Kubota L185, L245, L235, L285, L295 Shop Manual

SHOP MANUAL

KUBOTA

Models

L185-L235-L245-L275-L285-L295-L305-L345-L355

INDEX (By Starting Paragraph)

L185 L235 L245 L275 L285 L295 L305

L345

BRAKES

Adjustment 105

R&R and Overhaul 106

CLUTCH

Adjustment 63
Overhaul 65
Remove and

Reinstall 64

COOLING SYSTEM

Fan Shaft 59
Radiator 56
Thermostat
Water Pump

DIESEL FUEL SYSTEM

Fuel Filter 44
Glow Plugs 54
Injection Nozzles 50
Injection Pump 46

DIFFERENTIAL AND BEVEL GEARS

Differential Lock 97
Overhaul 92
Remove and Reinstall 91

ELECTRICAL SYSTEM

Alternator and

Regulator 60

Starter Motor and

Magnetic switch 62

Wiring Diagrams

ENGINE AND COMPONENTS

Cam Followers 29
Camshaft 33
Compression Release 24
Connecting Rods and

Bearings 38

Crankshaft and Main

Bearings 39

Crankshaft Rear Oil

Seal 40
Cylinder Head 23
Cylinder Sleeves 37
Flywheel 41
Oil Pump 42
Piston and Rings 35

64

38

39

64

38

39

64 64 64 64

38

39

38

39

38

39

38

39

64

L355

105
106

63
65

105
106

63
65

105
106

63
65

105
107

63
65

105
106

63
65

105
106

63
66

105
106

63
66

105
106

63
65

64

56
57
58

44
54
50
46

97
92
91

60

62

29
33
24

56
57
58

44
54
50
46

' 97

92
91

60

62

29
33
24

56
57
58

44
54
50
46

97
92
91

60

62

29
33
24

56
57
58

44
54
50
46

97
92
91

60

62

js

6 1

through

29
33
24

56
57
58

44
54
50
46

97
93
91

60

62

64

29
33
24

56
57
58

44
54
50
46

97
93
91

60

62

29
33
24

56
57
58

44
54
50
46

97
93
91

60

62

29
33
24

56
57
58

44
54
50
46

97
93
91

60

62

29
33
24

38

39

40
23
37
41
42

35

40
23
37
41
42

35

40
23
37
41
42

35

40
23

37
41
42
35

40
23

37
41
42
35

40
23

37
41
42
35

40
23

37

41

42
35

40
23

37
41
42
35

INDEX (CONT.)

L185

L235 L245

L275

L285

L295 L305 L345

L355

ENGINE AND COMPONENTS (CONT.)

Piston Pins 36
Remove and

Reinstall engine 22

Rod and Piston

Units 34

Timing Gear Cover 31
Timing Gears 32
Valve Guides 26
Valve Levers 28
Valves and Seats . 25
Valve Springs 27
Valve Timing 30

FINAL DRIVE

Overhaul 101
Remove and

Reinstall 100

FRONT SYSTEM (Except FWD)

Axle 1
Steering Spindle

and Wheel Hub 3

Tie Rods and

Toe-In 2

FRONT-WHEEL DRIVE

Differential and Bevel

Gear Assembly 8
Drive Shaft 9
Front Axle 6
Outer Drive Assembly 7
Tie Rods and Toe-In 5
Transfer Case 10

HYDRAULIC SYSTEM

Fluid and Filter 114
Hydraulic Valves 121
Pump 119
Rockshaft Housing 127

Test and Adjust 116
Troubleshooting 115

POWER TAKE-OFF

Overrunning Clutch 109
Remove and Reinstall 108

SHUTTLE TRANSMISSION

Shuttle Clutches
Shuttle Control Valve

STEERING SYSTEM

Manual Steering 11
Power Steering
Steering Pump

TRANSMISSION

Front Transmission 70
Rear Transmission 74
Shifter Rails and

Forks 68

22

34
31

32
26
28
25
27
30

103

100

1

3

2

8
9
6

7
5

10

114
121
119

127
116
115

111
110

36

22

34
31
32
26
28
25
27
30

101

100

1

3

2

8
9
6

7
5

10

114
121
119
127
116
115

109
108

36

22

34
31
32
26
28
25
27
30

103

100

1

3

2

8
9
6
7
5

10

114
121
119
127
116
115

111
110

36

22

34
31
32
26
28
25
27
30

102

100

1

3

2

114
121
119
127
116
115

109
108

36

22

34
31
32
26
28
25
27
30

104

100

1

3

2

8
9
6
7
5

10

114
121
119
127
116
115

109
108

36

22

34
31
32
26
28
25
27
30

104

100

1

3

2

8
9
6
7
5

10

114
121
120
127
116
115

112

36

22

34
31
32
26
28
25
27
30

104

100

1

3

2

8
9
6
7
5

10

114
121
120
127
116
115

112

36

22

34
31
32
26
28
25
27
30

104

100

...

8
9
6
7
5

10

114
121
120
127
116
115

113

11
13
18

81
85

11

70
74

00 CO —'

81
85

11

70
74

11

70
74

13

18

70
74

13
18

70
74

90
88

13

18

83
85

79

68 79

68

68

69 69

80

DUAL DIMENSIONS

This service manual provides specifications in both the U.S. Customary and Metric (SI)
systems of measurement. The first specification is given in the measuring system per­ceived by us to be the preferred system when servicing a particuiar component, whiie the
second specification (given in parenthesis) is the converted measurement. For instance, a
specification of "0.28 mm (0.011 inch)" wouid indicate that we feei the preferred measure­ment, in this instance, is the metric system of measurement and the U.S. system

equivaient of 0.28 mm is 0.011 inch.

CONDENSED SERVICE DATA

L185 L235

GENERAL

Engine Make

Engine Model Z751A D1102A
Number of Cylinders 2 3
Bore 76 mm 76 mm

(3 in.) (3 in.)

Stroke

Displacement 743 cc 1115 cc

(45.3 cu.in.) (68.3 cu.in.)
Cylinder Sleeves
Battery-Volts

Ground Polarity

Forward Speeds

TUNE-UP

Compression Pressure —

FiringOrder 1-2 1-2-3
Valve Clearance-

Intake and Exhaust

Injection Timing

(BTDC) - . .
Timing Mark Location
Injection Pressure

Low Idle Speed (rpm)
High Idle Speed (rpm) 2950 2750
Rated Speed (rpm) 2800 2600
Rated Power at Pto Shaft 11.5 kW

14.61

kW

(15.45 HP) (19.59 HP)

SIZES-CLEARANCES

Crankshaft Main Journal-

Diameter

Bearing Clearance -

Front Bearing

All Other Bearings

Crankshaft Crankpin Journal -

Diameter

Bearing Clearance

Crankshaft End Play

Camshaft Journal -

Diameter

Bearing Clearance

L24S

Own —

DllOlA

3

76 mm

(3 in.)

—

82

mm —

(3.23 in,)

1115 cc

(68.3 cu.in.)

Dry —

12

—

Negative

8

L275 L285

-

3,235

kPa

(470 psi)

1-2-3

—

0.18-0.22

mm

(0.007-0.009 in.)

-25°

-

Flywheel

-13720-14700 kPa
(1990-2135 psi)

800-850

2950
2800

16.4 kW
(22 HP)

-51.921-51.940 mm
(2.0441-2.0449 in.)

-0.040-0.118 mm ­(0.0016-0.0046 in.)

—

0.040-0.104

m m -

(0.0016-0.0041 in.)

-43.959-43.975 mm
(1.7307-1.7313 in.)

-0.035-0.093 mm ­(0.0014-0.0037 in.)

—

0.15-0.31

mm -

(0.006-0.012 in.)

-39.934-39.950 mm
(1.5722-L5728 in.)

—

0.050-0.091

mm -

(0.0020-0.0036 in.)

D1302A

3

82 mm

(3.23 in.)

V1501A

4

76 mm

(3 in.)

1299 cc

(79.3 cu.in.)

1487 cc

(90.7 cu.in.)

1-2-3

1-3-4-2

2750
2600

17.5 kW

(23.42 HP)

2550
2400

19.8 kW

(26.45 HP)

CONDENSED SERVICE DATA (CONT.)

SIZES-CLEARANCES (CONT.)

^^^ ^ ^^^^ ^^^^ ^275

Cam He ig ht -

Intake

and

Exhaust

.

33.36

mm

(1.3134

in.)

Piston

Pin-

I^ia'^eter

23.002-23.011

mm

(0.9056-0.9059

in.)

Clearance

in Rod

-0.014-0.038

mm

(0.0006-0.0015

in.)

Valve Seat An gl e-

Intake

and

Exhaust

. 450

CAPACITIES

CrankcaseOil

3.8 L 6.1 L 6.1 L 6.1 L

r. ,• c. (4.0 qts.) (6.4 qts.) (6.4 qts.) (6.4 qts.)
CoolmgSystem

5.3 L 6.6 L 6.6 L 6.6 L

.

. (5.6 qts.) (7.0 qts.) (7.0 qts.) (7.0 qts.)

Iransmission-

2WD

22 L 24 L 22 L 24 L

,,,,^

(23 qts.) (25 qts.)

(23

qts.)

(25

qts.)

4WD

23 L 24 L 23 L 24 L

^,

.^

^ (24 qts.) (25 qts.) (24 qts.) (25 qts.)

PluidType

—

Kubota UDT Transmission Fluid

-

Front Axle Differential

Case(4WD)

1.1 L 2.3 L 1,1 L 2.6 L

™

. . ^ (1.2 qts.) (2.4 qts.) (1.2 qts.) (2.7 qts.)

FluidType

SAE

80

or

90 Gear Oil

Front Axle Outer Drive

Case (4WD)-Each

0.8 L 0.3 L 0.8 L 0.3 L
(0-8

qts.)

(0.3

qts.)

(0.8

qts.)

(0.3

qts.)

FluidType

SAE

80

or

90 Gear Oil

Steering Gear

Box

(Manual)

^0.3L

T.T

. (^-3 qt s. )

FluidType

SAE

80

or

90 Gear Oil

CONDENSED SERVICE DATA

L295

GENERAL

Engine Make

^__^

Engine Model D1301A
Number

of

Cylinders

3

Bore

' 82 mm

(3.23

in.)

Stroke

Displacement

1299 cc

(79.8 cu.in.)

Cylinder Sleeves

Battery-Volts

Ground Polarity

Forward Speeds

TUNE-UP

Compression Pressure

Firing Order

1-2-3

Valve Clearan ce-

Intake

and

Exhaust

Injection Timing (BTDC)
Timing Mark Location
Injection Pressure

L305

L345

-Own

D1301A

3

82

mm

(8.28

in.)

-82 mm

V1501A

4

76

mm

(8

in.)

(8.28

in.)

1299

CC

1487

CC

(79.8 cu.in.)

(90.7

cu.in.)

Dry

.

12

L285

8.9 L

(9.4

qts.)

7.0

L

(7.4

qts.)

27

L

(29

qts.)

L355

V1702A

4

82

mm

(8.28

in.)

1782

CC

(105.6 cu.in.)

-

Negative

8

—

1-2-8

-8285kPa
(470

psi)

1-8-4-2

1-8-4-2

-0.18-0.22mm
(0.007-0.009

in.)

25°

-

Flywheel

-18720-14700

kPa-

(1990-2185

psi)

CONDENSED SERVICE DATA (CONT.)

L295

TUNE-UP (CONT.)

Low Idle Speed (rpm)
High Idle Speed (rpm) . . .
Rated Speed (rpm)

Rated Power at Pto Shaft

2950
2800

19.7 kW

(26.46 HP)

SIZES-CLEARANCES

Crankshaft Main Journal -

Diameter

Bearing Clearance-

Front Bearing

All Other Bearings

Crankshaft Crankpin Journal-

Diameter

Bearing Clearance

Crankshaft End Play

Camshaft J o u rn a l -

Diameter

Bearing Clearance

Cam Height-

Intake and Exhaust

Piston Pin-

Diameter

Clearance in Rod

Valve Seat A ng le -

Intake and Exhaust

CAPACITIES

Crankcase Oil 6.1 L

(6.4 qts.)

Cooling System 5.8 L

(6.1 qts.)

Transmission -

2WD 26 L

(27.5 qts.)

4WD 27 L

(28.5 qts.)

Fluid Type

Front Axle Differential

Case(4WD) 2.0 L

(2.1 qts.)

Fluid Type

Front Axle Outer Drive

Case(4WD)-Each 1.5 L

(1.6 qts.)

Fluid Type

Steering Gear Box (Manual) 0.3 L

(0.3 qts.)

Fluid Type SAE 80 or 90'

Gear Oil

Power Steering Reservoir

Fluid Type

*Same as transmission.

L305

L345

-800-850­2950
2800

19.5 kW

(26.21 HP)

2950
2800

21.9 kW

(29.35 HP)

-51.921-51.940 mm
(2.0441-2.0449 in.)

-0.040-0.118 mm ­(0.0016-0.0046 in.)

—

0.040-0.104

mm -

(0.0016-0.0041 in.)

—

43.959-43.975 mm

(1.7307-1.7313 in.)

—

0.035-0.095

mm -

(0.0014-0.0037 in.)

—

0.15-0.31

mm -

(0.006-0.012 in.)

-39.934-39.950 mm

(1.5722-1.5728 in.)

—

0.050-0.091

mm -

(0.002-0.0036 in.)

-33.36 mm
(1.3134 in.)

-23.002-23.011 mm
(0.9056-0.9059 in.)

—

0.014-0.038

mm -

(0.0006-0.0015 in.)

-45°

6.1 L :

(6.4 qts.)

(6.1 qts.) • :

22 L

(23.2 qts.)

22 L

(23.2 qts.)

-

Kubota UDT Transmission Fluid

5.0 L 5.0 L

(5.3 qts.) (5.3 qts:)

SAE 80 or 90 Gear Oil —

9.1

(9.6

7.C

(7.4

22

(23.2

22

(23.2

L

qts.)
)L
qts.)

L

qts.)

L

qts.)

0.7 L 0.7 L

(0.7 qts.) (0.7 qts.)

SAE 80 or 90 Gear

Oil

—

0.2 L

L355

2750
2600

21.6 kW
(29 HP)

9.1 L

(9.6 qts.)

7.0 L

(7.4 qts.)

32 L

(33.8 qts.)

5.0 L

(5.3 qts.)

0.7 L

(0.7 qts.)

(0.2 qts.)

SAE 80 or 90

Gear Oil

1.5 L

(1.6 qts.)

Kubota UDT Transmission Fluid

1.5 L

(1.6 qts.)

6

SHOP MANUAL

Paragraphs 1-3

FRONT SYSTEM

(TWO-WHEEL DRIVE)

FRONT AXLE

All Models So Equipped

1.

Fig. 1 shows an exploded view of
typical tread front axle assembly
used oh Models L185 and L285. Model

L275 uses an adjustable tread front axle
as shown in Fig. 2. All other models are
equipped with an adjustable tread front
axle as shown in Fig. 8.

Service procedures are basically
similar for all models. Front axle pivot
pin (8) is retained by a spring pin (9) at
rear and by an adjusting nut (1) at front.

Diametral clearance between pivot pin
and bushings (4) should not exceed 0.5
mm (0.020 inch). Renew bushings and
pivot pin as needed if clearance is ex­cessive.

When reinstalling front axle assembly,
lubricate pivot pin and bushings with
multi-purpose grease, then check and
adjust axle end play as follows: Use a
spring scale to measure force required
to pivot axle as shown in Fig. 8A. Turn
pivot pin adjusting nut as required to ob­tain pivot force between 49-117 N (11-26
pounds). Secure nut with cotter pin.

TIE RODS AND TOE-IN

All Models So Equipped

2.

Tie rod and drag link ends are non­adjustabie, automotive type. Renew
ends that are excessively worn.

Adjust front wheel toe-in to 2-8 mm
(V8-5/16 inch) by shortening or lengthen­ing tie rod. Adjust length of drag link, if
necessary, to permit equal turning
radius in either direction.

STEERING SPINDLE AND

WHEEL HUB

All Models So Equipped

8. Refer to appropriate Fig. 4 or Fig.
5 for exploded view of steering spindle
and associated parts. To remove spindle

(11),

remove front wheel and steering
arm, then lower spindle from axle. Use a
suitable puller to remove wheel hub and
bearings.

Inspect al! parts for excessive wear,

corrosion or other damage. Maximum

recommended diametral clearance be­tween spindle and bushings is 0.4 mm

(0.016 inch).

Fig. 1—Expioded view of

fix-

ed tread front axle used on

Motfe/s L185 and L235.

1.

Adjusting nut

2.

Adjusting collar

3.

Pivot pin

4.

Pivot bushings

5.

Spindle bushings

6. Axle

7.

"0" ring

8. Washer

9. Spring pin

10.

Axle bracket

en—5

Fig.

2—Expioded view of ad-

justabie tread front axie

used on Modei

L275.

Except

for axle extension

(11),

refer

to Fig. 1 legend.

Fig.

3—Expioded view of ad­justabie tread front axle
used on Modeis L245, L285,

L295, L305 and L345.

1.

Af ljusting nut

2.

Ad justi ng collar

3.

Pivot i)in

4.

Pivot bu shings

f).

Spin dle bu shing s

fi. A xle

7.

" ()" ring

8. Wa sher

9. Sp ring pin

10.

Axle b racke t

11.

Axk* e xtens ion

12.

[^um[)er

Paragraphs 4-6

KUBOTA

^

11

Fig. BA—Use a spring scafe
to measure force required to

pivot axie.

Fig. 4—'Expioded view of
typicai spindie, wheei hub
and steering iinkage used on

Modeis L18S and L23S.

1.

Steering arm R.H.

2.

Tie rod

4.

Drag link end

5.

Drag link

6. Tie rod end

7.

Steering arm L.H.

*

8. Axle

9. Thrust bearing

10.

Seal

11.

Spindle ,

12.

Dust cover

13.

Seal

14.

Bearing (inner)

15.

Wheel hub

16.

Spacer

17.

Bearing (outer)

18.

Washer

19.

Nut

20.

Cap

Fig. 5—Expioded view of
splndie, wheei hub and
steering ilni(age used on
tractors equipped with ad-

justabie tread front axie.

Refer to Fig. 4 iegend.

Fig. S—Position spindie thrust bearing as

shown when reinstaiiing spindie assembiy.

To reassemble, pack wheel bearings
and hub with mutlti-purpose grease and
press bearings and hub onto spindle
shaft. Tighten slotted nut securely and
install cotter pin. Lubricate spindle and
bushings with mult-purpose grease.
Reinstall spindle assembly making cer­tain thrust bearing is positioned correct­ly as shown in Fig. 6. Push upward on
spindle assembly to remove end play,
then install steering arm and tighten
clamp bolt. >

FRONT-WHEEL

DRIVE

All Models So Equipped

4.

Front-wheel drive assembly in­cludes transfer case, drive shaft, front
axle,

differential, axle shafts and axle
hub assemblies. The transfer case is
mounted to bottom of range transmis­siQn housing. Transmission oil lubricates
transfer case assembly. Refer to Fig. 7
for cross-sectional view of front-wheel
drive axle assembly.

TIE RODS AND TOE-IN

All Models So Equipped

5.

Tie rod ends are non-adjustable

type.

Tie rod ends that are excessively

worn should be renewed.

Toe-in on all models should be 2-8 mm
(1/8-5/16 inch). Adjust by lengthening or
shortening tie rod.

FRONT DRIVE AXLE

All Models So Equipped

6. REMOVE AND REINSTALL.

To remove front axle assembly, proceed
as follows: Remove drag link end from
steering arm and disconnect drive shaft.

Support front of tractor behind front ax-

le.

Support axle with a suitable floor

jack and remove front wheels. Remove

axle front pivot pin, then carefully lower
and move axle forward to remove from
axle support bracket.

Check clearance between pivot pin
(1-Fig. 8) and bushing (5) and between
differential housing (6) and rear bushing

SHOP MANUAL

Paragraph

7

Fig. 7—Cross-sectional view

of

front-wheel

drive

axie assembly.

1. Knuckle

pin 8.

Axle housing

R.H.

2.

Steering arm 9. Axle flange

3.

Bevel gear 10. Axle shaft

4.

Differential yoke 11. Bevel gear

shaft ' 12. Bevel gear

5.

Axle housing L.H. 13. Bevel gea r housing

6. Differential ease 14. Seal

7.

Pininon g ears 15. Axle case

16.

Bevel gear shaft

17.

Bevel gear

18.

Bearing case

19.

Bevel pinion shaft

20.

Coupling

21.

Drive shaft

22.

Differential side gear

23.

Ring gear

Fig. 8—Expioded view

of

front axte support

and

com-

ponents

for

tractors equip-

ped with front-wheel drive.

"0" rings (4,11

and

12)

are

not used

on

some models

and

front

bushing

(5)

is a two

piece assembly

on

some

models.

1.

Pivot pin & bracket

2.

Shims

3.

Thrust washer

4.

"()" rings

5.

Bushing

6. Differential housing

7.

Thrust washer

8. "(T' rings

9. Bushing

10.

Seal cover

11.

"0 " ring

12.

"O "ring

13.

Cover

14.

"0 " ring

15.

Axle mounting

bracket

Fig.

9—Use a spring scale

to

check force required

to

pivot

front axle. Refer

to

text

(9).

If

clearance exceeds

0.4 mm

(0.016

inch),

renew components

as

needed.

Renew

all

"0" rings.

Reinstall axle assembly

by

reversing
disassembly procedure using original
pivot

pin

shim pack (2). Apply grease

to

front

and

rear pivot bushings.

Use a

spring scale

to

measure force required

to pivot axle from lowest position

to

highest position

as

shown

in

Fig.

9.

Add

or remove pivot

pin

shims

as

necessary
to obtain recommended pivot force

of
49-117N (11-26 pounds). Recommended
lubricant

for

front axle

and

differential

case

is

SAE

90

gear

oil.

OUTER DRIVE ASSEMBLY

All Models

So

Equipped

7.

R&R AND

OVERHAUL,

To
remove outer drive assembly, first raise
and support front

of

tractor. Remove
front wheel, then disconnect drag link
(left side)

and tie rod.

Support drive

housing, remove

cap

screws mounting

housing

to

axle housing

and

withdraw

drive housing assembly from axle.

Re-

tain shims (3-Fig.

10) for use in
reassembly. Pull differential yoke shaft
(4) with bevel gear

(7) and

bearing

(6)

from axle housing.

To disassemble, remove axle flange

(33) with bevel gear

(26) and

axle

(34)

and allow

oil

to

drain into a suitable

con-

tainer. Remove inner bearing

(25) and

bevel gear from axle shaft. Remove

re-

taining rings

(27 nnd 28) and

thrust

washer (29), then press axle

out

of

bear-

ing

(30)

and

flange. Drive oil seal

(31)

out

of flange.

Remove knuckle support (right side)

or steering

arm

(left side), then remove

knuckle

pin

(10-Fig.

11).

Retain shims

(4)

for

use

in

reassembly. Remove lower

bearing

cap

(22-Fig.

10),

bearing

(21)

and bevel gear

(23).

Keep shims

(20)

together

for use In

reassembly.

T'ap

bevel gear shaft

(13)

upward

and

remove

upper bearing

(8) and

split collar

(9),

then

tap

shaft downward

and

separate

bevel gear housing

(10)

from axle case

(24).

Remove bearings

and oil

seal

(17)

from bevel gear shaft.

Examine gears

for

chipped, cracked

or missing teeth. Inspect bearings

for

roughness, corrosion

or

other damage.

Check diametral clearance

of

knuckle

pin (1 0-Fig.

11) in

bushing

(8). If

clearance exceeds

0.4 mm

(0.016 inch),

renew parts

as

needed. Renew

all " 0"

rings

and oil

seals. Lubricate parts with

clean

oil

prior

to

reassembly.

To rea s semb le, r e ver s e

the

disassembly procedure. Renew

all

gaskets.

"0"

rings

and

seals during

reassembly. Lubricate

lip of oil

seals

with gre ase d ur ing reas sembly.

Backlash between upper bevel gear

Paragraph 7 Cont.

KUBOTA

34

Fig. lO—Bxploded view of outer drive assembiy used on tractors equipped with front-wheel
drive. Some modeis have a spacer between bearing (6) and bevel gear (7) and retain gear with a cap

screw and washer Instead of snap rings (5 and 11).

1.

Axle housing

2.

"0" ring

3.

Shim

4.

Differential yoke shaft

5.

Snap ring

6. Bearing

7.

Bevel gear

8. Bearing

9. Split ring

10.

Bevel gear housing

11.

Snap ring

12.

Bevel gear

13.

Bevel gear shaft

14.

Bearing

15.

Snap ring

16.

Sleeve

17.

Oil seal

18.

Snap ring

19.

Bearing

20.

Shim

21.

Bearing

22.

Bearing cap

23.

Bevel gear

24.

Axle case

25.

Bearing

26.

27.

28.

29.

30.

31.

32.

33.

M.

Bevel gear
Retainer
Retaining ring
Thrust washer
Bearing
Oil seal
"0"

ring
Flange
Axle shaft

11

Pfg.

tt~ We i¥ of front-wheel drive steering linkage and knuckle pins.

1.

Drag link

2.

Arms

3.

Knuckle support R.H.

Fig. 12—Use a dial indicator to check backiash
between upper bevel gear and yoke shaft bevei
gear.

Add or remove shims (1) between housings

to obtain desired backlash.

(12-Fig. 10) and differential yoke shaft
gear (7) should be 0.15-0.30 mm
(0.006-0.012 inch). Use a dial indicator to
check backlash as shown in Fig. 12, then
add or remove shims (1) between bevel
gear housing and axle housing to obtain
desired ba cklash. Recom mended
backlash between lower bevel gear
(23-Fig. 10) and axle shaft bevel gear
(26) is 0.15-0.30 mm (0.006-0.012 inch).

Use a dial indicator to check backlash as
shown in Fig. 13, then add or remove

shims (2) at lower bearing cap to obtain
desired backlash. Tighten axle flange
mounting cap screws to a torque of

20-34 N-m (15-25 ft.-lbs.). Tighten bevel
gear case to axle housing mounting cap

screws to a torque of 98-132 N-m (75-95
ft.-lbs.).

Tighten knuckle support or

steering arm mounting nuts to a torque
of 80-90 N-m (60-65 ft.-lbs.), then

measure clearance between support and
pivot pin bracket with a feeler gage as

shown in Fig. 14. Adjust shim pack
under knuckle support as needed to ob-

tain desired clearance of 0.1-0.2 mm
(0.004-0.008 inch). Check end play of ax-

4.

Shim

5.

Tie rod

6. Tie rod end

7.

Steering arm

8. Bushing

9. "0" ring

10.

Knuckle pin

11.

Gasket

Fig. 13—Check backlash between iower bevel

gear and axle bevei gear and adjust as

necessary with shims (2) at lower bearing cap.

10

SHOP MANUAL

Paragraph 8

Fig. 14—Use a feeier gage to check knuckle pin
to support clearance. Add or remove knuckie

support mounting shims to obtain desired

ciearance.

le shaft using a dial indicator as shown
in Fig. 15. Maximum allowable end play

is 0.5 mm (0.020 inch). If end play is ex-

cessive, check condition of thrust

washer (29-Fig. 10) and retainer (27).
Refill unit with SAE 90 gear oil.

DIFFERENTIAL AND BEVEL

GEAR ASSEMBLY

All Models So Equipped

8. R&R AND OVERHAUL. Drain

oil from axle housing, then remove outer
drive assemblies and differential yoke

shafts as outlined in previous
paragraph. Disconnect drive shaft. Sup­port differential housing, then remove

front pivot pin and separate axle hous-

ing assembly from tractor.

To remove differential assembly,
remove mounting cap screws and
separate left axle housing (30-Fig. 16)
from differential housing (14). Remove
differential assembly from housing.
Remove bevel pinion case (6) mounting
cap screws, then withdraw pinion
assembly from differential housing. Re­tain shims for use in reassembly.

To disassemble differential, remove
carrier bearings (16 and 27) using a

21

20

25

Fig. 16--Exploded view of front-wheel drive differentiai and bevei drive gear assembiy. Spacer (9) is

not used on ail modeis.

1.

Adjusting nut

2.

Oil seal

3.

"0" ring

4.

Sleeve

5.

Bearing

6. Bearing ease

7.

"0" ring

8. Shims

9. Spacer

10.

Bearing

11.

Bevel pinion shaft

12.

Axle housing R.H.

13.

"0" ring

14.

Differential housing

15.

Shim

16.

Carrier bearing'

17.

Differential case

18.

Pinion shaft

19.

Dowel

20.

Thrust washer

21.

Side gears

22.

Thrust washer

23.

Bushing

24.

Pinion gear

25.

Bushing

2fi.

Ring gear

27.

Carrier tearing

28.

Shim

29.

"0" ring

'M).

Axle housing L.H.

suitable puller. Remove ring gear moun­ting caps screws and remove ring gear
(26),

side gear (21), thrust washer (20)

and bushing

(25).

Scribe match marks on
pinion gears (24) and side gear (21) so
gears can be reinstalled in their original
positions. Use a punch to remove pinion

shaft dowel pins

(19),

then withdraw pin-

ion shaft

(18)

and gears from differential

case.

Place bevel pinion drive gear (11) in a

suitable holding fixture, then remove
nut (1). Press bevel gear shaft out of
bearings and bearing case.

Inspect all gears and bearings for ex-

cessive wear or other damage. Max­imum allowable operating clearance be­tween differential side gears (21) and
differential case (17) and ring gear
bushing (25) is 0.4 mm (0.016 inch). Pi­nion shaft (18) to pinion gear bushing
(23) clearance should not exceed 0.3 mm
(0.012 inch). Renew all parts as needed.
Ring gear and pinion are available only
as a matched set.

Reassemble differential making cer­tain match mark s made during
disassembly are aligned. Check side

gear to pinion gear backlash using a dial

indicator as shown in Fig. 17. Backlash
should not exceed 0.4 mm (0.016 inch).

Fig. 15—Axial end piay of axie shaft shouid not
exceed 0.5 mm (0.020 inch). Use a dial indicator

as shown to measure end

piay.

Fig. 17^Backiash between side gears and pi­nion gears shouid not exceed 0.4 mm (0.016

inch).

Fig. 18—'Bevei pinion shaft bearing preload
should be adjusted to obtain recommended

roil-

ing torque of

1.27-167

N-m (11-15 in.tbs.)

11

Paragraph 8 Cont.

KUBOTA

Fig. 19—Rolling torque of bevel ptnton shaft
with differential assembly Instatted shouid be
within range of 1.96-2.94 N-m (17-26 tn.-tbs.).

Refer to text

Side gear thrust washers (2 0-Fig. 16)
are available in three different
thicknesses to adjust backlash to desired
value. Tighten ring gear mounting cap
screws to a torque of 61-68 N-m (45-50
ft.-lbs.).

Assemble bevel pinion shaft using new
bearings and oil seal. Tighten adjusting
nut finger tight, then reinstall pinion
shaft and case into differential housing.
Use a torque wrench to measure torque
required to turn pinion shaft as shown in

Fig. 18. Tighten adjusting nut (1-Fig.

16) to obtain recommended rolling tor-

que of

1.27-1.67

N-m (11-15 in.-lbs.).

Stake adjusting nut after bearing ad-

justment is completed.

Install differential assembly and ring
gear into differential case and reinstall

axle housing.Measure torque required to

Fig. 20—Use a diai indicator to check backlash

between ring gear and pinion. Recommended

backlash Is 0.15 mm

(0.006-0.010

inch).

Fig. 21—Exploded view of one piece drive shaft

assembly used on some modets.

1.

Front tube

2.

"0" ring 5. Drive shaft

3.

Snap ring 6. Rear cover

4.

Coupling 7. Gasket

Ftg. 22—Exploded view of
two-

piece drive shaft

assembly

with center carrier

bearing used on some

models.

1.

Snap ring

2.

Coupling

3.

Front drive shaft

4.

Front tube

5.

Gasket

6. Rear drive shaft

7.

Bearing case

8. Oil seals

9. Retaining rings

10.

Bearing

11.

Snap ring

12.

Center tube

13.

"0" ring

14.

Rear tube

rotate bevel pinion shaft and differential
as shown in Fig. 19. Rolling torque
should be within the range of

1.96-2.94

N-m (17-26

in.-lbs.).

Adjust as needed by

changing shim thickness (15 and 8- Fig.

16) in differential case and bevel pinion

case.

Check and adjust ring gear to bevel

pinion backlash as follows: Secure ring

gear by inserting a screwdriver through

oil drain hole in housing. Set dial in­dicator on bevel pinion shaft spline as
shown in Fig. 20, then move pinion shaft
and measure backlash. Recommended

II

Fig. 23—Transfer case is mounted to bottom of range transmission housing and is lubricated with
transmission ott.

Idler

gear assembly shown in Inset

(40

through

44)

is used on Modeis

L305,

L345

and

L355.

1.

Shift lever

2.

"0" ring

3.

Seal washer

4.

Plug

5.

Shift lever

6. Rubber guide

7.

Support

8. Guide

9. Shift arm

10.

Spring pin

11.

Cover

12.

Shaft

13.

Bearing

14.

Driven gear

15.

Bearing

16.

Sleeve

17.

Snap ring

18.

Oil seal

19.

Bearing

20.

Spacer

21.

Washers

22.

Thrust washer

23.

Inner race

24.

Bearings

25.

Idler gear

26.

Bearing

27.

Pto shaft

28.

Drive gear

29.

Bearings

30.

Bevel pinion shaft

40.

Spacer

41.

Shim

42.

Snap ring

43.

Thrust washers

44.

Washer

12

SHOP MANUAL

Paragraphs 9-12

backlash

is

0.15-0.25

mm

(0.006-0.010

inch).

If

measured backlash is excessive,

decrease shims

(15 - Fig.

16)

on differen-

tial case side and add shims (28)

of

same
thickness between left axle housing and
differential case.

If

backlash

is

insuffi-

cient, decrease shims (28) and

add

same
thickness

to

shims (15).

Complete reassembly

and

installation
of axle assembly. Refill axle housing
with

SAE 90

gear

oil.

DRIVE SHAFT

All Models

So

Equipped

9. Models L305, L345 and L355 use

a

two-piece drive shaft with a center

car-

rier bearing (Fig.

22). All

other models

use a one-piece drive shaft

as

shown

in

Fig. 21.

Removal

of

drive shaft consists

of
removing mounting screws from drive
shaft tubes, disengaging retaining rings
and sliding drive shaft

out of

couplers.

Remove center carrier bearing

and oil

seals

on

models

so

equipped.

Inspect shaft splines

and

couplers

for

excessive wear

or

other damage.

Reinstall drive shaft

by

reversing

removal procedure.

TRANSFER CASE

All Models

So

Equipped

10.

R&R AND OVERHAUL. Drive

gear (28 -

Fig.

28) and idler gear (25) are

located

in

range transmission housing.

Refer

to

appropriate transmission

sec-

tion

for

service procedures.

To service transfer case, first drain

oil
from transmission housing. Disconnect
drive shaft

and

shift linkage. Remove

transfer case mounting

cap

screws

and

lower unit from transmission housing.

To disassemble, remove

oil

seal

(18),

retaining ring

(17) and

plug

(4). Tap

shaft (12)

out

front

of

case

and

remove

gear (14). Drive pin (10) out

of

shift arm

(9)

and

remove shift lever (1).

To reas s embl e , reve r se

the
disassembly procedure. Apply liquid
gasket maker

to

surfaces

of

drive case

mounting gasket when reinstalling.

STEERING SYSTEM

MANUAL STEERING

All Models

So

Equipped

All models equipped with manual

steering box

use a

recirculating ball

nut

steering gear similar

to

type shown

in

P^ig.

24.

Fig. 24—Exploded view

of
manual steering gear
assembiy. Components
shown

in

inset

are

used

on
Models L185, L245 and

L28S.

1.

Nut

2.

Nut

3.

Side cover

4.

Gasket

5.

Shim

6. Adjusting screw

7.

Sector shaft

8. Gear case

9. Bushing

10.

Seal

11.

Pitman arm

12.

Bearings

13.

Ball nut assy.

14.

" 0" ring

15.

Column

16.

Nut

17.

" 0" rings

18.

Support bracket

19.

Spring

20.

Pin & rivet

21.

Ste ering shaft

22.

Bushing

23.

Seal

24.

Seai

25.

Shim

26.

Cover

27.

Column

28.

Support

29.

Bushing

11.

ADJUSTMENT. Steering wheel

free play should

be

within

the

range

of

20-50

mm

(13/16-2 inches) measured

at

steering wheel

rim. To

adjust steering

play, loosen locknut (2-Fi g.

24) and

turn adjusting screw

(6) to

obtain

desired free play. (Turning adjusting

screw clockwise will reduce free play.)

Tighten locknut

to

secure adjusting
screw.

On Models LI85, L245

and

L285,

steering shaft

end

play should

be ap-

proximately

0.2

mm (0.008 inch).

If

end

play

is

excessive, adjust

by

changing

cover shim (25) thickness.

12.

R&R AND

OVERHAUL.

To
remove steering gear assembly, first
remove steering wheel using a suitable
puller. Remove instrument panel, cowl
and fuel tank. Disconnect drag link from
pitman

arm.

Remove steering gear

mounting

cap

screws

and

withdraw

steering gear assembly.

To disassemble, first drain

oil

from

housing. Make sure match marks

are

present on pitman arm

(1 1 -

Fig.

24) and

sector shaft

(7),

then remove pitman
arm using a suitable puller. Remove side
cover mounting

cap

screws

and ad­justing screw locknut. Turn adjusting
screw (6)

to

remove side cover, then

tap

sector shaft

out

side cover opening.

Remove steering column

and

steering

shaft with hall

nut

assembly (13). Ball

nut

is

available only

as an

assernhknl

unit

and

disassembly

is not

recom-

mended.

To reassemble unit, reverse

the

disassembly procedure while noting^

the

following: Be sure

to

renew all "0" rings

and

oil

seals. Install sector shaft into

case

and

turn fully clockwise, then

in-

stall ball

nut and

-engage

it

with sector
gear. Install side cover using liquid
gasket

on

mounting surfaces

of

gasket.
On Models L185, L245 and L285, install
cover

(26)

with shim

(25)

thickness

re-

quired

to

obtain

0.2 mm

(0.008 inch)

steering shaft

end

play.

On all

other
models, install steering shaft assembly
without upper bushing (22) and seal (23).
Use a torque wrench (Fig. 25)

to

check
torque required

to

turn steering shaft

which should

be

less than

1.7 N-m (15

in.-lbs.).

Turn steering column (1) into

or

out

of

sector housing

to

obtain desired
turning torque, then tighten column
locknut

(2)

securely.

Be

sure

to

align

Fig. 25—Adjust steering shaft bearing preload
by turning steering coiumn

(1)

into

or out of

housing. Refer

to

text

1.

Steering colunm 2 Ijocknut

13

Paragraphs 13-14 KUBOTA

match marks when reinstalling pitman
arm. Refill unit with approximately 0.2
L (% pint) of SAE 90 gear oil.

Reinstall steering unit on tractor and

adjust steering wheel free play as

previously outlined.

POWER STEERING

Integral Type

13.

ADJUSTMENT. Steering wheel

free play should be within range of 25-50
mm (13/16-2 inches) measured at steer­ing wheel rim. To adjust free play, turn
adjusting screw

(1 - Fig.

26) clockwise to
reduce free play or counter-clockwise to
increase free play.

To check and adjust relief valve
pressure setting, connect a 0-20000 kPa
(0-3000 psi) pressure gage at test port
(2-Fig. 27) in steering valve housing.
Operate steering until oil is at operating
temperature. With engine running at

2600 rpm, turn and hold steering wheel
fully in one direction and observe

pressure reading when relief valve is ac-

tuated. Pressure should be 10000-10700
kPa (1450-1550 psi) on all models. To ad-

just relief valve pressure setting, turn

adjuster (1) to obtain desired opening
pressure.

If unable to obtain recommended
pressure, check hydraulic pump output
as outlined in paragraph 19. If pump
output is satisfactory, remove and in­spect relief valve poppet and spring
(33-Fig.28).

14.

R&R AND OVERHAUL. To

remove steering gear assembly, first
remove steering wheel using a suitable
puller. Remove instrument panel, cowl
and fuel tank. Disconnect drag link from

pitman arm using a suitable puller.
Disconnect hydraulic oil tubes, remove

steering box mounting cap screws and
withdraw steering gear assembly.

To disassemble, first place match
marks on pitman arm and sector shaft.
Use a suitable puller to remove pitman
arm. Drain oil from housing. Remove
steering column

(44 - Fig.

28). Drive out

rivet and spring pin (43) and remove

steering shaft (45), then unbolt and

remove top cover (38). Secure worm

shaft (18) and remove locknut (36).
Separate valve assembly and thrust

bearings from housing. Remove side

cover mounting cap screws, then turn
adjusting screw (5) clockwise to remove
side cover (2). Remove sector shaft
through side cover opening. Remove re­taining ring (12) and bottom cover (13).
Withdraw ball nut assembly (21).

NOTE:

Ball nut assembly is available
only as a complete unit and disassembly
Is not recommended.

Fig. 26—Turn steering gear
adjusting screw (1) to adjust
steering wheel free

play.

Fig. 27—To check integral
type power steering
pressure, attach a pressure
gage at test port (2).
Pressure setting can be ad­justed by turning adjuster

(1).

Refer to text

1.

Nut

2.

Side cover

3.

"0" ring

4.

Adjuster

5.

Adjusting screw

6. "U" packing

7.

Bearing

8. Sector shaft

9. Bearing

10.

"U" packing

11.

Oil seal

12.

Snap ring

13.

End cover

14.

"0" ring

15.

Bearing

16.

"0" ring

17.

Seal ring

14

13-

'^^

12

33

Ftg. 28—Exploded view of Integral type power steering used on some models.

18.

W orm sh aft

19.

Seal ri ngs

20.

Spr ing

21.

Ball n ut

22.

Seal ri ng

23.

" 0" rin g

24.

" 0" ri ng

25.

Seal ring

26.

Hou sing

27.

" 0" ri ng

28.

"O" rin g

29.

Seal r ing

30.

" 0" ri ng

31.

W ashe rs

32.

Thrust b earing

33.

Relie f valve ass y.

;{4.

R eaction pi stons

<!

spring

35.

Valv e spool

36.

Nu t

37.

"0 " ring

38.

Up per c over

39.

Be aring

40.

Oil seal

41.

S nap r ing

42.

Nut

43.

Rive t & pin

44.

Col umn

45.

St eeri ng sh aft

46.

Bus hing

47.

Se al

48.

Valv e housing

14

SHOP MANUAL

Paragraph 14 Cont.

4 3 2

Fig.

29—Open side of sector shaft

"U"

packing

(3)

should face Inward and open side of seal (4)

should face outward.

1.

Gear housing 3. "I!" packing

2.

Needle bearing 4. Seal

Fig.

30—Be sure

"O"

ring (1)

is installed behind

Teflon

seai

ring (2)

when reinstailing worm shaft

seals in housing.

Fig. 31—View of baii nut seais correctly instail-

ed.

"O"

ring must be behind Tefion rings.

1.

Ball nut assy.

2.

Teflon seal ' 4. "0" ring

3.

Teflon seal 5. "()" ring

Separate components of valve
assembly and inspect for wear, scoring
or other damage. Valve spool (35) and
valve housing (48) must be renewed as a
matched set. Check all components for

Fig. 33—Side cover seai and bearing Installa­tion.

Be sure open side of

"U"

packing faces

in-

ward.

3.

"IJ" packing

4.

Needle bearing

1.

"O'Ving

2.

Side cover

1

2

3

4

ifi

1!

J

Fig. 34—Upper cover bearing and seal installa-

tion.

Open side of oii seai

(3)

shouid face bearing

(4).

1.

nppor cover 3. "O" ring

2.

Snap ring 4. Bearing

wear and correct fit and renew any
which do not meet the following
specifications: Clearance between
cylinder and ball nut should be

0.030-0.079 mm (0.0012-0.0031 inch).
Worm shaft axial end play in ball nut
should be 0.02 mm (0.0008 inch) and
maximum allowable end play is 0.12 mm
(0.0047 inch). Worm shaft must rotate
smoothly in ball nut. Worm shaft lower
bearing journal outside diameter should
be 28.562-28.575 mm (1.1245-1.1250 in­ches) with minimum allowable diameter
of 28.475 mm (1.1211 inches). Clearance
between valve housing and spool should
be 0.008-0.015 mm (0.0003-0.0006 inch)
and maximum allowable clearance is

0.025 mm (0.001 inch). Be sure that
spool and sleeve are free of scratches,
nicks or burrs and that spool slides
smoothly in sleeve. Sector shaft bearing

journal dia m eter should be

38.059-38.075 mm (1.4984-1.4990 in­ches).

Renew shaft if diameter is less

than 38.025 mm (1.4970 inches).

When renewing needle bearings, posi­tion bearings in housings so press force
is applied against side of bearing with
manufacturer's marks. Install new oil
seals,

"0" rings and Teflon seal rings as
shown in Figs. 29 through 34. Lubricate
seals and "0" rings prior to reassembly.
Apply molybdenum disulfide "Molycoat"
to steering column bushing(46-Fig. 28)
and oil seal (47).

Reassemble steering unit by reversing
the disassembly procedure. Be sure to
align "P" marks on valve spool (5-Fig.

35) and valve housing (2). Position ball
nut and worm shaft assembly, valve
housing assembly and thrust bearings
into steering gear housing, then install
special mounting plate

(1 - Fig.

36) t o re-

tain components in housing. (Special

plate can be fabricated using dimensions

shown in Fig. 36A.) Turn worm shaft
clockwise, tighten locknut hand tight
and stake locknut threads with a pin
punch. Install sector shaft and tighten
side cover mounting cap screws to 40-55
N-m (30-40 ft.-lbs.) torque. Remove

Fig.

32—View of iower cover seai

ring

and bear-

ing installation.

1.

Teflnn sea!

2.

Needle bearing :i. "O" ring

Fig.

35—Be sure to aiign

"P"

marks on spool

(5)

and valve

(2) when reassembiing.

1.

Relief valve assy.

2.

Valve housing

3.

F^istons

4.

F^i.stons

5.

Spool

6. Spring

7.

Spring

6

7

15

Paragraphs 15-17

KUBOTA

Fig. 36—Install speciai
mounting plate (1) to retain
ball nut and thrust bearings
while tightening worm shaft

tocknut See Fig. 36A.

Fig, 38—As a finai assembly check, measure
torque required to start rotation of worm shaft

Torque should not exceed 1.7 N-m (15 In.-lbs.)

special plate and install top cover.
Tighten retaining screws to a torque of

40-55 N-m (30-40 ft.-lbs.). Align match

marks and install pitman arm onto sec­tor shaft. Tighten retaining nut to a tor­que of 120-155 N-m (90-115 ft.-lbs.).

Check backlash between sector gear
and ball nut using a dial indicator as
shown in Fig. 37. Turn adjusting screw
(5-Fig. 28) as required to obtain recom­mended backlash of 0.1-0.4 mm
(0.004-0.016 inch). To check for proper
final assembly of steering gear, use a
torque wrench as shown in Fig. 38 to
measure torque required to start rota­tion of worm shaft. Torque should be

less than 1.7 N-m (15 in.-lbs.). If
measured torque exceeds 1.8 N-m (16

Ftg. 36A—Mounting plate can be fabricated us-

ing dimensions shown.

37—Check sector gear backlash using a

dtat Indicator.

in.-lbs.),

c orrect problem before
reinstalling unit on tractor. Install steer­ing shaft and column tube and tighten
nut to a torque of 98-127 N-m (75-94
ft.-lbs.).

Reinstall steering gear on tractor by

reversing removal procedure. On

models equipped with separate reservoir

tank, refill hydraulic system with ap-

proximately 1.5 L (1.6 quarts) of Kubota
UDT fluid. Adjust steering pressure
relief valve setting as previously out-

lined.

Booster Type

15.

On models equipped with booster
type power steering, a manual steering
gear assembly is used which is identical
to steering gear outlined in paragraphs

11 and 12. The power booster unit is
mounted on left side of tractor and
transfers hydraulic power assist directly
to steering drag link which is attached to
booster unit. The booster unit consists of
a hydraulic cylinder with a valve housing
built into the cylinder. When steering
wheel is turned, valve spool shifts and
directs hydraulic fluid to one side of
power cylinder which actuates cylinder
and assists in turning front wheels.

Fig. 39—Exploded view of

power steering booster unit

used on some tractors.

1.

Retainer

2.

Seal

3.

Ball stud

4.

Housing

5.

Stop plate

6. Screw

7.

Spring

8. Seats

9. Actuator rod

10.

Sleeve

11.

Pin

12.

Cap

13.

Washer

14.

Valve spool retainers

15.

Centering spring

16.

Reliefvalve assy.

17.

"O" rings

18.

Valve assy.

19.

Nut

20.

"0" ring

. 21. Cylinder

22.

Piston ring

23.

Piston & rod

24.

"0" ring

25.

Cylinder end

26.

Rod seal assy.

16.

ADJUSTMENT. Steering wheel

free play is adjusted as outlined in
paragraph 11.

To check and adjust booster relief
valve pressure setting, proceed as
follows: Be sure hydraulic fluid is at nor­mal operating temperature. Remove
plug from test port in bottom of valve
housing and install a pressure gage as
shown in Fig. 39A. Operate engine at
rated speed, turn steering wheel in one
direction until front wheels stop and
observe pressure gage reading. When
relief valve opens, pressure should be
approximately 6900 kPa (1000 psi). To
adjust pressure, turn relief valve ad­justing screw (16-F ig. 39), located in
valve housing, clockwise to increase
pressure or counter-clockwise to reduce
pressure.

17.

R&R AND OVERHAUL. To

remove booster unit, first disconnect
hydraulic hoses and drain oil. Disconnect
drag link end from booster unit. Discon­nect booster unit from front mounting
bracket and pitman arm and remove
from tractor.

To disassemble unit, first move piston
rod in and out of cylinder to drain oil.
Remove retainer ( 1-Fig. 39) and dust

16

SHOP MANUAL

I

seal (2) from spool housing (4). Remove
retaining cap screws, then separate
spool valve assembly, valve housing and
cylinder assembly. Remove nut (19)
securing valve spool, then separate
valve spool, center spring (15) and re­tainers (14) from actuator rod (9).
Remove stud adjusting screw (6), spring
(7),

seats (8), stud (3) and sleeve (10)

from housing

(4).

Count number of turns
required to remove relief valve adjuster
screw (16) from valve body. Unscrew
piston rod retainer (25) and withdraw
piston and rod assembly. Remove and
discard all seals and "0" rings.

Clean and inspect all parts for ex­cessive wear, scoring or other damage.
Renew components which do not meet
following specifications: Maximum
allowable clearance between valve spool
and housing is 0.04 mm (0.0016 inch).
Maximum allowable clearance between
piston and cylinder bore should not ex­ceed 0.2 mm (0.008 inch).

To reassemble booster unit, reverse
the disassembly procedure. Renew all
seals and "0" rings. Lubricate all parts
with clean hydraulic oil prior to
reassembly. Tighten cylinder rod end

(25) to torque of 79-98 N-m (60-70

ft.-lbs.).

When reinstalling relief valve

assembly, turn adjuster screw into valve

Fig. 39A—TO check relief
vaive opening pressure on

booster type

steering^

Install
a pressure gage in valve
housing test port as shown.

Refer to text

body same number of turns required for
removal. Apply light coat of grease to
valve sleeve and ball stud (3). Reassem­ble valve spool and centering spring be­ing careful not to damage "0" ring in cap
(12).

Tighten retaining nut to a torque of

7.8 N-m (70 in.-lbs.) Assemble actuator
housing, valve housing and cylinder
assembly and tighten mounting cap

screws evenly to a torque of 19.6 N-m

(15 ft.-lbs.).

To reinstall booster unit, reverse the

removal procedure. Operate steering in
both directions several times to purge
air from system. Check and adjust relief

valve pressure setting as outlined in

paragraph 16.

STEERING PUMP

18.

Hydraulic power supply for
power steering system on Models L235,
L275 and L305 is the hydraulic system
pump mounted on right side of engine.
Pump output is first routed to a flow
divider valve which directs a priority
flow of

oil

to power steering, the remain­ing pump flow is directed to hitch con­trol valve.

On Models L345 and L355, a separate

hydraulic pump is used for steering

Paragraphs 18-20

system. The pump is mounted in tandem
behind hydraulic hitch system pump. All
pumps are located on right side of
engine and are driven by engine fuel
camshaft.

All Models So Equipped

19.

PRESSURE TEST. To check

pump discharge pressure, disconnect
pump pressure outlet pipe and connect a
20000 kPa (3000 psi) pressure gage with
flow control valve as shown in Fig. 40 or

41.

Direct return hose from flow control

valve back into reservoir.

CAUTION:

With test equipment con­nected as outlined, pressure reiief vaive
wiil be eiiminated. BE SURE fiow controi
vaive is fuiiy open before starting engine.

DO NOT ciose controi vaive further after
specified pressure is reached. Otherwise,
pump damage wiii occur.

With flow control valve open, start
engine and operate until fluid reaches
operating temperature. Set engine
speed at 2600 rpm., then slowly close
flow control valve until pump delivery
pressure is within range of 13250-14700
kPa (1920-2130 psi). If specified
pressure cannot be obtained, hydraulic
pump should be removed and repaired
or renewed.

Models L235, L275 and L305

20.

R&R AND OVERHAUL. To

remove hyd rau lic p ump , fir st
thoroughly clean pump and hydraulic
lines.

Disconnect hydraulic lines from
pump. Remove pump mounting cap
screws and withdraw pump assembly.

On Models L235 and L275, remove
hydraulic filter and base. On all models,
place a scribe mark across pump sec­tions,

then remove end cover (10-Fig.

42 or 43). Carefully separate pump com-

Fig. 40—Pressure gage and
flow control valve connected
to check hydraulic pump
discharge pressure on
Modeis L235, L275 and L305.

1.

H ydraul ic pu mp

2.

I*r(.'ssure gag e

'A. F^low co ntrol val ve

4.

R etur n to res ervoir

Fig. 41—On Models L345 and L355, connect test
gage and fiow control vatve as shown to check

output of steering pump (2).

17

Paragraph 21

KUBOTA

ponents noting location so parts can be
reinstalled in their original position.
Remove oil seal from pump front plate if
renewal is necessary.

Inspect all parts for excessive wear,
scoring or other damage. The only parts
available are seal rings and front oil seal.
Renew pump if the following specifica­tions are not met. Clearance between
gear outside diameter and case inside
diameter should not exceed 0.15 mm
(0.006 inch). Maximum allowable
clearance between bushing and gear

shaft is 0.12 mm (0.005 inch).

Lubricate all parts with clean oil dur­ing reassembly. Renew all seal rings and
front oil seal. Assemble pump sections
aligning match marks made during
disassembly. Tighten end cover moun­ting cap screws evenly to a torque of
32-39 N-m (24-29 ft.-lbs.).

Be sure oil supply and discharge tube
"0"

rings are in place when reconnecting
to pump. Check fluid level of reservoir
and add recommended hydraulic oil if
necessary. Start engine and turn steer­ing from side to side to purge air from
system.

Models L345 and L355

21.

R&R AND OVERH AUL .

Thoroughly clean outside of pump and
surrounding area prior to removal.
Disconnect hydraulic lines, remove
pump mounting cap screws and
withdraw pump assembly.

Prior to disassembling pump, scribe a
mark across pump sections to aid in
reassembly. Remove end cover (1- Fig.

44) and carefully separate components
from case (9). Note location of com­ponents so they can be reinstalled in
their original positions.

Inspect all parts for excessive wear,
scoring, corrosion or other damage and
renew as necessary. If the following
wear specifications are exceeded, renew
pump assembly. Inside diameter of
pump case must not exceed 31.09 mm
(1.224 inches). Maximum allowable
clearance between bushing and gear
shaft is 0.18 mm (0.007 inch).

Lubricate all parts with clean oil dur­ing reassembly. Renew all seal rings and
oil seal. Align match marks when
reinstalling end cover and tighten cap
screws evenly to a torque of 26-32

N • m
(19-24 ft.-lbs.) Be careful not to damage
"0"

ring (12) when assembling pump to
adapter plate (13). Tighten mounting
cap screws to a torque of 24-27 N-m
(18-19 ft. -lbs.). Make sure "0" rings are
in place when reconnecting oil supply
and discharge tubes to pump.

Refill reservoir with rcommended

hydraulic fluid. Start engine and cycle

steering several times to purge air from
system.

Fig. 42—Expioded view of
hydraulic pump used on

Models 1235 and L275.

1.

Snap ring

2.

Oil seal

3.

Case

4.

"0" rings

5.

Bushings >

6. Idler gear

7.

Drive gear

8. "0" ring'

9. "O"ring

10.

End cover

Ftg. 43—Exploded vtew of
hydraulic pump used on

Model L305.

1.

Oil seal

2.

Front cover

3.

Seal ring

4.

Bushing seal

5.

Gasket ring

6. Bushings

7.

Case

8. Drive gear

9. Idler gear

10.

End cover

IS

15

16

1.

End cover

2.

"0" ring

3.

Support ring

4.

Seal ring

5.

Bushing

6. Idler gear

7.

Drive gear

8. "0" ring

9. Case

10.

Oil seal

11.

Drive coupling

12.

"0" ring

13.

Adapter plate

14.

Center plate

15.

Seal ring

16.

Bushing seal

17.

Gasket ring

18.

Bushing

19.

Drive gear

20.

Idler gear

21.

Case

22.

Front cover

23.

Oil seal

Fig. 44—Expioded vtew of tandem hydrauiic pumps used on Models L345 and L355. Rear pump

(Items 1 through 10) supplies power steering system.

18

SHOP MANUAL

Paragraphs 22-24

ENGINE AND COMPONENTS

R&R ENGINE

All Models

22.

To remove engine and clutch as a
unit, first drain cooling system, engine
oil,

transmission oil, power steering

reservoir (if equipped) and front wheel
drive differential housing (if equipped).
Remove front axle assembly as follows:
Remove hood, side panels and upper
support rail (if equipped), muffler and
battery. Disconnect radiator hoses and
air cleaner hose. Disconnect drag link
end using a suitable puller. On front
wheel drive models, unbolt and remove
drive shaft. On all models, support
tractor under clutch housing and sup­port front end unit with a suitable hoist
or splitting stand. Remove front axle
bracket mounting cap screws, then roll
front end away from engine. To
separate engine from clutch housing,
disconnect wiring to engine as necessary

Disconnect fuel supply line, fuel return
line and hydraulic hoses and tubes.

Disconnect throttle control linkage,
engine stop rod (if equipped), hour­meter cable and decompression cable.

Support engine with a suitable hoist,
remove cap screws securing flywheel
housing to clutch housing and separate
engine from transmission.

To reinstall engine, reverse the
removal procedure. Tighten clutch hous­ing mounting cap screws to a torque of
49-54 N-m (36-41 ft.-lbs.). Tighten front
axle bracket fasteners to the following
torques: MIO nut to 61-71 N-m (45-50
ft.-lbs.),

MIO bolt to 48-56 N-m (;-i6-41
ft.-lbs.) and M12 nut or bolt ot 78-90
N-m (58-66 ft.-lbs.).

CYLINDER HEAD

All Models

23.

To remove cylinder head, first
drain cooling system and disconnect bat­tery cables. Remove hood, muffler and
side covers (if equipped). Remove upper
radiator hose, coolant return hose and
intake manifold hose. Disconnect decom­pressor control cable. Remove injection
lines and nozzle assemblies and cap all
exposed fittings to prevent entry of dirt.
Remove alternator adjusting bracket.
Remove valve lever cover. Remove
valve levers an(i shaft assembly and
withdraw push ro(is. Remove cap screws
and nuts securing cylinder head and lift
head off cylinder block.

One or more shims may he installed

between gasket and cylinder head to ad-

just clearance between cylinder head

and piston tops. Identify shims when

cylinder head is removed, then install an
equal number of shims when head is
reinstalled. To check piston to head
clearance, insert a soft lead wire
through injection nozzle holder hole.

Rotate crankshaft by hand until lead
wire is fiattened by piston top. Measure
thickness of fiattened wire to determine
top clearance which should be 0.7-0.9
mm (0.028-0.035 inch).

NOTE:

Because of minimum amount of
clearance that exists between vaives and
piston tops, ioosen vaive iever adjusting
screws before reinstailing vaive ievers
and shaft assembiy to prevent possibie
damage to vaives.

Check cylinder head surface for
distortion using a straightedge and
feeler gage. If a 0.05 mm (0.002 inch)
feeler gage can be inserted between
cylinder head and straightedge, head
surface should be refaced with a surface
grinder. A maximum of 0.5 mm (0.020
inch) of material may be removed to true
cylinder head surface. Refer to
paragraph 25 for valve head recession
specifications.

When installing cylinder head, use
new head gasket and install shims (if us­ed) between gasket and cylinder head.
Be sure sealing surfaces are clean and

dry. Apply light coat of engine oil to
threads of retaining nuts and cap

screws. Tightening torque on all models
is 73.5-78.4 N-m (55-58 ft.-lbs.). On all
models, tighten nuts and cap screws
evenly in three stages using recommend­ed sequence shown in Fig. 45.

Adjust valve clearance as outlined in
paragraph 25 and compression release
mechanism as outlined in paragraph 24.
Retorque cylinder head cap screws and
nuts after running engine for approx­imately 30 minutes using proper tighten­ing sequence.

COMPRESSION RELEASE

All Models

24.

Compression release mechanism
is contained within valve lever cover.
When decompressor knob is pulled,
decompressor shaft rotates allowing ad-

justing screws to contact exhaust valve

levers. The decompressor screws will
hold exhaust valves slightly open, reduc­ing compression resistance when start­ing engine, until decompressor knob is
returned to normal operating position.

To adjust compression release,
remove adjusting covers from valve
lever cover (Fig. 46). Pull decompressor
knob out, then turn crankshaft by hand
until exhaust valve being adjusted is

completely closed (piston at TDC com­pression stroke). Turn decompressor

screw down until it contacts valve lever.

Flywheel side

Fig. 45—When tightening
cyiinder head boits, use ap­propriate sequence shown

for two, three or four cylinder

engines.

Bolt

Nut

19

Paragraphs 25-26

KUBOTA

Compression release

position

Ftg. 46—Cross-sectional
view of decompressor mech­anism and adjustment point

0.750 to 1.125mm

0.0295 to 0.0443 in.

then turn screw down an additional 1 to

IV2 turns to obtain specified valve open­ing of 0.750-1.125 mm (0.030-0.044
inch).

Tighten locknut while holding ad-

justing screw. Repeat adjustment pro-

cedure for remainder of exhaust valves.

NOTE:

After adjustment is completed,
puil knob out and turn cranlcshaft by hand
to make certain valves do not contact
piston tops.

VALVES AND SEATS

All Models

25.

Intake and exhaust valves are
not interchangeable. All valves seat
directly in cylinder head. Valve face and

seat angles are 45 degrees for all valves.
Recommended valve seat width is 2.1
mm (0.080 inch). Valve stem diameter is

7.960-7.975 mm (0.3134-0.3140 inches)

t

for all valves. Face of valves should be
recessed

1.1-1.3

mm (0.043-0.051 inch)
below surface of cylinder head. Max­imum allowable recession is 1.6 mm
(0.063 inch).

Whenever valves are renewed or
reseated, be sure to adjust compression
release mechanism as previously out­lined.

Valve clearance, gap between valve
stem end and valve lever, is adjusted
with engine cold on all models. Recom­mended g ap is 0.18-0.22 mm

(0.007-0.009 inch) for both intake and
exhaust on all models.

CAUTION:

Due to close ciearance be­tween valves a pistons, severe damage
can resuit from inserting feeler gage be-

tween vaive stem and vaive iever with
engine running. DO NOT attempt to adjust
vaive clearance with engine running.

To adjust valve clearance, proceed as
follows: Loosen valve lever adjusting
screw locknuts. Rotate crankshaft by
hand to position number one piston at
top dead center of compression stroke.
Using a feeler gage to measure
clearance, adjust valves for number one
cylinder. Adjust remaining valves in se-

quence of firing order after positioning
each piston at top dead center of com­pression stroke.

VALVE GUIDES

All Models

26.

Intake and exhaust valve guides
are semi-finished and must be reamed
after installation in cylinder head. In­take and exhaust valve guides are not in-

terchangeable as exhaust guide is
equipped with a "carbon scraper" at
lower end of guide (Fig. 47). Press new
guides into cylinder head until guide
shoulder is seated against surface of
head. All models are equipped with cup­type stem seals which fit over stem end
of valve guide.

Desired operating clearance of valve
stem in guide is 0.04-0.07 mm
(0.0016-0.0028 inch). Maximum

14

Fig. 48—Exploded vtew of
valves and valve lever

assembly.

1.

Intake valve

2.

Exhaust valve

3.

Valve stem seal

4.

Spring

5.

Retainer

6. Keepers

7.

Cap

8. Snap ring

9. Washer

10.

Bushing

11.

Adjusting screw

12.

Spring

13.

Valve lever

14.

Bracket

15.

Shaft

10

Fig. 47—Exhaust valve guide is equipped with a
"carbon scraper" (C) and is not interchangeable
with Intake guide. Note scraper area when

measuring inside diameter

(A

and B) of guides.

20