8012-10

Cre 7-27902GB Issued 05-05

Bucket cylinder description

JS00658A

36

35

34

31 32 33

38

37 3029

44

43

5

4

6

14

15

411

42

41

42

41

78

913

1211

56

40

23

2221 20 24 16 17

45

1819

8012-11

Cre 7-27902GB Issued 05-05

1 LUBRICATION FITTING2 NOT USED3 NOT USED4 SCREW5 HYDRAULIC PIPE6 O-RING7 SCREW8 WASHER9 RETAINING CLIP

10 NOT USED11 SCREW12 WASHER13 RETAINING CLIP14 SCREW15 BEARING16 SCREW17 STEEL BALL18 PISTON NUT19 PISTON20 SEAL RING21 BACK UP RING22 WEARING RING23 WEARING RING24 SHIM25 NOT USED26 NOT USED27 NOT USED28 NOT USED29 O-RING30 BACK UP RING31 WEARING RING32 BACK UP RING33 SQUARE SEAL34 U-RING35 BACK UP RING36 WIPER SEAL37 STOPPING RING38 BUSHING39 NOT USED40 CUSHION BUSHING41 WIPER SEAL42 BUSHING43 CYLINDER ROD44 CYLINDER BARREL45 O-RING

8012-12

Cre 7-27902GB Issued 05-05

DisassemblyNOTE: The boom, dipper and bucket cylinders arebasically identical in construction. What changes isthe hydraulic tube connections. Before installing thecylinder in the repair stand, remove the hydraulictubes.

STEP 1

Boom cylinderNOTE: The numbers in brackets in the following stepsrefer to the boom cylinder schematic on page 6.

1. Remove the lubrication fitting (1) from thecylinder.

2. Remove the two plugs (2). Remove and discardthe two O-rings (3).

3. Remove the screws (4) and disconnect thehydraulic tubes (5) and (10) from the cylinder.Remove and discard the two O-rings (6).

4. Remove the screw (7), the washer (8) and theclamp (9) from the tubes. Remove the hydraulictubes (5) and (10) from the cylinder.

5. Remove the screws (11), the washers (12) andthe clamp (13) from the cylinder.

STEP 2

Dipper cylinderNOTE: The numbers in brackets in the following stepsrefer to the dipper cylinder schematic on page 8.

1. Remove the lubrication fitting (1) from thecylinder.

2. Remove the plug (2) from the hydraulic tube.Remove and discard the O-ring (3).

3. Remove the screws (4) and disconnect thehydraulic tube (5) and the clamp from the cylinder.Remove and discard the two O-rings (6).

4. Remove the screw (7), the washer (8) and theclamp (9) from the cylinder.

5. Remove the screws (11), the washers (12).Remove the clamp (13) from the cylinder.Remove the hydraulic tube (5) from the cylinder.

STEP 3

Bucket cylinderNOTE: The numbers in brackets in the following stepsrefer to the bucket cylinder schematic on page 10.

1. Remove the two lubrication fittings (1) from thecylinder.

2. Remove the screws (4). Disconnect the hydraulictubes (5) from the cylinder. Remove and discardthe two O-rings (6).

3. Remove the screw (7), the washer (8) and theclamp (9) from the cylinder.

4. Remove the screws (11), the washers (12) andthe clamp (13) from the cylinder. Remove thehydraulic tube (5) from the cylinder.

NOTE: As an example, the repairing benchCAS 10918 is used.

STEP 4

JD00620A

Install suitable bushings on the cylinder head stockchuck wings.

STEP 5

JD00621A

Tighten the bushing retaining screws.

8012-13

Cre 7-27902GB Issued 05-05

STEP 6

JD00623A

Install the stop pins on the boom tail stock.

STEP 7

JD00624A

Install suitable bushings on the cylinder tail stockchuck wings. Tighten the retaining screws. Install thechuck wings on the cylinder tail chuck. Tighten thelocking screws. Use the scale on the face of thechuck to aid in centering the chuck wings.

STEP 8

JD00625A

Connect lifting equipment, if necessary, to thecylinder. Position the cylinder in the repair stand withthe rod end of the cylinder at the head stock chuck.Loosen the retaining screws of the tail stock chuckwings. When positioning the cylinder rod end on thehead stock chuck wing, be sure that the chuck wingbushings are centred in the rod bushing. Install thescrew and nuts to secure the cylinder rod end to therepair stand.

STEP 9

JD00626A

On the cylinder repair stand, loosen the retainingscrews of the tail stock chuck wings. Whenpositioning the cylinder barrel end on the head stockchuck wing, be sure that the bushings are centred inthe cylinder barrel bushing. Install the screw and nutsto secure the cylinder barrel end to the repair stand.