| Required Tools | |||
|---|---|---|---|
| Tool | Part Number | Part Description | Qty |
| A | 4C-4892 | ORFS Fittings Group | 1 |
| 8T-0859 | Pressure Gauge 25000 kPa (3620 psi) |
1 | |
 |
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 implement 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. |
 |
| 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 Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates. |
- Adjust the hydraulic pressure that is supplied to the rotate circuit. Refer to the Service Manual for the host machine for the proper procedure. Adjust the pressure to approximately 20000 kPa (2900 psi).
- Install tooling (A) to test fitting (1) .
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| Illustration 1 | g00729358 |
Typical Example (R) Rotate the rotator to the right. (L) Rotate the rotator to the left. | |
- Start the engine of the host machine. Operate the host machine until the hydraulic oil reaches normal operating temperature.
- In order to prevent rotation, rotate the work tool to a horizontal position. Place the work tool on the ground. Apply enough pressure to the work tool in order to prevent the work tool from rotating.
- Attempt to rotate the work tool to the left. Record the reading on the pressure gauge.
- Lower the work tool to the ground and stop the engine of the host machine. Relieve the pressure from the hydraulic system. Refer to Service Manual for the host machine for the proper procedure.
- Remove Tooling (A) from test fitting (1) .
- Install tooling (A) to test fitting (2) .
- Start the engine of the host machine.
- In order to prevent rotation, rotate the work tool to a horizontal position. Place the work tool on the ground. Apply enough pressure to the work tool in order to prevent the work tool from rotating.
- Attempt to rotate the work tool to the right. Record the reading on the pressure gauge.
- Lower the work tool to the ground and stop the engine of the host machine. Relieve the pressure from the hydraulic system and remove the tooling.
- The pressure at each test fitting should be 14000 ± 1000 kPa (2031 ± 145 psi). If the pressures were within the specification, the control valves are working properly. If the pressures were not within the specification, a control valve(s) is not working properly. You will need to proceed to the next step.
- Disconnect hose assembly (3) and hose assembly (4) from control valve (5). Plug the hoses and install an additional hose assembly onto the fittings on the control valve. The hose assembly must be installed in order to allow the rotation of the motor and the work tool.
Note: If an additional hose is not available, hose (4) may be used. Disconnect hose (4) from swivel tee (7) and remove the hose from the clips. Install a cap onto swivel tee (7) .
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| Illustration 2 | g00735095 |
Typical Example (3) hose assembly (4) hose assembly (5) control valve (6) control valve (7) swivel tee | |
Note: In order to determine the valve that is faulty, you must isolate the control valves.
- Repeat Step 3 through Step 12. If the pressures were not within the specification, replace control valve (6). If the pressures were within the specification, replace control valve (5) .