385B and 5090B Excavators Excavator Systems Caterpillar

Bucket Cylinder - Assemble

Usage:

385B ANS

Assembly Procedure

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Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A	125-0079	Hydraulic Cylinder Repair Stand	1
A	152-4249	Hydraulic Cylinder Repair Stand ⁽¹⁾	1
B	4C-8092	Universal Wrench	1
C	1P-0520	Bearing and Seal Driver	1
Secondary Tools ⁽²⁾
	3S-6224	Electric Hydraulic Pump	1
	8T-0820	Pressure Gauge	1
	3B-7722	Bushing	2
	1P-2377	Plug	2
	8F-0024	Hose Assembly	2
	4C-4465	Adapter	1
	1P-0851	Spline	1
	4C-4482	150 mm Socket	1

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⁽¹⁾	CE Compliant
⁽²⁾	The secondary tools are used with the Wolff Hydraulic Cylinder Repair Stand. If a hydraulic repair stand is not available to disassemble the cylinder, consult 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 product. 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 Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates.

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Illustration 1	g00599418

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

Lower the temperature of the bearing for the cylinder assembly. Use Tooling (C) to install the bearing into the pin bore of the cylinder assembly. Install the bearing until the bearing is centered in the bore. Use Tooling (C) to install two lip seals (2) in the pin bore of the cylinder assembly until the seals contact the bearing. Install the seals so that the sealing lips are facing out.
Lower the temperature of the bearing for the rod assembly. Use Tooling (C) to install the bearing into the pin bore of the rod assembly. Install the bearing until the bearing is centered in the bore. Use Tooling (C) to install two lip seals (7) in the pin bore of the rod assembly until the seals contact the bearing. Install the seals so that the sealing lips are facing out.
Install bearing (12) and ring (11) in head (5).
Note: Make sure that the grooves for the seals in head (5) are thoroughly clean prior to assembly.
Install seal (13), seal (14), and ring (15) in head (5).
Apply 4C-4032 Bearing Mount Compound to the groove for the wiper seal prior to assembly. Use Tooling (C) to install seal (16) in head (5). Install seal (16) with the sealing lip toward the outside of cylinder assembly (1).
Install O-ring seal (9) and ring (10) in head (5).
Apply clean hydraulic oil on the lip of seal (16), ring (15), seal (14) and seal (13).
Position head (5) on cylinder assembly (1). Install bolts (6).
Fasten a suitable lifting device to cylinder assembly (1). Temporarily install cylinder assembly (1) and head (5) onto the rod assembly. Remove bolts (6). Remove cylinder assembly (1) from the rod assembly and the head.
Install seal assembly (18), two rings (17), and ring (19) on piston (4). Lubricate the outside of piston (4) with 5P-0960 Molybdenum Grease.
Install piston (4) on rod assembly (8). Lubricate the threads on the end of rod assembly (8) with 5P-0960 Molybdenum Grease.
Install locknut (3). Use Tooling (B) to tighten locknut (3) to a torque of 13500 ± 700 N·m (9957 ± 516 lb ft) for the W-Family bucket.
Fasten a suitable lifting device to cylinder assembly (1). Slide cylinder assembly (1) over rod assembly (8) until cylinder assembly (1) meets head (5).
Install bolts (6) that secure head (5) to the cylinder assembly. Tighten bolts (6).