Gerotor Motor Leakage - Test
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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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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, PERJ1017, "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. |
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| Required Tools | |||
|---|---|---|---|
| Tool | Part Number | Part Description | Qty |
| A | 4C-4892 | ORFS Fittings Group | 1 |
| 8T-0859 | Pressure Gauge
(1) |
1 | |
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| (1) | Part of 4C-4892 ORFS Fittings Group |
- Inspect the rotate circuit for external leakage. If a leak is found, perform the necessary repairs. If there is no sign of leakage, proceed to the next step.
- Check each control valve for the proper operating pressure. Refer to Service Manual, "Control Valve Pressure (Hydraulic Rotator) - Test". The control valve must be operating at the proper pressure in order for this test to be valid.
- Adjust the pressure of the host machine for the rotate circuit to
12000 ± 500 kPa (1740 ± 70 psi) . Refer to Service Manual for the host machine for the adjustment procedure.Show/hide table
Illustration 1 g03410766 For MP332
(CW) Rotate circuit clockwise and (CCW) Rotate circuit counterclockwise
(1) Port - supply/return
(2) Port for pressure testingShow/hide table
Illustration 2 g06319744 For MP345 and MP365
(CW) Rotate circuit clockwise and (CCW) Rotate circuit counterclockwise
(1) Port - supply/return
(2) Port for pressure testingShow/hide table
Illustration 3 g06326420 (1) Port - supply/return
(2) Port for pressure testing - Remove hose assembly from the work tool at return port (1). Plug the hose from the machine. Cap the coupling on the work tool preventing oil from returning to the hydraulic tank.
- Install Tooling (A) on port (2) for the return side of the circuit.
- Start the engine of the host machine and operate the machine until the hydraulic oil reaches normal operating temperature.
- Open the jaws of the work tool. In order to prevent rotation, rotate the work tool to a horizontal position. Place the work tool on the ground. Place downward pressure on the work tool in order to prevent the work tool from rotating.
- Attempt to rotate the work tool in a counterclockwise direction. Record the reading on the pressure gauge.
- If the pressure on the pressure gauge increases, the gerotor motor must be repaired. Refer to Service Manual, "Gerotor Motor - Disassemble".
- The air must be purged from the work tool before the tool is returned to operation. Refer to Service Manual, "Hydraulic System Air - Purge" for the proper procedure.
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