DAF CF65, CF75, CF85 Series . Manual - part 1070

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 200424

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Disassembly and assembly

HYDRAULIC LIFTING GEAR

ΧΦ65/75/85 series

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9

6.

Fit the spring (6) on the pin of the magnet-

core (4).

7.

Oil the valve (7) and slide the valve into the 

holder (8). Check for freedom of movement.

8.

Install the holder (8) with the adjusting ring(s) 

(3) on the valve casing.

9.

Install the valve in the pump unit, see the 

chapter "Removal and installation".

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Disassembly and assembly

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ΧΦ65/75/85 series

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5.3 DISASSEMBLY AND ASSEMBLY, CYLINDER

Disassembling the cylinder
1.

Remove the cylinder from the vehicle, see 

the chapter "Removal and installation".

2.

Check whether all the oil has been drained 

from the cylinder.

3.

Clean the cylinder before disassembly. Work 

in very clean conditions. Make sure that the 

piston rod is not damaged during the repair 

or maintenance activities.

4.

Remove the circlips (1) and push the 

bearing (2) from the eye.

5.

Remove the circlip (4).

6.

Remove the dirt which has collected before 

the O-ring (5) and remove the O-ring (5).

7.

Use a plastic mallet to carefully tap the 

piston-rod guide (10) deeper into the 

cylinder, until the spring clip (6) can be 

removed. Make sure that the piston rod is not 

damaged in the process.

8.

Remove the spring clip (6) from the cylinder.

9.

Pull the entire length of the piston rod (11) 

out of the cylinder. The piston-rod guide (10) 

will come out of the cylinder together with the 

piston rod.

10. Remove the plastic rings (14) and (16) from 

the piston.

11. Remove the nut (1) and use a plastic mallet 

to tap the piston (13) from the piston rod.

12. Slide the piston-rod guide (10), the O-ring (5) 

and the circlip (4) from the piston rod. Pay 

attention to the position of the circlip.

1 2

1

2

11 12

13 14 15 16 17 18

3 4 5 6

8 9

A

B

10

7

A8 00 248

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Disassembly and assembly

HYDRAULIC LIFTING GEAR

ΧΦ65/75/85 series

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13. Remove the dirt scraper (3), the sealing 

ring (7), the O-ring (9) and the plastic ring (8) 

from the piston-rod guide.

14. Remove the sealing ring (15) and the 

underlying O-ring (16) from the piston.

Assembling the cylinder
1.

Check the sealing-ring chambers and 

recesses, the dirt scraper and O-rings for 

impurities.

Check the surfaces of the piston rod and the 

cylinder casing for signs of wear and/or 

damage. Even the slightest damage can 

cause a leak.

Check the condition of the spring clip (6) and 

the circlip (4). Replace if necessary.

Replace the sealing rings, dirt scraper and 

O-rings. 

Apply a layer of grease to the O-rings and 

running surfaces of the sealing rings and dirt 

scraper prior to assembly.

2.

Install the O-ring (16) on the piston (13).

3.

Heat the new sealing ring (15) for 5 minutes 

in water at a temperature of 90

C.

4.

Position the special tool (DAF no. 1310472), 

see "b" in the illustration, on the piston (13).

5.

Slide the heated sealing ring (15) onto the 

piston using the special tool 

(DAF no. 1310473), see "a" in the 

illustration.

6.

Slide the special tool (DAF no. 1310474), 

see "c" in the illustration, over sealing ring 

(15) and leave the special tool on the sealing 

ring for 5 minutes.

13

15

16

b

a

A8 00 260

13

15

16

c

A8 00 261

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Disassembly and assembly

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ΧΦ65/75/85 series

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7.

Install the sealing ring (7) with the recess 

aimed towards the piston (13) into the piston-

rod guide (10). To do so, press the sealing 

ring together as shown in the illustration. 

Make sure that no sharp corners are formed.

Subsequently, press the sealing ring into the 

chamber of the piston-rod guide as shown in 

the illustration.

8.

Install the dirt scraper (3) into the piston-rod 

guide (10).

You should proceed in the same manner as 

when installing the sealing ring (7).

9.

Install the plastic ring (8) onto the piston-rod 

guide (10).

You should proceed in the same manner as 

when installing the sealing ring (15) on the 

piston.

10. Install the O-ring (9) on the piston-rod guide 

(10). The O-ring should fall into the groove at 

the piston side. The plastic ring (8) is 

positioned on the circlip side.

11. Slide the circlip (4) into the correct clamping 

position over the piston rod.

12. Slide the O-ring (5) over the piston rod.

13. Oil the piston rod (11) and slide the piston-

rod guide (10) onto the piston rod.

14. Install the piston (13) on the piston rod, 

replace the self-locking nut (18) and tighten 

the nut to the prescribed tightening torque, 

see "Technical data".

15. Apply some oil to the cylinder casing.

16. Install the plastic rings (14) and (17) on the 

piston. The gap openings of the rings should 

be opposite each other. During the 

installation of the piston in the cylinder, the 

gap openings may not be positioned near 

line connection A of the cylinder.

17. Apply some oil to the plastic rings (14) and 

(17) and the sealing ring (15) and slide the 

piston into the cylinder. When sliding the 

piston into the cylinder, the plastic rings 

should be pressed into the grooves.

18. Slide the piston-rod guide (10) into the 

cylinder and tap the piston-rod guide 

carefully into the cylinder using a plastic 

mallet until the spring clip (6) can be fitted. 

Make sure that the piston rod is not damaged 

in the process.

A8 00 262

A8 00 263

1

2

13 14 15 16 17 18

B

A8 00 286