 |
Escaping fluid under pressure, even a pinhole size leak, can penetrate body tissue, causing serious injury, and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury. Always use a board or cardboard when checking for a leak. |
 |
|
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. |
|
|
Sudden movement of the machine or release of oil under pressure can cause serious injury to persons on or near the machine. To prevent possible injury, perform the procedure that follows before testing and adjusting the hydraulic system. |
|
Note: This procedure must be performed with the machine on jack stands so that the tires can rotate.
Before you conduct the test, refer to the following steps:
- Stop the engine.
- Place the propel control lever in NEUTRAL position.
- Apply the parking brake.
| 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. |
| Required Tools | ||
| Part Number | Description | Quantity |
| 6V-7788 | Flow Meter | 1 |
| 4C-4892 | ORFS Fittings Group | 1 |
| 9X-2350 | Hose (36 inches) | 2 |
| 4C-6500 | Digital Thermometer | 1 |
 | |
| Illustration 1 | g00674234 |
(1) Case Drain Lines | |
- Install the 4C-6500 Digital Thermometer into the hydraulic oil tank. The hydraulic oil temperature must be 38°C (100 °F) for proper test results.
- Disconnect case drain line (1) from the wheel motor. Install a short hose and the 6V-7788 Flow Meter to the wheel motor. Connect the case drain line (1) to the outlet of the flow meter. This allows the leakage oil to flow from the drum drive motor through the flow meter and into case drain line.
- Start the engine. Run the engine at 3005±15 rpm (high idle rpm).
| NOTICE |
|---|
To prevent overheating of the hydraulic oil and damage to the propulsion system components, do not run each test longer than 30 seconds. |
- With the propel control lever in NEUTRAL position, read the amount of oil that is flowing through the flow meter. The oil flow should be less than 3.8 L/min (1 US gpm). If the flow is greater than this specification, the motor needs to be repaired or replaced.
- Release the parking brake.
- Slowly move the propel control lever in the FORWARD position. Read the amount of oil that is flowing through the flow meter. The maximum allowable oil flow is 3 L/min (0.8 US gpm). If the flow is greater than this specification, the motor needs to be repaired or replaced.
- Stop the engine and remove the tooling. Reconnect case drain lines (1) to the drive motor for the wheels.