315B Excavator Excavator Systems Caterpillar

Boom Cylinder - Assemble

Usage:

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Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A		⁽¹⁾ Hydraulic Cylinder Repair Stand	1
	3S-6224	Electric Hydraulic Pump	1
	8T-0820	Pressure Gauge	1
	3B-7722	Bushing	2
	1P-2376	Coupler Assembly	2
	1P-2377	Plug	2
	8F-0024	Hose Assembly	2
B	4C-4471	85 mm Socket	1
C	1P-0520	Driver Group	1

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If the Wolff Hydraulic Cylinder Repair Stand is not available to assemble the boom cylinder, contact the Caterpillar Service Technology Group.

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NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in Caterpillar machines. Dispose of all fluids according to local regulations and mandates.

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Check the condition of all of the parts of the boom cylinder for wear or damage. If any of the parts are worn or damaged, use new parts for replacement.

Note: Make sure that the grooves for the seals in head (8) are thoroughly clean prior to assembly.

Install ring (14) , bearing (16) , seal (18) , seal (19) , and ring (20) in head (8) .

Apply 4C-4032 Bearing Mount Compound to the groove for the wiper seal prior to assembly. Use Tooling (C) to install lip type seal (21) in head (8) . Install the seal with the sealing lip toward the outside of the cylinder assembly.

Put clean hydraulic oil on the lip of lip type seal (21) , ring (20) , seal (19) , and seal (18) .

Place head (8) in position on cylinder assembly (1) . Install eight bolts (7) that hold head (8) to cylinder assembly (1) . Install rod assembly (9) in head (8) and cylinder assembly (1) .

Remove eight bolts (7) that hold head (8) to cylinder assembly (1) . Remove cylinder assembly (1) from the rod assembly and the head.

Note: The slit of ring (13) must be positioned in the direction of the piston.

Install ring (13) on the rod assembly. The slit in ring (13) must face piston (6) . Install stop (12) on rod assembly (9) .

Install piston (6) on the rod assembly. Lubricate the threads on the end of the rod assembly with 4C-5593 Anti-Seize Compound . Install locknut (6) . Use Tooling (B) to tighten locknut (2) to a torque of 4500 ± 230 N·m (3320 ± 170 lb ft) .

Install ring (5) , seal assembly (4) and ring (3) on piston (6) . Lubricate the outside of the piston with 1P-0808 Multipurpose Grease .

Use Tooling (A) to install cylinder assembly (1) on rod assembly (9) . Install eight bolts (7) that hold head (8) to cylinder assembly (1) . Fully extend the rod assembly. Tighten eight bolts (7) that hold head (8) to cylinder assembly (1) .

Lower the temperature of sleeve bearing (23) . Use Tooling (C) to install the bearing in the pin bore of rod assembly (9) . Install the bearing until the bearing is centered in the bore. Use Tooling (C) to install lip type seals (22) in the pin bore on both sides of rod assembly (9) . Install the lip type seals with the sealing lips toward the outside of the bore. Install the lip type seals until the lip type seals are 1.00 ± 0.50 mm (.039 ± .020 inch) below the outside surface of rod assembly (9) .

Lower the temperature of sleeve bearing (11) . Use Tooling (C) to install the bearing in the pin bore of cylinder assembly (1) . Install the bearing until the bearing is centered in the bore. Use Tooling (C) to install lip type seals (10) in the pin bore on both sides of cylinder assembly (1) . Install the lip type seals with the sealing lips toward the outside of the bore. Install the lip type seals until the lip type seals are 1.00 ± 0.50 mm (.039 ± .020 inch) below the outside surface of cylinder assembly (1) .