- Work Tool:
- FORK (LOGGING) (S/N: 7RW145-UP)
Introduction
This special instruction provides the information in order to assist upgrading the 222-2178 Hydraulic Cylinder Gp with the installation of the 344-1135 Rod As . The cylinder that has been reworked will become the 344-1147 Hydraulic Cylinder Gp .
Before performing the rework that is outlined in this Special Instruction, ensure that you understand the information that is contained in the Special Instruction.
Reference
ReferenceSpecial Instruction, REHS2677, "Hydraulic Cylinder Repair Process"
ReferenceBench Test Procedures, REHS1765, "Testing Hydraulic Cylinders Using the 188-3926 AVSpare Cylinder Tester "
ReferenceGuideline For Reusable Parts and Salvage Operations, SEBF8072, "Inspection and Salvage of Hydraulic Cylinder Components"
Necessary Parts
| 344-1135 Rod As | |||
|---|---|---|---|
| Item | Qty | Part Number | Description |
| (1) | 1 | 344-1136 | Rod As |
| (2) | 1 | 344-1138 | Head |
| (3) | 1 | 356-1192 | Seal Kit |
| (4) | 1 | 344-1137 | Piston |
| (5) | 1 | 356-1189 | Cushion |
| (6) | 1 | 356-1190 | Retainer |
| (7) | 1 | 224-6811 | Bushing |
| (8) | 1 | 2L-0043 | Retaining Ring |
| (9) | 1 | 3B-8489 | Grease Fitting |
Removal Procedure
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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 work tools have been lowered to the ground, and the 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. |
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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, "AVSpare Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on AVSpare products. Dispose of all fluids according to local regulations and mandates. |
- Lower the logging fork to the ground. Close the clamps on the fork.
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| Illustration 1 | g02144181 |
(1) Clamp of the logging fork | |
- Turn off the host machine.
- Relieve the system pressure and disconnect the hydraulic lines.
- Remove the cylinder from the fork.
Disassembly and Assembly Procedure
Note: Make sure that your work area is clean before tearing down the hydraulic cylinder. Avoid introducing contamination to the internal working parts of the cylinder.
- Place the cylinder in a vise or another type of a clamping device. Place the hydraulic cylinder in a vertical position.
- Extend the rod completely and drain the oil into a suitable container.
- Remove the 12 screws that are holding the retaining ring.
- Pull the rod assembly out of the cylinder.
- Inspect the tube and clean the tube if contamination is present.
- The new 344-1135 Rod As contains seals on a piston and a gland. Apply hydraulic oil to the seals on the piston, the gland, and the mouth of the tube assembly.
- Before installing the new rod assembly, make sure that the moisture excluder is in place. if the cylinder is built vertically, install the moisture excluder (O-ring) into the counterbore of the tube assembly. Refer to Figure 2.
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| Illustration 2 | g02143222 |
(2) Moisture excluder | |
- Install the new 344-1135 Rod As into the tube.
Note: The 222-2178 Hydraulic Cylinder Gp becomes the new 344-1147 Hydraulic Cylinder Gp . Refer to Table 2.
Show/hide tableTable 2 QTY Pt. No. Part Name Former Pt. No. 2 344-1147 Hydraulic Cylinder Gp 222-2178
Note: Use caution not to damage the seals.
- Apply 9S-3263 Thread Lock Compound to the tapped holes in the flange.
- Tighten the screw to 217 to 244 N·m (160 to 180 lb ft) in an alternating star pattern (12 places).
- Strike through the old part number or remove the old part number on the 222-2178 Hydraulic Cylinder Gp . Etch the new part number on the cylinder.
Note: If the dealer or the customer has a parts manual for the fork, the parts manual should be updated with the new cylinder part number.
- Plug the ports on the cylinder in order to prevent contamination until the cylinder is installed on the machine.
- When the cylinder is installed on the log fork, cycle the cylinder several times to purge the air.