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| Illustration 1 | g02356496 |
| SPECIFICATIONS FOR 349-6042 Bulldozer Lift Cylinder Gp and 349-6040 Bulldozer Lift Cylinder Gp | |||
| Callout | Part Number | Part Name | Specification Description |
| 1 | 1F-6762 | Bolt | Torque the bolts to |
| 2 | 1U-4074 | Piston Insert | The inserts must not extend beyond the face of the piston. |
| 3 | 9T-3885 | Piston | Diameter of a new piston is |
| 4 | 349-6043 | Cylinder As | Bore of a new cylinder is |
| 349-6041 | Cylinder As | ||
| 5 | 227-0992 | Rod As | Diameter of a new rod assembly is |
| 233-0481 | Rod As | ||
| 6 | 172-9981 | Head | Apply clean grease to the threads on the head.
Torque the head to |
| 7 | 289-2937 | Buffer Seal As | Lubricate the seal with lubricant that is being sealed. |
| 8 | 289-2948 | U-Cup Seal | Lubricate the seal with lubricant that is being sealed. |
| 9 | 225-3281 | Wiper Seal | Apply Loctite Retaining Compund 620 to wiper seal groove prior to assembly.
Lubricate the seal with lubricant that is being sealed. |
| A | - | - | Depth of the spacers below the face of the piston is Dimension (A). Dimension (A) is |
| Required Tools | |||
|---|---|---|---|
| Tool | Part Number | Part Description | Qty |
| A | 138-7573 | Link Bracket | 2 |
Start By:
- Release the hydraulic system pressure.
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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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Personal injury can result from hydraulic oil pressure and hot oil. Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system. Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand. |
| 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. |
Note: Mark all components for correct installation. When you disconnect the hoses, cap the connections to keep the system clean.
- Attach Tooling (A) and a suitable lifting device on lift cylinder (1). The weight of lift cylinder (1) is approximately
200 kg (440 lb) .Show/hide table
Illustration 3 g01224709 - Remove bolt (4), retainer (6), and pin (2).
Note: Position of spacers (3) and (5) (not shown)
Show/hide table
Illustration 4 g01201712 - Disconnect hose assemblies (7) from quick-drop valve (8).
Show/hide table
Illustration 5 g01201714 - Remove bolts (9) and caps (10). Remove lift cylinder (6) from the machine.
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| Illustration 2 | g01224707 |
- Install lift cylinder (6) in the reverse order of removal.
- Tighten bolts (9) to a torque of
430 ± 60 N·m (315 ± 45 lb ft) . - Connect hose assemblies (7) to quick-drop valve (8). Tighten the bolts that fasten the half flanges to a torque of
50 ± 10 N·m (37 ± 7 lb ft) .
- Tighten bolts (9) to a torque of
- After lift cylinder (6) is installed.
- Check the hydraulic oil tank level. Refer to Operation and Maintenance Manual, "Hydraulic System Oil Level - Check" for the correct procedure.
- Cycle the cylinder three times, getting as close to the end of stroke without going to full stroke.
- Cycle the cylinder another time going to full stroke slowly. Do not hold in stall.
- After cycling the cylinder, check the hydraulic oil level again.
Disassembly and Assembly Information
| Required Tools | |||
| Tool | Part Number | Part Description | Qty |
| B | 1P-0808 | Multipurpose Grease | 1 |
| C | 1P-0510 | Driver Gp | 1 |
| D | 195-4609 | Seal Pick | 1 |
| E | 7M-7456 | Bearing Mount Compound | 1 |
| F | 127-4904 | Hydraulic Cylinder Repair Stand Gp | 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 6 | g01204615 |
(1) Torque for bolt ...
(2) Torque for head ...
(3) Lubricate sealing lips with a thin covering of the lubricant that is being sealed.
Note: Apply Tooling (B) to threads.
(4) Apply Tooling (E) to the groove in the wiper prior to assembly.