DAF CF65, CF75, CF85 Series . Manual - part 971

©

 200423

2-1

Inspection and adjustment

STEERING PUMP

ΧΦ65/75/85 series

7

4

2. INSPECTION AND ADJUSTMENT

2.1 INSPECTION, FLOW CONTROL VALVE LUK VT72A, VT77 AND LF77

Note:

If there is sufficient space behind the steering 

pump, this inspection can be carried out while the 

steering pump is still attached to the engine.

1.

Clean the steering pump and the 

surrounding area.

2.

Place a receptacle underneath the steering 

pump.

3.

Remove the plug (5) at the back of the 

steering pump (1).

4.

Remove the flow control valve (2) with the 

spring (3) from the steering pump (1).

Mark the position of the valve in the valve 

bore.

5.

Check both the valve and the valve bore for 

impurities. Clean these parts if necessary.

6.

Apply plenty of clean steering oil to the valve 

and fit the valve in the correct position 

(hexagon facing outwards) in the bore.

7.

Check the valve for smooth operation. The 

valve should not jam.

8.

Fit the spring (3) to the valve (2).

9.

Fit the plug (5), equipped with a new sealing 

ring (4), to the pump. Tighten the plug to the 

specified tightening torque, see 'Technical 

data'.

10. Fill and bleed the steering gear hydraulic 

system.

11. Take a test drive and check the plug for 

leaks.

1

2

3

4

5

S7 00 052

STEERING PUMP

2-2

©

 200423

Inspection and adjustment

4

ΧΦ65/75/85 series

7

2.2 INSPECTION, FLOW CONTROL VALVE ZF 7685

Note:

If there is sufficient space behind the steering 

pump, this inspection can be carried out while the 

steering pump is still attached to the engine.

1.

Clean the steering pump and the 

surrounding area.

2.

Place a receptacle underneath the steering 

pump.

3.

Remove the plug (1) at the back of the 

steering pump.

4.

Remove the flow control valve (4) with the 

spring (3) from the steering pump.

Mark the position of the valve in the valve 

bore.

5.

Check both the valve (4) and the valve bore 

for impurities. Clean these parts if 

necessary.

6.

Apply plenty of clean steering oil to the valve 

(4) and fit the valve in the correct position in 

the bore.

7.

Check the valve for smooth operation. The 

valve should not jam.

8.

Fit the spring (3) to the valve (4).

9.

Fit the plug (1), equipped with a new O-ring 

(2), to the pump. Tighten the plug (1) to the 

specified torque. See 'Technical data'.

10. Fill and bleed the steering gear hydraulic 

system.

11. Take a test drive and check the plug for 

leaks.

1 2

3

4

S7 00 600

©

 200423

3-1

Removal and installation

STEERING PUMP

ΧΦ65/75/85 series

7

4

3. REMOVAL AND INSTALLATION

3.1 REMOVAL AND INSTALLATION, STEERING PUMP LUK VT77 AND LF77

Removing steering pump LUK VT77 and LF77

Note:

When replacing a worn steering pump, you are 

advised to drain the steering oil fully, dismantle 

the steering oil reservoir and clean it thoroughly, 

and to replace the filter.

In extreme situations, the steering pump may 

have been worn to such an extent that metal 

pump parts have entered the steering box. Check 

the steering box for internal wear using the test 

case.

1.

Clean the line connections.

2.

Remove the wiring harness attachments that 

are behind the pump.

3.

Place a receptacle underneath the steering 

pump.

4.

Remove the lines from the steering pump 

and plug the line and pump openings.

The steering oil filter is fitted in the return line, 

which means that should any dirt enter, it will 

immediately also enter the steering gear.

5.

Remove the attachment bolts and remove 

the steering pump from the engine timing 

gear.

Installation of steering pump LUK VT77 and 
LF77
1.

Transfer the drive sprocket to the steering 

pump to be fitted, if necessary.

Thoroughly remove any preserving grease, 

especially from the tapered parts.

Apply locking compound to the attachment 

nut and tighten them to the specified torque. 

See 'Technical data'.

2.

If necessary, connect the line couplings to 

the steering pump to be fitted. Tighten the 

couplings to the specified torques, see 

'Technical data'.

If the specified tightening torques 

are exceeded, the aluminium pump 

housing may be damaged.

3.

Fit a new O-ring to the steering pump and 

grease it lightly.

S7 00 567

}

STEERING PUMP

3-2

©

 200423

Removal and installation

4

ΧΦ65/75/85 series

7

4.

Fit the pump to the engine. Tighten the 

attachment bolts evenly to the specified 

tightening torque, see 'Technical data'.

5.

Fit the lines.

6.

Fill and bleed the steering gear hydraulic 

system.

7.

Re-connect the wiring harness as it was 

originally connected.

8.

Take a test drive and check the line 

connections for leaks.