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New Holland Tractor Workmaster 50 / Workmaster 60 / Workmaster 70 / Tier 4B (final). SERVICE MANUAL - page 13

Steering - Hydraulic control components

Power steering control valve - Assemble

WARNING

Avoid injury!

Handle all parts carefully. Do not place your hands or fingers between parts. Use Personal Protec-

tive Equipment (PPE) as indicated in this manual, including protective goggles, gloves, and safety

footwear.

Failure to comply could result in death or serious injury.

W0208A

CAUTION

Pinch hazard!

Always use suitable tools to align mating parts. DO NOT use your hand or fingers.

Failure to comply could result in minor or moderate injury.

C0044A

1. Place the two flat neutral position springs in the slot.

Place the curved springs between the flat ones and

press them into the place.

GNIL14TR04508AA

1

2. Line up the spring set.

GNIL14TR04509AA

2

3. Guide the spool into the sleeve. Make sure that spool

and sleeve are placed correctly in relation to each other.

GNIL14TR04510AA

3

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Steering - Hydraulic control components

4. Assemble spool and sleeve.

GNIL14TR04511AA

4

NOTE: When assembling spool and sleeve, only two pos-

sible ways of positioning the spring slots are correct.

There are three slots in the spool and three holes in

the sleeve in the end of the spool/sleeve, opposite to

the end with speing slots. Place the slots and holes

opposite each other so that parts of the holes in the

sleeve are visible through the slots in the spool.

GNIL14TR04512AA

5

5. Press the springs together and push the neutral posi-

tion springs into place in the sleeve.

GNIL14TR04513AA

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6. Line up the springs and centre them.

GNIL14TR04514AA

7

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Steering - Hydraulic control components

7. Guide the ring down over the sleeve.

NOTE: The ring should be able to move - free of the

springs.

GNIL14TR04515AA

8

8. Fit the cross pin into the spool/sleeve.

GNIL14TR04516AA

9

9. Fit bearing races and needle bearing as shown on be-

low drawing.

GNIL14TR04517AA

10

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Steering - Hydraulic control components

Assembly pattern for standard bearing

1. Outer bearing race

2. Needle bearing

3. Inner bearing race

4. Spool

5. Sleeve

GNIL14TR04518AB

11

*The inside chamfer on the inner bearing race must face

the inner spool.

Installation of O-ring

1. Turn the steering unit until the bore is horizontal in po-

sition. Guide the outer part of the assembly tool into

the bore for the spool/sleeve.

GNIL14TR04519AA

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Steering - Hydraulic control components

2. Grease O-ring and king ring/roto glyd with hydraulic oil

and place them on the tool.

GNIL14TR04520AA

13

3. Hold the outer part of the assembly tool in the bottom

of the steering unit housing and guide the inner part of

the tool right to the bottom.

GNIL14TR04521AA

14

4. Press and turn the O-ring/kin-ring into position in the

housing.

GNIL14TR04522AA

15

5. Draw the inner and outer parts of the assembly tool

out of the steering unit bore, leaving the guide from the

inner part in the bore.

GNIL14TR04523AA

16

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Steering - Hydraulic control components

Installation of lip seal

CAUTION

Pinch hazard!

Always use suitable tools to align mating parts.

DO NOT use your hand or fingers.

Failure to comply could result in minor or mod-

erate injury.

C0044A

1. Lubricate the lip seal with hydraulic oil and place it on

the assembly tool.

GNIL14TR04524AA

17

2. Guide the assembly tool right to the bottom.

GNIL14TR04525AA

18

3. Press and turn the lip seal into place in the housing.

GNIL14TR04526AA

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4. With a light turning movement, guide the spool and

sleeve into the bore.

NOTE: Fit the spool set holding the cross pin horizontal.

GNIL14TR04527AA

20

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Steering - Hydraulic control components

5. The spool set will push out the assembly tool guide.

The O-ring and kin ring/roto glyd are now in position.

GNIL14TR04528AA

21

6. Turn the steering unit until the bore is vertical again.

Put the check valve ball into the hole indicated by the

arrow.

GNIL14TR04529AA

22

7. Screw the threaded bush lightly into the check valve

bore. The top of the bush must lie just below the sur-

face of the housing.

GNIL14TR04530AA

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8. Place a ball in the two holes (1).

GNIL14TR04531AB

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Steering - Hydraulic control components

9. Place a new pin in the same two holes.

GNIL14TR04538AA

25

10. Grease the O-ring with mineral oil approximately vis-

cosity 500 mm2/s at 20 °C (68 °F).

GNIL14TR04532AA

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11. Place the distributor plate so that the channel holes

match the holes in the housing.

GNIL14TR04533AA

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12. Guide the cardan shaft down into the bore so that the

slot is parallel with the connection flange.

GNIL14TR04534AA

28

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Steering - Hydraulic control components

13. Place the cardan shaft as shown - so that it is held in

position by mounting fork.

GNIL14TR04535AA

29

14. Grease two O-rings with mineral oil approximately vis-

cosity 500 mm2/s at 20 °C (68 °F) and place them in

the two grooves in the gear rim. Fit the gearwheel and

rim on the cardan shaft.

GNIL14TR04536AA

30

NOTE: Fit the gear wheel (rotor) and cardon shaft so that a

tooth base in the rotor is positioned in relation to the shaft

slot as shown. Turn the gear rim so that the seven through

holes match the holes in the housing.

GNIL14TR04537AA

31

15. Fit the spacer, if any.

GNIL14TR04539AA

32

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Steering - Hydraulic control components

16. Place the end cover in position.

GNIL14TR04540AA

33

17. Fit the special screw with washer and place it in the

hole (1).

GNIL14TR04541AB

34

18. Fit the six screws with washers and insert them.

Cross-tighten all the screws and the rolled pin with

a torque of 3.0 ± 0.6 daNm. The steering motor can

now be function tested.

GNIL14TR04542AA

35

19. Fit the dust seal ring in the housing using suitable tool

and a plastic hammer.

GNIL14TR04543AA

36

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Steering - Hydraulic control components

20. Press the plastic plugs into the connection ports.

NOTE: Do not use a hammer.

GNIL14TR04544AA

37

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Steering - Hydraulic control components

Steering circuit relief valve - Pressure test

NOTE: There is no relief valve in steering pump and the

following pressure test must only be performed as speci-

fied below. Failure to observe this precaution may result in

severe damage to the hydraulic pump.

1. Turn steering onto full left-hand side lock.

2. Disconnect left-hand side turn feed hose at steering

cylinder.

3. Install power steering pressure checking kit.

(special

tool number 292870 with adapter 271318). As shown

in Fig.

1.

4. Start tractor and set engine speed to 1450 RPM. Turn

GNIL14TR04485AB

1

steering wheel to the left with a pull of approximately

22 N (5 lb) and observe the pressure reading.

NOTE: The use of a force greater than 22 N (5 lb) at the rim

of the steering wheel may lead to slightly inaccurate read-

ings due to the pumping action of the hydrostatic steering

motor.

If the steering test was satisfactory but pressure read-

ings are away from specification the relief valve in the

steering motor must be adjusted.

The pressure reading should be 110 - 125 bar (1595 -

1812 psi).

5. If the system pressure is not to specification proceed to

relief valve adjustment.

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Steering - Hydraulic control components

Steering circuit relief valve - Adjust

NOTE: To adjust the steering system relief valve it is necessary to remove the steering motor from the steering bracket,

to gain access to the hexagon headed adjusting screw.

1. Disconnect the steering motor from the steering

bracket, and remove from the tractor refer to Power

steering control valve - Remove (41.200)

2. Fabricate suitable test hose to connect pump pipeline

to steering motor. Connect locally procured ‘T’ joint be-

tween test hose and steering motor and Install pressure

gauge as in Figure 1.

3. Cap all connections to steering cylinder.

4. Connect the return hose normally. If required connect

with extra hose and suitable adopter.

5. Start the engine and idle between

1450

-

1500 RPM.Run the tractor until the transmission oil

reaches normal working temperature.

6. With the engine running, turn the steering motor shaft

to obtain full lock. The pressure gauge reading should

read 10300 kPa (1494 psi).

7. If the pressure readings are not correct, reset the ad-

juster, (1), using an 6 mm (0.2 in) hexagon key.

20096280

1

1.

Adjuster

6.

Hose for pump supply to steering motor

2.

Steering shaft

7.

Pressure gauge 20684 kPa (3000 psi)

3.

Relief valve

8.

Cap

4.

Steering Motor Output Hose

9.

Spring

5.

Tractor tubes to steering cylinder

10.

Plug

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Steering - Cylinders

Steering cylinder - Remove - 2WD

GNIL14TR04545FB

1

1. Stand the tractor on a hard level surface and position

the front wheel in the straight ahead position.

2. Disconnect flexible pipes, cap the open pipe ends and

remove hose clamps.

NOTE: Position of flexible pipes and orientation of connec-

tors must be the same upon re-assembly.

3. Remove the nut securing the cylinder rod ball joint to

the steering arm and separate the joint, 1.

4. Remove the nut securing the steering cylinder on front

axle beam.

5. Remove the steering cylinder from the tractor and re-

trieve washer, spacer and bolt (pivot pin).

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Steering - Cylinders

Steering cylinder - Overhaul

GNIL14TR04546FB

1

1.

Seeger (5 and 7 also)

5. Ball joint

2.

Assembled rod

6. Head

3.

Piston

7. Nut

4.

Lock nut

8. Seal kit

1. Fix the body taking care not to scratch it.

2. Push the rod to the end of the stroke (in the welded

side).

3. Use the seeger clamp to remove the head seeger.

4. Use the head bell and the plastic hammer to push the

head inside the body 20.00 - 30.00 mm (0.79 - 1.18 in).

GNIL14TR04548AA

2

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Steering - Cylinders

5. Remove the internal retaining ring with screw driver.

6. Remove the head hammering the rod. Remove the

piston after unscrew the self locking nut.

NOTE: Check that oil ports are not plugged and remove

internal oil.

GNIL14TR04547AA

3

7. Extract the rod by pulling. Seal on the piston could

require energetic action. Clamp the rod paying special

attention to not scratch its surface.

8. Remove with the screw driver piston seal and O-ring

under the seal.

GNIL14TR04549AA

4

9. Throw away used seal and open the seal kit and clean

the piston.

GNIL14TR04550AA

5

10. Apply piston seal mounting bell against piston and in-

sert the O-ring having it slipping on the bell.

GNIL14TR04551AB

6

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Steering - Cylinders

Installation of lip seal

CAUTION

Pinch hazard!

Always use suitable tools to align mating parts.

DO NOT use your hand or fingers.

Failure to comply could result in minor or mod-

erate injury.

C0044A

1. Lubricate the lip seal with hydraulic oil and place it on

the assembly tool.

GNIL14TR04552AA

7

2. Insert the external ring of the piston seal over the O-ring

just mounted in this way. Position the ring over the bell,

take the pushing tool and overpass with it in the piston.

The seal will fit its groove automatically.

GNIL14TR04553AA

8

3. Calibrate the seal with the appropriate tool.

NOTICE: Use the screwdriver with care avoiding scratches

on seal grooves.

GNIL14TR04554AA

9

4. Remove seals on the head with the screw driver.

GNIL14TR04555AA

10

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Steering - Cylinders

5. Wash the head and verify whether the rags have been

generated during disassembling and working

GNIL14TR04556AA

11

6. Manual mount rod seal, taking care about the orienta-

tion of the lips. (Oriented to retain oil).

GNIL14TR04557AA

12

7. Mount manually the wiper (taking care about lip orien-

tation) and the static seal (external).

GNIL14TR04558AA

13

8. Draw the inner and outer parts of the assembly tool

out of the steering unit bore, leaving the guide from the

inner part in the bore.

9. Lubricate the lip seal with hydraulic oil and place it on

the assembly tool.

GNIL14TR04559AA

14

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Steering - Cylinders

Installation of lip seal

CAUTION

Pinch hazard!

Always use suitable tools to align mating parts.

DO NOT use your hand or fingers.

Failure to comply could result in minor or mod-

erate injury.

C0044A

1. Insert the head and piston on rod-screw self locking

nut at torque (Nm). Grease every seal on body, head

and piston. Grease the internal wall of body ( 20.00 -

30.00 mm (0.79 - 1.18 in)) entrance zone.

GNIL14TR04560AA

15

2. Insert the assembled rod. Taking care to not damage

piston seal. Hammer the rod to end of stroke. Unscrew

the rod bell and screw on the other side.

GNIL14TR04561AA

16

3. Insert the head manually up to 20.00 - 30.00 mm (0.79

- 1.18 in) inside.

GNIL14TR04562AA

17

41.4 [41.216] / 8

Wheels - Front wheels

Front wheels - Test - 2WD

Wheel camber test

When the tractor moves along a straight line, wheels

should be tilted by 2 ° relative to the ground. Check

the front wheel camber that corresponds to a difference

(X) of approximately 15.0 mm (0.6 in) between the rim

edges.

GNIL14TR04457AB

1

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Wheels - Front wheels

Front wheels - Toe in adjust - 2WD

Front wheel toe-in test

When the tractor moves along a straight line, wheels

should be parallel to the tractor centre line or slightly

toe-in until a max. of 0.50 mm (0.02 in), measured be-

tween the rim edges.

Check the correct toe-in as follows:

1.

Inflate front tires to a pressure of 1.7 bar (25.0 psi).

2.

Place the steering wheel at mid-travel, with one spoke

along the tractor centre line.

3.

Check if wheels are parallel to the tractor centre line.

4.

Measure the distance (B) between the wheel inner rims

at hub height at the front of the wheels.

5.

Measure the distance between the wheel inner rims at

hub height at the rear of the wheels. The measurement

taken should be the same as (B) or greater by up to

5.00 mm (0.20 in) max.

GNIL14TR04458AB

1

6.

If it is necessary to adjust the front wheel toe-in, pro-

ceed as follows:

• Loosen the clamp (1) on both end of the track control

rod.

• Turn the track control rod (2) in or out to shorten or

lengthen the track control rod until desired toe-in is

achieved.

• Tighten the clamp (1).

GNIL14TR04459AB

2

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