Kubota U17-3 Alpha Workshop Manual

WORKSHOP MANUAL

KUBOTA EXCAVATOR

U17-3

Code No.97899-61952

Record of Revisions

Symbol	Date	Main Revised Points & Corrective Measures	Person-in-charge
	Aug. 2008	Maintenance intervals EU - version revised.	I. Okae

1

Oct. 2008	Correction of descriptions on:		I. Okae
	1.	Engine model name for EU - version
	2.	Retractable track frame

2

3

4

U17-3α is the model name of EU - version

U17/U17-3 is the model name of KTC, KCL and KTA - version

CONTENTS

I.GENERAL

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-1

II. MACHINE BODY

•Mechanism Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II-M-1

•Service Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II-S-1

III. ENGINE

•Mechanism Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . III-M-1

•Service Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . III-S-1

IV. HYDRAULIC SYSTEM

•Mechanism Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IV-M-1

•Service Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IV-S-1

V. ELECTRICAL SYSTEM

•Mechanism Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V-M-1

•Service Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V-S-1

WSM U17-3α/U17-3/U17

I. GENERAL

I. GENERAL

A. BODY AND ENGINE IDENTIFICATION MARKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-3

B. SAFETY PRECAUTIONS FOR SERVICING, DISASSEMBLY AND REASSEMBLY . I-S-5 a. Safety Measures Before Starting Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-5 b. Safety Measures During Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-5 c. Preparation for Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-6 d. Precautions for Disassembly and Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-6

C. IMPORTANT SAFETY PROCESS AND CRITICAL FUNCTIONAL PROCESS . . . . . I-S-7 D. IMPORTANT INSPECTION ITEMS AFTER REASSEMBLING. . . . . . . . . . . . . . . . . . I-S-9 a. Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-9

E. MAINTENANCE INTERVALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-15 a. EU-version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-15 b. PP (KTC, KCL)-version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-17 c. KTA-version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-19 d. Hydraulic Oil Check for Machines with Hydraulic Breakers . . . . . . . . . . . . . . . . . . I-S-20 e. Maintenance Items. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-21 f. Troubleshooting for Operators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-23 g. Periodic Replacement of Important Component Parts. . . . . . . . . . . . . . . . . . . . . . I-S-24 h. Recommended Oils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-25 i. Lifting Capacity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-26

F. PRODUCT INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-31 a. U17-3α Development Concept. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-31 b. Why Minor Change? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-31 c. Quick Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-32 d. Major Sales Feature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-33 e. Specifications Comparison. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-S-34

1

1

I-S-1

		WSM U17-3α/U17-3/U17	I. GENERAL

I-S-2

WSM U17-3α/U17-3/U17

I. GENERAL

A. BODY AND ENGINE IDENTIFICATION MARKS

If trouble occurs during use, or servicing is necessary, contact your dealer. Pass on your machine model, engine type and serial number to them.

Example: S/N 10001

No.	Items	Contents
1	MODEL	U17-3α
2	SERIAL No.	10001
3	MASS	1650
4	MAX, DRAW BAR PULL	32.3
5	POWER	11.6
6	MAX,VERT,LOAD	2.7
7	PRODUCT IDENTIFICATION NUMBER	>JKUU0173*01S10001<
8	MANUFACTURED YEAR	2008
EU-version
No.	Items	Contents
1	Machine model	U17-3α
2	Serial No.	10001
3	Engine No.
4	PRODUCT IDENTIFICATION No. >JKUU0173*01S10001<

Name plate: Code No. RA018-57721

I-S-3

WSM U17-3α/U17-3/U17

I. GENERAL

(1) Machine serial number

(1) Serial No.

(2)Engine serial number

The engine serial number is an identified number for the engine. It is marked after the engine model number.

It indicates month and year of manufacture as follows.

e.g. D902-8L001

“8” indicates year of 2008 and “L” indicates June. So, 8L indicates that the engine was manufactured in June 2008.

(1) Engine serial No.

Year of manufacture

	Alphabet or	Year	Alphabet or	Year
	Number		Number
	1	2001	F	2015
	2	2002	G	2016
	3	2003	H	2017
	4	2004	J	2018
	5	2005	K	2019
	6	2006	L	2020
	7	2007	M	2021
	8	2008	N	2022
	9	2009	P	2023
	A	2010	R	2024
	B	2011	S	2025
	C	2012	T	2026
	D	2013	V	2027
	E	2014

A: Engine Model Name and Serial Number

Month of manufacture

Month		Engine Serial Number
	0001	~ 9999	10000 ~
January	A0001	~ A9999	B10000 ~
February	C0001	~ C9999	D10000 ~
March	E0001	~ E9999	F10000 ~
April	G0001	~ G9999	H10000 ~
May	J0001	~ J9999	K10000 ~
June	L0001	~ L9999	M10000 ~
July	N0001	~ N9999	P10000 ~
August	Q0001	~ Q9999	R10000 ~
September	S0001	~ S9999	T10000 ~
October	U0001	~ U9999	V10000 ~
November	W0001	~ W9999	X10000 ~
December	Y0001	~ Y9999	Z10000 ~

I-S-4

WSM U17-3α/U17-3/U17

I. GENERAL

B. SAFETY PRECAUTIONS FOR SERVICING, DISASSEMBLY AND REASSEMBLY

Safety precautions for servicing

Most accidents during servicing arise from carelessness. Please remember that safety involves both the welfare of the employees and improved work efficiency.

Safety precautions for disassembly and reassembly

Machines must be disassembled and assembled efficiently and safely.

It is very important to thoroughly understand the construction and function of the machine, to make all appropriate preparations, and start operations according to the specified working procedures.

a. Safety Measures Before Starting Work

(1)Work clothes (2)Team work

1.Wear specified work cap and clothed. (Under no circumstances may workers wear undershirts only.)

Cuffs must be kept buttoned, and any tears must be mended.)

2.Wear safety shoes.

3.Do not wear cotton gloves when working on the internal section of engine, reduction gears or hydraulic units for repair or others, or when using a hammer. Wear leather gloves, however, when hoisting wires.

(2)Inspecting equipment and tools

1.Prepare equipment (cranes, fork lifts, tool, etc.) required for servicing and inspect for any problems before starting work.

2.Hammer heads (metal parts) must be firmly secured to their handles.

3.Check hosting tools (wire ropes, hoisting chains, etc.) before use.

(3)Set workshop in order

1.Secure appropriate space needed for disassembly.

2.Secure a clean, safe place for arranging disassembled parts.

3.Store volatile substances (gasoline, light oil, thinner, oily articles, etc.) in appropriate containers at selected locations to prevent fire hazards.

b.Safety Measures During Work

(1)Protectors

1.Wear goggles when using chisels for chipping.

2.Use appropriate protectors during welding.

3.Wear a helmet when working with a crane or at elevated locations.

I-S-5

1.When working with two or more people, divide the work and maintain close communication.

2.Crane work must be carried out using predetermined signals.

(3)Disassembly and assembly

1.Do not wear gloves when using hammers.

2.Use rods of the specified soft material for removing pins. Do not use a hammer as a pad.

3.Do not place fingers in holes when centering.

4.Heavy parts must be adequately supported before removing bolts.

(4)Cranes

1.Basically, use a crane for objects heavier than 44lb (20kg).

2.Crane operation and hoisting must be performed only by qualified personnel.

3.Pay careful attention to the center of gravity when hoisting, and do not stand under the lifted objects.

(5)Others

1.To work under a jacked-up carrier, be sure to place wood pieces underneath.

2.When charging batteries, make sure there are no open flames in the immediate vicinity.

3.All electric tools must be grounded.

4.Before welding the machine, remove the battery.

•When removing the battery, be sure to disconnect negative (-) cord first.

•When mounting the battery, be sure to connect the positive (+) cord first.

WSM U17-3α/U17-3/U17

I. GENERAL

c. Preparation for Disassembly

(1)Cleaning

Remove mud and dirt from the body before disassembly.

(2)Acceptance inspection

The machine must be checked before it is disassembled to record existing conditions, such as those listed below.

Model, serial number, and hourmeter reading

•Reason for repair and repair history

•Element stains

•Fuel and oil condition

•Parts damage *(Take photographs if necessary.)

(3)Equipment and tools

Prepare equipment, tools, cranes and parts storage racks as required.

d. Precautions for Disassembly and Reassembly

(1)Disassembly

1.Follow the specified disassembly procedures.

2.Make alignment marks to insure correct reassembly.

3.Arrange disassembled parts in an orderly way, and attach identification tags or put marks if needed.

(2)Reassembly

1.Clean all parts before assembly. Repair any scratches or dents. Take special precautions against dirt and dust.

2.Parts with rust-preventive coatings must be assembles only after removing the coating.

3.Separated parts must be correctly reassembled using alignment marks.

4.As a rule, use a press to reassembled bearings, bushing and oil seals. Use pads when using a hammer.

e.Maintenance

CAUTION

When adding oil and servicing:

1.Park the machine on a large, flat place.

2.Place the bucket and dozer on the ground.

3.Stop the engine

4.Move the attachment control lever and dozer lever to make sure the remaining pressure is relieved.

5.Draw out the starter key and check around the machine for safety.

Before starting the job, carefully read the Operational Manual in " ! Servicing Precautions" on the yellow pages.

f. Waste Disposal

WARNING

Do not carelessly throw away and burn waste materials. Such actions may lead to environmental pollution and punishment by local laws.

When disposing of waste:

*Let out waste fluid from the machine into a container.

*Do not let waste fluid flow on the ground as well as into a river, lake, marsh, and sea.

*Contact your dealer or a qualified industrial waste handler to treat (dispose of or incinerate) harmful waste materials. Those materials include waste oil, fuel, cooling water (anti-freeze), coolant, solvent, filters, batteries, rubber and other toxic substances.

I-S-6

WSM U17-3α/U17-3/U17

I. GENERAL

C. IMPORTANT SAFETY PROCESS AND CRITICAL FUNCTIONAL PROCESS

The following instructions are related to essential adhesives, important safety process S and critical func-

tional process A . Pay special attention in servicing these process. (Pay also close attention in reconnecting the electrical cables.)

1.Essential Adhesives

Screw adhesive type:

• Unless otherwise specified, use Three-Bond 1324 adhesive (medium-duty type).

Keep the screw threads free of oil and water.

Instantaneous adhesive:

•Use Three-Bond 1733 or Three-Bond 1741E adhesive. Keep the bond areas free of oil and water.

2.Important Safety Process S

1.Reconnecting the fuel hose (clearance, hose routes, clamps, etc.)

2.Electrical cabling (engine, instrument panal, controls, etc.) (wiring routes, clamps and couplers)

3.Important Critical Functional Process A

1.Setting up the travel wheel motor (tightening torque)

2.Reassembling the rotary joints (joint direction and shaft set-up)

3.Installing the swivel base bearing and the swivel motor (tightening torque)

4.Fitting the pump couplings (tightening torque)

I-S-7

		WSM U17-3α/U17-3/U17	I. GENERAL

I-S-8

WSM U17-3α/U17-3/U17

I. GENERAL

D.IMPORTANT INSPECTION ITEMS AFTER REASSEMBLING

1.Operate the Machine and Check for Unusual Noise and Vibrations.

2.Make Sure the Safety Decals and Wireharness Clamps Are in Their Specified Positions.

3.With the Machine Front in a Specified Posture, Check the Amount of Hydraulic Oil

Checking the oil level (For further datails, refer to the Operator’s Manual of each model.)

1)Park the machine on a level ground.

2)Make sure the hydraulic oil temperature is in the range of 10-30°C (50-86°F) and see if the oil level is within the specified zone of the oil level gauge.

3)Extend the track cylinder to Max. position.

4)Keep the machine front as shown as following posture.

Posture:Extend the rods of the arm and bucket cylinders to max. Place the bucket link on the ground, the offset swing at the center, and the dozer also on the ground.

Oil gauge (level)

Red circle	Some space needed
Specified	Leftward
machine posture	swinging

a. Piping

(1)General precautions

•Tighten the pipe socket to the specified torque. If too tight, the socket itself or a hydraulic component may get damaged. It too loose, an oil leak may result.

•In connecting a new hose or pipe, tighten its nut first to the specified torque and then turn it back (about 45°). Then tighten it again to the specified torque. (Do not this to the sealing tape-applied hose or pipe.)

•When disconnecting a vertical hose or pipe, separate its bottom connection first.

•In desconnecting and reconnecting the hose and pipe, be sure to use two wrenches. With one wrench, restrain the mating part to allow no twist.

•Check the mating connector’s sleeve and the hose’s taper for dust deposits and scratches.

•When the pipe socket has been tightened up, wipe the joint clean. Apply the maximum operating pressure 2 or 3 times to make sure there is no oil leak.

(2)Hydraulic hose

Check the hydraulic hose for too tight a connect or twist. * Excessively tight contact

Let’s suppose that a hose is in contact with another hose or other part. If the hose is pulled away by a force of 2 kg but still in contact, it means the contact is too tight.

I-S-9

WSM U17-3α/U17-3/U17

I. GENERAL

(3)Precautions in tightening the bolts and nuts

•Use bolts of specified length.

•Do not over tighten the bolts: Its threads may get deformed or the fixed part may get damaged. Do not undertighten the bolt either: It may get loose.

•In other words, tighten the bolt to the specified torque.

•Tighten the bolts and nuts diagonally for even tightness.

Nut

Joint body

Sleeve

R (Tapered thread)	Steel pipe	Union nut	Tapered thread
G (Straight thread)

I-S-10

WSM U17-3α/U17-3/U17

I. GENERAL

(4)Hose screw

		Tightening torque
			N·m
Thread size			kgf·m			Wrench size
			ft·lbf
(piping screw)						(reference)
	Union nut section			Taper thread
				section
	7.8 ~ 11.8 N·m			14.71 ~ 19.61 N·m		17 mm
1/8”	0.8 ~ 1.2 kgf·m			1.5 ~ 20 kgf·m
						0.67 in
	5.8 ~ 8.7 ft·lbf			10.85 ~ 14.47 ft·lbf
	24.5	~ 29.4		36.3	~ 44.1	19 mm
1/4”	2.5	~ 3.0		3.7	~ 4.5
						0.75 in
	18.1	~ 21.7		26.8	~ 32.5
	49.0	~ 53.9		49.0	~ 68.6	22 mm
3/8”	5.0	~ 5.5		5.0	~ 7.0
						0.87 in
	36.2	~ 39.8		36.2	~ 50.6
	58.8	~ 63.7		83.4	~ 88.3	27 mm
1/2”	6.0	~ 6.5		8.5	~ 9.0
						1.06 in
	43.4	~ 47.0		61.5	~ 65.1
	117.7 ~ 127.5			127.5	~ 147.1	36 mm
3/4”	12.0	~ 13.0		13.0	~ 15.0
						1.42 in
	86.8	~ 94.0		94.0 ~ 108.5
	137.3	~ 147.1		147.1	~ 166.7	41 mm
1”	14.0	~ 15.0		15.0	~ 17.0
						1.61 in
	101.3	~ 108.5		108.5	~ 123.0

Metric Size Hose

	Torque
Thread size	N·m
(piping screw)	kgf·m
	ft·lbf
M12 × 1.5	20	~ 30
	2.0	~ 3.1
	14.75	~ 22.13
M14 × 1.5	20	~ 30
	2.0	~ 3.1
	14.75	~ 22.13
M16 × 1.5	30	~ 50
	3.1	~ 5.1
	22.13 ~ 36.9
M18 × 1.5	30	~ 50
	3.1	~ 5.1
	22.13 ~ 36.9
M22 × 1.5	40	~ 60
	4.1	~ 6.1
	29.5 ~ 44.25

(5)Joint bodies

		Tightening torque
Thread size			N·m	Spanner size	Remarks
			kgf·m
(piping screw)			ft·lbf	(reference)	Steel pipe (OD)
	R (tapered thread)		G (straight thread)
	19.6 ~ 29.4 N·m			17 mm			8 mm
1/8”	2.0 ~ 3.0 kgf·m		-
				0.67 in			0.31 in
	14.5 ~ 21.7 ft·lbf
	36.3	~ 44.1	W/O-ring
			Joint Torque	19 mm			12 mm
1/4”	3.7	~ 4.5	58.8 ~ 78.5
				0.75 in			0.47 in
	26.8	~ 32.5	6 ~ 8
			43.4 ~ 57.9		When in
	39.2	~ 49.0	W/O-ring		steel pipe is
			Joint Torque	23 mm	in use.		15 mm
3/8”	4.0	~ 5.0	78.5 ~ 98.1
				0.91 in			0.59 in
	28.9	~ 36.2	8 ~ 10
			57.9 ~ 72.3
	49.0	~ 68.6	W/O-ring
			Joint Torque	26 mm			16 mm
1/2”	5.0	~ 7.0	117.7 ~ 137.3
				1.02 in			0.63 in
	36.2	~ 50.6	12 ~ 14
			86.8 ~ 101.3

I-S-11

WSM U17-3α/U17-3/U17 I. GENERAL

(6)Tightening torque table for hose clamp (Screw type)

				Tightening torque
	No.	Dia. (mm)	Code No.	N·m
				kgf·m
				ft·lbf
	1	Ø12 ~ 16	09318-89016	2.5	~ 3.4
	2	Ø19 ~ 25	09318-89024
				25	~ 35
	3	Ø31 ~ 40	09318-89039
				1.84	~ 2.51
	4	Ø36 ~ 46	09318-89045
	5	Ø15 ~ 25	RC101-64580	4.9	~ 5.9
				50	~ 60
	6	Ø26 ~ 38	68311-72820
				3.61	~ 4.35
				3.4	~ 4.4
	7	Ø13 ~ 20	RB101-63630	35	~ 45
				2.58	~ 3.31
	8	Ø40 ~ 55	RC411-63180
	9	Ø77 ~ 95	69284-63170	4.9	~ 5.9
	10	Ø50 ~ 60	RC401-63190	50	~ 60
				3.61	~ 4.35
	11	Ø32 ~ 44	RD411-63820
	12	Ø32 ~ 51	68311-72830

(7)Nuts for piping

	Steel pipe size	Tightening torque
		N·m		Spanner size
	(O.D. × I.D. ×				Remarks
		kgf·m		(reference)
	Thickness)
		ft·lbf
	8 × 6 × 1 mm	29.4	~ 39.2	17 mm
		3.0	~ 4.0
	0.31 × 0.24 × 0.04 in			0.67 in
		21.7	~ 28.9
	10 × 7 × 1.5 mm	39.2	~ 44.1	19 mm
		4.0	~ 4.5
	0.39 × 0.28 × 0.06 in			0.75 in
		28.9	~ 32.5
	12 × 9 × 1.5 mm	53.9	~ 63.7	21 mm
		5.5	~ 6.5
	0.47 × 0.35 × 0.06 in			0.83 in
		39.7	~ 47.0		When sleeve nut is
	16 × 12 × 2 mm	88.3	~ 98.1	29 mm	in use.
		9.0 ~ 10.0
	0.63 × 0.47 × 0.08 in			1.14 in
		65.1	~ 72.3
	18 × 14 × 2 mm	127.5 ~ 137.3		32 mm
		13.0	~ 14.0
	0.71 × 0.55 × 0.08 in			1.26 in
		94.0 ~ 101.3
	27.2 × 21.6 × 2.8 mm	235.4 ~ 254.97		41 mm
		24.0	~ 16.0
	1.07 × 0.85 × 0.11 in			1.61 in
		173.6 ~ 188.1

I-S-12

WSM U17-3α/U17-3/U17

I. GENERAL

(8)Tightening torque of bolts and nuts

Refer to the tightness torque table below.

	Bolts, Nuts	4T		7T		9T
Nomial Dia.
			SS41	S40C, S45C				SCr4
		7.8	~ 9.3 N·m	9.8 ~ 11.3 N·m		12.3		~ 14.2 N·m
M6		0.80 ~ 0.95 kgf·m		1.00 ~ 1.15 kgf·m		1.25	~		1.45 kgf·m
		5.8	~ 6.9 ft·lbf	7.2	~ 8.3 ft·lbf	9.0	~ 10.5 ft·lbf
		17.7	~ 20.6 N·m	23.5	~ 27.5 N·m	29.4		~ 34.3 N·m
M8		1.80 ~ 2.10 kgf·m		2.40 ~ 2.80 kgf·m		3.00	~		3.50 kgf·m
		13.0	~ 15.2 ft·lbf	17.4	~ 20.3 ft·lbf	21.7		~ 25.3 ft·lbf
		39.2	~ 45.1 N·m	48.0	~ 55.9 N·m	60.8		~ 70.6 N·m
M10		4.00 ~ 4.60 kgf·m		4.90 ~ 5.70 kgf·m		6.20	~		7.20 kgf·m
		28.9	~ 33.3 ft·lbf	35.4	~ 41.2 ft·lbf	44.8		~ 52.1 ft·lbf
		62.8	~ 72.6 N·m	77.5	~ 90.2 N·m	103.0 ~ 117.7 N·m
M12		6.40 ~ 7.40 kgf·m		7.90 ~ 9.20 kgf·m		10.50	~		12.00 kgf·m
		46.3	~ 53.5 ft·lbf	57.1	~ 66.5 ft·lbf	75.9~ 86.8 ft·lbf
		107.9	~ 125.5 N·m	123.6	~ 147.1 N·m	166.7		~ 196.1 N·m
M14		11.00 ~ 12.80 kgf·m		12.60	~ 15.0 kgf·m	17.00	~		20.00 kgf·m
		79.6	~ 92.6 ft·lbf	91.1 ~ 108.5 ft·lbf		123.0		~ 144.7 ft·lbf
		166.7	~ 191.2 N·m	196.1	~ 225.6 N·m	259.9		~ 304.0 N·m
M16		17.00 ~ 19.50 kgf·m		20.00 ~ 23.00 kgf·m		26.50	~		31.00 kgf·m
		123.0	~ 141.0 ft·lbf	144.7	~ 166.4 ft·lbf	191.7		~ 224.2 ft·lbf
		245.2	~ 284.4 N·m	274.6	~ 318.7 N·m	343.2~ 402.1 N·m
M18		25.00	~ 29.0 kgf·m	28.00 ~ 32.50 kgf·m		35.00	~		41.00 kgf·m
		180.8	~ 209.7 ft·lbf	202.5	~ 235.1 ft·lbf	253.2		~ 296.5 ft·lbf
		333.4~ 392.2 N·m		367.7	~ 431.5 N·m	519.8		~ 568.8 N·m
M20		34.00 ~ 40.00 kgf·m		37.50	~ 44.0 kgf·m	53.00	~		58.00 kgf·m
		245.9	~ 389.3 ft·lbf	271.2	~ 318.2 ft·lbf	383.3		~ 419.5 ft·lbf

(9)Types and materials of bolts and nuts

[ex. bolts]

Types	Material	Tensile strength	Hardness	Bolt head marking
		Over 392 MPa	HRB
4T	SS41	2			No mark or marked 4
		4000 kgf/cm	62 ~ 98
		56892 lbf/in2
	S40C	Over 686 MPa	HRC
7T		2			Marked 7
	S45C	7000 kgf/cm	20 ~ 28
		99561 lbf/in2
		Over 882 MPa	HRC
9T	SCr4	2			Marked 9
		9000 kgf/cm	28 ~ 34
		128007 lbf/in2

I-S-13

WSM U17-3α/U17-3/U17 I. GENERAL

(10) Washer-equipped elbow

Tightening torque

	Size	N·m	kgf·m		ft·lbs
	G1/4	25 ~ 30	2.5	~ 3.0	18 ~ 22
	G3/8	49 ~ 54	5.0	~ 5.5	36 ~ 40
	G1/2	59 ~ 64	6.0	~ 6.5	43 ~ 47
	G3/4	118 ~ 127	12.0	~ 13.0	87 ~ 94
	G1

Tightening procedure

1)Connecting with the valve

•Screw in the elbow by hand until the washer comes

into contact.

Note: Clean up the mating seal beforehand.

2)Positioning

•Turn the elbow back to its set position.

Note: Do not make any more than one turn back.

3)Fixing

•Tighten up the lock nut with a wrench.

•Lock nut tightening torque

G1/4: 25 ~ 30 N·m (2.5 ~ 3.0 kgf·m, 18 ~ 22 ft·lbs) G3/8: 50 ~ 55 N·m (5.0 ~ 5.5 kgf·m, 36 ~ 40 ft·lbs) G1/2: 60 ~ 65 N·m (6.0 ~ 6.5 kgf·m, 43 ~ 47 ft·lbs)

G3/4: 118 ~ 127 N·m (12.0 ~ 13.0 kgf·m, 87 ~ 94 ft·lbs) G1: 118 ~ 127 N·m (12.0 ~ 13.0 kgf·m, 87 ~ 94 ft·lbs)

(11) Adhesives

1. Thread adhesive

Types of thread adhesive

* No oil and water allowed on the threads.

Loctite 271 or equivalent (heavy-duty) ThreeBond 1305P or equivalent (heavy-duty) ThreeBond TB1401B or equivalent (light-duty)

ThreeBond 1324 (medium-duty) unless otherwise specified

Type of instant adhesive

ThreeBond 1733 or 1741E

*No oil and water allowed on the threads.

2.Radiator hose sealant

Sealant	ThreeBond #1208E or equivalent

I-S-14

WSM U17-3α/U17-3/U17

I. GENERAL

E. MAINTENANCE INTERVALS

a. EU-version

[Operator servicing]

General maintenance

Elapsed hours of operation

50

100

150

200

250

300

350

400

450

500

Interval

Checking the engine oil level

daily

Check hydraulic oil level

daily

Check fuel level

daily

Check coolant level

daily

Lubricate front-end

daily

attachments

Checking the radiator and oil

daily

cooler

Check electric cables and

daily

connections

Check water separator

daily

Check V-belt

daily

Drain water from the fuel

500 h

reservoir

Lubricate the swivel gear

50 h

Battery service

50 h

Tracks and chassis: clean,

weekly

visually inspect and check

(50 h)

tension

Check nuts and bolts

100 h

Check, clean air filter

1.)

200 h

Grease the swivel bearing

200 h

1.) Under dusty conditions the air filter must be cleaned more frequently or replaced.

I-S-15 1

WSM U17-3α/U17-3/U17 I. GENERAL

[Operator servicing]

General maintenance

Elapsed hours of operation

550

600

650

700

750

800

850

900

950

1000

Interval

Checking the engine oil level

daily

Check hydraulic oil level

daily

Check fuel level

daily

Check coolant level

daily

Lubricate front-end

daily

attachments

Checking the radiator and oil

daily

cooler

Check electric cables and

daily

connections

Check water separator

daily

Check V-belt

daily

Drain water from the fuel

500 h

reservoir

Lubricate the swivel gear

50 h

Battery service

50 h

Tracks and chassis: clean,

weekly

visually inspect and check

(50 h)

tension

Check nuts and bolts

100 h

Check, clean air filter

1.)

200 h

Grease the swivel bearing

200 h

1.) Under dusty conditions the air filter must be cleaned more frequently or replaced.

I-S-16 1

WSM U17-3α/U17-3/U17 I. GENERAL

[Servicing by skilled personnel or KUBOTA dealer]

Servicing

Elapsed hours of operation *

50

100

150

200

250

300

350

400

450

500

Interval

Check/adjust V-belt tension

250 h

Check coolant hoses and

250 h

clamps

Grease pilot valve linkage

250 h

Change engine oil and oil

500 h

filter

Replace the fuel filter

4.)

500 h

Change return filter for the

500 h

hydraulic oil tank

3.)

Please contact your KUBOTA dealer.

Replace the drive unit oil

500 h

Change hydraulic oil and

Please contact your KUBOTA dealer.

1000 h

suction filter

2.)

Replace the in-line filter

Please contact your KUBOTA dealer.

1000 h

Replace the air filter elements

1000 h

1.)

Change running gear and

Please contact your KUBOTA dealer.

2000 h

track roller oil

Check alternator and starter

Please contact your KUBOTA dealer.

2000 h

motor

Check electric cables and

Please contact your KUBOTA dealer.

Annually

connections

Safety inspection

Annually

Replace the coolant and rinse

every 2

the cooling system

years

Replace coolant hoses and

250 h

clamps

Please contact your KUBOTA dealer.

every 6

Change hydraulic hoses Please contact your KUBOTA dealer.

years

*The servicing identified with z must be carried out after the specified hours of operation after initial operation have been reached.

1.) Under dusty conditions the air filter must be cleaned more frequently or replaced. 2.) When using a hydraulic hammer over 20% → every 800 h.

When using a hydraulic hammer over 40% → every 400 h. When using a hydraulic hammer over 60% → every 300 h. When using a hydraulic hammer over 80% → every 200 h.

3.) When using a hydraulic hammer up to 50% → every 200 h. When using a hydraulic hammer over 50% → every 100 h.

Replace the return filter approximately 250 hours after the initial operation. 4.) Earlier if necessary.

I-S-16-1 1

WSM U17-3α/U17-3/U17 I. GENERAL

[Servicing by skilled personnel or KUBOTA dealer]

Servicing

Elapsed hours of operation

550

600

650

700

750

800

850

900

950

1000

Interval

Check/adjust V-belt tension

250 h

Check coolant hoses and

250 h

clamps

Grease pilot valve linkage

250 h

Change engine oil and oil

500 h

filter

Replace the fuel filter

4.)

500 h

Change return filter for the

500 h

hydraulic oil tank

3.)

Please contact your KUBOTA dealer.

Replace the drive unit oil

500 h

Change hydraulic oil and

Please contact your KUBOTA dealer.

1000 h

suction filter

2.)

Replace the in-line filter

Please contact your KUBOTA dealer.

1000 h

Replace the air filter elements

1000 h

1.)

Change running gear and

Please contact your KUBOTA dealer.

2000 h

track roller oil

Check alternator and starter

Please contact your KUBOTA dealer.

2000 h

motor

Check electric cables and

Please contact your KUBOTA dealer.

Annually

connections

Safety inspection

Annually

Replace the coolant and rinse

every 2

the cooling system

years

Replace coolant hoses and

250 h

clamps

Please contact your KUBOTA dealer.

every 6

Change hydraulic hoses Please contact your KUBOTA dealer.

years

1.) Under dusty conditions the air filter must be cleaned more frequently or replaced. 2.) When using a hydraulic hammer over 20% → every 800 h.

When using a hydraulic hammer over 40% → every 400 h. When using a hydraulic hammer over 60% → every 300 h. When using a hydraulic hammer over 80% → every 200 h.

3.) When using a hydraulic hammer up to 50% → every 200 h. When using a hydraulic hammer over 50% → every 100 h.

4.) Earlier if necessary.

I-S-16-2 1

WSM U17-3α/U17-3/U17

I. GENERAL

b. PP (KTC, KCL)-version

No.

Check points

Intervals

Hour meter indicator

Consequently

50

100

150

200

250

300

350

400

450

1

Coolant

check

Daily check

change

every 2 years

2

Fuel

check

Daily check

3

Engine oil

check

Daily check

change

every 500 hrs

4

Hydraulic oil

check

Daily check

change

every 1000 hrs

*1

5

Lubrication points

-

Daily check

6

Radiator and oil cooler

check

Daily check

7

Engine and electrical wiring

check

Daily check

every year

8

Fuel tank, Fuel filter

drain

every 50 hrs

9

Battery condition

check

every 50 hrs

10

Greasing swing bearing teeth

-

every 50 hrs

11

Fan belt tension

adjust

every 200 hrs

12

Radiator hoses and clamps

check

every 200 hrs

replace

every 2 years

Outer element

clean

every 200 hrs

*2

13

Air filter element

@

replace

every 1000 hrs

*2

Inner element

replace

every 1000 hrs

*2

14

Greasing swing ball bearings

-

every 200 hrs

15

Fuel filter element

replace

every 400 hrs

@

16

Engine oil filter

replace

every 500 hrs

17

Drive unit oil

change

every 500 hrs

18

Hydraulic return filter element

replace

every 500 hrs

19

Hydraulic suction filter element

replace

every 1000 hrs

20

Fuel injection nozzle injection

check

every 1500 hrs

*4

@

pressure

21

Front idler and track roller oil

change

every 2000 hrs

22

Alternator and starter motor

check

every 2000 hrs

23

Injection pump

check

every 3000 hrs

*4

@

24

Radiator system

rinse

every 2 years

25

Fuel line and Intake air line

check

every 200 hrs

@

replace

every 2 years

*3

* 500 thru 1000 continued to the following table.

I-S-17

WSM U17-3α/U17-3/U17

I. GENERAL

No.

Check points

Intervals

Hour meter indicator

Consequently

500

550

600

650

700

750

800

1000

1

Coolant

check

Daily check

change

every 2 years

2

Fuel

check

Daily check

3

Engine oil

check

Daily check

change

every 500 hrs

4

Hydraulic oil

check

Daily check

change

every 1000 hrs

*1

5

Lubrication points

-

Daily check

6

Radiator and oil cooler

check

Daily check

7

Engine and electrical wiring

check

Daily check

every year

8

Fuel tank, Fuel filter

drain

every 50 hrs

9

Battery condition

check

every 50 hrs

10

Greasing swing bearing teeth

-

every 50 hrs

11

Fan belt tension

adjust

every 200 hrs

12

Radiator hoses and clamps

check

every 200 hrs

replace

every 2 years

Outer element

clean

every 200 hrs

*2

13

Air filter element

@

replace

every 1000 hrs

*2

Inner element

replace

every 1000 hrs

*2

14

Greasing swing ball bearings

-

every 200 hrs

15

Fuel filter element

replace

every 400 hrs

@

16

Engine oil filter

replace

every 500 hrs

17

Drive unit oil

change

every 500 hrs

18

Hydraulic return filter element

replace

every 500 hrs

19

Hydraulic suction filter element

replace

every 1000 hrs

20

Fuel injection nozzle injection

check

every 1500 hrs

*4

@

pressure

21

Front idler and track roller oil

change

every 2000 hrs

22

Alternator and starter motor

check

every 2000 hrs

23

Injection pump

check

every 3000 hrs

*4

@

24

Radiator system

rinse

every 2 years

25

Fuel line and Intake air line

check

every 200 hrs

@

replace

every 2 years

*3

First operation

*1 When using a hydraulic breaker, change hydraulic oil and return filter according to the table on "Hydraulic Oil Change (Including Exchange of the Suction Filter in the Hydraulic Tank) under "EVERY 1000 SERVICE HOURS" in the chapter "REGULAR CHECKS AND MAINTENANCE WORK".

*2 Clean and replace the air filter more frequently if used under dusty conditions. By heavy soiling, replace the filter. *3 Replace only if necessary.

*4 Consult your local KUBOTA Dealer for this service.

AThe items listed above (@ marked) are registered as emission related critical parts by KUBOTA in the U.S. EPA nonroad emission regulation. As the engine owner, you are responsible for the performance of the required maintenance on the engine according to the above instruction. Please see the Warranty Statement in detail.

I-S-18

WSM U17-3α/U17-3/U17 I. GENERAL

c. KTA-version

No.

Checkpoints

Intervals

Hour meter indicator

Consequently

Ref.

50

100

150

200

250

300

350

400

450

500

550

600

1000

2000

page

1

Fuel

check

Daily check

49

2

Engine oil

check

Daily check

50

change

every 250 hrs

56

3

Hydraulic oil**

check

Daily check

51

change

every 1000 hrs

63

4

Coolant

check

Daily check

49

change

every 2 years

64

5

Lubrication points

check

Daily check

52

6

Radiator

check

Daily check

53

7

Battery condition

check

every 50 hrs

50,51

8

Electrical lines

check

Daily check, Annual servicing

64

9

Greasing of swing

every 50 hrs

54

bearing teeth

10

Drive unit oil

change

every 500 hrs

59

11

Fan belt tension

adjust

every 200 hrs

57

12

Radiator hoses

check

every 200 hrs

58

and clamps

change

every 2 years

64

13

Air filter element*

clean

every 200 hrs

55

@

change

every 1000 hrs

63

14

Greasing of swing

every 200 hrs

56

ball bearings

15

Fuel pipes and

check

every 200 hrs

hoses

change

every 2 years

58

16

Engine oil filter

change

every 250 hrs

58

17

Fuel filter

check

every 50 hrs

change

every 500 hrs

59

@

18

Hydraulic return

change

every 1000 hrs

60

filter element

19

Hydraulic suction

change

every 1000 hrs

62

filter element

20

Front idler and

change

every 2000 hrs

63

track roller oil

21

Dynamo and

check

every 2000 hrs

63

starter motor

22

Radiator system

rinse

every 2 years

64

23

Fuel injection nozzle

check

every 1500 hrs

57

@

(Injection pressure)

24

Injection pump

check

every 3000 hrs

57

@

IMPORTANT:

•* Clean the air filter more frequently if used in dusty conditions. With heavy soiling, replace the filter.

**When using a hydraulic breaker, change hydraulic oil and return filter according to the table on "Hydraulic Oil Change(Including Exchange of the Suction Filter in the Hydraulic Tank)" under "EVERY 1000 SERVICE HOURS" in "REGULAR CHECKS AND MAINTENANCE WORK".

•The items listed above (@ marked) are registered as emission related critical parts by KUBOTA in the U.S.EPA nonroad emission regulation. As the engine owner, you are responsible for the performance of the required maintenance on the engine according to the above instruction. Please see the Warranty Statement in detail.

I-S-19

WSM U17-3α/U17-3/U17	I. GENERAL
d. Hydraulic Oil Check for Machines with Hydraulic Breakers

The hydraulic oil change after 1000 operating hours in the operator’s manual is based on the type of work done. Following inspection measure are valid when hydraulic breakers are used:

1. Changing and filling up of hydraulic oil

1) The hydraulic oil must be changed more often when breakers are used because the machine is subject to harder conditions than at normal excavating work.

2) Use only the recommended oils mentioned in the operator’s manual when changing or fill oil.

3) When filling up oil, never mix oils of different makes.

2. Changing the return filter and oil

1) The filter must be changed more often because of contamination resulting from the frequent assembly and disassembly of the hoses.

2) Use the correct replacement filter.

3) Oil change according to operating hours.

				Hydraulic oil		Return Filter	Suction Filter
Normal excavator work				every 1000 hrs.		500 hrs.
		20%		every 800 hrs.		300 hrs.
Breaker		40%		every 400 hrs.			1000 hrs.
		60%		every 300 hrs.
work
portion	More					100 hrs.
		than		every 200 hrs.
		80%
3. Kubota’s recommended						breakers for	U17-3α and
U17/U17-3.
(Japanese breakers)
Furukawa						HB2G
Tokuu						TNB-1E
Maruzen						MHB-71
Nippon Pneumatic						H-08X

I-S-20

WSM U17-3α/U17-3/U17

I. GENERAL

e. Maintenance Items

(1)Drive unit Oil Change (First Oil Change of the 100 hours)

CAUTION

To avoid personal injury:

•Lower attachments on the ground, stop the engine and remove the key before undertaking the oil change.

1)Rotate the crawler so that the drain plug of the drive unit is in the bottom position.

2)Remove the drain plug to let the oil run out. Screw in and tighten the drain plug again and fill with gear oil through the oil check port.

3)Fill oil until it overflows out of the oil check port.

Gear oil volumes	Approx. 0.25 L (0.07 USgal.)

Oil change

•first oil change after 100 hrs

•then every 500 hrs

•or at least once a year

4)Use prescribed gear oil SAE 90.

(1)Oil check port (also serves as oil filling port)

(2)Drain plug

(2)Inspection and Cleaning of the Air Filter Element

Open the engine bonnet and remove the dust-cover. Take out only outer element, clean the element, case interior and reassemble. During reassembly, take care to install the dust-cover so that its TOP mark (arrow) faces up-wards. Do not remove the inner element.

IMPORTANT:

•Should the machine be used in extremely dusty areas, the air filter element must be inspected and cleaned more frequently than in the specified maintenance periods.

•The air filter has a dry element, keep free from oil.

•Do not run the engine without the air filter.

(1)Outer element

(2)Inner element

(3)Dust-cover

(4)Clamps

I-S-21

WSM U17-3α/U17-3/U17

I. GENERAL

CAUTION

To avoid personal injury:

• Wear eye protection.

Cleaning with compressed air

Pressure of compressed air must be under 205 kPa

(2.1 kgf/cm2, 30 psi) and the cartridge should be blown clean from the inside to the outside until the dust deposits are remarkably reduced.

IMPORTANT:

•If the air suction is still inadequate, or the color of the exhaust gases is abnormal even after the cleaning, the air filter element must be replaced.

(3)Cleaning the Track Frame Slide Pipes

When the slide pipes of the track frame are clogged or adhered with soil or sand, clean the slide pipes in the following manner according to need.

WARNING

To avoid the personal injury or death:

• Place the machine on even ground when cleaning the track frame slide pipes.

1.First lift the machine off the ground using the dozer blade and boom functions.

2.Switch the track width change / dozer select lever to the “Track width change” position.

3.Push the control lever forward, and expand the track width to 1240 mm (48.8 in.).

4.Remove soil and sand adhered to the slide pipes, then put grease evenly around the pipes. Make sure all 4 slide pipes are greased.

5.Retract and expand the track width repeatedly for a few times by moving the control lever, so that the grease is spread adequately.

6.Switch the track width change / dozer select lever to the “Dozer” position.

7. Place the machine down on the ground carefully	(1) Track frame slide pipes
by moving the dozer blade and the boom.

I-S-22

WSM U17-3α/U17-3/U17

I. GENERAL

f. Troubleshooting for Operators

If the excavator does not show the desired performance, or when trouble arises, refer to the table below and undertake appropriate measures.

	Trouble	Cause		Countermeasure
			*	Check fuel tank and filter
		Fuel is too viscous	*	Remove impurities and water
			*	If necessary, replace filter
			*	Remove water from the fuel tank
			*	Check fuel pipe joint bolts and nuts for looseness
		Air or water in the fuel system	*	Purging of the fuel system (for fuel filter and injection pump,
	Starting difficulties			see "PURGING OF THE FUEL SYSTEM" in "OTHER
				ADJUSTMENTS AND REPLACEMENTS".)
		Oil viscosity is too high that the	*	Pour hot water over the radiator
			*	Use oils of different viscosities depending on the ambient
		engine runs sluggishly in winter
				temperature. (Use SAE10W, SAE10W-30 or SAE10W-40)
		Battery is almost dead; insufficient	*	Recharge battery
		compression
	Insufficient engine	Low fuel level	*	Check fuel and add if necessary
	power	Clogged air cleaner	*	Clean the air filter element
	Engine suddenly	Low fuel level	*	Check fuel and add if necessary
	stops		*	Purge the fuel system
Engine
	Abnormal exhaust	Poor fuel	*	Use high quality fuel
	gas color	Too much engine oil	*	Drain engine oil to prescribed oil level
		Defective seal of the water pump	*	Replace
		Worn or torn fan belt	*	Adjust or replace
		Thermostat is defect	*	Replace
		Coolant level too low	*	Fill to prescribed level
		Radiator grill or fins are clogged	*	Clean
		Coolant is contaminated with rust	*	Replace coolant fluid and add anti-rust
	Water temperature	from the cylinder head or crank case
	too high (Overheat-	Defective radiator cap (Evaporation)	*	Replace
	ing)
		Corroded coolant pipes	*	Clean
		Continuous operation under full load	*	Reduce load
		Cylinder head gasket is damaged	*	Replace
		(Coolant loss)
		Engine oil level too low	*	Fill to prescribed level
		Maladjustment of fuel injection	*	Readjust ignition timing
		Use of poor fuel	*	Use prescribed fuel
System	Boom, arm, bucket,	Hydraulic oil level too low	*	Add oil
	dozer power is too	Leakages of hoses and/or joints	*	Replace hose or joint
	drive, swing and
Hydraulic	low
	swing motor	Swing lock pin is in lock position	*	Remove swing lock pin in unlock position
	Non-function of
System		Blocked through stones	*	Remove
	Deviation of drive
Drive	direction	Crawler too loose or too tight	*	Adjust accordingly

I-S-23

WSM U17-3α/U17-3/U17

I. GENERAL

g. Periodic Replacement of Important Component Parts

To ensure safety in operation, you are strongly requested to inspect and service the machine at regular intervals. For added safety, ask your KUBOTA dealer to replace the following important component parts. These parts are prone to degradation in material or subject to wear and tear with time. It is difficult to judge how much they have been affected at regular inspection. It is therefore necessary to replace them with new ones, whether wear is visible or not after a specified time of use.

If any of them is found worn even before the specified use, it must be repaired or replaced the same way as other parts.

If any of the hose clamps is found deformed or cracked, the hose clamp must also be replaced.

For the hydraulic hoses other than the ones to be replaced periodically, inspect them for the following points. If found unusual, tighten them up, replace them.

When replacing the hydraulic hoses, change their O rings and sealings with new ones. For replacement of the important parts, contact your KUBOTA dealer.

• At the following periodic inspections, check the fuel hoses and hydraulic hoses as well.

Inspection Interval	Check points
Daily Checks	Oil leak at fuel and hydraulic hose connections and points
Every month	Oil leak at fuel and hydraulic hose connections and points Damages at fuel and hydraulic hose
	(cracks, chafing)
Every year	Oil leak at fuel and hydraulic hose connections and points Interference, deformation, degrada-
	tion, twist and other damages (cracks, chafing) of fuel and hydraulic hoses

List of important component parts

No.	Component parts	Q'ty	Period
1	Fuel hose (Fuel tank-Fuel filter)	2
2	Fuel hose (Fuel filter-Fuel pump)	2
3	Fuel hose (Fuel pump-Fuel nozzle)	2
4	Fuel hose (Fuel nozzle-Fuel tank)	1
5	Fuel hose (Fuel tank-Fuel drain)	1
6	Hydraulic hose (Main pump suction)	1
			Every 2 years or 4000 hours
7	Hydraulic hose (Main pump delivery)	4
8	Hydraulic hose (Boom cylinder)	2
9	Hydraulic hose (Arm cylinder)	2
10	Hydraulic hose (Bucket cylinder)	2
11	Hydraulic hose (Swing cylinder)	2
12	Hydraulic hose (Dozer cylinder)	2
13	Hydraulic hose (Service port)	4

To prevent serious damage to the hydraulic system, use only KUBOTA genuine hydraulic hose.

I-S-24