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

©

200424

5-5

Disassembly and assembly

HYDRAULIC LIFTING GEAR

ΧΦ65/75/85 series

8

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".

HYDRAULIC LIFTING GEAR

5-6

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200424

Disassembly and assembly

9

ΧΦ65/75/85 series

8

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

©

200424

5-7

Disassembly and assembly

HYDRAULIC LIFTING GEAR

ΧΦ65/75/85 series

8

9

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

HYDRAULIC LIFTING GEAR

5-8

©

200424

Disassembly and assembly

9

ΧΦ65/75/85 series

8

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