MACK PI-CHU, AN-CXU, GR-GU, TD LR, TE-MRU Service Manual

BODY BUILDER INSTRUCTIONS

Mack Trucks

Power Take-off (PTO)

PI / CHU, AN / CXU, GR / GU, TD

Power Take-off (PTO)

This information provides specifications for Power Take-off (PTO) applications in MACK vehicles.

Note: We have attempted to cover as much information as possible. However, this information does not cover all the unique variations that a vehicle chassis may present. Note that illustrations are typical but may not reflect all the variations of assembly.

All data provided is based on information that was current at time of release. However, this information is subject to change without notice.

LR, TE / MRU

Section 9

Please note that no part of this information may be reproduced, stored, or transmitted by any means without the express written permission of MACK Trucks, Inc.

Contents:

• “Overview”, page 3

• “General”, page 3

• “PTO Speed Functions”, page 4

• “Power Take-off Types”, page 7

• “mDrive Power Take-off”, page 9

• “Transmission-mounted PTO”, page 9

• “Transmission-mounted PTO”, page 10

• “Power Take-off (PTO), Installation (mDrive)”, page 15

• “Rear-mounted Engine PTO”, page 28

• “Front-mounted Engine PTO”, page 35

• “Hydraulic Pumps”, page 40

Mack Body Builder Instructions PI / CHU, AN / CXU, GR / GU, TD, LR, TE / MRU

USA141851969 Date 3.2018 Page 1 (137)

• “Supplier PTO/Pump Literature”, page 73

• “PTO Programming”, page 83

• “Parameter Programming”, page 92

• “General”, page 92

• “Programming”, page 94

• “Examples”, page 111

• “Trash Packer – PTO Single Speed Control”, page 111

• “Trash Packer – PTO with Secondary Enable”, page 112

• “Hand Throttle PTO 0 as Low Speed “Cruise Control””, page 113

• “Concrete Pumper - Driveshaft PTO with Limits”, page 114

• “Line Painter – PTO Road Speed Limit”, page 115

• “Line Painter – PTO Set Road Speed”, page 116

• “Dump Truck – Configuring “Hand Throttle” PTO 0”, page 117

• “Trash Container Truck – Limits for PTO”, page 118

• “Two Speed Control for Driveshaft PTO”, page 119

• “Regeneration in PTO Mode”, page 120

• “Rolling Start for mDrive: New Generation AMT-F ”, page 124

• “mDrive Auto Neutral”, page 125

• “Standard Settings”, page 125

• “Installation of Single and Double PTOs on mDrive Generation F Transmissions ”, page

132

• “Split Shaft PTO Functionality with mDrive HD Transmissions”, page 136

USA141851969 Date 3.2018

PI / CHU, AN / CXU, GR / GU, TD, LR, TE / MRU

Release

Page 2 (137)

Overview

General

Auxiliary equipment require power take-offs, either when the truck is stationary or when it is in motion. Various power take-off alternatives can be chosen, depending on the bodywork.

The work is generally carried out by equipment which is powered by a hydraulic motor. The hydraulic motor, together with a pump and associated equipment, form the basis of the hydraulic system. The pump, which provides the hydraulic pressure and flow to the motor, is the heart of the hydraulic system.

All power take-offs covered by this chapter are available factory installed. Some variants can also be ordered. It is important to design an optimum hydraulic system, and to specify the correct pump size to provide sufficient oil flow and prevent overloading of the power take-off.

Power Take-off

There are a number of different power take-off variants available, with single or double outlets. The power take-off is supplied with one of several output drives, keyed shaft, SAE drive flange or internal splined DIN.

Power take-offs are classified into two family variants: Clutch dependent and Clutch independent

Abbreviations

PTR

PTRD

REPTO

EPTT

HPE

Single power take-off transmission, rear mounted (Power take-off Transmission Rear). All are rearfacing.

Double power take-off transmission, rear mounted (Power take-off, Transmission, Rear mounted, Double).

Flywheel mounted power take-off (Rear Engine PTO). This variant is available with rear-facing flange or opening for hydraulic pump located at one o' clock position.

Maximum permitted torque on engine power take–off (Engine Power Take–off Torque)

Hydraulic pump mounted to an engine power take–off (Hydraulic Pump Engine mounted).

Mack Body Builder Instructions PI / CHU, AN / CXU, GR / GU, TD, LR, TE / MRU

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PTO Speed Functions

For the purposes of this manual, PTO (Power Take–off) is a function to maintain engine speed regardless of engine load. Think of it as cruise control for the engine - only instead of maintaining a steady vehicle speed, it is maintaining engine speed. It is most often used to provide increased steady engine speed when operating auxiliary equipment such as hydraulic pumps or compressors. The term "PTO" has come to mean both the function of maintaining constant engine speed during use of auxiliary equipment, as well as a term for the auxiliary equipment itself.

There are two types of PTO engine speed control used in Mack trucks:

Electronic Hand Throttle

(EHT/PTO 0) This type of PTO is standard equipment; it is initiated and controlled using the cruise control "ON/

OFF", "SET / Decel or Resume / Accel switches. Manufacturers refer to this function by different names - Mack calls it "Electronic Hand Throttle" (EHT), even though some of the parameters for programming this function will refer to it as "high idle". (Note that in the North American market, the term "high idle" usually refers to the maximum possible engine speed under no-load conditions).

"Physical" or "Wired" PTO

How each of these different PTO functions operate will depend upon the installed engine. For Mack engines, the PTO functions are split between the Engine ECU and VECU.

This type of PTO is most commonly associated with the engagement of engine- or transmission"Wired" PTO driven accessories, where the user wishes to "remotely" activate the engine speed control function. It is usually accomplished by wiring the auxiliary equipment to the PTO function controller (VECU, BBM ECU, or Transmission ECU) so that engaging one will automatically activate the other.

Notes

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Body Builder Module

PTO Control functionality, which is in the Transmission Control Unit (TCU) in AMT-D, has been removed in AMT-F. Therefore, this functionality needs to be provided in the vehicle through the VECU for single PTO and with Body Builder Module (BBM) when using Dual PTOs.

• This is added to support dual PTOs with

the AMT-F and AMT-FX transmissions.

• MACK BBM is located on the doghouse

BIW with a mounting plate, under the plastic doghouse cover not visible to the driver.

Notes

W9115439

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PTO Functions with the MACK MP7 and MP8

A "PTO" icon will appear in the instrument cluster only when 'Remote' ('Wired') PTO is engaged.

Electronic Hand Throttle PTO

The VECU reads the cruise control PTO switch status, and commands the engine into PTO mode when conditions are right. These conditions are program in the VECU and might include a maximum vehicle speed, park brake set or not, etc.

The engine PTO 'set speed' is selected by either pressing the cruise control "RESUME" button, or by using the accelerator pedal to get the desired engine speed and pressing one of the cruise control "SET" buttons (either SET / Decel or Resume / Accel). Once the PTO function is active, the SET / Decel or Resume / Accel buttons can be used to adjust the PTO engine speed (within limits).

Physical or Remote/Wired PTO

This PTO function is activated by applying an external signal to a dedicated PTO input pin on the VECU. The set speed can be adjusted using the cruise control SET / Decel or Resume / Accel buttons, as above.

The Mack VECU allows for up to 4 PTO speed controls plus the PTO (EHT) without the use of a BBM. Each PTO can be independently selected and controlled by separate speed settings as well as independent engagement and disengagement requirements.

A sub-function of the 'wired' PTOs in the VECU is the ability to activate PTO "outputs". Traditionally, the auxiliary device (PTO pump, bypass solenoid, etc.) is wired so as to be activated by the same switch which initiates the engine speed control function. This means that the hardware will be engaged whenever the switch is on, even if the engine speed is not being controlled. There also is no protection against an input switch that has been accidentally activated.

With the mDrive transmission the PTO "Output Control" function of the VECU and BBM ECU, it is possible to prevent engagement of the auxiliary equipment until certain conditions are met - park brake set, engine speed within a certain range, etc. This is accomplished by controlling the auxiliary equipment with the VECU, instead of directly from a switch. The ECUs still read the switch input, though, and will only allow the auxiliary device to engage when conditions are right.

Notes

Mack Body Builder Instructions PI / CHU, AN / CXU, GR / GU, TD, LR, TE / MRU

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Power Take-off Types

Clutch Dependent Power Take-off

Clutch dependent power take-offs are designed to work when the truck is parked. Common applications are dump trucks, mobile cranes, tank trucks, etc. They are mounted on the transmission and stop rotating when the clutch pedal is depressed.

Note: The clutch pedal must be depressed (if equipped), to engage or disengage the power take-off.

• PTR-XX

• PTRD-XX

T4006562

PTR-FL

Clutch Independent Power Take-off

A clutch independent power take-off is mainly used when work is to be done when driving. Refrigerated, hook lifts, concrete mixer, snow plows/sand spreaders, etc. They are designed to be installed either on the front of the engine or the flywheel housing.

Rear Engine Power Take-off (REPTO)

An engine mounted power take-off is mounted on the rear of the flywheel housing.

MP7 and MP8

On the MP7 and MP8 engines the power take-off is ordered separately or ordered when the vehicle is built.

• PTR-DIN (DIN5462/ISO7653 connection)

• PTR1300 (flange SAE1300)

• PTR1400 (flange SAE1400)

• PTR-DIN + HPE-XXX

(Engine power take–off together with engine mounted hydraulic pump)

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PTR-DIN

T9008395

W4002977

Rear-mounted Engine PTO with Flange SAE 1410/ ISO 7647

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Transmission-mounted PTO

mDrive Power Take-off

The mDrive is an automated manual transmission. When you have the PTO engaged and put the transmission into gear by pressing the service brake and selecting D on the shift pad, the TECU commands the clutch to be released and engages the countershaft brake. This stops the countershaft, which in turn stops the rotation of the PTO when the driver releases the brake pedal and applies the throttle. The clutch will re-engage and the countershaft will start to rotate along the PTO.

When the driver stops the truck, the clutch will disengage if “R” is selected. The transmission will shift into reverse and when the driver releases the service brake and depresses the throttle, the clutch will re-engage and the PTO will start to spin again.

This is something any manual transmission would require, but the clutch would be depressed and released by the driver.

The mDrive with transmission–mounted PTO may not be the solution for the Roll Off Chassis. The REPTO (MP only) unit is best suited for this application, where the truck is moved and uses the hydraulics at the same time. (This was possible with an Allison Transmission).

If the driver wants to operate the PTO while driving the truck, the transmission will only be able to operate in the starting gear that was selected. Depending on the vehicle options and starting gear selected, the maximum vehicle speed is usually around 6 mph.

Speed Ratios for mDrive Transmission Mounted PTOs

Power take-off

Type

PTR-FL 35.3 0.93 1.18 0.73 0.93

PTR-DM 28.7 1.35 1.72 1.06 1.35

PTRD-F (Outer)

PTRD-F (Inner)

PTRD-D 44.1 1.65 2.10 1.30 1.65

PTRD-D1 57.3 1.65 2.10 1.30 1.65

PTRD-D2 (Outer)

PTRD-D2 (Inner)

1 Engine Speed: Transmission PTO Ratio (Example – 1:1.65)

Weight (lb)

41.9

70.5

mDrive Overdrive mDrive Direct

Low High Low High

Single

Double and Triple

1.65 2.10 1.30 1.65

0.77 0.98 0.60 0.77

1.65 2.10 1.30 1.65

0.77 0.98 0.60 0.77

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Transmission-mounted PTO

MACK mDrive, AMT

This information is meant as an aid to identify transmission PTO options available with the mDrive Transmission.

The following table shows the available PTO's with installation kit part numbers and required software accessory kits.

PTO Type PTR-FL PTR-DM PTRD-F PTRD-D PTRD-D1 PTRD-D2

Part Number 20997251 20997415 20796430 20796008 20796225 20796355

Installation Kit

Number

Software Ac-

cessory Kit

AMT-D

Software Ac-

cessory Kit

AMT-F

Notes

85134988 85134988 85134988 85134988

85137335 85137335 85139651 85139652 85110254 85140256

85137335 85137335 85137335 85137335 85151840 85151840

85134988 &

85132964

85134988 &

85132964

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mDrive Transmission Mounted PTOs

PTO Connection

Type Type Dimension

PTR-FL Flange SAE1300 Counter clockwise

PTR-DM Direct DIN5462

Flange (Outer)

SAE1400

PTRD-F

Direct (Inner)

DIN5462

Direct (Front)

PTRD-D

DIN5462

Direct (Rear)

Direction of

when facing back

Clockwise when

facing back of

Counter clockwise

when facing back

Counter clockwise

when facing front

Clockwise when

facing back of

Rotation

of engine

engine

of engine

engine

Max. Horsepower

Max. Torque ft-lb

(KW)

134 (100) 443 (600)

188 (140) 642 (870)

(Nm)

Direct (Front)

DIN5462

PTRD-D1

PTRD-D2

Flange (Rear)

Direct (Front)

Flange (Outer)

Flange (Inner)

SAE1400

DIN5462

SAE1300

SAE1400

Power Take–off (PTRD-D2) Maximum Torque

642 ft-lb (850) is the Maximum PTO Torque for PTRD-D2

Inner shaft ft-lb (Nm) Outer shaft ft-lb (Nm) [sum of front and rear PTO]

738 (1000) 148 (200)

Counter clockwise

when facing front

of engine

Clockwise when

facing back of

engine

Counter clockwise

when facing front

of engine

Clockwise when

facing back of

engine

Counter clockwise

when facing back

of engine

Max power inner

and outer shafts

must not exceed

188 hp (140)

Max Torque 642

ft-lb (850)

See table below.

664 (900) 221 (300)

516 (700) 295 (400)

369 (500) 369 (500)

203 (275) 443 (600)

48 (65) 516 (700)

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Engine PTO in combination with AMT

When using the mDrive gearbox, the engine power take-off can be engaged during driving (depending on parameter setting) but exceeding the maximum torque (shown in the table below) can cause problems during gear shifting. For this reason it is recommended that equipment shall be designed so that the torque limits in the table below are not exceeded during driving.

Engine Maximum Torque Horsepower (Nm) While Driving

MP7

MP8

PTO Installation Kit

Installation Kit 85134988 includes parts required for installing types PTR-FL, PTR-DM, PTR-DH, PTRD-F, PTRD-D. For installing PTRD-D1, PTRD-D2 also requires 85132964.

Pump

See Tools and other Helpful Links section in Body Builder Manual for pump selection and information.

http://www.macktrucks.com/parts-and-services/support/body-builders/tools/

148 (200)

221 (300)

Notes

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W2122051

PTR-FL PTRD-D

W9122052 W4003061

PTR-DM PTRD-D1

W4003060

W4003059 W4111374

PTRD-F PTRD-D2

PTO Drive Position on the Double and Triple PTO Housings

1 PTO # 1

2 PTO # 2

3 PTO # 3

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Diesel Exhaust Fluid (DEF) Cooling Lines, Side Mounted PTO

This kit is being released in order to provide a solution for customers requiring a side mounted PTO on mechanical transmissions. Currently, if a PTO is mounted on the transmission it will interfere with the urea cooling lines that are routed down the right side of the frame. This kit allows the customer to remove the hard piping associated with the urea cooling lines and replace them with flexible hoses that prevents the previously mentioned interference.

Mechanical Transmission PTO Cooling Line Routing Kit

MP8 Contents 85124281 MP7 Contents 85124282

Part Number Quantity Part Number Quantity

21477961 2 21477961 1

20437238 3 21479099 1

965541 2 20437238 2

965559 3 965541 2

965560 1 965559 3

981664 6 965560 1

946440 5 981664 6

948645 5 946440 5

946329 3 948645 5

971098 3 946329 3

20805109 2 971098 3

984992 2 20805109 2

984992 2

W2037255

Cooling Line Routing

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Power Take-off (PTO), Installation (mDrive)

PTO kit 85134988 includes transmission drive parts, a solenoid valve, and a switch for a single PTO. PTO kit 85132964 includes an additional solenoid and switch valve for dual PTO’s. Both kits are required for dual PTO’s.

1. Raise and support the rear of the vehicle.

Note: Lift the rear of the truck until the back of the transmission has been raised 76-89 mm (3-3.5 in) to minimize transmission fluid loss.

2. Drain the air system.

3. Drain the mDrive transmission air supply tank.

Note: This tank is equipped with a pressure protection safety valve and will not drain with the rest of the air system.

4. Remove the PTO mounting surface block off plate from the transmission range housing.

Note: Position a drain pan to capture lost transmission fluid.

W4079510

1 Snap Ring

2 Thrust Washer

5. Assemble the PTO drive shaft, bearing, thrust washer and snap rings.

Note: Using a brass drift, gently drive the bearing into place striking only the inner race. Reposition the drift with each strike, rotating around the bearing.

Notes

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6. Pack the PTO drive shaft bearing with grease. Note: Use a synthetic based grease such as MACK part number 1077790 or equivalent.

W4003016

7. Install the PTO drive shaft assembly in the transmission.

Note: Once positioned in the transmission, it may be necessary to gently tap the shaft in. Use a plastic or rubber faced hammer.

Note: The bearing is seated when the snap ring on the outside of the bearing touches the mating groove on the transmission.

8. Lubricate the PTO drive shaft pilot bearing.

Note: Use a synthetic based grease such as MACK part number 1077790 or equivalent.

9. Install the PTO drive shaft pilot bearing.

W4003017

10. Apply a bead of silicone sealant on the PTO mounting surface.

Note: Only use silicone to seal the PTO mating surfaces. Do not use gaskets or O-rings.

Note: Clean the PTO mating surface on the transmission prior to applying the silicone.

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11. Install the air line bracket on the left upper PTO mounting bolt. Install the PTO and tighten the mounting bolts to 85 ± 5 (30 ± 4 ft/lb).

W4003020

12. Remove the PTO oil supply line plug from the back side of the transmission oil filter housing.

Note: Use a copper gasket to seal the fitting.

W4003018

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13. Connect the PTO oil feed line to the oil port. Tighten the line.

W4003018

14. Locate the PTO solenoid wiring harness connectors tied to the transmission wiring harness on top of the transmission. Cut tie straps as needed to free the harness for use.

Note: The wiring tags should read PTO1 and PTO2 at the connectors.

15. For a single PTO, install two quick connect air fittings and one pipe plug into the PTO solenoid. For dual PTO’s , install an O-ring between solenoids in place of the pipe plug.

Note: The supply line fitting should accept a 9.5 mm (3/8 in) air line, and the outlet fitting should accept a 6.35 mm (1/4 in) air line.

W9123394

1 Plug for single or O-ring for dual

2 Outlet fitting 1/4”

3 Supply line 3/8”

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16. Install the PTO solenoid or solenoids to the bracket and tighten the fasteners to 20 ± 3 (15 ± 2 ft/lb).

W4003027

17. Remove the two, top left range housing mounting bolts.

18. Install the bracket using the range housing bolts. Tighten the bolts to 110 ± 10 (81 ± 7 ft/lb).

W4003019

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19. Connect PTO1 wiring harness to the solenoid.

Note: The wiring tags should read PTO1 and PTO2 at the connectors.

20. Install a 90° air line quick connect fitting into the PTO.

Note: The fitting should accept a 6.35 mm (1/4 in) air line.

21. Install a 6.35 mm (1/4 in) inch air line from the solenoid to the PTO.

Note: Route away from moving parts and secure to mounting bracket with tie straps.

22. Remove the plug from the available 9.5 mm (3/8 in) inch air line port on the pressure protection manifold, found on the left inner frame rail. Insert the air line and route it to the solenoid inlet 3/8 in port.

Install the solenoids. Install the 9.5 mm (3/8 in) air supply line to the pressure protection manifold and then connect it to the solenoid.

Note: Route the line away from any moving parts and secure using tie straps.

W4003022

W9123652

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23. Pressurize the air system and check for leaks.

Note: If any leaks are found, drain the air tank and repair the leak. Re-test until no leaks are found.

24. Remove the supports and lower the vehicle.

25. Fill the transmission with new MACK approved oil.

Note: Fill the transmission until the fluid level is between minimum and maximum of the sight glass.

Note: Do not reuse old oil from the mDrive transmission. Always use new oil when filling.

Note: 1–2 L (1–2.1 qt) of fluid may be lost during the installation.

Silver Drain Plug 85146531, SAE50 mDrive Heavy Duty

Brass Drain Plug 9853–120551, 75W-80 mDrive Standard

26. Remove the bussed electrical center (BEC) cover in the cab.

27. Check for a 15 amp fuse in fuse slot F8 and a 10 amp fuse in fuse slot F17 of the BEC. Install fuses if missing.

W9115436

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28. Install the BEC cover.

29. Remove the dash switch blank from the first blank switch position 1 through 3 on switch panel.

Note: Switch position 3 is the default position for the PTO switch, but switch position 1 or 2 should be used if blank. The PTO switch connector is in the cab wiring harness and is located behind this panel.

W8061184

30. Install the PTO switch (82280522) in position 1, 2, or 3, depending on which location is the first available blank position.

31. Using the scan tool, run accessory kit and program the transmission control module (TCM) with the appropriate software for a single PTO. Contact the help desk for further assistance.

Note: The appropriate software is dependent upon how many solenoids are being used to actuate the PTO (single or dual solenoids), not the outputs on the PTO.

Note: When installing an mDrive Transmission mounted PTO, contact MACK Tech Support 1–800–888–2039 to secure the correct software for the Transmission Electrical Control Module (TECU).

32. After the TCM has been programmed with its software, it is necessary to perform the “Transmission and Clutch Calibration” using the scan tool.

33. Perform PTO parameter programming. For more information, refer to the “PTO Programming” bulletin found in the electrical section of the Body Builders Manual.

Note: It will be necessary to change the vehicle electronic control unit (VECU) default parameter for PTO position mounting from engine1 to transmission1.

36. Run the vehicle and re-check the transmission fluid level. Top off the transmission as needed so the fluid level is between minimum and maximum of the sight glass.

Note: The PTO shares the transmission fluid for lubrication. The PTO will retain about 0.8 qt (0.75 L), of transmission fluid after initially being run. Always top off the transmission fluid after installing a new PTO.

Note: For PTO 2 Switch an overlay harness may be required. Contact your local MACK dealer for parts.

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Rear-mounted Power Take-off Description and Operation Description

There are two types of MACK T300/T200 series rear-mounted PTO units, direct drive and optional ratio. Both PTOs are driven by a quill shaft which engages the transmission front countershaft. Therefore, the PTO output shaft speed is fixed at the pre-set percent of engine speed, regardless of which transmission gear is selected. Engagement and disengagement of both PTOs is accomplished by a field-fabricated control arrangement (rod or cable) or by a MACK air-operated PTO control. In either case, engagement is by means of a sliding clutch arrangement. For both units, the vehicle must be stopped and the clutch disengaged before the PTO can be engaged.

Direct Drive PTO

A direct drive PTO can be installed in any of the rear countershaft positions — upper left, upper right or lower center. Depending on which position the PTO unit is mounted, it affects whether the unit mounts upright or is slanted right or left. This positioning affects draining and filling units with lubricant. Direct drive PTO draining and filling procedures will be covered in the MAINTENANCE section of this manual.

W0040845

1 Upper Left Location

2 Upper Right Location

3 Lower Center Location

The output speed (as a percentage of engine speed) of the direct-mounted PTO depends on which T300/T200 transmission it is mounted on and is fixed at that percentage, regardless of which transmission gear is selected. Refer to the following chart for PTO speed percentage of engine rpm as related to transmission.

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Power Take-off

Rear-mounted

Upper Left T2050/T305 84 735 (997) Opposite of Engine

Upper Right T2060/T306 84 735 (997) Opposite of Engine

Lower Center T2060A/T306G 70 735 (997) Opposite of Engine

MACK Transmission

PTO Speed to Engine

RPM Percentage

Output Torque Rat-

ing ft-lb (Nm)

Rotation Same as or

Opposite Engine

T2070, B, D/T307M/

307

T2080, B, D/T308M/

308

T2090/R/L/LR T309/L/

LR/T310

T2100 65 735 (997) Opposite of Engine

T2110B 65 735 (997) Opposite of Engine

T2130, T2180, A, B 70 735 (997) Opposite of Engine

T313/L/LR/L21/LR21/

T318/L/LR/L21/LR21/

TM308/TM309 70 735 (997) Opposite of Engine

TM308M/TM309M 70 735 (997) Opposite of Engine

T310M/ME/MLR 70 735 (997) Opposite of Engine

84 735 (997) Opposite of Engine

70 735 (997) Opposite of Engine

Rear-mounted PTO in-Service Guidelines

In the past, transmission PTO applications were considered for intermittent service, which means run for several minutes and then shut down and allowed to cool before reuse. More and more, varied applications are causing transmission PTOs to be used continually, or for longer periods of time.

The following recommendations are for MACK rear-mounted PTO applications:

• Intermittent Service — The PTO unit is operated, under load, for only 5 minutes out of every 15 minute time period.

• Continuous Service — The PTO unit is operated, under load, for more than 5 minutes straight. Units that are operated

for more than 5 minutes in a 15 minute time period are also considered continuous service.

Rear-mounted PTO units expected to operate under the continuous service guideline, must have the torque or horsepower ratings reduced by 30%, to prevent premature wear of the unit.

Mack Body Builder Instructions PI / CHU, AN / CXU, GR / GU, TD, LR, TE / MRU

USA141851969 Date 3.2018 Power Take-off (PTO) Page 24 (137)

Rear-mounted PTO Component Locations

Direct Drive RMPTO Cross-Sectional View

1 Quill Shaft Assembly

2 PTO Cover Assembly

3 PTO Output Shaft Assembly

W0040851

W0040849

Optional Ratio RMPTO Cross-Sectional View

1 Quill Shaft Assembly

2 PTO Cover Assembly

3 Output Shaft Assembly

4 PTO Housing Assembly

Mack Body Builder Instructions PI / CHU, AN / CXU, GR / GU, TD, LR, TE / MRU

USA141851969 Date 3.2018 Power Take-off (PTO) Page 25 (137)

SAE Flanges

W4002386

Flange SAE 1400

Notes

W4002387

Flange SAE 1300

Mack Body Builder Instructions PI / CHU, AN / CXU, GR / GU, TD, LR, TE / MRU

USA141851969 Date 3.2018 Power Take-off (PTO) Page 26 (137)

Optional Ratio PTO

The optional ratio PTO for the T300/T200 series transmission is available only in the lower center position. Additionally, this PTO is available only on the following transmission models, the T2110B, T2180A, T310ME, T313L21/T318L21, T313LR21/ T318LR21, and T31321/T31821. Only these transmissions are built with the dual-tapered roller bearing output housing which allows space for the drive yoke to fit past the PTO unit.

This optional ratio PTO is available in three ratios, all as a percentage of engine speed and is fixed at that percentage regardless of which transmission gear is selected. Refer to the chart below for PTO speed percentage of engine rpm as related to transmission.

Power Take-off

Rear-mounted Low-

er Center

Notes

MACK

Transmission

T2110B

T2180A, T310ME,

T31321/L21/LR21,

T31821/L21/LR21

PTO Speed to En-

gine RPM

Percentage

96 126 143

103 136 154

Output Torque Rat-

ing ft-lb (Nm)

390 (529) 298 (404) 262 (355)

364 (494) 276 (374) 244 (331)

Rotation Same as or

Opposite Engine

Same as Engine

Mack Body Builder Instructions PI / CHU, AN / CXU, GR / GU, TD, LR, TE / MRU

USA141851969 Date 3.2018 Power Take-off (PTO) Page 27 (137)

Rear-mounted Engine PTO

Trucks used for certain applications, such as cement mixers or dump trucks, may be equipped with a rear—mounted engine PTO (REPTO). PTOs of this type are installed on the rear of the engine, and are driven by the crankshaft. They are intended for use when the vehicle is moving or stationary.

REPTOs have been designed to accomplish a number of performance-related objectives:

• They have eliminated unnecessary parts (e.g., additional Front-mounted PTO equipment).

• They deliver efficient, clutch independent power.

• They allow specification of a lengthened wheelbase without exceeding overall length restrictions.

Example: two trucks with the same frame length must meet the same overall length of 10 m (40 ft). The truck with a front-engine PTO requiring a hydraulic pump in front of the engine (or bumper) will limit the wheelbase approximately 46 – 53 cm (18 – 21 in) compared to the vehicle with REPTO. This results in an increase in payload under the federal Bridge Law of 545 – 680 kg (1200 – 1500 lb).

This performance is possible because REPTOs are designed as an integral bearing housing that is mounted on the right, rear of the engine.

Note: The REPTO rotates in the same direction as the engine.

Note: The REPTO access hatch is tied to the REPTO variant. Whenever a REPTO is requested the access hatch is pro-

vided. Therefore, the customer does not need to request the hatch.

W8116059

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Benefits of REPTO include:

• Eliminate the need for extended frame or bumper.

• Permits shorter hydraulic lines.

• Simplifies maintenance (REPTO need not be removed for clutch service)

• Eliminates need for modification to radiator and radiator supports for PTO shaft clearance.

REPTOs permit the operator to engage or disengage the PTO even when the vehicle is moving. Unlike transmissionmounted PTOs, REPTOs are dependent only on the engine.

Rear Engine-mounted PTO with Flange SAE 1410/ ISO 7647

Related: Engine Package (101), Intermediate Crossmember (OA), Cab Suspension (2D)

Option T1-A1 is a clutch independent, rear-mounted, engine power take-off with a SAE1300/1400 flange connection for shaft driven accessories. The power take-off consists of a bearing housing that is mounted on the right rear side of the engine gear train. It is suited to types of transport in which the power take-off must be clutch independent. This means that the power is taken directly from the engine. The power take-off can operate both when the vehicle is in motion and when it is stationary, resulting in high vehicle productivity.

W4002977

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Rear Engine Mounted Power Take-off

Speed ratio: 1:X.x (1: = engine, X.x = power take-off)

Engine Speed ratio Direction of rotation

MP7 1:1.08

MP8 1:1.26

Max permissible torque ft-lb (Nm)

< 3 mph (5 km/h) 740 (1003)

> 3 mph (5 km/h) 480 (651)

> 3 mph (5 km/h) 740 (1003)

1 Counter clockwise when facing back of engine

2 The engagement of the hydraulic pump must not give any pressure peaks exceeding the rated pressure.

Note: Low stiffness of the prop shaft and big inertia on the pump will give low resonance frequency, which can be triggered by the frequency in the engine. The engagement time has to be so long that no pressure peaks will occur, and the best way to verify this is to measure the pressure close to the pump.

Resonance Frequency

CAUTION

The minimum torsional resonance frequency is 300 Hz for the system propeller shaft to PTO pump. Failure to not follow this may cause severe engine component damage.

Resonance frequency (f) for a propeller shaft driven PTO is calculated as:

f = resonance frequency (Hz)

k = stiffness of prop shaft and coupling(s) (Nm/rad)

J = hydraulic pump and coupling mass moment of inertia (kgm2)

Example:

k = 2,8 x 105 Nm/rad

J = 0,05 kgm2

Mack Body Builder Instructions PI / CHU, AN / CXU, GR / GU, TD, LR, TE / MRU

USA141851969 Date 3.2018 Power Take-off (PTO) Page 30 (137)

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