988K XE Wheel Loader Machine Systems Caterpillar

Lift Cylinder - Remove and Install

Usage:

Removal Procedure

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Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A	284-5122	Stands	2
	8S-7641	Tube	2
	8S-7615	Pin	2
B	9U-6751	Receiving Sleeve As	1
	9U-6809	Nut	1
	316-1489	Cylinder	1
	350-7768	Electric Hydraulic Pump Gp (115v)	1
	350-7769	Electric Hydraulic Pump Gp (230v)
	9U-6811	Puller Stud	1
C	237-9180	Receiving Sleeve As	1
	4C-6504	Puller Rod	1
	9U-6800	Nut	1
	346-5029	Cylinder	1
	350-7769	Electric Hydraulic Pump Gp (230v)	1
	350-7769	Electric Hydraulic Pump Gp (115v)
D	-	Loctite 271	-
E	452-6006	Grease Cartridge	-

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When you are using hydraulic cylinders and puller studs, always ensure that the rated capacity of the puller stud meets or exceeds the rated capacity of the hydraulic cylinder. If the puller stud does not meet or exceed the rated capacity of the hydraulic cylinder, a sudden failure of the puller stud could occur. The sudden failure of the puller stud could result in personal injury or death.

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Illustration 1	g03420954

Note: Bucket has been removed for photo purposes.

Position Tooling (A) under lift arms (1).
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Illustration 2 g03421324
Disconnect hose assemblies (2).
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Illustration 3 g03421363
Attach a suitable lifting device to lift cylinder (3). The weight of cylinder (3) is approximately 726 kg (1600 lb).
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Illustration 4 g03421378
Remove bolt (4).
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Illustration 5 g03421381

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Illustration 6 g03421430
Attach a suitable lifting device to Tooling (B). The weight of Tooling (B) is approximately 136 kg (300 lb). Install Tooling (B) onto pin assembly (5). The weights of Tooling (B) and pin assembly (5) are approximately 181 kg (400 lb). Remove Tooling (B) and pin assembly (5). Lower lift cylinder (3) on to suitable cribbing.
Reposition suitable lifting device on lift cylinder (3). The weight of lift cylinder (3) is approximately 726 kg (1600 lb).
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Illustration 7 g03421517
Attach a suitable lifting device to Tooling (C). The weight of Tooling (C) is approximately 136 kg (300 lb). Install Tooling (C) onto pin assembly (6). The weights of Tooling (C) and pin assembly (6) are approximately 181 kg (400 lb). Remove Tooling (C) and pin assembly (6). Remove the lift cylinder.

Disassembly and Assembly

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Table 2
Required Tools
Tooling	Part Number	Part Description	Qty
F	127-4904	Hydraulic Cylinder Repair Stand Gp	1
G	195-4609	Seal Pick	1
H	-	Loctite® 638	1
J	485-0088	Seal Guide	1

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Illustration 8	g03828388

Lubricate seals (4), (5), and (6) with a minimal amount of the fluid that is being sealed.

(2) Torque for the nut ... 13500 ± 1350 N·m (9960 ± 995 lb ft)

Note: Lubricate the threads of the cylinder rod before nut (2) is installed.

(3) Torque for the bolts ... 900 ± 100 N·m (664 ± 74 lb ft)

Apply Tooling (H) to the seal groove prior to assembling the wiper seal.

Tooling (J) is used when you are installing seals (4), (5), and (6).

Assemble the piston seal with the step cut oriented 180° from the head ports.

Installation Procedure

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Illustration 9	g03485498

Note: Use Illustration (8) as a guide for the pins and the pin joints that are being referenced in the procedure.

Install lift cylinder (3) in the reverse order of removal.
1. Check and replace lip seals if necessary. If replacing the lip seal, apply Tooling (D) to the bore.
2. Lubricate the diameter of Y-pin (6) with Tooling (D). Use Tooling (C) to install pin (6). Add Tooling (E) through grease hardware until lubricant extrudes from the seal.
3. Lubricate the diameter of K-pin (5) with Tooling (D). Use Tooling (B) to install pin (5). Add Tooling (E) through grease hardware until lubricant extrudes from the seal.