T1-2-1

Main Component

11

33

8

41

44

45

36

3

16

20

39

18

42

40

1

37

2

35

32

38

17

30

29

28

24

26

25

31

21

22

1- Refer to "Air Cleaner and Radi

ator Assembly"T1-2-3.

2- Refer to "Aftertreatment De

vice"T1-2-17.

3- Refer to "Hydraulic Oil

Tank"T1-2-5.

8- Steering Accumulator

SECTION 1 GENERAL

Group 2 Component Layout

11- Refer to "Control

Valve"T1-2-19.

16- Refer to "Engine"T1-2-16. 18- Joystick Steering Valve 20- Stop Valve 32- Steering Valve 33- 2-Spool Solenoid Valve Unit

35- Ride Control Valve 36- Refer to"Joystick Steering Sol

enoid Valve Unit"T1-2-25.

37- Axle Oil Cooler 38- Brake Valve 39- Reducing Valve

TNFQ-05-04-021-1 ja

40- Refer to "Brake Charge Valve/

Combination Valve"T1-2-20.

41- Ride Control Accumulator 42- Axle Oil Filter 44- Transmission Oil Filter 45- Joystick Steering Accumulator

17- Refer to "Front Axle"T1-2-7. 22- Refer to "Drive Unit"T1-2-7. 24- Refer to "Fuel Tank"T1-2-6.

TONFQ50-EN-00(28/02/2022)

25- DEF Supply Module 26- DEF Tank 28- Rear Axle

29- Rear Propeller Shaft 30- Front Propeller Shaft 31- Steering Cylinder

T1-2-2

TNFQ-05-04-022-1 ja

Electrical System (Overview)

46

9

10

8

14

13

12

11

2

3

5

4

1

6

7

A

6

5

7

1

4

2

3

A

1- Refer to "Engine"T1-2-16. 2- Refer to "Hydraulic Oil

Tank"T1-2-5.

3- Refer to "Cab"T1-2-8. 4- Bucket Angle Sensor

5- Lift Arm Angle Sensor 6- Refer to "Battery

7- Refer to "Fuel Tank"T1-2-6. 8- Refer to "DEF Tank"T1-2-23.

SECTION 1 GENERAL

Group 2 Component Layout

9- Back Buzzer 10- Refer to "DEF Supply Mod

Box"T1-2-4.

11- Lift Arm Rod Pressure Sensor

ule"T1-2-24.

TNFQ-05-04-023-1 ja

12- Lift Arm Bottom Pressure Sen

sor 13- Intake-Air Heater Relay 14- Starter Relay 1 46- Refer to "Emergency Steering

Pump Unit"T1-2-23.

Air Cleaner and Radiator Assembly

1- Air Cleaner 2- Refer to "Radiator Assem

bly"T1-2-4.

3- Refer to "Fan Valve"T1-2-17. 4- Expansion Tank 5- TBAP Sensor

6- AIR CLEANER RESTRICTION

SWITCH

7- Coolant Level Switch

TNFQ-05-04-005-1 ja

TONFQ50-EN-00(28/02/2022)

T1-2-3

Radiator Assembly

A

1

6

2

3

5

4

A

a

A

10

11

8

9

7

6

5

1

2

3

A

4

SECTION 1 GENERAL

Group 2 Component Layout

TNFQ-05-04-001-1 ja

a- Machine Front Side

1- Expansion Tank 2- Radiator

3- Oil cooler 4- Intercooler

5- Torque Converter Cooler 6- Fan Motor

Battery Box

1- Battery Box 2- Battery 3- Battery Disconnect Switch

4- Battery Disconnect Switch In

5- Battery Relay

dicator Light

6- Fusible Link (30 A) 7- Fusible Link (70 A) 8- Fusible Link (120 A)

9- Fusible Link (120 A) 10- Fusible Link (30 A) 11- Fusible Link (140 A)

TNFQ-05-04-006-1 ja

TONFQ50-EN-00(28/02/2022)

T1-2-4

Hydraulic Oil Tank

A

4

2

5

6

3

a

A

1

SECTION 1 GENERAL

Group 2 Component Layout

TNFQ-05-04-007-1 ja

a- Machine Front Side

1- Hydraulic Oil Tank 2- Hydraulic Oil Level Sensor

3- Washer Tank 4- Hydraulic Oil Temperature

Sensor

5- Rear Washer Motor 6- Front Washer Motor

TONFQ50-EN-00(28/02/2022)

T1-2-5

Fuel Tank

A

B

4

5

2

3

6

1

B

a

A

SECTION 1 GENERAL

Group 2 Component Layout

TNFQ-05-04-002-1 ja

a- Machine Front Side

1- Fuel Tank 2- Fuel Level Sensor

3- Fuel Pump 4- Fuel Pre-Filter

5- Water Separator Sensor 6- Fuel Main Filter

TONFQ50-EN-00(28/02/2022)

T1-2-6

Drive Unit

A

6

2

9

20

8

11

10

4

22

3

A

a

18

21

1

7

23

24

5

19

12 13 14 15

16 17

1

2

SECTION 1 GENERAL

Group 2 Component Layout

a- Machine Front Side

1- Torque Converter 2- Torque Converter Charging

Pump 3- Drive Shaft In Main Pump 4- Parking Brake 5- Strainer 6- Air Breather 7- Transmission Control Valve 8- Torque Converter Output

Shaft Speed Sensor

Front Axle

TNFQ-05-04-025-1 ja

9- Torque Converter Input Shaft

Speed Sensor 10- Vehicle Speed Sensor 11- Transmission Intermediate

Shaft Speed Sensor 12- Forward Clutch Solenoid

Valve 13- Reverse Clutch Solenoid Valve 14- First Speed Clutch Solenoid

Valve

15- Second Speed Clutch Sole

noid Valve

16- Third Speed Clutch Solenoid

Valve

17- Fourth Speed Clutch Solenoid

Valve

18- Lock Up Clutch Solenoid

Valve

19- Parking Brake Pressure Sensor

20- Transmission Oil Temperature

Sensor

21- Flange (For Main Propeller

Shaft)

22- Flange (For Front Propeller

Shaft)

23- Flange (For Rear Propeller

Shaft)

24- Drain Port

1- Service Brake Secondary Pres

sure Sensor

TONFQ50-EN-00(28/02/2022)

2- Axle Oil Temperature Sensor

T1-2-7

TNEE-01-02-018-1 ja

Cab

A

B

D

E F

13141011

12

16

15

9

18

b

E

D

e

c

3

8

2

1

B

A

a

e

7

6

4

17

5

F

SECTION 1 GENERAL

Group 2 Component Layout

a- (Refer to "Front Console"T1-2-9.) c- (Refer to "Rear Console"T1-2-13.) b- (Refer to "Right Console"T1-2-11.) e- (Refer to "Control Unit"T1-2-14.)

TONFQ50-EN-00(28/02/2022)

TNUD-01-02-105-1 ja

T1-2-8

7

8

2 3 4

5

6

17

13

20

9

21

12

10

1

18

22

15

14

16

19

SECTION 1 GENERAL

Group 2 Component Layout

1- Speaker 2- Satellite Communication An

tenna 3- Upper Switch Panel 4- Rear Wiper Motor

Front Console

5- Radio 6- Accelerator Pedal Sensor 7- Brake Pedal Position Sensor 8- Cab Light 9- Brake Pedal Switch

10- Front Wiper Relay 2 11- Front Wiper Relay 1 12- Auto Shut-Down Relay 13- Key Switch ON Cut Relay 14- ACC Cut Relay

15- Front Wiper Motor 16- Mirror Heater Relay 17- Beacon Light 18- Beacon Light Switch

1- Neutral Lever Lock for For

ward/Reverse Lever 2- Steering Wheel 3- Refer to"Column Moni

tor"T1-2-15.

4- Horn Switch 5- Radio

6- Sub Monitor 7- Panel Switch 8- Rear View Mirror Angle Ad

justment Switch 9- 24 V Power Supply Socket 10- Emergency Steering Check

Switch

12- Accelerator Pedal 13- Brake Pedal 14- Hazard Switch 15- Work Light Switch 16- Parking Switch 17- Air Conditioner Control Panel 18- USB Power Source

TNUD-01-02-106-1 ja

19- Forward/Reverse Lever, Shift

Switch

20- Turn Signal Lever, Light

Switch, Dimmer Switch 21- Key Switch 22- Seat Belt Switch

TONFQ50-EN-00(28/02/2022)

T1-2-9

Panel Switch

8 161

6 143 11

7 152 10

9

5 134 12

SECTION 1 GENERAL

Group 2 Component Layout

1- Auto Shut-Down Switch 2- Clutch Cut Position Switch 3- Fan Reverse Rotation Switch 4- Dump Approach Mode Selec

tor Switch

5- Forward/Reverse Selector

Switch 6- Gear Restriction Switch 7- Travel Mode Switch 8- Lock Up Switch

9- Power Mode Switch 10- Ride Control Switch 11- Rear Wiper Switch 12- Rear Washer Switch 13- Front Washer Switch

TONFQ50-EN-00(28/02/2022)

T1-2-10

TNFQ-05-04-024-1 ja

14- Front Wiper Switch 15- Regeneration Inhibit Switch 16- Manual Regeneration Switch

Right Console

12

11

10

9

6

5

4

3

2

1

17

16

15

14 13

6

8

4

19

18

5

9

10

11

12

15

16

14 13

17

SECTION 1 GENERAL

Group 2 Component Layout

Fingertip Control Lever Type

TNUD-01-02-108-2 ja

1- Auxiliary 1 Control Lever 2- Bucket Control Lever 3- Lift Arm Control Lever 4- Control Lever Lock Switch

5- Forward/Reverse Switch 6- Rotary Device 9- Load cancel Switch 10- Tip O Selector Switch

11- Track Clear Switch 12- Add Load Switch 13- Hold Switch 14- Mist Switch

15- Downshift Switch 16- Quick Power Switch 17- Horn Switch

Multi-Function Joystick Lever Type

TNUD-01-02-109-2 ja

4- Control Lever Lock Switch 5- Forward/Reverse Switch 6- Rotary Device 9- Load cancel Switch

10- Tip O Selector Switch 11- Track Clear Switch 12- Add Load Switch 13- Hold Switch

14- Mist Switch 15- Downshift Switch 16- Quick Power Switch 17- Horn Switch

18- Multi Function Joystick Lever 19- Auxiliary 1 Control Switch (For

Third Spool)

TONFQ50-EN-00(28/02/2022)

T1-2-11

3

A

1

2

54

8

7

9

A

SECTION 1 GENERAL

Group 2 Component Layout

Operator's Seat and Joystick Steering System

1- Switch Box 2- Left Console Pipe 3- Left Armrest

4- Downshift Switch 5- Forward/Reverse Switch (JSS)

7- Joystick Steering Selector

8- Joystick Steering Lever

Switch

9- Left Console Lock Release

Lever

TNUD-01-02-110-2 ja

TONFQ50-EN-00(28/02/2022)

T1-2-12

Rear Console

A

B

E

8

9

10

1

2 3 4 5

32

33

40

35

31

a

39

38

37

36

7

6

1211

27

17

26

16

2221

13

28

18

23

14

29

19

24

15

30

20

25

B

A

E

31

37

41

SECTION 1 GENERAL

Group 2 Component Layout

TONFQ50-EN-00(28/02/2022)

TNUD-01-02-111-2 ja

T1-2-13

a- Machine Front Side

A

D

B

4

68

5

7

3

2

b

a

1

A

D

B

SECTION 1 GENERAL

Group 2 Component Layout

1- Back Buzzer Relay (A-R5) 2- Not Used 3- High Beam Relay (A-R3) 4- Headlight Relay (Right) (A-R2) 5- Headlight Relay (Left) (A-R1) 6- Starter Cut Relay (A-R10) 7- Horn Relay (A-R9) 8- Turn Signal Light Relay (Right)

(A-R8) 9- Work Light Relay (Rear) (A-R7) 10- Work Light Relay (Front) (A-

R6)

Control Unit

11- Load Dump Relay (B-R5) 12- Brake Light Relay (B-R4) 13- PLCU Relay (B-R3) 14- Parking Brake Relay 2 (B-R2) 15- Parking Brake Relay 1 (B-R1) 16- Rear Washer Relay (B-R10) 17- Rear Wiper Relay (B-R9) 18- Front Washer Relay (B-R8) 19- Turn Signal Light Relay (Left)

(B-R7) 20- Neutral Relay (B-R6) 21- DEF Heater Relay 3 (C-R5)

22- DEF Heater Relay 2 (C-R4) 23- DEF Heater Relay 1 (C-R3) 24- SCR Sensor Relay (C-R2) 25- DEF Supply Module Relay (C-

R1)

26- Additional Work Light Relay

(Cab Front) (C-R10)

27- Additional Work Light Relay

(Cab Rear) (C-R9) 28- Not Used 29- Not Used 30- Beacon Light Relay (C-R6)

31- MPDr. Connector 32- Relay Box A 33- Relay Box B 35- Relay Box C 36- Engine Diagnostic Connector 37- Fuse Box A 38- Fuse Box B 39- Fuse Box C 40- Position Sensor 41- Pressure Sensor (Refrigerant

Pressure)

a- Machine Front Side b- Main Monitor

TONFQ50-EN-00(28/02/2022)

T1-2-14

TNUD-01-02-112-1 ja

1

32

33

34

35

36

37 38

2 3 4

5

6

7

8

9

10

11

12

13

14

15

24252627 1923 394041 1822 1721 20 16

31

29

30

28

SECTION 1 GENERAL

Group 2 Component Layout

1- Air Conditioner Controller 2- Monitor Controller

Column Monitor

3- TCU 4- MC

5- PLCU 6- Aerial Angle Controller

7- GSM/GPS 8- Flasher Relay

1- Left Turn Signal Light Indica

tor 2- High Beam Indicator 3- Work Light Indicator 4- Clearance Light Indicator 5- Right Turn Signal Light Indica

tor 6- Service Indicator 7- Fuel Gauge 8- Brake Oil Pressure Indicator 9- Brake Oil Level Indicator 10- Not Used 11- Steering Oil Pressure Indicator 12- Emergency Steering Indicator

13- Urea Alarm 14- Water Separator Indicator 15- Fuel Filter Restriction Indica

tor

16- Communication System Error

Indicator 17- Discharge Warning Indicator 18- Control Lever Lock Indicator 19- Parking Brake Indicator 20- Fuel Level Indicator 21- Preheat Indicator 22- Aftertreatment Device Indica

tor

23- Fan Reverse Rotation Indica

tor 24- Seat belt Indicator 25- Transmission Oil Temperature

Gauge 26- Main Pump Oil Pressure Indi

cator 27- Axle Oil Temperature Indica

tor 28- Transmission Warning Indica

tor 29- Transmission Oil Temperature

Indicator

TNUD-01-02-113-1 ja

30- Hydraulic Oil Temperature In

dicator 31- Hydraulic Oil Level Indicator 32- Coolant Level Indicator 33- Air Filter Restriction Indicator 34- Engine Oil Pressure Indicator 35- Overheat Indicator 36- Engine Trouble Indicator 37- Coolant Temperature Gauge 38- Main Monitor 39- Select/Conrm Button 40- Up Button 41- Down Button

TONFQ50-EN-00(28/02/2022)

T1-2-15

Engine

1

2

3

9

11

12

14

13

10

15

8

7

6

5

4

SECTION 1 GENERAL

Group 2 Component Layout

1- Crankcase Pressure Sensor 2- Supply Pump 3- Cam Angle Sensor 4- Boost Pressure/Temperature

Sensor

5- Common Rail Pressure Sensor 6- Fuel Main Filter 7- Crank Speed Sensor 8- Oil Pressure Switch 9- ECM

10- Exhaust Pressure Sensor 11- Alternator 12- Coolant Temperature Sensor 13- Starter 14- Engine Oil Filter

TNFQ-05-04-033-1 ja

15- Vibration Damper

TONFQ50-EN-00(28/02/2022)

T1-2-16

Aftertreatment Device

1

9

10

11

12

8

6

7

5

2

4

3

a

5

4

a

1

3

2

SECTION 1 GENERAL

Group 2 Component Layout

TNFQ-05-04-010-1 ja

a- Machine Front Side

1- Upstream NOx Sensor 2- Dosing Module 3- Downstream NOx Sensor 4- SCR Outlet Exhaust Tempera

Fan Valve

ture Sensor

5- SCR Inlet Exhaust Tempera

ture Sensor 6- Dierential Pressure Sensor 7- DOC Outlet Exhaust Tempera

ture Sensor

8- DOC Inlet Exhaust Tempera

ture Sensor

9- DOC (Diesel Oxidation Cata

lyst)

10- Filter (CSF)

11- Mixer Module 12- SCR Catalyst

TNEE-01-02-031-2 ja

TONFQ50-EN-00(28/02/2022)

T1-2-17

a- Machine Front Side

7

10

9

2

1

8

a

SECTION 1 GENERAL

Group 2 Component Layout

1- Fan Speed Control Solenoid

Valve

Pump Device

2- Fan Reverse Rotation Control

Solenoid Valve

3- Fan Control Valve 4- Fan Reverse Rotation Spool

5- Fan Circuit Pressure Sensor

TNFQ-05-04-026-1 ja

a- Machine Front Side

1- Main Pump 2- Regulator 1

TONFQ50-EN-00(28/02/2022)

7- Torque Control Solenoid Valve 8- Regulator 2

9- Steering Pressure Switch 10- Pump Delivery Pressure Sen

sor

T1-2-18

Control Valve

3

1

a

6

2

11

7

12

10

4

5

9

8

SECTION 1 GENERAL

Group 2 Component Layout

a- Machine Front Side

1- Main Relief Valve 2- Overload Relief Valve (Bucket:

Rod Side)

3- Overload Relief Valve (Bucket:

Bottom Side)

12 Negative Control Pressure

Sensor

4- Overload Relief Valve (Lift

Arm: Rod Side) 5- Ride Control Selector Sole

noid Valve 6- Bleed O Compensator

TNFQ-05-04-013-1 ja

7- Pump Flow Rate Control Valve 8- Bucket Dump Solenoid Valve 9- Lift Arm Raise Solenoid Valve 10- Bucket Tilt Solenoid Valve 11- Lift Arm Lower Solenoid Valve

TONFQ50-EN-00(28/02/2022)

T1-2-19

Brake Valve

2

1

a

A

a

A

11

1

2

3

4

12

10

6

7

8

9

5

a- Machine Front Side

SECTION 1 GENERAL

Group 2 Component Layout

TNFQ-05-04-029-1 ja

1- Brake Oil Pressure Switch 2- Service Brake Secondary Pres

sure Sensor

Brake Charge Valve/Combination Valve

TONFQ50-EN-00(28/02/2022)

T1-2-20

TNFQ-05-04-017-1 ja

a- Machine Front Side

1

2

3

2

a

SECTION 1 GENERAL

Group 2 Component Layout

1- Brake Charge Valve 2- Service Brake Primary Pres

sure Sensor

3- Lift Arm Flow Rate Control

Solenoid Valve

Steering Valve

4- Service Brake Accumulator 5- Combination Valve 6- Parking Brake Solenoid Valve 7- Control Lever Lock Solenoid

Valve

8- Primary Pilot Pressure Sensor 9- Reducing Valve 10- Parking Brake Accumulator 11- Flow Combiner Control Valve 12- Pilot Filter

TNFQ-05-04-016-1 ja

a- Machine Front Side

1- Steering Main Relief Valve 2- Steering Overload Relief Valve 3- Emergency Steering Pump

Delivery Pressure Sensor

TONFQ50-EN-00(28/02/2022)

T1-2-21

Ride Control Valve

1

a

A2 A1

SECTION 1 GENERAL

Group 2 Component Layout

a- Machine Front Side

1- Ride Control Solenoid Valve

2-Spool Solenoid Valve Unit

A2- Auxiliary 1 Solenoid Valve A1- Auxiliary 2 Solenoid Valve

TNFQ-05-04-028-1 ja

TNUD-01-02-020-2 ja

TONFQ50-EN-00(28/02/2022)

T1-2-22

Emergency Steering Pump Unit

1

3

2

a

2

1

6

7

8

9

10

1

3

4

5

SECTION 1 GENERAL

Group 2 Component Layout

a- Machine Front Side

1- Relief Valve 2- Emergency Steering Pump 3- Emergency Steering Motor

DEF Tank

TNFQ-05-04-027-1 ja

TONFQ50-EN-00(28/02/2022)

T1-2-23

TNFQ-05-04-003-1 ja

11 5, 6 7 8 9 10 11

1

6

5

42

3

10

7

3

4

6

5

2

1

9

8

a

SECTION 1 GENERAL

Group 2 Component Layout

1- DEF Sensor Unit 2- DEF Tank 3- Coolant Heater Tube 4- DEF Tank Level/DEF Tank

Temperature/DEF Quality Sensor

DEF Supply Module

5- DEF Suction Filter 6- DEF Suction Tube 7- Coolant Port (To DEF Supply

Module) 8- DEF Port (From Dosing Mod

ule)

9- DEF Port (To DEF Supply Mod

ule)

10- Coolant Port (From Coolant

Control Valve)

TNFQ-05-04-004-1 ja

1- DEF Supply Module 2- DEF Hose 3- DEF Supply Module Main Fil

ter

4- Coolant Control Valve 5- DEF Hose 6- DEF Hose 7- Corrugate Tube

8- DEF Tube 9- Heating Wire 10- Thermoplastic Cover 11- Quick Connector

Joystick Steering Hydraulic Component

TONFQ50-EN-00(28/02/2022)

T1-2-24

TNFQ-05-04-018-1 ja

1

3

4

A

5

B

SECTION 1 GENERAL

Group 2 Component Layout

1- Refer to "Steering

Valve"T1-2-21.

2- Refer to "Steering Pilot

Valve"T1-2-26.

3- Refer to "Joystick Steering

Valve"T1-2-25.*)

4- Refer to "Joystick Steering Sol

enoid Valve Unit"T1-2-25.*)

5- Stop Valve (Left) 6- Stop Valve (Right)

7- Joystick Steering Accumulator 8- Steering Cylinder (Right) 9- Steering Cylinder (Left) 10- Reducing Valve

NOTE

*

The component is an optional hydraulic component included with the joystick steering specication.

Joystick Steering Valve

1- Cuto Solenoid Valve

Joystick Steering Solenoid Valve Unit

TNUD-01-02-117-1 ja

TNFQ-05-04-031-1 ja

A- Right Steering Solenoid Valve B- Left Steering Solenoid Valve

3- Pilot Pressure Sensor for

Steering (Left)

TONFQ50-EN-00(28/02/2022)

4- Pilot Pressure Sensor for

Steering (Right)

5- Steering Source Pressure Sen

sor

T1-2-25

Steering Pilot Valve

1

1- Steering LS Pressure Sensor

SECTION 1 GENERAL

Group 2 Component Layout

TNFQ-05-04-032-1 ja

TONFQ50-EN-00(28/02/2022)

T1-2-26

SECTION 1 GENERAL

Group 3 Component Specifications

Specications of Engine

Manufacturer Cummins Inc. Model L9 Type Diesel, 4-Cycle, 6-Cylinder, Vertical Type, Water-cooled, Direct Injection Type, w/ Super

charger, Intake Air Cooling Type Cyl. No.- Bore × Stroke 6-114 mm × 145 mm Total Displacement

Rated Output (gross)

Dry Weight 753 kg Firing Order 1-5-3-6-2-4 Rotating Direction Counterclockwise Viewed From Flywheel Side Dimensions: Overall Length ×

Overall Width × Overall Height

8900 cm

213 kW/2000 min

1130 × 931 × 1108 mm

3

-1

TONFQ50-EN-00(28/02/2022)

T1-3-1

SECTION 1 GENERAL

Group 3 Component Specifications

Cooling System Cooling Fan Dia. 850 mm, 6 Hybrid Blades

Thermostat Cracking Temperature at Atmospheric Pressure: 82 °C

Full Open: 94 °C

Water Pump Centrifugal Type

Lubrication System Type of Lubrication Pump Trochoid Type

Oil Filter Strata Pore (Plastic ber)/Spin-on Type Oil Cooler Water Cooled Type

Starting System Electrical Motor Electromagnetic Pinion Shift Reduction Type

Voltage/Output 24 V/7.8 kW Preheat System Type Grid Air Heater (24 V/100 A) Engine Stop System Type Fuel Shut-O (Electronic Control) Alternator Type AC Type

Voltage/Output 24 V/95 A Supercharging System Type Exhaust-Turbocharger Type, Forced Lubrication Fuel System Type Common Rail Type, HPCR Type

Governor Electronic All Speed Control

Injection Nozzle Electrical Multi-Hole Injector

Fuel Filter Nanonet (Plastic ber)/Spin-on Type

TONFQ50-EN-00(28/02/2022)

T1-3-2

SECTION 1 GENERAL

Group 3 Component Specifications

IMPORTANT

This table shows design specications, which are not servicing standards.

Performance (New Parts) Fuel Consumption Rate

Maximum Output Torque (Gross)

No Load Speed

Valve Clearance (Intake/ Exhaust)

219⁺¹¹₀ g/kW·h/(Full Load: 2000 min-1)

1636⁺⁸²₀ N·m at 1100 min

Slow: 800±30 min

Fast: 2100±30 min

0.305/0.559 mm (When Cold)

-1

TONFQ50-EN-00(28/02/2022)

T1-3-3

N

T

min

-1

N•m

N

kW

P

min

-1

SECTION 1 GENERAL

Group 3 Component Specifications

Engine Performance Curve (L9)

Test Condition:

1. In accordance with SAEJ 1995 conditions (measurement of engine power and measurement method) under standard atmospheric pressure.

2. Equipped with alternator. Without fan.

TNFQ-01-03-001-1 ja

T: Torque N: Engine Speed

P: Output N: Engine Speed

TONFQ50-EN-00(28/02/2022)

T1-3-4

TNFQ-01-03-002-1 ja

N

g/kW･h

q

min

-1

SECTION 1 GENERAL

Group 3 Component Specifications

q: Fuel Consumption Rate N: Engine Speed

TNFQ-01-03-003-1 ja

Specications of Engine Accessories

Radiator Assembly Type Radiator, Oil Cooler and Intercooler Parallel Type Assembly,

Torque Converter Cooler Tandem Type Assembly

Radiator Oil cooler

Airtight Test Pressure 0.22 MPa 2.25 MPa

Intercooler Torque Converter Cooler

Airtight Test Pressure 0.3 MPa 2.25 MPa

Expansion Tank Total Capacity 7.4 L

Cap Opening Pressure 90 kPa

TONFQ50-EN-00(28/02/2022)

T1-3-5

SECTION 1 GENERAL

Group 3 Component Specifications

Battery Type 195G51

Nominal Voltage 12 V Capacity Over 140 Ah (5-Hour Rate), over 147 Ah (20-Hour Rate) CCA 930 CCA

Specications of Hydraulic Component

Pump Device Gear Ratio Main Pump: 1, Pilot Pump: 1 Main Pump Type Swash Plate Type Variable Displacement Axial Piston

Pump Application Steering/Loading Circuit Theoretical Displacement

Rated Pressure 34.3 MPa

Regulator Type Hydraulic Pressure Operated Type Solenoid Valve Application Main pump Torque Control Pilot Pump Type Fixed Displacement Gear Pump

Theoretical Displacement

Control Valve Type Pilot Pressure Operated Type (2-Spools+1-Spool)

Main Relief Set Pressure 31.4 MPa at 170 L/min Over Load Relief Set Pressure 37.3 MPa at 50 L/min (Lift Arm Raise)

Low-Pressure Relief Valve Set Pressure

Steering Valve Type Flow Amp Type

Main Relief Set Pressure 27.4 MPa Over Load Relief Set Pressure 32.5 MPa at 15 L/min

Steering Pilot Valve Type NV‐SG‐E Type

Gerotor Displacement

Steering Accumulator Gas Capacity 0.2 L

Gas Charging Pressure 5.0 MPa at 20 °C

Ride Control Valve Rated Current 700 mA

Coil Resistance 17.5 Ω

Brake Valve Brake Pressure 4.55 MPa (Secondary Pressure) Brake Charging Valve Charging Pressure Cut In Pressure: 9.3 MPa

Service Brake Accumulator Gas Capacity 2.5 L × (2 used)

Gas Charging Pressure 4.2 MPa at 20 °C

Parking Brake Accumulator Gas Capacity 0.5 L

Gas Charging Pressure 2.8 MPa at 20 °C

Ride Control Accumulator Gas Capacity 5.0 L

Gas Charging Pressure 5.0 MPa

Fan Motor Theoretical Displacement

80 cm3/rev × (2 used)

40.3 cm3/rev

37.3 MPa at 50 L/min (Bucket)

0.2 MPa

80 cm3/rev

Cut Out Pressure: 16 MPa

33.1 cm3/rev

TONFQ50-EN-00(28/02/2022)

T1-3-6

SECTION 1 GENERAL

Group 3 Component Specifications

Parking Brake Solenoid Valve

Torque Control Solenoid Valve

Control Lever Lock Sole noid Valve (Combination Valve)

2-Spool Solenoid Valve Unit

Fan Motor Speed Control Solenoid Valve (Fan Valve)

Fan Motor Reverse Rota tion Control Solenoid Valve (Fan Valve)

Cut O Solenoid Valve (Joystick Steering Valve)

2-Spool Solenoid Valve Unit (Joystick Steering Sys tem)

Transmission Model TCEC74AD

Axle (Front/Rear) Model Two Stage Reduction

Propeller Shaft Type Cruciform Joint Type

Type ON/OFF Solenoid Valve Rated Voltage 24 V Coil Resistance 30 Ω Type Proportional Solenoid Valve Rated Voltage 24 V Coil Resistance 10.3 Ω Type ON/OFF Solenoid Valve Rated Voltage 24 V Coil Resistance 48 Ω Type 2-Spool Proportional Solenoid Valve Rated Voltage 24 V Coil Resistance 15 Ω Type Proportional Solenoid Valve Rated Voltage 24 V Coil Resistance 22 Ω Type Proportional Solenoid Valve Rated Voltage 24 V Coil Resistance 22.3 Ω Type Solenoid Valve Rated Voltage 24 V Coil Resistance 34±0.5 Ω Type 2-Spool Proportional Solenoid Valve Rated Voltage 24 V Coil Resistance 12±1.0 Ω

Type Counter Shaft Type Gear Ratio Forward First Speed: 3.50

Forward Second Speed: 2.02

Forward Third Speed: 1.06

Forward Fourth Speed: 0.61

Reverse First Speed: 3.50

Reverse Second Speed: 2.02

Reverse Third Speed: 1.06

Reverse Fourth Speed: 0.61 Parking Brake Releasing Pressure 2.8 MPa

Brake Type Wet-Type Multi-Disc Brake Brake Pressure 4.8 MPa Final Reduction Gear Ratio 27.484

Dimension between Pins Main: 157 mm

Front: 1616 mm

Rear: 351 mm

TONFQ50-EN-00(28/02/2022)

T1-3-7

SECTION 1 GENERAL

Group 3 Component Specifications

Cylinder Lift Arm Bucket Steering

Rod Outer Diameter 95 mm 115 mm 60 mm Cylinder Bore 145 mm 180 mm 85 mm Stroke 884 mm 528 mm 498 mm Fully Retracted Length 1481 mm 1292 mm 818 mm Plating Thickness 25 μm 25 μm 25 μm

Electrical Component

Control Lever Voltage/Current 5±0.5 V/Max. 15 mA (PWM Cross Output) Fuel Level Sensor Resistance Value Empty: 90⁺¹⁰₀ Ω、Full: 10⁰₋₄ Ω Battery Relay Voltage/Current 24 V/120 A Starter Relay Voltage 24 V Glow Plug Relay Voltage 24 V Air Filter Restriction Switch Operating Pressure 6.2±0.6 kPa Horn Voltage/Current 24 V/1.5±0.7 A

Sound Pressure 113±5 dB (A) at 2 m

Back Buzzer (Loud) Voltage/Current 24 V、1 A

Sound Pressure 97/107/112 dB (A) at 1.2 m

Illumination Working Light LED 24 V、20 W

Cab Light LED 24 V、17 W/34 W Headlight LED 24 V、17 W/34 W Turn Signal Light 24 V、17.5 W(Front)、21 W(Rear) Clearance Light 24 V、2.7 W License Light 24 V、12 W Tail Light LED 24 V、0.4 W Brake Light LED 24 V、3.8 W

Air Conditioner Refrigerant R134 a

Cooling Capacity 4.65 kW or More

Emergency Steering Pump Unit

Cool Air Volume

Heating Ability 5.81 kW or More Warm Air Volume

Temperature Adjusting System Electronic Type Refrigerant Filling Amount 750±50 g Compressor Oil Quantity

Type Electrical Motor Operated Type Maximum Flow Rate 20 L/min at 8 MPa Electric Motor Voltage 24 V、2.4 kW

550 m3/h or More

400 m3/h or More

160 cm

3

TONFQ50-EN-00(28/02/2022)

T1-3-8

SECTION 2

SYSTEM

CONTENTS

Controller ..................................................T2-1-1

Outline of Controller........................................................... T2-1-1

CAN Circuit............................................................................. T2-1-1

Control System..........................................T2-2-1

Outline of Control System ................................................T2-2-1

Engine Control (ECM)......................................................... T2-2-1

Engine Control System Layout........................................T2-2-2

Engine Protection Control................................................T2-2-3

Accelerator Pedal Control................................................. T2-2-5

Auto Warming-Up Control ...............................................T2-2-7

Engine Torque Idle Speed-Up Control .........................T2-2-9

Forward/Reverse Selection Speed Limit Control

While Traveling..............................................................T2-2-11

Engine Speed Limit Control without Load...............T2-2-14

Matching Control While Digging.................................T2-2-16

Speed Limit Control with Power Mode OFF.............T2-2-19

Auto Power Up Speed Control......................................T2-2-21

Overheat Prevention Speed Limit Control ...............T2-2-24

Aftertreatment Device Manual Regeneration

Control..............................................................................T2-2-26

Engine Over Speed Limit Control ................................T2-2-28

Engine Max. Speed Limit Control at Stroke End

Stall and Front Relief ...................................................T2-2-30

Engine Torque Limit Control During Acceleration..

.............................................................................................T2-2-32

Pump Control......................................................................T2-2-34

Pump Control System Layout........................................T2-2-35

Base Torque Control..........................................................T2-2-36

Torque Decrease Control While Digging...................T2-2-37

Transmission Control (TCU)............................................T2-2-39

Transmission Control System Layout..........................T2-2-40

Neutral Control...................................................................T2-2-41

Forward/Reverse Lever Priority Control.....................T2-2-43

Manual Speed Shift Control...........................................T2-2-45

Automatic Speed Shift Control.....................................T2-2-47

Downshift Control.............................................................T2-2-50

Rise Run Shift Prohibit Control......................................T2-2-52

Clutch Cuto Control........................................................T2-2-54

Shift Holding Control........................................................T2-2-56

Lock Up Control..................................................................T2-2-58

Fan Control, Valve Control ..............................................T2-2-60

Fan Control, Valve Control System Layout................T2-2-61

Fan Speed Control .............................................................T2-2-62

Fan Reverse Rotation Control........................................T2-2-63

Fan Speed Control During Transmission Learning.

.............................................................................................T2-2-66

Front Attachment Operation Circuit Selection

Control..............................................................................T2-2-67

Ride Control.........................................................................T2-2-69

Control by Electrical and Hydraulic Combined

Circuit................................................................................T2-2-71

Bucket Auto Leveler Control..........................................T2-2-72

Lift Arm Float Control.......................................................T2-2-73

Front Loader Device Control..........................................T2-2-75

Outline of Front Attachment Operation Control.....

.............................................................................................T2-2-75

Process of Front Attachment Operation Control.....

.............................................................................................T2-2-76

Front Attachment Failure Detection ...........................T2-2-78

Detent Control....................................................................T2-2-80

3rd/4th Lever Control.......................................................T2-2-82

Control Lever Lock Control.............................................T2-2-83

Other Controls ....................................................................T2-2-85

Transmission Alarm Control...........................................T2-2-85

Parking Brake Operation Indicator Control..............T2-2-86

Brake Oil Low Pressure Indicator Control..................T2-2-87

Low Steering Oil Pressure Indicator Control............T2-2-88

Overrun Alarm Control ....................................................T2-2-89

Lift Arm Auto Leveler Height Kickout Control.........T2-2-91

Lift Arm Auto Leveler Lower Kickout Control..........T2-2-92

Quick Power Mode Control............................................T2-2-94

Auto Shut-Down Control................................................T2-2-95

Emergency Steering Control .........................................T2-2-98

Coolant Level Switch Control .....................................T2-2-100

Payload Checker Control.............................................. T2-2-100

Object Detection Sensor Control.............................. T2-2-101

Process of Object Detection Sensor Control......... T2-2-102

Notication Processing (Leveling)............................ T2-2-103

Scooping Flag ..................................................................T2-2-104

User Interface ................................................................... T2-2-104

Aerial Angle Control.......................................................T2-2-106

JSS Control System......................................................... T2-2-109

Joystick Steering Lever Control ................................. T2-2-109

Forward/Reverse Switch Control (JSS).................... T2-2-111

Alarm Control (JSS)......................................................... T2-2-114

Engine System ..........................................T2-3-1

Outline of ECM System ......................................................T2-3-1

Fuel Injection Control......................................................... T2-3-1

Fuel Injection Amount Control....................................... T2-3-2

TONFQ50-EN-00(28/02/2022)

Fuel Injection Timing Control.......................................... T2-3-3

Fuel Injection Rate Control............................................... T2-3-5

Fuel Injection Pressure Control....................................... T2-3-7

Fuel Injection Amount Correction Control................. T2-3-8

Preheating Control.............................................................. T2-3-9

Alarm Control......................................................................T2-3-10

Urea SCR System................................................................T2-3-11

DEF Injection Control .......................................................T2-3-11

Start-Up Control.................................................................T2-3-12

DEF Defrosting Control....................................................T2-3-13

DEF Thermal Control ........................................................T2-3-14

After-Run Control...............................................................T2-3-15

Engine Output Restriction Control (INDUCEMENT)

.............................................................................................T2-3-16

Insucient DEF Level.......................................................T2-3-17

Malfunction of Urea SCR System..................................T2-3-18

Outline of Aftertreatment Device................................T2-3-19

Operation of Aftertreatment Device...........................T2-3-20

Aftertreatment Device Regeneration Control.........T2-3-21

Hydraulic System......................................T2-4-1

Outline of Hydraulic System ............................................ T2-4-1

Pilot Circuit of Hydraulic System.................................... T2-4-1

Charging Circuit ...................................................................T2-4-3

Charging Circuit (Outline)................................................. T2-4-3

Charging Circuit (When service brake is not

stepped)............................................................................. T2-4-4

Charging Circuit (When service brake is stepped)..

............................................................................................... T2-4-6

Service Brake Circuit ...........................................................T2-4-7

Service Brake Circuit (When brake is applied)........... T2-4-7

Service Brake Circuit (When brake is released) .........T2-4-8

Parking Brake Circuit...........................................................T2-4-8

Parking Brake Circuit (Outline)........................................ T2-4-9

Parking Brake Circuit (When parking brake is

applied).............................................................................. T2-4-9

Parking Brake Circuit (When parking brake is

released) ..........................................................................T2-4-10

Lift Arm/Bucket Operation Control Circuit...............T2-4-11

Lift Arm/Bucket Operation Control Circuit

(Outline)...........................................................................T2-4-11

Fan Circuit.............................................................................T2-4-12

Fan Reverse Rotation Control Circuit..........................T2-4-13

Fan Speed Control Circuit...............................................T2-4-14

Fan Circuit (Prevention of Cavitation).........................T2-4-15

Ride Control Circuit...........................................................T2-4-16

Main Circuit of Hydraulic System.................................T2-4-17

Main Circuit of Hydraulic System (Outline) ..............T2-4-18

Steering Priority Circuit....................................................T2-4-19

Steering Priority Circuit (When not Operated)........T2-4-19

Steering Priority Circuit (When Operated)................T2-4-20

Steering Operation Control Circuit..............................T2-4-22

Steering Operation Control Circuit (Outline)...........T2-4-22

Steering Operation Control Circuit (Steering

Operation).......................................................................T2-4-23

Steering Operation Control Circuit (Steering Stop

Operation).......................................................................T2-4-25

Front Attachment Control Circuit ................................T2-4-26

Neutral Circuit.....................................................................T2-4-27

Flow Rate Control Circuit................................................T2-4-28

Relief Circuit.........................................................................T2-4-29

Single Operation Circuit..................................................T2-4-30

Combined Operation Circuit (Combined

Operation of Lift Arm Raise and Bucket Dump).

.............................................................................................T2-4-31

Combined Operation Circuit (Combined

Operation of Steering and Lift Arm Raise) ..........T2-4-33

Pump Control Circuit........................................................T2-4-35

Parallel Circuit Flow Rate Control.................................T2-4-37

Emergency Steering Circuit ...........................................T2-4-38

Outline of JSS Hydraulic System...................................T2-4-40

Pilot Circuit of JSS Hydraulic System...........................T2-4-41

Joystick Steering Operation Control Circuit.............T2-4-41

Joystick Steering Operation (When Operating

Steering Wheel).............................................................T2-4-43

Electrical System.......................................T2-5-1

Outline of Electrical System .............................................T2-5-1

Main Circuit of Electrical System.................................... T2-5-1

Electric Power Circuit (Key Switch: OFF)......................T2-5-1

CAN Circuit............................................................................. T2-5-3

Accessory Related Circuits (Key Switch: ACC)............ T2-5-6

Starting Circuit (Key Switch: START)..............................T2-5-7

Charging Circuit (Key Switch: ON) ................................. T2-5-8

Surge Voltage Prevention Circuit................................... T2-5-9

Control Lever Lock Circuit (Key Switch: ON).............T2-5-10

Auto Shut-down Circuit...................................................T2-5-12

Engine Stop Circuit............................................................T2-5-14

Air Conditioner Circuit .....................................................T2-5-15

Column Box Circuit............................................................T2-5-16

Headlight Circuit (Clearance Light, License Light,

Tail Light Circuit (Light Switch: Clearance Light

Position))..........................................................................T2-5-16

Headlight Circuit (Dimmer Switch: Low Beam

Position)...........................................................................T2-5-18

High Beam Circuit..............................................................T2-5-20

Hazard Light Circuit (Key Switch: OFF).......................T2-5-21

Turn Signal Light Circuit..................................................T2-5-23

Horn Circuit (Key Switch: OFF) ......................................T2-5-24

Back Buzzer Circuit............................................................T2-5-24

Brake Light Circuit .............................................................T2-5-25

Parking Brake Circuit (Parking Brake: Released

(Parking Switch: Release Position))........................T2-5-26

Parking Brake Circuit (Parking Brake: Applied

(Parking Switch: Apply Position).............................T2-5-27

Accessory Circuit of Electrical System........................T2-5-28

Work Light Circuit..............................................................T2-5-28

Front Wiper Circuit ............................................................T2-5-29

Rear Wiper Circuit..............................................................T2-5-31

Washer Circuit.....................................................................T2-5-32

Cab Light Circuit.................................................................T2-5-33

TONFQ50-EN-00(28/02/2022)

SECTION 2 SYSTEM

Group 1 Controller

Outline of Controller

The following controllers are provided in this machine in order to control the functions. Each controller excluding the communication controller communicates by using the CAN circuit and sends or receives the required signal.

Controller Control Comment on

Control MC MC controls the engine speed, pumps, and valves. T2-2 PLCU PLCU controls valves such as the control valve solenoid valve and the

control lever pilot shut-o solenoid valve. PLCU also controls the joy

stick steering system. TCU TCU controls the transmission. T2-2 ECM ECM controls the engine. T2-3 Monitor Controller The monitor controller displays the operating information and alarms

on the sub monitor. Column Display The column display shows gauges and indicators. T2-5 Air Conditioner Controller The air conditioner controller controls the air conditioner. T2-5, T5-7 Aerial Angle Controller The aerial angle controller controls the composition/display switching

of camera images. Communication Controller The communication controller sends the mails and operating informa

tion.

T2-2

T5-2

T2-2

T5-3

NOTE

Refer to the corresponding group for details of each controller control.

CAN Circuit

CAN (Controller Area Network) is ISO Standards of the serial communication protocol. This machine has seven networks (CAN bus (4)) that consist of Power-CAN, Body-CAN, Local-CAN, IF-CAN, PL-CAN, OPTCAN, and SENSOR-CAN, which are mainly used for the following controls.

Power-CAN Engine and transmission Body-CAN Accessories Local-CAN Engine IF-CAN Communication PL-CAN Safety OPT-CAN SENSOR-CAN Sensors

CAN bus (4) consists of two wire harnesses, CAN-H (High) (2) and CAN-L (Low) (3). Each controller judges the CAN bus (4) level due to the potential dierence between CAN-H (High) (2) and CAN-L (Low) (3). Each controller arranges the CAN bus (4) level for sending the signal and data to other controllers. Termination resistors (120 Ω) (17) are installed to the both ends of CAN bus (4).

TONFQ50-EN-00(28/02/2022)

T2-1-1

22

23

24

21

7

ECM

8

MC

17

Local-CAN

SENSOR-CAN

Power-CAN

18

17

20

9

GSM/

GPS

11

MPDr.

IF-CAN

17

10

15

16

17

32

13

3130

26

6

5

17

14

A/C

25

PLCU

1

TCU

12

OPT-CAN

Body-CAN

PL-CAN

17

4

2

3

SECTION 2 SYSTEM

Group 1 Controller

1- TCU 2- CAN-H (High) 3- CAN-L (Low) 4- CAN Bus 5- Panel Switch 1 6- Panel Switch 2 7- ECM (Engine Controller) 8- MC (Main Controller) 9- Communication Controller

10- Monitor Controller 11- MPDr. 12- Aerial Angle Controller 13- Column Display 14- Air Conditioner Controller 15- Monitor Control Unit 16- Information Control Unit 17- Terminal Resistor (120 Ω) 18- Position Sensor

20- Object Detection Sensor 21- DEF Sensor Unit 22- SCR Inlet Exhaust Tempera

ture Sensor, SCR Outlet Ex haust Temperature Sensor, DOC Inlet Exhaust Tempera ture Sensor, DOC Outlet Ex haust Temperature Sensor

23- Upstream NOx Sensor

24- Downstream NOx Sensor 25- PLCU 26- Rotary Device 30- Option Connector 1 31- Option Connector 2 32- Option Connector 3

TNFQ-02-01-001-1 ja

TONFQ50-EN-00(28/02/2022)

T2-1-2

SECTION 2 SYSTEM

Group 2 Control System

Outline of Control System

MC and PLCU are used in order to control the machine operations. The signals from the accelerator pedal sensor, various sensors, switches, and TCU are sent to MC and PCLU, and processed in the logic circuit. MC and PCLU send the signal equivalent to the target engine speed to ECM by using CAN communication in order to control the engine. (Refer to SYSTEM/Engine System.) In addition, MC and PLCU drive the solenoid valve unit and the torque control solenoid valve in order to control the pumps and valves. TCU is used in order to control the machine travel operations. The signals from the shift switch, forward/reverse lever, various switches, and various sensors of transmission are sent to TCU and processed in the logic circuit. TCU activates the forward and reverse clutch solenoid valves and speed shift solenoid valve, and controls the transmission.

Engine Control (ECM)

The engine control consists of the followings.

● Engine Protection Control

● Accelerator Pedal Control

● Auto Warming-Up Control

● Engine Torque Idle Speed-Up Control

● Forward/Reverse Selection Speed Limit Control While Traveling

● Engine Speed Limit Control without Load

● Matching Control While Digging

● Speed Limit Control with Power Mode OFF

● Auto Power Up Speed Control

● Overheat Prevention Speed Limit Control

● Aftertreatment Device Manual Regeneration Control

● Engine Overload Prevention Control

● Engine Max. Speed Limit Control at Stroke End Stall and Front Relief

● Engine Torque Limit Control During Acceleration

TONFQ50-EN-00(28/02/2022)

T2-2-1

Engine Control System Layout

2

1

83

75

5251 5355 54

32

33 34 35 88

36

33 34 35

48

31

69

71 72

80

73

70

84

86

20

37

43

15

14

74

17

63

3

MC

19

18

60

16

44

7

TCU

9

PLCU

4

5

ECM

13

11

10

64

46

21

38

25

24

23

22

26

27

29

28

30

6

8

41

47

SECTION 2 SYSTEM

Group 2 Control System

1- Accelerator Pedal 2- Accelerator Pedal Sensor 3- MC 4- Monitor Controller 5- ECM 6- Engine 7- TCU 8- Transmission 9- PLCU 10- Main Monitor 11- Column Display 13- Control Lever 14- Rotary Device 15- Panel Switch 1 16- Panel Switch 2 17- Power-CAN 18- Body-CAN 19- PL-CAN 20- SENSOR-CAN

21- IF-CAN 22- Boost Temperature Sensor 23- Crank Speed Sensor 24- Cam Angle Sensor 25- Coolant Temperature Sensor 26- Torque Converter Oil Temper

ature Sensor

27- Torque Converter Input Shaft

Speed Sensor

28- Torque Converter Output

29- Transmission Intermediate

30- Vehicle Speed Sensor 31- Shift Switch 32- Forward/Reverse Lever 33- Forward Position 34- Neutral Position 35- Reverse Position

Shaft Speed Sensor

36- Forward/Reverse Switch 37- Forward/Reverse Selector

Switch

38- Pump Delivery Pressure Sen

sor 41- Parking Brake Pressure Sensor 43- Clutch Cut-o Position Switch 44- Power Mode Switch 46- Sub Monitor 47- Key Switch 48- Hydraulic Oil Temperature

Sensor 51- Brake Pedal (Left) 52- Service Brake Secondary Pres

sure Sensor 53- Brake Pedal (Right) 54- Brake Pedal (Right) Switch 55- Brake Pedal Position Sensor 60- Manual Regeneration Switch

TNFQ-02-02-001-1 ja

63- Aftertreatment Device Regen

eration Signal 64- MPDr. 69- Lift Arm Angle Sensor 70- Bucket Angle Sensor 71- Axle Oil Temperature Sensor 72- Lift Arm Rod Pressure Sensor 73- Lift Arm Bottom Pressure Sen

sor 74- Position Sensor 75- Control Lever Lock Switch 80- Downshift Switch 83- Primary Pilot Pressure Sensor 84- Service Brake Primary Pres

sure Sensor 86- Object Detection Sensor 88- Joystick Steering Selector

Switch

TONFQ50-EN-00(28/02/2022)

T2-2-2

A

E

F

B

DC

SECTION 2 SYSTEM

Group 2 Control System

Engine Protection Control

Purpose:

The engine protection control controls increasing the engine speed and promotes the circulation of the engine oil immediately after the engine starts. Therefore, the engine (turbocharger) is protected from being damaged.

TNED-02-02-065-1 ja

A- Engine Speed D- Accelerator Pedal Depressing Amount: Fully Depressed B- Accelerator Pedal Depressing Amount: E- Maximum Rotation Speed C- Accelerator Pedal Depressing Amount: Not Operated F- Minimum Rotation Speed

Operation:

1. When the engine starts, MC (3) receives the signals from coolant temperature sensor (25), hydraulic oil temperature sensor (48), and torque converter oil temperature sensor (26). MC (3) sends the signal equivalent to the target engine speed according to the received signals to ECM (5) by using CAN communication (17).

2. ECM (5) sets the engine speed to minimum rotation speed (F) and holds it for 3 to 40 seconds.

3. When the engine starts and the specied time is passed, MC (3) deactivates the engine protection control.

4. ECM (5) slowly returns the engine speed to the speed according to other engine controls.

NOTE

The priority is given to the engine protection control. Therefore, the engine speed does not change even if the accelerator pedal is operated when the engine protection control is activated. Other controls are activated after the engine protection control is deactivated.

TONFQ50-EN-00(28/02/2022)

T2-2-3

2

1

83

75

5251 5355 54

32

33 34 35 88

36

33 34 35

48

31

69

71 72

80

73

70

84

86

20

37

43

15

14

74

17

63

3

MC

19

18

60

16

44

7

TCU

9

PLCU

4

5

ECM

13

11

10

64

46

21

38

25

24

23

22

26

27

29

28

30

6

8

41

47

SECTION 2 SYSTEM

Group 2 Control System

1- Accelerator Pedal 2- Accelerator Pedal Sensor 3- MC 4- Monitor Controller 5- ECM 6- Engine 7- TCU 8- Transmission 9- PLCU 10- Main Monitor 11- Column Display 13- Control Lever 14- Rotary Device 15- Panel Switch 1 16- Panel Switch 2 17- Power-CAN 18- Body-CAN 19- PL-CAN 20- SENSOR-CAN

21- IF-CAN 22- Boost Temperature Sensor 23- Crank Speed Sensor 24- Cam Angle Sensor 25- Coolant Temperature Sensor 26- Torque Converter Oil Temper

27- Torque Converter Input Shaft

28- Torque Converter Output

29- Transmission Intermediate

30- Vehicle Speed Sensor 31- Shift Switch 32- Forward/Reverse Lever 33- Forward Position 34- Neutral Position 35- Reverse Position

ature Sensor

Speed Sensor

Shaft Speed Sensor

36- Forward/Reverse Switch 37- Forward/Reverse Selector

Switch

38- Pump Delivery Pressure Sen

sor 41- Parking Brake Pressure Sensor 43- Clutch Cut-o Position Switch 44- Power Mode Switch 46- Sub Monitor 47- Key Switch 48- Hydraulic Oil Temperature

Sensor 51- Brake Pedal (Left) 52- Service Brake Secondary Pres

sure Sensor 53- Brake Pedal (Right) 54- Brake Pedal (Right) Switch 55- Brake Pedal Position Sensor 60- Manual Regeneration Switch

TNFQ-02-02-002-1 ja

63- Aftertreatment Device Regen

eration Signal 64- MPDr. 69- Lift Arm Angle Sensor 70- Bucket Angle Sensor 71- Axle Oil Temperature Sensor 72- Lift Arm Rod Pressure Sensor 73- Lift Arm Bottom Pressure Sen

sor 74- Position Sensor 75- Control Lever Lock Switch 80- Downshift Switch 83- Primary Pilot Pressure Sensor 84- Service Brake Primary Pres

sure Sensor 86- Object Detection Sensor 88- Joystick Steering Selector

Switch

TONFQ50-EN-00(28/02/2022)

T2-2-4

A

E

F

G

B

DC

SECTION 2 SYSTEM

Group 2 Control System

Accelerator Pedal Control

Purpose:

The accelerator pedal control controls the engine speed according to the depressing amount of accelerator pedal (1).

TNED-02-02-002-1 ja

A- Engine Speed E- Maximum Rotation Speed B- Accelerator Pedal Depressing Amount

C- Accelerator Pedal Depressing Amount: Not Operated G- Minimum Rotation Speed D- Accelerator Pedal Depressing Amount: Fully Depressed

F- Specied Value (1100 min-1)

Operation:

1. PLCU (9) receives the signals (the demand engine speed) from accelerator pedal sensor (2) and sends them to MC (3) by using CAN communication (17). MC (3) sends the signal equivalent to the target engine speed according to the received signals to ECM (5) by using CAN communication (17).

2. ECM (5) controls the engine speed according to CAN communication (17).

3. When accelerator pedal sensor (2) becomes abnormal, MC (3) sends the backup signals to ECM (5).

4. ECM (5) limits the engine speed to specied value (F). (Backup Control).

Deactivation of Backup Control:

1. When accelerator pedal sensor (2) becomes normal, MC (3) deactivates the backup control by the following procedure.

• Turn OFF key switch (47)

• Wait more than 10 second.

• Turn ON key switch (47)

2. Therefore, ECM (5) returns the engine speed according to the accelerator pedal control.

TONFQ50-EN-00(28/02/2022)

T2-2-5

2

1

83

75

5251 5355 54

32

33 34 35 88

36

33 34 35

48

31

69

71 72

80

73

70

84

86

20

37

43

15

14

74

17

63

3

MC

19

18

60

16

44

7

TCU

9

PLCU

4

5

ECM

13

11

10

64

46

21

38

25

24

23

22

26

27

29

28

30

6

8

41

47

SECTION 2 SYSTEM

Group 2 Control System

1- Accelerator Pedal 2- Accelerator Pedal Sensor 3- MC 4- Monitor Controller 5- ECM 6- Engine 7- TCU 8- Transmission 9- PLCU 10- Main Monitor 11- Column Display 13- Control Lever 14- Rotary Device 15- Panel Switch 1 16- Panel Switch 2 17- Power-CAN 18- Body-CAN 19- PL-CAN 20- SENSOR-CAN

21- IF-CAN 22- Boost Temperature Sensor 23- Crank Speed Sensor 24- Cam Angle Sensor 25- Coolant Temperature Sensor 26- Torque Converter Oil Temper

27- Torque Converter Input Shaft

28- Torque Converter Output

29- Transmission Intermediate

30- Vehicle Speed Sensor 31- Shift Switch 32- Forward/Reverse Lever 33- Forward Position 34- Neutral Position 35- Reverse Position

ature Sensor

Speed Sensor

Shaft Speed Sensor

36- Forward/Reverse Switch 37- Forward/Reverse Selector

Switch

38- Pump Delivery Pressure Sen

sor 41- Parking Brake Pressure Sensor 43- Clutch Cut-o Position Switch 44- Power Mode Switch 46- Sub Monitor 47- Key Switch 48- Hydraulic Oil Temperature

Sensor 51- Brake Pedal (Left) 52- Service Brake Secondary Pres

sure Sensor 53- Brake Pedal (Right) 54- Brake Pedal (Right) Switch 55- Brake Pedal Position Sensor 60- Manual Regeneration Switch

TNFQ-02-02-003-1 ja

63- Aftertreatment Device Regen

eration Signal 64- MPDr. 69- Lift Arm Angle Sensor 70- Bucket Angle Sensor 71- Axle Oil Temperature Sensor 72- Lift Arm Rod Pressure Sensor 73- Lift Arm Bottom Pressure Sen

sor 74- Position Sensor 75- Control Lever Lock Switch 80- Downshift Switch 83- Primary Pilot Pressure Sensor 84- Service Brake Primary Pres

sure Sensor 86- Object Detection Sensor 88- Joystick Steering Selector

Switch

TONFQ50-EN-00(28/02/2022)

T2-2-6

A

C

D

E

B

SECTION 2 SYSTEM

Group 2 Control System

Auto Warming-Up Control

Purpose:

The auto warming-up control automatically warms up the engine.

A- Engine Speed D- Auto Warming-Up Speed B- Target Engine Speed E- Minimum Rotation Speed C- Maximum Rotation Speed

TNED-02-02-004-1 ja

Operation:

1. MC (3) receives the signal from hydraulic oil temperature sensor (48) and coolant temperature sensor (25).

2. When any of the following conditions exists, MC (3) sends the signals equivalent to the target engine speed to ECM (5) by using CAN communication (17).

• When key switch (47) is in the ON position and hydraulic oil temperature is 0 °C or lower

• When key switch (47) is in the START position and hydraulic oil temperature is 0 °C or lower

3. ECM (5) increases the engine speed to auto warming-up speed (D).

4. When any of the following conditions exist, MC (3) deactivates the auto warming-up control.

• When 30 minutes passed after setting key switch (47) to START position

• Hydraulic oil temperature: 30 °C or more

• Coolant Temperature: 40 °C or more

• Parking Brake: UNLOCK

5. Therefore, ECM (5) returns the engine speed according to the accelerator pedal control.

NOTE

"Normal" or "Ultra Low Temperature" can be set as follows by using MPDr. (64).

Normal Ultra Low Temperature

Auto Warming-Up Speed

Hydraulic Oil Temperature Non-activation 30 °C 40 °C Coolant Temperature Non-activation 40 °C 50 °C

1000 (min-1) 1100 (min-1)

IMPORTANT

When adjusting the auto-idle speed, deactivate the auto warming-up control by using sub monitor (46). Or wait the adjustment until 30 minutes after the engine starts.

TONFQ50-EN-00(28/02/2022)

T2-2-7

2

1

83

75

5251 5355 54

32

33 34 35 88

36

33 34 35

48

31

69

71 72

80

73

70

84

86

20

37

43

15

14

74

17

63

3

MC

19

18

60

16

44

7

TCU

9

PLCU

4

5

ECM

13

11

10

64

46

21

38

25

24

23

22

26

27

29

28

30

6

8

41

47

SECTION 2 SYSTEM

Group 2 Control System

1- Accelerator Pedal 2- Accelerator Pedal Sensor 3- MC 4- Monitor Controller 5- ECM 6- Engine 7- TCU 8- Transmission 9- PLCU 10- Main Monitor 11- Column Display 13- Control Lever 14- Rotary Device 15- Panel Switch 1 16- Panel Switch 2 17- Power-CAN 18- Body-CAN 19- PL-CAN 20- SENSOR-CAN

21- IF-CAN 22- Boost Temperature Sensor 23- Crank Speed Sensor 24- Cam Angle Sensor 25- Coolant Temperature Sensor 26- Torque Converter Oil Temper

27- Torque Converter Input Shaft

28- Torque Converter Output

29- Transmission Intermediate

30- Vehicle Speed Sensor 31- Shift Switch 32- Forward/Reverse Lever 33- Forward Position 34- Neutral Position 35- Reverse Position

ature Sensor

Speed Sensor

Shaft Speed Sensor

36- Forward/Reverse Switch 37- Forward/Reverse Selector

Switch

38- Pump Delivery Pressure Sen

sor 41- Parking Brake Pressure Sensor 43- Clutch Cut-o Position Switch 44- Power Mode Switch 46- Sub Monitor 47- Key Switch 48- Hydraulic Oil Temperature

Sensor 51- Brake Pedal (Left) 52- Service Brake Secondary Pres

sure Sensor 53- Brake Pedal (Right) 54- Brake Pedal (Right) Switch 55- Brake Pedal Position Sensor 60- Manual Regeneration Switch

TNFQ-02-02-004-1 ja

63- Aftertreatment Device Regen

eration Signal 64- MPDr. 69- Lift Arm Angle Sensor 70- Bucket Angle Sensor 71- Axle Oil Temperature Sensor 72- Lift Arm Rod Pressure Sensor 73- Lift Arm Bottom Pressure Sen

sor 74- Position Sensor 75- Control Lever Lock Switch 80- Downshift Switch 83- Primary Pilot Pressure Sensor 84- Service Brake Primary Pres

sure Sensor 86- Object Detection Sensor 88- Joystick Steering Selector

Switch

TONFQ50-EN-00(28/02/2022)

T2-2-8

A

E

F

G

B

DC

SECTION 2 SYSTEM

Group 2 Control System

Engine Torque Idle Speed-Up Control

Purpose:

In case the engine speed is slow and the engine load is large, the engine torque idle speed-up control increases the engine speed in order to prevent the engine stall.

TNED-02-02-006-1 ja

A- Engine Speed E- Maximum Rotation Speed B- Accelerator Pedal Depressing Amount

F- Engine Torque Idle Speed-Up Speed (Max. 1150 min-1) C- Accelerator Pedal Depressing Amount: Not Operated G- Minimum Rotation Speed D- Accelerator Pedal Depressing Amount: Fully Depressed

Operation:

NOTE

The time when forward/reverse switch (36) is eective is explained as an example.

1. PLCU (9) receives the signals from accelerator pedal sensor (2), forward/reverse lever (32) or forward/reverse switch (36), and sends them to TCU (7) by using CAN communication (17). TCU (7) sends the signals to MC (3) by using CAN communication (17).

2. When all following conditions exist, MC (3) sends the signal equivalent to the target engine speed to ECM (5) by using CAN communication (17).

• Forward/Reverse Lever (32) or Forward/Reverse Switch (36): Forward Position (33) or Reverse Position (35)

• Vehicle Speed: less than 20 km/h

• Accelerator Pedal (1) Depressing Amount: Lightly (Engine Speed: less than 1150 min-1)

• Engine Torque: over specied value (Reference: over 20 %)

3. ECM (5) increases the engine speed to engine torque idle speed-up speed (F).

NOTE

Forward/reverse switch (36) is also equipped on machines mounted with the joystick steering system. Forward/reverse switch (36) on the joystick steering system side is shifted between operable and inoperable by the joystick steering selector switch (88).

TONFQ50-EN-00(28/02/2022)

T2-2-9

2

1

83

75

5251 5355 54

32

33 34 35 88

36

33 34 35

48

31

69

71 72

80

73

70

84

86

20

37

43

15

14

74

17

63

3

MC

19

18

60

16

44

7

TCU

9

PLCU

4

5

ECM

13

11

10

64

46

21

38

25

24

23

22

26

27

29

28

30

6

8

41

47

SECTION 2 SYSTEM

Group 2 Control System

1- Accelerator Pedal 2- Accelerator Pedal Sensor 3- MC 4- Monitor Controller 5- ECM 6- Engine 7- TCU 8- Transmission 9- PLCU 10- Main Monitor 11- Column Display 13- Control Lever 14- Rotary Device 15- Panel Switch 1 16- Panel Switch 2 17- Power-CAN 18- Body-CAN 19- PL-CAN 20- SENSOR-CAN

21- IF-CAN 22- Boost Temperature Sensor 23- Crank Speed Sensor 24- Cam Angle Sensor 25- Coolant Temperature Sensor 26- Torque Converter Oil Temper

27- Torque Converter Input Shaft

28- Torque Converter Output

29- Transmission Intermediate

30- Vehicle Speed Sensor 31- Shift Switch 32- Forward/Reverse Lever 33- Forward Position 34- Neutral Position 35- Reverse Position

ature Sensor

Speed Sensor

Shaft Speed Sensor

36- Forward/Reverse Switch 37- Forward/Reverse Selector

Switch

38- Pump Delivery Pressure Sen

sor 41- Parking Brake Pressure Sensor 43- Clutch Cut-o Position Switch 44- Power Mode Switch 46- Sub Monitor 47- Key Switch 48- Hydraulic Oil Temperature

Sensor 51- Brake Pedal (Left) 52- Service Brake Secondary Pres

sure Sensor 53- Brake Pedal (Right) 54- Brake Pedal (Right) Switch 55- Brake Pedal Position Sensor 60- Manual Regeneration Switch

TNFQ-02-02-005-1 ja

63- Aftertreatment Device Regen

eration Signal 64- MPDr. 69- Lift Arm Angle Sensor 70- Bucket Angle Sensor 71- Axle Oil Temperature Sensor 72- Lift Arm Rod Pressure Sensor 73- Lift Arm Bottom Pressure Sen

sor 74- Position Sensor 75- Control Lever Lock Switch 80- Downshift Switch 83- Primary Pilot Pressure Sensor 84- Service Brake Primary Pres

sure Sensor 86- Object Detection Sensor 88- Joystick Steering Selector

Switch

TONFQ50-EN-00(28/02/2022)

T2-2-10

A

B

D

C

G

F

E

A

B

D

C

G

E

H

J

L

M

SECTION 2 SYSTEM

Group 2 Control System

Forward/Reverse Selection Speed Limit Control While Traveling

Purpose:

The forward/reverse selection speed limit control while traveling limits the engine speed when shifting the travel direction. Shock and drift amount of the vehicle are reduced when shifting the travel direction by slowdown function of the engine brake.

Mode 1

TNED-02-02-009-1 ja

A- Engine Speed E- Maximum Rotation Speed B- Accelerator Pedal Depressing Amount

F- Specied Value (1300 min-1) C- Accelerator Pedal Depressing Amount: Not Operated G- Minimum Rotation Speed D- Accelerator Pedal Depressing Amount: Fully Depressed

Mode 2

TNUD-02-02-007-1 ja

A- Engine Speed G- Minimum Rotation Speed B- Accelerator Pedal Depressing Amount H- Specied Value (Other Than Command 1st Speed) (1750

min-1) C- Accelerator Pedal Depressing Amount: Not Operated J- Specied Value (Other Than Command 1st Speed) (1650

min-1) D- Accelerator Pedal Depressing Amount: Fully Depressed

E- Maximum Rotation Speed

Operation:

NOTE

The time when forward/reverse switch (36) is eective is explained as an example.

L- Specied Value (Command 1st Speed) (1750 min-1)

M- Specied Value (Command 1st Speed) (1650 min-1)

TONFQ50-EN-00(28/02/2022)

T2-2-11

SECTION 2 SYSTEM

Group 2 Control System

1. PLCU (9) receives the signals from forward/reverse lever (32) and forward/reverse switch (36), and sends the FNR command signal to TCU (7) and MC (3) by using CAN communication (17).

2. MC (3) sends the speed shift signal from shift switch (31) to TCU (7). TCU (7) sends the vehicle speed signal, transmission speed shift signal, and current FNR command signal to MC (3) by using CAN communication (17).

3. When all following conditions exist, MC (3) sends the signal equivalent to the target engine speed to ECM (5) by using CAN communication (17).

• Forward/Reverse Lever (32) or Forward/Reverse Switch (36): Forward Position (33) or Reverse Position (35)

• Vehicle Speed: over 3.5 km/h

4. ECM (5) reduces and limits the engine speed to specied values (mode 1 or mode 2) according to the CAN signal. Mode 1: When the current FNR command signal of TCU (7) and the FNR command signal of MC (3) do not match, the

engine speed is controlled to specied value (F). Mode 2: When the current FNR command signal of TCU (7) and the FNR command signal of MC (3) match, the engine

speed is controlled to specied value (H) or (L), and then further to specied value (J) or (M).

Deactivation:

NOTE

The time when forward/reverse switch (36) is eective is explained as an example.

1. When of the any following conditions exists, ECM (5) returns the engine speed according to the accelerator pedal control.

• Vehicle Speed: less than 3.5 km/h

• Forward/Reverse Lever (32) and Forward/Reverse Switch (36): Neutral Position (34)

NOTE

Forward/reverse switch (36) is also equipped on machines mounted with the joystick steering system. Forward/reverse switch (36) on the joystick steering system side is shifted between operable and inoperable by the joystick steering selector switch (88).

TONFQ50-EN-00(28/02/2022)

T2-2-12

2

1

83

75

5251 5355 54

32

33 34 35 88

36

33 34 35

48

31

69

71 72

80

73

70

84

86

20

37

43

15

14

74

17

63

3

MC

19

18

60

16

44

7

TCU

9

PLCU

4

5

ECM

13

11

10

64

46

21

38

25

24

23

22

26

27

29

28

30

6

8

41

47

SECTION 2 SYSTEM

Group 2 Control System

1- Accelerator Pedal 2- Accelerator Pedal Sensor 3- MC 4- Monitor Controller 5- ECM 6- Engine 7- TCU 8- Transmission 9- PLCU 10- Main Monitor 11- Column Display 13- Control Lever 14- Rotary Device 15- Panel Switch 1 16- Panel Switch 2 17- Power-CAN 18- Body-CAN 19- PL-CAN 20- SENSOR-CAN

21- IF-CAN 22- Boost Temperature Sensor 23- Crank Speed Sensor 24- Cam Angle Sensor 25- Coolant Temperature Sensor 26- Torque Converter Oil Temper

27- Torque Converter Input Shaft

28- Torque Converter Output

29- Transmission Intermediate

30- Vehicle Speed Sensor 31- Shift Switch 32- Forward/Reverse Lever 33- Forward Position 34- Neutral Position 35- Reverse Position

ature Sensor

Speed Sensor

Shaft Speed Sensor

36- Forward/Reverse Switch 37- Forward/Reverse Selector

Switch

38- Pump Delivery Pressure Sen

sor 41- Parking Brake Pressure Sensor 43- Clutch Cut-o Position Switch 44- Power Mode Switch 46- Sub Monitor 47- Key Switch 48- Hydraulic Oil Temperature

Sensor 51- Brake Pedal (Left) 52- Service Brake Secondary Pres

sure Sensor 53- Brake Pedal (Right) 54- Brake Pedal (Right) Switch 55- Brake Pedal Position Sensor 60- Manual Regeneration Switch

TNFQ-02-02-008-1 ja

63- Aftertreatment Device Regen

eration Signal 64- MPDr. 69- Lift Arm Angle Sensor 70- Bucket Angle Sensor 71- Axle Oil Temperature Sensor 72- Lift Arm Rod Pressure Sensor 73- Lift Arm Bottom Pressure Sen

sor 74- Position Sensor 75- Control Lever Lock Switch 80- Downshift Switch 83- Primary Pilot Pressure Sensor 84- Service Brake Primary Pres

sure Sensor 86- Object Detection Sensor 88- Joystick Steering Selector

Switch

TONFQ50-EN-00(28/02/2022)

T2-2-13

A

E

F

G

H

B

C

SECTION 2 SYSTEM

Group 2 Control System

Engine Speed Limit Control without Load

Purpose:

The engine speed limit control without load limits the maximum engine speed of the engine when the pump delivery pressure is less than specied value. Therefore, fuel consumption is reduced.

TNUD-02-02-009-1 ja

A- Engine Speed B- Accelerator Pedal Depressing Amount G- Minimum Rotation Speed

C- Accelerator Pedal Depressing Amount: Not Operated H- Accelerator Pedal Depressing Amount: Fully Depressed E- Maximum Rotation Speed

Operation:

F- Specied Value (2080 min-1)

NOTE

The time when forward/reverse switch (36) is eective is explained as an example.

1. MC (3) receives the signal from the pump delivery pressure sensor (38).

2. When all following conditions exist, MC (3) sends the signal equivalent to the target engine speed to ECM (5) by using CAN communication (17).

• Pump Delivery Pressure: less than specied value (Reference: Less than 11 MPa)

• Forward/Reverse Lever (32) and Forward/Reverse Switch (36): Neutral Position (34)

• Vehicle Speed: less than 2 km/h

3. ECM (5) sets the engine speed to specied value (F) according to CAN communication (17).

Deactivation:

NOTE

The time when forward/reverse switch (36) is eective is explained as an example.

1. When any of the following conditions exists, ECM (5) returns the engine speed according to the accelerator pedal control.

• Pump Delivery Pressure: High Pressure (Reference: 11 MPa or more)

• Forward/Reverse Lever (32) or Forward/Reverse Switch (36): Forward Position (33) or Reverse Position (35)

• Vehicle Speed: 2 km/h or more

NOTE

In case performing the lift arm raise/lower operation with the bucket empty, pump delivery pressure becomes medium pressure (3 to 14 MPa).

TONFQ50-EN-00(28/02/2022)

T2-2-14

2

1

83

75

5251 5355 54

32

33 34 35 88

36

33 34 35

48

31

69

71 72

80

73

70

84

86

20

37

43

15

14

74

17

63

3

MC

19

18

60

16

44

7

TCU

9

PLCU

4

5

ECM

13

11

10

64

46

21

38

25

24

23

22

26

27

29

28

30

6

8

41

47

SECTION 2 SYSTEM

Group 2 Control System

NOTE

Forward/reverse switch (36) is also equipped on machines mounted with the joystick steering system. Forward/reverse switch (36) on the joystick steering system side is shifted between operable and inoperable by the joystick steering selector switch (88).

TNFQ-02-02-010-1 ja

TONFQ50-EN-00(28/02/2022)

T2-2-15

A

B

E F G HD

J

K

L

M

SECTION 2 SYSTEM

Group 2 Control System

1- Accelerator Pedal 2- Accelerator Pedal Sensor 3- MC 4- Monitor Controller 5- ECM 6- Engine 7- TCU 8- Transmission 9- PLCU 10- Main Monitor 11- Column Display 13- Control Lever 14- Rotary Device 15- Panel Switch 1 16- Panel Switch 2 17- Power-CAN 18- Body-CAN 19- PL-CAN 20- SENSOR-CAN

21- IF-CAN 22- Boost Temperature Sensor 23- Crank Speed Sensor 24- Cam Angle Sensor 25- Coolant Temperature Sensor 26- Torque Converter Oil Temper

ature Sensor

27- Torque Converter Input Shaft

Speed Sensor

28- Torque Converter Output

Shaft Speed Sensor

29- Transmission Intermediate

Shaft Speed Sensor 30- Vehicle Speed Sensor 31- Shift Switch 32- Forward/Reverse Lever 33- Forward Position 34- Neutral Position 35- Reverse Position

36- Forward/Reverse Switch 37- Forward/Reverse Selector

Switch

38- Pump Delivery Pressure Sen

sor 41- Parking Brake Pressure Sensor 43- Clutch Cut-o Position Switch 44- Power Mode Switch 46- Sub Monitor 47- Key Switch 48- Hydraulic Oil Temperature

Sensor 51- Brake Pedal (Left) 52- Service Brake Secondary Pres

sure Sensor 53- Brake Pedal (Right) 54- Brake Pedal (Right) Switch 55- Brake Pedal Position Sensor 60- Manual Regeneration Switch

63- Aftertreatment Device Regen

eration Signal 64- MPDr. 69- Lift Arm Angle Sensor 70- Bucket Angle Sensor 71- Axle Oil Temperature Sensor 72- Lift Arm Rod Pressure Sensor 73- Lift Arm Bottom Pressure Sen

sor 74- Position Sensor 75- Control Lever Lock Switch 80- Downshift Switch 83- Primary Pilot Pressure Sensor 84- Service Brake Primary Pres

sure Sensor 86- Object Detection Sensor 88- Joystick Steering Selector

Switch

Matching Control While Digging

Purpose:

The matching control while digging reduces the driving force by limiting the maximum engine speed of the engine and improves the balance between driving force and digging force.

TNUD-02-02-011-1 ja

A- Engine Speed Limit Value H- At End of Digging B- Operating Time (Second) J- Maximum Engine Speed D- At Start of Digging H- Specied Value (While Digging) E- While Digging L- Specied Value (While Fully Digging) F- While Fully Digging M- Specied Value (While Scraping Up) G- While Scooping Up

Operation:

NOTE

The time when forward/reverse switch (36) is eective is explained as an example.

1. TCU (7) sends the speed shift signals of transmission (8) to MC (3) by using CAN communication (17).

2. ECM (5) receives the signals from cam angle sensor (24) and crank speed sensor (23).

3. ECM (5) calculates them and sends a signal corresponding to the actual engine speed to MC (3) by using CAN communication (17).

4. MC (3) receives the signals from the pump delivery pressure sensor (38) and power mode switch (44).

TONFQ50-EN-00(28/02/2022)

T2-2-16

SECTION 2 SYSTEM

Group 2 Control System

5. When all following conditions exist, MC (3) sends the signal equivalent to the target engine speed to ECM (5) by using CAN communication (17).

• Forward/Reverse Lever (32) or Forward/Reverse Switch (36): Forward Position (33)

• Pump Delivery Pressure: High Pressure (Reference: 13 MPa or more)

• Torque Converter Speed Ratio: less than specied value (Reference: 15% or less)

NOTE The torque converter speed ratio is calculated from the following equation. N=P/Q

N- Torque Converter Speed Ratio

P- Torque Converter Output Shaft Speed

Q- Actual engine speed

6. ECM (5) sets the engine speed to specied value (K), specied value (L), and specied value (M) according to CAN communication (17).

Engine Speed according to Work Mode (Reference, at 1st Speed)

Digging Control Mode

Power Mode 2000 1840 1800 Standard 1750 1730 1800 Fork 2230 2230 2230 Digging (Heavy) 2000 1840 1800 Digging (Light) 1750 1730 1800

Digging (K) (Unit: min-1)

Fully Digging (L) (Unit:

min-1)

Scooping Up (M) (Unit: min-1)

NOTE

The engine speed diers according to the power mode and digging control mode settings.

NOTE

Forward/reverse switch (36) is also equipped on machines mounted with the joystick steering system. Forward/reverse switch (36) on the joystick steering system side is shifted between operable and inoperable by the joystick steering selector switch (88).

TONFQ50-EN-00(28/02/2022)

T2-2-17

2

1

83

75

5251 5355 54

32

33 34 35 88

36

33 34 35

48

31

69

71 72

80

73

70

84

86

20

37

43

15

14

74

17

63

3

MC

19

18

60

16

44

7

TCU

9

PLCU

4

5

ECM

13

11

10

64

46

21

38

25

24

23

22

26

27

29

28

30

6

8

41

47

SECTION 2 SYSTEM

Group 2 Control System

1- Accelerator Pedal 2- Accelerator Pedal Sensor 3- MC 4- Monitor Controller 5- ECM 6- Engine 7- TCU 8- Transmission 9- PLCU 10- Main Monitor 11- Column Display 13- Control Lever 14- Rotary Device 15- Panel Switch 1 16- Panel Switch 2 17- Power-CAN 18- Body-CAN 19- PL-CAN 20- SENSOR-CAN

21- IF-CAN 22- Boost Temperature Sensor 23- Crank Speed Sensor 24- Cam Angle Sensor 25- Coolant Temperature Sensor 26- Torque Converter Oil Temper

27- Torque Converter Input Shaft

28- Torque Converter Output

29- Transmission Intermediate

30- Vehicle Speed Sensor 31- Shift Switch 32- Forward/Reverse Lever 33- Forward Position 34- Neutral Position 35- Reverse Position

ature Sensor

Speed Sensor

Shaft Speed Sensor

36- Forward/Reverse Switch 37- Forward/Reverse Selector

Switch

38- Pump Delivery Pressure Sen

sor 41- Parking Brake Pressure Sensor 43- Clutch Cut-o Position Switch 44- Power Mode Switch 46- Sub Monitor 47- Key Switch 48- Hydraulic Oil Temperature

Sensor 51- Brake Pedal (Left) 52- Service Brake Secondary Pres

sure Sensor 53- Brake Pedal (Right) 54- Brake Pedal (Right) Switch 55- Brake Pedal Position Sensor 60- Manual Regeneration Switch

TNFQ-02-02-012-1 ja

63- Aftertreatment Device Regen

eration Signal 64- MPDr. 69- Lift Arm Angle Sensor 70- Bucket Angle Sensor 71- Axle Oil Temperature Sensor 72- Lift Arm Rod Pressure Sensor 73- Lift Arm Bottom Pressure Sen

sor 74- Position Sensor 75- Control Lever Lock Switch 80- Downshift Switch 83- Primary Pilot Pressure Sensor 84- Service Brake Primary Pres

sure Sensor 86- Object Detection Sensor 88- Joystick Steering Selector

Switch

TONFQ50-EN-00(28/02/2022)

T2-2-18

E

a b

B

D

C

A

E

B

C, D

A

SECTION 2 SYSTEM

Group 2 Control System

Speed Limit Control with Power Mode OFF

Purpose:

The speed limit control with power mode OFF limits the maximum engine speed of the engine according to driving load with the power mode set to OFF. Therefore, fuel consumption is reduced.

TNFQ-02-02-014-1 ja

A- Engine Speed

E- Specied Value (lower than 2nd speed: 1750 min-1, 3rd Speed: 2040 min

-1

)

B- Driving Load a- Shift Speed: lower than 2nd speed C- Specied Value (lower than 2nd speed: 2070 min-1, 3rd

Speed: 2230 min

-1

)

b- Shift Speed: Third Speed

D- Specied Value (lower than 2nd speed: 2050 min-1, 3rd Speed: 2230 min

-1

)

Operation:

NOTE

The time when forward/reverse switch (36) is eective is explained as an example.

1. TCU (7) sends the speed shift signals of transmission (8) to MC (3) by using CAN communication (17).

2. ECM (5) receives the signals from cam angle sensor (24) and crank speed sensor (23).

3. ECM (5) calculates them and sends a signal corresponding to the actual engine speed to MC (3) by using CAN communication (17).

4. When all following conditions exist, MC (3) sends the signal equivalent to the target engine speed to ECM (5) by using CAN communication (17).

• Forward/reverse lever (32) or forward/reverse switch (36): Forward position (33) or reverse position (35)

• Power mode: OFF

NOTE

When key switch (47) is set to the OFF position and then set back to the ON position, the power mode is turned OFF.

5. ECM (5) limits the engine speed to the specied value according to CAN communication (17).

• When the speed shift signal is third speed or lower, the engine speed is decreased and limited to the specied

value from the maximum rotation speed of the engine according to driving load.

• When the speed shift signal is fourth speed, the engine speed is limited to the maximum rotation speed.

NOTE

MC (3) detects driving load by using the torque converter speed ratio. The torque converter speed ratio is calculated from the following equation.

TONFQ50-EN-00(28/02/2022)

T2-2-19

2

1

83

75

5251 5355 54

32

33 34 35 88

36

33 34 35

48

31

69

71 72

80

73

70

84

86

20

37

43

15

14

74

17

63

3

MC

19

18

60

16

44

7

TCU

9

PLCU

4

5

ECM

13

11

10

64

46

21

38

25

24

23

22

26

27

29

28

30

6

8

41

47

SECTION 2 SYSTEM

Group 2 Control System

J=K/L

J- Torque Converter Speed Ratio

K- Torque Converter Output Shaft Speed

L- Actual engine speed

NOTE

Forward/reverse switch (36) is also equipped on machines mounted with the joystick steering system. Forward/reverse switch (36) on the joystick steering system side is shifted between operable and inoperable by the joystick steering selector switch (88).

TNFQ-02-02-015-1 ja

TONFQ50-EN-00(28/02/2022)

T2-2-20

A

B

D,E

C

SECTION 2 SYSTEM

Group 2 Control System

1- Accelerator Pedal 2- Accelerator Pedal Sensor 3- MC 4- Monitor Controller 5- ECM 6- Engine 7- TCU 8- Transmission 9- PLCU 10- Main Monitor 11- Column Display 13- Control Lever 14- Rotary Device 15- Panel Switch 1 16- Panel Switch 2 17- Power-CAN 18- Body-CAN 19- PL-CAN 20- SENSOR-CAN

21- IF-CAN 22- Boost Temperature Sensor 23- Crank Speed Sensor 24- Cam Angle Sensor 25- Coolant Temperature Sensor 26- Torque Converter Oil Temper

ature Sensor

27- Torque Converter Input Shaft

Speed Sensor

28- Torque Converter Output

Shaft Speed Sensor

29- Transmission Intermediate

Shaft Speed Sensor 30- Vehicle Speed Sensor 31- Shift Switch 32- Forward/Reverse Lever 33- Forward Position 34- Neutral Position 35- Reverse Position

36- Forward/Reverse Switch 37- Forward/Reverse Selector

Switch

38- Pump Delivery Pressure Sen

sor 41- Parking Brake Pressure Sensor 43- Clutch Cut-o Position Switch 44- Power Mode Switch 46- Sub Monitor 47- Key Switch 48- Hydraulic Oil Temperature

Sensor 51- Brake Pedal (Left) 52- Service Brake Secondary Pres

sure Sensor 53- Brake Pedal (Right) 54- Brake Pedal (Right) Switch 55- Brake Pedal Position Sensor 60- Manual Regeneration Switch

63- Aftertreatment Device Regen

eration Signal 64- MPDr. 69- Lift Arm Angle Sensor 70- Bucket Angle Sensor 71- Axle Oil Temperature Sensor 72- Lift Arm Rod Pressure Sensor 73- Lift Arm Bottom Pressure Sen

sor 74- Position Sensor 75- Control Lever Lock Switch 80- Downshift Switch 83- Primary Pilot Pressure Sensor 84- Service Brake Primary Pres

sure Sensor 86- Object Detection Sensor 88- Joystick Steering Selector

Switch

Auto Power Up Speed Control

Purpose:

Auto power up speed control increases the maximum engine speed when the driving load increases, for example, when climbing on a slope while speed limit control with power mode OFF is activated. Therefore, acceleration while climbing a slope is improved.

TNFQ-02-02-016-1 ja

A- Engine Speed D- Specied Value (specied value (E) not exceeded by 150

min-1 increase from engine demand speed during opera tion)

B- Driving Load

E- Specied Value (F1/F2: 2000 min-1, F3/R1/R2: 2100 min-1, R3: 2230 min

-1

)

C- Specied Value (specied value (E) not exceeded by 150 min-1 increase from engine demand speed during opera

tion)

Operation:

1. Position sensor (74) sends the vehicle position angle signal to MC (3) by using CAN communication (20). At the same time, TCU (7) sends the signal equivalent to the command transmission speed to MC (3) by using CAN communication (17).

2. When speed limit control with power mode OFF is activated, MC (3) calculates the signal from TCU (7) and the signal from position sensor (74) internally to calculate the signal equivalent to the target engine speed. MC (3) sends the signal equivalent to the target engine speed to ECM (5) by using CAN communication (17).

TONFQ50-EN-00(28/02/2022)

T2-2-21

SECTION 2 SYSTEM

Group 2 Control System

NOTE

When key switch (47) is set to the OFF position, the power mode is turned OFF.

3. any of the following conditions 1, 2 or 3 exists, ECM (5) increases the engine speed to specied value (C), specied value (D) or specied value (E) corresponding to the condition.

Description of Conditions Target Engine Speed

Condition 1 Torque converter speed ratio is held for a specied range (Ref

erence: more than 0.4 and less than 0.7) for a specied time (speed 1 to speed 3 reference: for 1 second)

Condition 2 Torque converter speed ratio is held for a specied range (Ref

erence: more than 0.4 and less than 0.7) for a specied time (speed 1 to speed 3 reference: for 1.5 seconds)

Condition 3 Command transmission speed is in forward direction and the

estimated vehicle position angle is held for 1 second over the specied value (Reference: 5°) or the command transmission speed is in the reverse direction and the estimated vehicle po sition angle is held for 1 second less than the specied value (Reference: -5°)

Specied value (C): Specied value (E) not exceeded by 150 min-1 increase

from engine demand speed during op eration)

Specied value (D): Specied value (E) not exceeded by 150 min-1 increase

from engine demand speed during op eration)

Specied value (E)

NOTE

MC (3) detects driving load by using the torque converter speed ratio. The torque converter speed ratio is calculated from the following equation.

J=K/L

J- Torque Converter Speed Ratio L- Actual Engine Speed K- Torque Converter Output Shaft Speed

Deactivation:

NOTE

The time when forward/reverse switch (36) is eective is explained as an example.

1. When following conditions 1, 2 or 3 exist, MC (3) deactivates the auto power up speed control.

Engine Speed During Op

eration

Condition 1 Specied value (C)

Condition 2 Specied value (D) Torque converter speed ratio is held for a specied range (Reference: 0.9 or

Condition 3 Specied value (E) The estimated vehicle position angle is held in the specied range (Refer

When the engine speed (specied value (C)) that has increased 150 min-1 is less than the engine speed with the power mode set at OFF, forward/ reverse lever (32): operated, forward/reverse switch (36): operated or accel erator pedal (1): neutral position

more) for 2 seconds, forward/reverse lever (32): operated, forward/reverse switch (36): operated or accelerator pedal (1): neutral position

ence: -3° to 3°) for 1.5 seconds

Description of Conditions

NOTE

Forward/reverse switch (36) is also equipped on machines mounted with the joystick steering system. Forward/reverse switch (36) on the joystick steering system side is shifted between operable and inoperable by joystick steering selector switch (88).

TONFQ50-EN-00(28/02/2022)

T2-2-22

2

1

83

75

5251 5355 54

32

33 34 35 88

36

33 34 35

48

31

69

71 72

80

73

70

84

86

20

37

43

15

14

74

17

63

3

MC

19

18

60

16

44

7

TCU

9

PLCU

4

5

ECM

13

11

10

64

46

21

38

25

24

23

22

26

27

29

28

30

6

8

41

47

SECTION 2 SYSTEM

Group 2 Control System

1- Accelerator Pedal 2- Accelerator Pedal Sensor 3- MC 4- Monitor Controller 5- ECM 6- Engine 7- TCU 8- Transmission 9- PLCU 10- Main Monitor 11- Column Display 13- Control Lever 14- Rotary Device 15- Panel Switch 1 16- Panel Switch 2 17- Power-CAN 18- Body-CAN 19- PL-CAN 20- SENSOR-CAN

21- IF-CAN 22- Boost Temperature Sensor 23- Crank Speed Sensor 24- Cam Angle Sensor 25- Coolant Temperature Sensor 26- Torque Converter Oil Temper

27- Torque Converter Input Shaft

28- Torque Converter Output

29- Transmission Intermediate

30- Vehicle Speed Sensor 31- Shift Switch 32- Forward/Reverse Lever 33- Forward Position 34- Neutral Position 35- Reverse Position

ature Sensor

Speed Sensor

Shaft Speed Sensor

36- Forward/Reverse Switch 37- Forward/Reverse Selector

Switch

38- Pump Delivery Pressure Sen

sor 41- Parking Brake Pressure Sensor 43- Clutch Cut-o Position Switch 44- Power Mode Switch 46- Sub Monitor 47- Key Switch 48- Hydraulic Oil Temperature

Sensor 51- Brake Pedal (Left) 52- Service Brake Secondary Pres

sure Sensor 53- Brake Pedal (Right) 54- Brake Pedal (Right) Switch 55- Brake Pedal Position Sensor 60- Manual Regeneration Switch

TNFQ-02-02-017-1 ja

63- Aftertreatment Device Regen

eration Signal 64- MPDr. 69- Lift Arm Angle Sensor 70- Bucket Angle Sensor 71- Axle Oil Temperature Sensor 72- Lift Arm Rod Pressure Sensor 73- Lift Arm Bottom Pressure Sen

sor 74- Position Sensor 75- Control Lever Lock Switch 80- Downshift Switch 83- Primary Pilot Pressure Sensor 84- Service Brake Primary Pres

sure Sensor 86- Object Detection Sensor 88- Joystick Steering Selector

Switch

TONFQ50-EN-00(28/02/2022)

T2-2-23

A

B

CD

F

G

E

SECTION 2 SYSTEM

Group 2 Control System

Overheat Prevention Speed Limit Control

Purpose:

The overheat prevention speed limit control limits the maximum engine speed of the engine and prevents the engine overheating when the coolant temperature, hydraulic oil temperature, torque converter oil temperature, or axle oil temperature increases to the upper limit.

TNUD-02-02-020-1 ja

A- Engine Speed E- Axle Oil Temperature (110 °C)/Torque Converter Oil Tem

perature (112 °C) B- Temperature F- Maximum Rotation Speed C- Hydraulic Oil Temperature (93 °C) G- Specied Value (Limited According to Coolant Tempera

ture/Axle Oil Temperature: 2070 min-1, Limited According to

Hydraulic Oil Temperature/Torque Converter Oil Tempera

ture: 2000 min-1) D- Coolant Temperature (104 °C)

Operation:

1. ECM (5) sends the signal from coolant temperature sensor (25) to MC (3) by using CAN communication (17).

2. TCU (7) sends the signal from the torque converter oil temperature sensor (26) to MC (3) by using CAN communication (17).

3. MC (3) receives the signals from the hydraulic oil temperature sensor (48) and axle oil temperature sensor (71).

4. any of the following conditions exists, MC (3) sends the signal equivalent to the target engine speed to ECM (5) by using CAN communication (17).

• Coolant Temperature: 104 °C or more

• Torque Converter Oil Temperature: 112 °C or more

• Hydraulic oil temperature: 93 °C or more

• Axle Oil Temperature: 110 °C or more

5. ECM (5) limits the engine speed to specied value (G) according to CAN communication (17).

TONFQ50-EN-00(28/02/2022)

T2-2-24

2

1

83

75

5251 5355 54

32

33 34 35 88

36

33 34 35

48

31

69

71 72

80

73

70

84

86

20

37

43

15

14

74

17

63

3

MC

19

18

60

16

44

7

TCU

9

PLCU

4

5

ECM

13

11

10

64

46

21

38

25

24

23

22

26

27

29

28

30

6

8

41

47

SECTION 2 SYSTEM

Group 2 Control System

1- Accelerator Pedal 2- Accelerator Pedal Sensor 3- MC 4- Monitor Controller 5- ECM 6- Engine 7- TCU 8- Transmission 9- PLCU 10- Main Monitor 11- Column Display 13- Control Lever 14- Rotary Device 15- Panel Switch 1 16- Panel Switch 2 17- Power-CAN 18- Body-CAN 19- PL-CAN 20- SENSOR-CAN

21- IF-CAN 22- Boost Temperature Sensor 23- Crank Speed Sensor 24- Cam Angle Sensor 25- Coolant Temperature Sensor 26- Torque Converter Oil Temper

27- Torque Converter Input Shaft

28- Torque Converter Output

29- Transmission Intermediate

30- Vehicle Speed Sensor 31- Shift Switch 32- Forward/Reverse Lever 33- Forward Position 34- Neutral Position 35- Reverse Position

ature Sensor

Speed Sensor

Shaft Speed Sensor

36- Forward/Reverse Switch 37- Forward/Reverse Selector

Switch

38- Pump Delivery Pressure Sen

sor 41- Parking Brake Pressure Sensor 43- Clutch Cut-o Position Switch 44- Power Mode Switch 46- Sub Monitor 47- Key Switch 48- Hydraulic Oil Temperature

Sensor 51- Brake Pedal (Left) 52- Service Brake Secondary Pres

sure Sensor 53- Brake Pedal (Right) 54- Brake Pedal (Right) Switch 55- Brake Pedal Position Sensor 60- Manual Regeneration Switch

TNFQ-02-02-021-1 ja

63- Aftertreatment Device Regen

eration Signal 64- MPDr. 69- Lift Arm Angle Sensor 70- Bucket Angle Sensor 71- Axle Oil Temperature Sensor 72- Lift Arm Rod Pressure Sensor 73- Lift Arm Bottom Pressure Sen

sor 74- Position Sensor 75- Control Lever Lock Switch 80- Downshift Switch 83- Primary Pilot Pressure Sensor 84- Service Brake Primary Pres

sure Sensor 86- Object Detection Sensor 88- Joystick Steering Selector

Switch

TONFQ50-EN-00(28/02/2022)

T2-2-25

SECTION 2 SYSTEM

Group 2 Control System

Aftertreatment Device Manual Regeneration Control

Purpose:

The aftertreatment device manual regeneration control increases the engine speed and applies load to the engine. Therefore, this control assists to increase the exhaust temperature up to the temperature that a catalyst in the aftertreatment device is activated.

Operation:

NOTE

The time when forward/reverse switch (36) is eective is explained as an example.

1. When manual regeneration of the aftertreatment device is required, ECM (5) sends the aftertreatment device regeneration request signal to MC (3) by using CAN communication (17). (Refer to "Aftertreatment Device

Regeneration Control"T2-3-21.)

2. When all following conditions exist, MC (3) sends aftertreatment device regeneration request signal (63) to ECM (5).

• Manual regeneration switch (60):ON

• Accelerator Pedal (1): Not operated

• Parking Brake: Operation

• Forward/Reverse Lever (32) and Forward/Reverse Switch (36): Neutral Position (34)

• Control Lever Lock: Operation (primary pilot pressure sensor (83) at less than specied value by control lever lock

switch (ON))

3. ECM (5) increases the engine speed and increases the exhaust temperature up to the temperature that a catalyst in the aftertreatment device is activated.

NOTE

Forward/reverse switch (36) is also equipped on machines mounted with the joystick steering system. Forward/reverse switch (36) on the joystick steering system side is shifted between operable and inoperable by joystick steering selector switch (88).

TONFQ50-EN-00(28/02/2022)

T2-2-26

2

1

83

75

5251 5355 54

32

33 34 35 88

36

33 34 35

48

31

69

71 72

80

73

70

84

86

20

37

43

15

14

74

17

63

3

MC

19

18

60

16

44

7

TCU

9

PLCU

4

5

ECM

13

11

10

64

46

21

38

25

24

23

22

26

27

29

28

30

6

8

41

47

SECTION 2 SYSTEM

Group 2 Control System

1- Accelerator Pedal 2- Accelerator Pedal Sensor 3- MC 4- Monitor Controller 5- ECM 6- Engine 7- TCU 8- Transmission 9- PLCU 10- Main Monitor 11- Column Display 13- Control Lever 14- Rotary Device 15- Panel Switch 1 16- Panel Switch 2 17- Power-CAN 18- Body-CAN 19- PL-CAN 20- SENSOR-CAN

21- IF-CAN 22- Boost Temperature Sensor 23- Crank Speed Sensor 24- Cam Angle Sensor 25- Coolant Temperature Sensor 26- Torque Converter Oil Temper

27- Torque Converter Input Shaft

28- Torque Converter Output

29- Transmission Intermediate

30- Vehicle Speed Sensor 31- Shift Switch 32- Forward/Reverse Lever 33- Forward Position 34- Neutral Position 35- Reverse Position

ature Sensor

Speed Sensor

Shaft Speed Sensor

36- Forward/Reverse Switch 37- Forward/Reverse Selector

Switch

38- Pump Delivery Pressure Sen

sor 41- Parking Brake Pressure Sensor 43- Clutch Cut-o Position Switch 44- Power Mode Switch 46- Sub Monitor 47- Key Switch 48- Hydraulic Oil Temperature

Sensor 51- Brake Pedal (Left) 52- Service Brake Secondary Pres

sure Sensor 53- Brake Pedal (Right) 54- Brake Pedal (Right) Switch 55- Brake Pedal Position Sensor 60- Manual Regeneration Switch

TNFQ-02-02-024-1 ja

63- Aftertreatment Device Regen

eration Signal 64- MPDr. 69- Lift Arm Angle Sensor 70- Bucket Angle Sensor 71- Axle Oil Temperature Sensor 72- Lift Arm Rod Pressure Sensor 73- Lift Arm Bottom Pressure Sen

sor 74- Position Sensor 75- Control Lever Lock Switch 80- Downshift Switch 83- Primary Pilot Pressure Sensor 84- Service Brake Primary Pres

sure Sensor 86- Object Detection Sensor 88- Joystick Steering Selector

Switch

TONFQ50-EN-00(28/02/2022)

T2-2-27

SECTION 2 SYSTEM

Group 2 Control System

Engine Over Speed Limit Control

Purpose:

Engine overload prevention control activates the exhaust brake mounted on the engine when the engine speed has risen above the allowable value, for example, when traveling down slopes. Therefore, the engine speed is reduced to prevent damage to the hydraulic pump and transmission.

Operation:

NOTE

The time when forward/reverse switch (36) is eective is explained as an example.

1. Position sensor (74) sends the vehicle position angle signal to MC (3) by using CAN communication (20).

2. PLCU (9) receives the signals (the demand engine speed) from accelerator pedal sensor (2) and sends them to MC (3) by using CAN communication (17). At the same time, PLCU (9) receives the signals from forward/reverse lever (32) and sends them to TCU (7) by using CAN communication (17).

3. TCU (7) sends the vehicle speed signal, transmission speed shift signal, and current FNR command signal to MC (3) by using CAN communication (17).

4. ECM (5) receives the signals from cam angle sensor (24) and crank speed sensor (23).

5. ECM (5) calculates them and sends a signal corresponding to the actual engine speed to MC (3) by using CAN communication (17).

6. When any of following conditions 1, 2 or 3 exists, MC (3) sends the exhaust brake operation signal to ECM (5) by using CAN communication (17).

Accelerator pedal

(1)

Condition 1- Forward position (33) or

Condition 2Not Operated - - Judgment condition A or

Condition 3Operation - Specied value or less held

Judgment condition A: When all following conditions exist

• Engine speed calculated value is 2100 min-1 or more

• Engine speed rate of change is over specied value

• Transmission output speed rate of change is over specied value and engine torque is 5% or less

Judgment Condition B: When all following conditions exist

• Engine speed calculated value is 2350 min-1 or more and engine torque is 5% or less

• Transmission output speed rate of change is over specied value and 2.5 seconds has elapsed after shift down

7. ECM (5) activates the exhaust brake.

Deactivation:

1. When either of following condition 1 or condition 2 exists, ECM (5) deactivates the exhaust brake

Forward/reverse lever (32)

or forward/reverse switch

(36)

reverse position (35)

Position sensor (74) Judgment condition

Specied value or more held for 1 second

for 1 second

Judgment condition A or judgment condition B exist.

judgment condition B exist. Judgment condition B exist.

Accelerator pedal (1) Engine speed calculated value: Transmission Output Speed

Condition 1 Not Operated

Condition 2 Operated

TONFQ50-EN-00(28/02/2022)

1600 min-1 or less

2100 min-1 or less

T2-2-28

Threshold value corresponding to command transmission speed or less

2

1

83

75

5251 5355 54

32

33 34 35 88

36

33 34 35

48

31

69

71 72

80

73

70

84

86

20

37

43

15

14

74

17

63

3

MC

19

18

60

16

44

7

TCU

9

PLCU

4

5

ECM

13

11

10

64

46

21

38

25

24

23

22

26

27

29

28

30

6

8

41

47

SECTION 2 SYSTEM

Group 2 Control System

NOTE

Forward/reverse switch (36) is also equipped on machines mounted with the joystick steering system. Forward/reverse switch (36) on the joystick steering system side is shifted between operable and inoperable by joystick steering selector switch (88).

TNFQ-02-02-025-1 ja

TONFQ50-EN-00(28/02/2022)

T2-2-29

SECTION 2 SYSTEM

Group 2 Control System

1- Accelerator Pedal 2- Accelerator Pedal Sensor 3- MC 4- Monitor Controller 5- ECM 6- Engine 7- TCU 8- Transmission 9- PLCU 10- Main Monitor 11- Column Display 13- Control Lever 14- Rotary Device 15- Panel Switch 1 16- Panel Switch 2 17- Power-CAN 18- Body-CAN 19- PL-CAN 20- SENSOR-CAN

21- IF-CAN 22- Boost Temperature Sensor 23- Crank Speed Sensor 24- Cam Angle Sensor 25- Coolant Temperature Sensor 26- Torque Converter Oil Temper

ature Sensor

27- Torque Converter Input Shaft

Speed Sensor

28- Torque Converter Output

Shaft Speed Sensor

29- Transmission Intermediate

Shaft Speed Sensor 30- Vehicle Speed Sensor 31- Shift Switch 32- Forward/Reverse Lever 33- Forward Position 34- Neutral Position 35- Reverse Position

36- Forward/Reverse Switch 37- Forward/Reverse Selector

Switch

38- Pump Delivery Pressure Sen

sor 41- Parking Brake Pressure Sensor 43- Clutch Cut-o Position Switch 44- Power Mode Switch 46- Sub Monitor 47- Key Switch 48- Hydraulic Oil Temperature

Sensor 51- Brake Pedal (Left) 52- Service Brake Secondary Pres

sure Sensor 53- Brake Pedal (Right) 54- Brake Pedal (Right) Switch 55- Brake Pedal Position Sensor 60- Manual Regeneration Switch

63- Aftertreatment Device Regen

eration Signal 64- MPDr. 69- Lift Arm Angle Sensor 70- Bucket Angle Sensor 71- Axle Oil Temperature Sensor 72- Lift Arm Rod Pressure Sensor 73- Lift Arm Bottom Pressure Sen

sor 74- Position Sensor 75- Control Lever Lock Switch 80- Downshift Switch 83- Primary Pilot Pressure Sensor 84- Service Brake Primary Pres

sure Sensor 86- Object Detection Sensor 88- Joystick Steering Selector

Switch

Engine Max. Speed Limit Control at Stroke End Stall and Front Relief

Purpose:

Maximum engine speed limit control during brake stalling and front attachment relief limits the engine speed to reduce fuel consumption when brake stalling and front relief operations are performed with the lift arm or bucket cylinder at the stroke end.

Operation:

1. When all following conditions exist, ECM (5) lowers the engine speed to 1650 min-1.

• Accelerator pedal (1): Operated

• Brake pedals (51, 53): Operated

• Torque converter speed ratio: specied value or less

• Pump delivery pressure sensor (38): specied value or more

• Lift arm or bucket: Relief operation

NOTE The torque converter speed ratio is calculated from the following equation. J=K/L

J- Torque Converter Speed Ratio L- Actual Engine Speed K- Torque Converter Output Shaft Speed

Deactivation:

1. When any of the following conditions exists, MC (5) deactivates maximum engine speed limit control during brake stalling and front attachment relief.

• Accelerator pedal (1): Not operated

• Brake pedals (51, 53): Not operated

• Torque converter speed ratio: specied value or more

• Pump delivery pressure sensor (38): Specied value or less

• Lift arm or bucket: Relief

TONFQ50-EN-00(28/02/2022)

T2-2-30

2

1

83

75

5251 5355 54

32

33 34 35 88

36

33 34 35

48

31

69

71 72

80

73

70

84

86

20

37

43

15

14

74

17

63

3

MC

19

18

60

16

44

7

TCU

9

PLCU

4

5

ECM

13

11

10

64

46

21

38

25

24

23

22

26

27

29

28

30

6

8

41

47

SECTION 2 SYSTEM

Group 2 Control System

1- Accelerator Pedal 2- Accelerator Pedal Sensor 3- MC 4- Monitor Controller 5- ECM 6- Engine 7- TCU 8- Transmission 9- PLCU 10- Main Monitor 11- Column Display 13- Control Lever 14- Rotary Device 15- Panel Switch 1 16- Panel Switch 2 17- Power-CAN 18- Body-CAN 19- PL-CAN 20- SENSOR-CAN

21- IF-CAN 22- Boost Temperature Sensor 23- Crank Speed Sensor 24- Cam Angle Sensor 25- Coolant Temperature Sensor 26- Torque Converter Oil Temper

27- Torque Converter Input Shaft

28- Torque Converter Output

29- Transmission Intermediate

30- Vehicle Speed Sensor 31- Shift Switch 32- Forward/Reverse Lever 33- Forward Position 34- Neutral Position 35- Reverse Position

ature Sensor

Speed Sensor

Shaft Speed Sensor

36- Forward/Reverse Switch 37- Forward/Reverse Selector

Switch

38- Pump Delivery Pressure Sen

sor 41- Parking Brake Pressure Sensor 43- Clutch Cut-o Position Switch 44- Power Mode Switch 46- Sub Monitor 47- Key Switch 48- Hydraulic Oil Temperature

Sensor 51- Brake Pedal (Left) 52- Service Brake Secondary Pres

sure Sensor 53- Brake Pedal (Right) 54- Brake Pedal (Right) Switch 55- Brake Pedal Position Sensor 60- Manual Regeneration Switch

TNFQ-02-02-026-1 ja

63- Aftertreatment Device Regen

eration Signal 64- MPDr. 69- Lift Arm Angle Sensor 70- Bucket Angle Sensor 71- Axle Oil Temperature Sensor 72- Lift Arm Rod Pressure Sensor 73- Lift Arm Bottom Pressure Sen

sor 74- Position Sensor 75- Control Lever Lock Switch 80- Downshift Switch 83- Primary Pilot Pressure Sensor 84- Service Brake Primary Pres

sure Sensor 86- Object Detection Sensor 88- Joystick Steering Selector

Switch

TONFQ50-EN-00(28/02/2022)

T2-2-31

A

BDC

G

F

E

SECTION 2 SYSTEM

Group 2 Control System

Engine Torque Limit Control During Acceleration

Purpose:

Engine torque limit control during acceleration limits the engine torque during travel to control unnecessary acceleration. Therefore, fuel consumption is reduced.

TNFQ-02-02-100-1 ja

A- Engine Torque E- No Restriction B- Engine Speed F- Engine Torque Restriction Level 1 C- Minimum Rotation Speed G- Engine Torque Restriction Level 2 D- Maximum Rotation Speed

Operation:

1. When following condition 1 and condition 2 exist, and condition 3 does not exist,, MC (3) sends the signal equivalent to engine torque restriction level 2 to ECM (5) by using CAN communication (17).

Description of Conditions

Condition 1 Axle oil temperature is at the specied value (Reference: 40 °C) or more, and the estimated vehicle

position angle is less than the specied value

Condition 2 Vehicle Speed: 12 km/h or more, and the transmission speed: 3rd speed range or higher or the

transmission speed 2nd speed range or higher when in an operation position and the torque con verter speed ratio is at the specied value (Reference: 70%) or more

Condition 3 Power mode: ON, accelerator pedal: depressing (Reference: 75% or more) and the estimated vehi

cle position angle is in the specied range (Reference: 4° or more (when transmission is forward) or reference: 4° or less (when transmission is reverse))

NOTE

MC (3) detects driving load by using the torque converter speed ratio. The torque converter speed ratio is calculated from the following equation.

J=K/L

J- Torque Converter Speed Ratio L- Actual Engine Speed K- Torque Converter Output Shaft Speed

2. ECM (5) limits the engine torque according to the engine speed.

3. When any of the following conditions exists, MC (3) sends the signal equivalent to engine torque restriction level 1 to ECM (5) by using CAN communication (17).

TONFQ50-EN-00(28/02/2022)

T2-2-32

2

1

83

75

5251 5355 54

32

33 34 35 88

36

33 34 35

48

31

69

71 72

80

73

70

84

86

20

37

43

15

14

74

17

63

3

MC

19

18

60

16

44

7

TCU

9

PLCU

4

5

ECM

13

11

10

64

46

21

38

25

24

23

22

26

27

29

28

30

6

8

41

47

SECTION 2 SYSTEM

Group 2 Control System

• When accelerator pedal (1) is not depressed: transmission output speed rate of change is specied value

(Reference: -500 min-1) or less continuously for over the specied time (Reference: 1 second) or more

• When accelerator pedal (1) is depressed: transmission output speed rate of change is specied value (Reference:

-100 min-1) or less continuously for over the specied time (Reference: 0.5 seconds)

4. ECM (5) limits the engine torque according to the engine speed.

NOTE

When any of the conditions in step 3 exists again, MC (3) sends the signal corresponding to engine torque restriction suspend to ECM (5), and engine torque restriction is suspended.

5. When all following conditions exist, MC (3) sends the signals equivalent to engine torque restriction level 2 to ECM (5) by using CAN communication (17).

• transmission output speed rate of change is specied value (Reference: 100 min-1) continuously for over the

specied time (Reference: 1 second)

• The estimated vehicle position angle is the specied range (Reference: -2° to 2°) continuously for over the specied

time (Reference: 1 second)

6. ECM (5) limits the engine torque according to the engine speed.

TONFQ50-EN-00(28/02/2022)

T2-2-33

TNFQ-02-02-101-1 ja

SECTION 2 SYSTEM

Group 2 Control System

1- Accelerator Pedal 2- Accelerator Pedal Sensor 3- MC 4- Monitor Controller 5- ECM 6- Engine 7- TCU 8- Transmission 9- PLCU 10- Main Monitor 11- Column Display 13- Control Lever 14- Rotary Device 15- Panel Switch 1 16- Panel Switch 2 17- Power-CAN 18- Body-CAN 19- PL-CAN 20- SENSOR-CAN

21- IF-CAN 22- Boost Temperature Sensor 23- Crank Speed Sensor 24- Cam Angle Sensor 25- Coolant Temperature Sensor 26- Torque Converter Oil Temper

ature Sensor

27- Torque Converter Input Shaft

Speed Sensor

28- Torque Converter Output

Shaft Speed Sensor

29- Transmission Intermediate

Shaft Speed Sensor 30- Vehicle Speed Sensor 31- Shift Switch 32- Forward/Reverse Lever 33- Forward Position 34- Neutral Position 35- Reverse Position

Pump Control

The pump control consists of the followings.

● Basic Torque Control

● Torque Decrease Control While Digging

36- Forward/Reverse Switch 37- Forward/Reverse Selector

Switch

38- Pump Delivery Pressure Sen

sor 41- Parking Brake Pressure Sensor 43- Clutch Cut-o Position Switch 44- Power Mode Switch 46- Sub Monitor 47- Key Switch 48- Hydraulic Oil Temperature

Sensor 51- Brake Pedal (Left) 52- Service Brake Secondary Pres

sure Sensor 53- Brake Pedal (Right) 54- Brake Pedal (Right) Switch 55- Brake Pedal Position Sensor 60- Manual Regeneration Switch

63- Aftertreatment Device Regen

eration Signal 64- MPDr. 69- Lift Arm Angle Sensor 70- Bucket Angle Sensor 71- Axle Oil Temperature Sensor 72- Lift Arm Rod Pressure Sensor 73- Lift Arm Bottom Pressure Sen

sor 74- Position Sensor 75- Control Lever Lock Switch 80- Downshift Switch 83- Primary Pilot Pressure Sensor 84- Service Brake Primary Pres

sure Sensor 86- Object Detection Sensor 88- Joystick Steering Selector

Switch

TONFQ50-EN-00(28/02/2022)

T2-2-34

Pump Control System Layout

2

1

75

32

33 34 35 88

36

33 34 35

48

37

15

14

17

19

18

16

9

PLCU

7

TCU

5

ECM

3

MC

4

13

11

10

64

46

50

21

38

25

24

23

22

26

27

29

28

30

6

8

39

47

SECTION 2 SYSTEM

Group 2 Control System

1- Accelerator Pedal 2- Accelerator Pedal Sensor 3- MC 4- Monitor Controller 5- ECM 6- Engine 7- TCU 8- Transmission 9- PLCU 10- Main Monitor 11- Column Display 13- Control Lever 14- Rotary Device

15- Panel Switch 1 16- Panel Switch 2 17- Power-CAN 18- Body-CAN 19- PL-CAN 21- IF-CAN 22- Boost Temperature Sensor 23- Crank Speed Sensor 24- Cam Angle Sensor 25- Coolant Temperature Sensor 26- Torque Converter Oil Temper

ature Sensor

27- Torque Converter Input Shaft

Speed Sensor

28- Torque Converter Output

Shaft Speed Sensor

29- Transmission Intermediate

Shaft Speed Sensor 30- Vehicle Speed Sensor 32- Forward/Reverse Lever 33- Forward Position 34- Neutral Position 35- Reverse Position 36- Forward/Reverse Switch

TNFQ-02-02-203-1 ja

37- Forward/Reverse Selector

Switch

38- Pump Delivery Pressure Sen

sor 39- Torque Control Solenoid Valve 46- Sub Monitor 47- Key Switch 48- Hydraulic Oil Temperature

Sensor 50- GSM 64- MPDr. 75- Control Lever Lock Switch 88- Joystick Steering Selector

Switch

TONFQ50-EN-00(28/02/2022)

T2-2-35

A

B

C

E

D

F

SECTION 2 SYSTEM

Group 2 Control System

Base Torque Control

Purpose:

The base torque control controls the pump delivery ow rate in response to the engine speed changes due to variations in load. Then, the engine torque can be utilized more eciently.

TNUD-02-02-027-1 ja

A- Pump Torque Reading (Nm) D- Hydraulic Oil Temperature (Low) B- Actual Engine Speed (min-1)

C- Hydraulic Oil Temperature (High) F- Demand Engine Speed Level (High)

Operation:

1. The target engine speed can be set by the depressing amount of accelerator pedal (1). (Refer to "Accelerator Pedal

Control"T2-2-5.)

2. ECM (5) receives the signals from cam angle sensor (24) and crank speed sensor (23).

3. ECM (5) calculates them and sends a signal corresponding to the actual engine speed to MC (3) by using CAN communication (17).

4. MC (3) compares the dierence between the target engine speed and the actual engine speed signal received from ECM (5).

5. MC (3) activates torque control solenoid valve (39) according to the signal from hydraulic oil temperature sensor (48) so that the engine speed becomes the target engine speed according to the hydraulic oil temperature.

6. The torque control solenoid valve (39) delivers the pilot pressure according to the signal to the regulator and controls the pump delivery ow rate. Therefore, the engine load is reduced and the engine stall is prevented.

E- Demand Engine Speed Level (Low)

NOTE

While digging, refer to "Torque Decrease Control While Digging"T2-2-37.

TONFQ50-EN-00(28/02/2022)

T2-2-36

2

1

75

32

33 34 35 88

36

33 34 35

48

37

15

14

17

19

18

16

9

PLCU

7

TCU

5

ECM

3

MC

4

13

11

10

64

46

50

21

38

25

24

23

22

26

27

29

28

30

6

8

39

47

SECTION 2 SYSTEM

Group 2 Control System

1- Accelerator Pedal 2- Accelerator Pedal Sensor 3- MC 4- Monitor Controller 5- ECM 6- Engine 7- TCU 8- Transmission 9- PLCU 10- Main Monitor 11- Column Display 13- Control Lever 14- Rotary Device

15- Panel Switch 1 16- Panel Switch 2 17- Power-CAN 18- Body-CAN 19- PL-CAN 21- IF-CAN 22- Boost Temperature Sensor 23- Crank Speed Sensor 24- Cam Angle Sensor 25- Coolant Temperature Sensor 26- Torque Converter Oil Temper

ature Sensor

27- Torque Converter Input Shaft

Speed Sensor

28- Torque Converter Output

Shaft Speed Sensor

29- Transmission Intermediate

Shaft Speed Sensor 30- Vehicle Speed Sensor 32- Forward/Reverse Lever 33- Forward Position 34- Neutral Position 35- Reverse Position 36- Forward/Reverse Switch

TNFQ-02-02-203-2 ja

37- Forward/Reverse Selector

Switch

38- Pump Delivery Pressure Sen

sor 39- Torque Control Solenoid Valve 46- Sub Monitor 47- Key Switch 48- Hydraulic Oil Temperature

Sensor 50- GSM 64- MPDr. 75- Control Lever Lock Switch 88- Joystick Steering Selector

Switch

Torque Decrease Control While Digging

Purpose:

The torque decrease control while digging reduces the pump delivery ow rate and reduces the pump driving torque. Then, the engine torque can be utilized as the driving power. (Refer to "Matching Control While Digging"T2-2-16.)

TONFQ50-EN-00(28/02/2022)

T2-2-37

SECTION 2 SYSTEM

Group 2 Control System

Operation:

NOTE

The time when forward/reverse switch (36) is eective is explained as an example.

1. When all following conditions exist, MC (3) activates torque control solenoid valve (39).

• Torque Converter Speed Ratio: less than specied value (Reference: 15% or less)

• Forward/Reverse Lever (32) or Forward/Reverse Switch (36): Forward Position (33)

• Pump Delivery Pressure: High Pressure (Reference: 13 MPa or more)

NOTE

The torque converter speed ratio is calculated from the following equation.

J=K/L

J- Torque Converter Speed Ratio

K- Torque Converter Output Shaft Speed

L- Actual engine speed

2. Torque control solenoid valve (39) delivers the pilot pressure oil according to the signals to the regulator and reduces the pump delivery ow rate.

NOTE

Forward/reverse switch (36) is also equipped on machines mounted with the joystick steering system. Forward/reverse switch (36) on the joystick steering system side is shifted between operable and inoperable by joystick steering selector switch (88).

TONFQ50-EN-00(28/02/2022)

T2-2-38

2

1

75

32

33 34 35 88

36

33 34 35

48

37

15

14

17

19

18

16

9

PLCU

7

TCU

5

ECM

3

MC

4

13

11

10

64

46

50

21

38

25

24

23

22

26

27

29

28

30

6

8

39

47

SECTION 2 SYSTEM

Group 2 Control System

1- Accelerator Pedal 2- Accelerator Pedal Sensor 3- MC 4- Monitor Controller 5- ECM 6- Engine 7- TCU 8- Transmission 9- PLCU 10- Main Monitor 11- Column Display 13- Control Lever 14- Rotary Device

15- Panel Switch 1 16- Panel Switch 2 17- Power-CAN 18- Body-CAN 19- PL-CAN 21- IF-CAN 22- Boost Temperature Sensor 23- Crank Speed Sensor 24- Cam Angle Sensor 25- Coolant Temperature Sensor 26- Torque Converter Oil Temper

ature Sensor

27- Torque Converter Input Shaft

Speed Sensor

28- Torque Converter Output

Shaft Speed Sensor

29- Transmission Intermediate

Shaft Speed Sensor 30- Vehicle Speed Sensor 32- Forward/Reverse Lever 33- Forward Position 34- Neutral Position 35- Reverse Position 36- Forward/Reverse Switch

TNFQ-02-02-203-3 ja

37- Forward/Reverse Selector

Switch

38- Pump Delivery Pressure Sen

sor 39- Torque Control Solenoid Valve 46- Sub Monitor 47- Key Switch 48- Hydraulic Oil Temperature

Sensor 50- GSM 64- MPDr. 75- Control Lever Lock Switch 88- Joystick Steering Selector

Switch

Transmission Control (TCU)

The transmission control consists of the followings.

● Neutral Control

● Forward/Reverse Lever Priority Control

TONFQ50-EN-00(28/02/2022)

T2-2-39

● Manual Speed Shift Control

2

32

33 34 35

1

88

5251 5355 54

36

33 34 35

14

31

69

80

70

13

9 PLCU

47

4

64

11

10

46

50

21

19

17

76

78

7977

1 2 3

26

27

25

24

23

22

6

8

4

79

29

28

30

38

40

41

81

90

91

18

15

16

37

45

56

92

43

44

42

7

TCU

5

ECM

3

MC

● Automatic Speed Shift Control

● Downshift Control

● Rise Run Shift Prohibit Control

● Clutch Cuto Control

● Shift Holding Control

● Torque Converter Lockup Control

Transmission Control System Layout

SECTION 2 SYSTEM

Group 2 Control System

TNFQ-02-02-103-1 ja

TONFQ50-EN-00(28/02/2022)

T2-2-40

HITACHI ZW310-7 Technical Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

TONFQ50-EN-00

INTRODUCTION

To The Reader

Additional References

Manual Composition

Page Number

Trademark

Safety Alert Symbol and Headline Notations

Units Used

Symbol and Abbreviation

SYMBOL AND ABBREVIATION

CONTRASTING LIST OF PART NAME

Contrasting List of Part Name between Technical Manual and Parts Catalog

CONTENTS

GENERAL

Main Component (Overview)

Main Component

Electrical System (Overview)

Air Cleaner and Radiator Assembly

Radiator Assembly

Battery Box

Hydraulic Oil Tank

Fuel Tank

Drive Unit

Front Axle

Front Console

Panel Switch

Right Console

Operator's Seat and Joystick Steering System

Rear Console

Control Unit

Column Monitor

Engine

Aftertreatment Device

Fan Valve

Pump Device

Control Valve

Brake Valve

Brake Charge Valve/Combination Valve

Steering Valve

Ride Control Valve

2-Spool Solenoid Valve Unit

Emergency Steering Pump Unit

DEF Tank

DEF Supply Module

Joystick Steering Hydraulic Component

Joystick Steering Valve

Joystick Steering Solenoid Valve Unit

Steering Pilot Valve

Electrical Component

SYSTEM

Outline of Controller

Controller Control Comment on

CAN Circuit

Outline of Control System

Engine Control (ECM)

Engine Control System Layout

Engine Protection Control

Accelerator Pedal Control

Auto Warming-Up Control

Engine Torque Idle Speed-Up Control

Forward/Reverse Selection Speed Limit Control While Traveling

Engine Speed Limit Control without Load

Matching Control While Digging

Speed Limit Control with Power Mode OFF

Auto Power Up Speed Control

Overheat Prevention Speed Limit Control

Aftertreatment Device Manual Regeneration Control

Engine Over Speed Limit Control

Engine Max. Speed Limit Control at Stroke End Stall and Front Relief

Engine Torque Limit Control During Acceleration

Pump Control

Pump Control System Layout

Base Torque Control

Torque Decrease Control While Digging

Transmission Control (TCU)