DAF CF65, CF75, CF85 Series . Manual - part 1068

©

 200424

4-5

Removal and installation

HYDRAULIC LIFTING GEAR

ΧΦ65/75/85 series

8

9

4.4 REMOVAL AND INSTALLATION, PRESSURE RELIEF VALVE

Removing the pressure relief valve
1.

Make sure that the trailing axle wheels are 

fully lowered and on the ground.

2.

Clean the valve and the surrounding area.

Work cleanly.

3.

Remove the fuse from the lifting gear.

4.

Remove the entire valve (3) from the valve 

block.

5.

The valve (3) itself cannot be disassembled.

If necessary, turn out the hexagonal socket 

screw until the ball is lifted from its seat. 

Subsequently purge the valve using 

compressed air. Before unscrewing the Allen 

screw, first measure the length of the Allen 

screw protruding from the valve. After 

purging the valve, screw the Allen screw into 

the valve to the same length.

Installing the pressure relief valve
1.

Renew the O-rings(1) and (2). Apply a little 

oil to the valve (3) and install it into the valve 

block.

Tighten the valve to the specified torque. 

See "Technical data".

2.

Install the fuse.

3.

Check the pressure and adjust if necessary. 

See "Inspection and adjustment".

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2

3

A8 00 276

HYDRAULIC LIFTING GEAR

4-6

©

 200424

Removal and installation

9

ΧΦ65/75/85 series

8

4.5 REMOVAL AND INSTALLATION, CYLINDER

Removing the cylinder
1.

Make sure that the trailing axle wheels are 

fully lowered and on the ground.

2.

Clean the line connections and the 

surrounding area.

3.

Remove the fuse from the lifting gear.

4.

Remove the shock absorber next to the 

cylinder.

If the cylinder is located on the vehicle's left, 

the linkage of the load-dependent brake-

control valve should also be removed.

5.

Remove the lines from the lifting cylinder.

Note: the line attached to line connection A of 

the pump unit may retain a residual 

pressure.

Wait for approx. 5 minutes after the trailing 

axle has been lowered before disconnecting 

the lines.

Collect the oil coming from the line. 

Plug the openings.

6.

Disconnect the lines of the central greasing 

system, if applicable.

7.

Remove the pin (4) that connects the 

cylinder (3) with the lever (5).

8.

Remove the two bushes from the lever (5). 

The cylinder will now point downwards, 

causing part of the oil in the cylinder to flow 

out.

9.

Remove the attachment nut (2) and remove 

the cylinder (3) from the chassis support (1).

Collect the oil still present in the cylinder.

   

   

B

A

A8 00 281

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5

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4

A8 00 283

©

 200424

4-7

Removal and installation

HYDRAULIC LIFTING GEAR

ΧΦ65/75/85 series

8

9

Installing the cylinder
1.

Clean the pivot points of the cylinder 

connection.

2.

Grease the chassis support pin. Fit the 

cylinder on the pin. Hand-tighten the nut onto 

the pin.

3.

Check the bushes (3) and grease them. Fit 

the bushes (3) to the lever (4).

4.

Apply some grease to the connecting pin (6) 

and install it in the bushes (3) with the nut 

side pointing towards the chassis members.

5.

Fit the lock washer (2) with the nut (1) to the 

pin (6). Tighten the nut (1) to the specified 

torque. See "Technical data".

6.

Tighten the chassis support nut.

7.

Connect the hydraulic lines.

8.

Install the shock absorber and, if applicable, 

the linkage of the load-dependent brake-

control valve.

9.

Reconnect the lines of the central lubricating 

system, if applicable.

10. Manually lubricate the turning points, or do 

so using the central greasing system.

11. Install the fuse.

12. Activate the lifting gear several times. Check 

the oil level in the reservoir and top up, if 

necessary.

Inspect the line connections for leaks.

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6

2 3

3

4

4

5

A8 00 284

HYDRAULIC LIFTING GEAR

4-8

©

 200424

Removal and installation

9

ΧΦ65/75/85 series

8