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| Illustration 1 | g03536697 |
| Specification for 425-2910 Boom Cylinder Gp | |||
| Item | Qty | Part | Specification Description |
| All bores must be free of paint. Use lubricant in order to coat all bores for the pins. | |||
| 1 | - | Bushing | Bore, after assembly is |
| 2 | 2 | 3B-8489 Grease Fitting | Torque to |
| 3 | 2 | Connector | Torque to |
| 4 | 2 | 6V-6317 Bolt | Torque to |
| 5 | 1 | 438-2618 Head | Before assembly, lubricate the threads with clean oil.
Torque to |
| 6 | 1 | 438-2636 Piston | Torque to |
| 7 | 1 | Setscrew | Torque to |
| 8 | - | - | Before assembly, apply green Loctitie 648 to wiper seal groove. |
| 9 | - | - | Lubricate sealing lip lightly with the lubricant being sealed. |
| B | 1 | 438-2617 Rod As | Diameter is |
| C | 1 | 438-2619 Cylinder As | Bore is |
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At operating temperature, the hydraulic oil is hot and under pressure. Hot oils can cause burns. To prevent possible personal injury, release the pressure in the work tool hydraulic circuit (boom, stick, bucket, and swing), travel circuits, and the hydraulic oil tank at the filler cap before any hydraulic lines or components are disconnected or removed. Remove the filler cap only when the engine is stopped and the filler cap is cool enough to touch. |
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Cylinders equipped with lock valves can remain pressurized for very long periods of time, even with the hoses removed. Failure to relieve pressure before removing a lock valve or disassembling a cylinder can result in personal injury or death. Ensure all pressure is relieved before removing a lock valve or disassembling a cylinder. |
| NOTICE |
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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, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products. Dispose of all fluids according to local regulations and mandates. |
- Attach a suitable lifting device to boom cylinder (4). The weight of boom cylinder (4) is approximately
112 kg (246 lb) . - Remove retaining bolt (1) and washer (2). Remove pin assembly (3) and the shims.
- Lower boom cylinder (4) to a horizontal position.
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Illustration 3 g03749509 - Attach a suitable lifting device to boom cylinder (4). Disconnect hose assembly (8).
- Remove retaining bolt (6) and washer (5). Remove pin assembly (7) and the shims.
- Remove boom cylinder (4).
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Illustration 4 g03750396 - Remove clamps (9) and (11). Remove tube assemblies (10).
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| Illustration 2 | g03749507 |
Disassembly and Assembly Procedure
| Required Tooling | |||
| Item | Part Number | Part Description | Qty |
| A | - | Loctite 648 | 1 |
| C | 1P-1833 | Adapter | 1 |
| 9U-6833 | Nut | 1 | |
| 4C-9633 | Puller Stud | 1 | |
| 6V-3160 | Double Acting Cylinder | 1 | |
| 3S-6224 | Electric Hydraulic Pump Gp | 1 | |
| FT-1410 | Sleeve | 1 | |
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Cylinders equipped with lock valves can remain pressurized for very long periods of time, even with the hoses removed. Failure to relieve pressure before removing a lock valve or disassembling a cylinder can result in personal injury or death. Ensure all pressure is relieved before removing a lock valve or disassembling a cylinder. |
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| Illustration 5 | g03536697 |
(1) Use Tooling (C) to install bushings. Bore is
(2) Torque to
(3) Torque connector to
(4) Torque to
(5) Before assembly, lubricate the threads with clean oil. Tighten the head to
(6) Tighten piston to
(7) Tighten setscrews to
(8) Before assembly, Tooling (A) to the wiper seal groove.
(9) Lubricate sealing lip lightly with the lubricant being sealed.
| Required Tools | |||
| Tool | Part Number | Part Description | Qty |
| B | 5P-0960 | Grease Cartridge | 1 |
- Install tube assemblies (10).
- Install clamps (9) and (11). Tighten the bolts to a torque of
31.5 ± 5.9 N·m (278.8 ± 52.2 lb in) .Show/hide table
Illustration 7 g03749509 - Attach a suitable lifting device to both ends of boom cylinder (4). Raise boom cylinder (4) to a horizontal position and position boom cylinder (4) onto the chassis. The weight of boom cylinder (4) is approximately
112 kg (246 lb) . - Apply Tooling (B) to pin assembly (7). Install pin (7). Install washer (5) and retaining bolt (6).
- Connect hose assembly (8).
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Illustration 8 g03749507 - Raise boom cylinder (4) and extend the rod in order to position the cylinder onto the boom.
- Apply Tooling (B) to pin assembly (3). Install pin assembly (3) and the shims. Install washer (2) and retaining bolt (1).
- Remove all suitable lifting devices.
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| Illustration 6 | g03750396 |