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New Holland Tractor Workmaster 50 / Workmaster 60 / Workmaster 70 / Tier 4B (final). SERVICE MANUAL - page 11

Hydraulic systems - Main lift system

17. Remove link (1).

GNIL14TR04636AB

15

18. Unscrew locking screw (1) and remove position con-

trol cam (2) and bracket (3).

GNIL14TR04637AB

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19. Remove dowel pin (1).

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20. Remove cam (1).

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Hydraulic systems - Main lift system

21. Remove lock (1) and disassemble link (2).

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22. Unscrew locking screw (1) and disassemble lever (2)

along with link (3).

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Lift arm shaft - removal

23. Remove lift assembly from the tractor and fix it on a

rotary stand. Refer to Main lift system - Remove

(35.100).

GNIL14TR04642AA

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24. Remove the circlip (1) from lift arm shaft.

GNIL14TR04643AB

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35.2 [35.100] / 19

Hydraulic systems - Main lift system

25. Remove the lift arm from the shaft.

NOTE: Before removing lift arm punch a mark (1) on both

lift arm and shaft to facilitate the assembly in original posi-

tion.

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26. Repeat the same for the other side lift arm.

GNIL14TR04645AB

24

27. Remove the locking sensor (1) locking crank and

shaft.

28. Push the shaft from left-hand side towards right-hand

side by hammering gently using aluminium or copper

rod.

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Hydraulic systems - Main lift system

Main lift system - Assemble

Draft sensing unit

Assemble and reinstall sensing unit on hydraulic hous-

ing observing the following:

1. Assembly and reinstallation follows the removal proce-

dure is reverse from step 7 to step 1.

2. Tighten all fasteners to correct torque. See Main lift

system - Torque (35.100).

3. The top face of spring roller:

• Should be 1.000 mm (0.039 in) above the top face

of flange.

• In case, if it is less add shims and if more remove

shims.

GNIL14TR04622AA

1

4. Refer to page for correct settings.

Rear lift internal controls

5. Re-assembling follows disassembly procedure in re-

verse.

Lift arm shaft

6. Reinstall the shaft and lift arm in the lift housing observ-

ing the following:

• Reinstallation follows the removal procedure in re-

verse. Refer to Main lift system - Disassemble

(35.100) from step 6 to step 1.

• See Main lift system - Install (35.100) for reinstal-

lation of lift assembly on tractor.

• Check the seals (1) and replace if required.

• Use special tool number 9970873 to fix the seal.

• Tighten all fasteners to correct torque as detailed in

Main lift system - Torque (35.100).

GNIL14TR04647AB

2

35.2 [35.100] / 21

Hydraulic systems - Main lift system

GNIL14TR04652FB

1

B. Draft control lever setting

With reference to 2.

The adjustment of the draft control lever must be carried

out to have a correct synchronisation between this lever

and the stroke (positive and negative) of the top link

bracket in order to make full use of the reaction spring.

The adjustment must be carried out without implements

or loads applied to the three point linkage (20) (i.e. in a

neutral position).

Position the two control levers (1) and (2) in the lowest

position.

With the motor running at minimum RPM slowly raise

the draft control lever (2).

The adjustment of the draft lever (2) is correct when it

is moved upward to the (6-8) sign on the sector and this

allows the arms to be completely raised.

If the lever (2) raises completely the arms before arriv-

ing at the (6-8) sign on the sector then the measurement

(L) of the rod (T) must be shortened.

If the lever (2) raises completely the arms after passing

the (6-8) sign on the sector then the measurement (L)

of the rod (T) must be lengthened.

NOTE: The position of the lever (1) establishes only the

position of the arms but does not influence the adjustment

of the draft control lever (2).

35.2 [35.100] / 23

Hydraulic systems - Main lift system

GNIL14TR04653FB

2

C. Reaction spring setting

With reference to figure 3.

For a correct functioning of the rockshaft the top link

bracket, when it is not working, must not have an axial

play in the positive (+) and negative (-).

After having carried out a correct assembly, the spring

holder (2) must rest against the rockshaft housing (1),

while the spring holder cover (4) must rest against the

flange (3).

In this condition the spring (M) is set to a preload of 0.30

- 0.60 mm (0.01 - 0.02 in).

Before assembling the complete reaction assembly to

the rockshaft housing a pre-assembly of the spring (M)

is needed in order to obtain a measurement of about

8.40 mm (0.33 in).

After carrying out the reaction assembly a definitive ad-

justment is made:

Keep the screw (V) fixed with an 8.00 mm (0.31 in)

wrench and adjust the self-locking nut (D) by tightening

or loosening it gradually in order to eliminate the axial

play completely.

35.2 [35.100] / 24

Hydraulic systems - Main lift system

GNIL14TR04654FB

3

D. Internal push rod setting

With reference to figure 4.

If the rockshaft is disassembled and if the regulator (R)

must be changed it is advisable to control the measure-

ment “X” (~10,5) in order to re-assemble the push rod

in the same position.

Ensure also that the measurement of the spring is 46.00

- 46.30 mm (1.81 - 1.82 in).

The control of the measurement of the push rod with re-

spect to the control valve face is carried out after making

all the adjustments (sensitivity of control valve - position

control lever - draft control lever).

With the rock shaft’s arms completely lowered and with-

out loads or implements on the three point linkage (neu-

tral position), position the two control levers (1) and (2)

at their lower position against the backstop (F).

In this position push the push rod and verify with

the appropriate gauge that the distance of 112.00 -

112.50 mm (4.41 - 4.43 in) is correct.

NOTE: If the measurement “X” is changed it is obligatory

to carry out again the adjustment of the position and draft

control levers.

35.2 [35.100] / 25

Hydraulic systems - Main lift system

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Hydraulic systems - Main lift system

Main lift system - Inspect

GNIL14TR04650FB

1

The pre selector (P) is used to connect the auxiliary

port-thread M18 x 1.5 and send the oil to a single acting

cylinder-for example a wagon dump-and moving it with

the draft lever (2).

In this way the oil that normally is filling the rock-shaft

cylinder is deviated to the external cylinder.

• Connect the port (PA) to the single acting usage e.g.

Wagon dump cylinder.

• For safety fully lower the lift arms by putting down

both draft and position levers.

• Screw completely the pre selector (P) in order to

block the oil passage to the rock shaft cylinder.

• To obtain the acting of external cylinder move up

slowly the draft lever (2). If the top link bracket is

in neutral position (without any implement attached)

the effect starts when the lever (2) is between num-

bers 9-6 on the sector.

• To obtain the stop of the acting move back down a

little the draft lever.

• To obtain the discharge - cylinder closing - lower

down fully the draft lever (2).

NOTE: In the acting phase-external cylinder opening-if the

single acting arrives to the end of the stroke the relief valve

enters in action with the possibility to damage the pump if

the system is left for a long time in this position.

35.2 [35.100] / 27

Hydraulic systems - Main lift system

Main lift system - Troubleshooting

Problem

Possible Cause

Correction

The Rockshaft lifts jerkily

Insufficient oil level in the tank

Top up the level

Pump inlet filter clogged

Clean or replace the filter

Infiltration of air into the pump inlet pipe

Check the inlet pipe and any coupling and

gasket

Rockshaft does not

Differential valve blocked or dirty

Remove the control valve and unblock the

operate

regulator piston

The rock shaft starts to

Tension rod measurement (L) is not cor-

Adjust the draft control lever (Refer to Main

lift, but it stops as soon as

rect (Refer to Main lift system - Adjust

lift system - Adjust (35.100))

it feels the load, without

(35.100))

the functioning of the

over-pressure valve

The rock shaft does not

Faulty adjustment of the position control

Adjust position control lever (Refer to Main

descend over its entire

lever (1)

lift system - Adjust (35.100))

travel

The rock shaft does not

Discharge valve blocked

Remove control valve and unblock or clean

descend

discharge valve

Lever RD closed

Turn lever RD in anti-clockwise

Lifting capacity does not

Deterioration of the control valve seal rings

Remove control valve and replace the ex-

match that prescribed

ternal seal rings

Relief and safety valves out or calibration

Control calibration of the valves

Poor pump efficiency

Replace the pump

Excessive loss of oil from control valve

Overhaul the control valve

The rock shaft supports

Piston gasket worn

Replace the gasket

loads with difficulty

When the motor is off

Oil leakage from safety valve

Remove control valve and adjust valve

Oil leakage from check valve

Remove the control valve and adjust valve

With the arms raised at

Incorrectly adjusted of position control lever

Adjust the position control lever (Refer to

backstop and with the

which, at maximum raised height, causes

Main lift system - Adjust (35.100))

engine on, we have

the internal automatic backstop to function

verified a rhythmic

oscillation, with the

engine off the load does

not lower

The draft control does not

Draft control lever is adjusted badly

Adjust the draft control lever ( Main lift sys-

function, the rock shaft

tem - Adjust (35.100)).

raises and lowers only

with the position lever

The position control does

Position control lever is adjusted badly

Adjust the position control lever (Refer to

not function, the rock

Main lift system - Adjust (35.100))

shaft raises and lowers

only with the draft lever

Rockshaft does not lift

Pre selector i s fully closed

Unscrew fully the pre-selector (P) (Refer to

and the relief valve acts

Main lift system - Adjust (35.100)).

with the possibility to

damage the pump

35.2 [35.100] / 29

Hydraulic systems - Fixed displacement pump

Fixed displacement pump - General specification

FILTER

Type

Full-flow spin on type

Location

On suction pipe before pump intake, on the right-hand

side of the engine

PUMP

Type

Gear type (In tandem with the steering pump), drawing

oil from transmission housing

Location

On the right-hand side of the engine

Mounting

Fitted on engine timing case and driven by timing gears

Make

Rexroth (Bosch Group)

Drive

Engine timing gears

Rotation (seen from the free end of the drive shaft)

Anti-clockwise

Displacement

16 cm³ per revolution

Max. rotational speed

3300 RPM

Flow at 1500 RPM & 210 bar

21.12 L/min

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Hydraulic systems - Fixed displacement pump

Fixed displacement pump - Remove

1. Disconnect the power steering pipes on the hydraulic

hump.

GNIL14TR00729AA

1

2. Disconnect the hydraulic delivery pipe on the pump and

remove the connector (1).

GNIL14TR00730AA

2

3. Remove the hydraulic filter and connector between hy-

draulic filter and pump.

GNIL14TR00731AA

3

4. Remove the power steering suction pipe.

GNIL14TR00732AA

4

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Hydraulic systems - Fixed displacement pump

5. Loosen the allen screws and remove the hydraulic

pump.

GNIL14TR00733AA

5

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Hydraulic systems - Remote control valves

Remote control valve - Remove

WARNING

Escaping fluid!

Lower the three-point hitch to the ground and relieve all pressure from the hydraulic system before

installing the kit.

Failure to comply could result in death or serious injury.

W1114A

1. Loosen the set screw and remove the remote control

valve lever.

2. Remove the two circlip (1) and (2) from position control

lever. Remove the position control lever (3).

GNIL14TR00646AA

1

3. Loosen the two bolts (1) and remove the quadrant (2).

GNIL14TR00647AA

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4. Loosen the bolts (1) and remove the draft control lever

(2).

GNIL14TR00648AA

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Hydraulic systems - Remote control valves

5.

1. Remove the hydraulic pipes (1) on remote control

valve.

2. Loosen the bolts (2) and remove the plate.

3. Remove the remote control valve.

GNIL14TR00649AA

4

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Hydraulic systems - Remote control valves

Remote control valve - Remove

WARNING

Escaping fluid!

Lower the three-point hitch to the ground and relieve all pressure from the hydraulic system before

installing the kit.

Failure to comply could result in death or serious injury.

W1114A

1.

1. Loosen the set screw (1). Remove the remote con-

trol valve lever (2).

2. Similarly remove the another remote control valve

lever.

GNIL14TR00659AA

1

2. Remove the two circlip (1) and (2) from position control

lever. Remove the position control lever (3).

GNIL14TR00646AA

2

3. Loosen the two bolts (1) and remove the quadrant (2).

GNIL14TR00647AA

3

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Hydraulic systems - Remote control valves

4. Loosen the bolts (1) and remove the draft control lever

(2).

GNIL14TR00648AA

4

5. Loosen the bolt (1).

GNIL14TR00658AA

5

6. Loosen the bolts (1). Remove the hoses (2).

GNIL14TR00657AA

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7.

1. Loosen the bolts (1).

2. Remove the plate (2).

3. Remove the two remote control valves (3).

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Hydraulic systems - Remote control valves

Remote control valve - Install

WARNING

Escaping fluid!

Lower the three-point hitch to the ground and relieve all pressure from the hydraulic system before

installing the kit.

Failure to comply could result in death or serious injury.

W1114A

NOTE: For installation, follow the removal process in reverse order.

Lubricate the seal rings (1) lightly with petroleum jelly.

This will help to hold rings in position during installation.

GNIL14TR00650AA

1

35.4 [35.204] / 7

Hydraulic systems - Remote control valves

Mid-mount remote control valve - Remove

1. Disconnect the two joystick cable from the mid-mount

valve. See Joystick and Electric Hydraulic (EH) con-

trol - Remove (55.512).

2. Disconnect the hydraulic delivery pipe between hy-

draulic pump and mid-mount valve.

GNIL14TR00783AA

1

3. Disconnect the hydraulic delivery pipe between mid-

mount valve and main control valve.

GNIL14TR00843AA

2

4. Disconnect the hydraulic line between the mid-mount

valve and hydraulic lift body.

GNIL14TR00842AA

3

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Hydraulic systems - Remote control valves

5. Loosen the bolts (1) and remove the mid-mount valve

from the mounting bracket.

GNIL14TR00844AA

4

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Hydraulic systems - Remote control valves

Mid-mount remote control valve - Install

1. Install the mid-mount valve on the mounting bracket

and tighten the bolts (1).

GNIL14TR00844AA

1

2. Connect the hydraulic line between the mid-mount

valve and hydraulic lift body.

GNIL14TR00842AA

2

3. Connect the hydraulic delivery pipe between

mid-mount valve and main control valve.

GNIL14TR00843AA

3

4. Connect the hydraulic delivery pipe between hydraulic

pump and mid-mount valve.

GNIL14TR00783AA

4

5. Connect the joystick cables. See Joystick and Elec-

tric Hydraulic (EH) control - Install (55.512).

35.4 [35.204] / 10

Hydraulic systems - Reservoir, cooler, and filters

Oil filters - Remove

1. Loosen the clamp and remove the suction pipe from

the hydraulic filter.

GNIL14TR00725AA

1

2. Loosen the allen screws (1) and remove the hydraulic

filter.

GNIL14TR00728AA

2

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