Relief Valve (Charge) - Test and Adjust
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| Required Tools | |||
| Tool | Part Number | Description | Quantity |
| A | 8T-0854 | Pressure Gauge | 1 |
| B | 8T-0855 | Pressure Gauge | 1 |
- Attach the 8T-0854 Pressure Gauge to the right case drain test port (3). Attach the 8T-0855 Pressure Gauge to the right charge relief valve test port (5) .
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| Illustration 1 | g00735651 |
(1) Left propel pump (2) Right propel pump (3) Right case drain test port (4) Right charge relief valve adjustment screw (5) Right charge relief valve test port | |
- Activate the parking brake.
- Start the engine and run the engine at high idle.
- Observe the pressure gauge reading for the case drain test port (3). Observe the pressure gauge reading for the charge relief valve test port (5).
Note: The pressure gauge reading for the charge relief valve includes the case drain pressure. Use the following steps in order to obtain the pressure for the charge relief valve.
- Subtract the pressure gauge reading for the case drain test port from the pressure gauge reading for the charge relief valve test port. The result should be 2550 ± 140 kPa (370 ± 20 psi).
Note: Record the pressure reading in order to use the value in the Testing and Adjusting, "Relief Valve (Main) - Test and Adjust".
- Place the engine in low idle and stop the engine.
- If the pressure reading was not correct, the charge relief valve needs adjustment. Loosen the locknut on the adjustment screw (4). As needed, turn the adjustment screw clockwise or counterclockwise.
Note: One turn of the adjustment screw in either direction will change the charge pressure by approximately 345 kPa (50 psi).
- Tighten the locknut on the adjustment screw for the charge relief valve.
- After an adjustment has been made, repeat 3 through 8 in order to recheck the charge pressure.
- When the correct pressure is obtained, stop the engine. Remove the pressure gauge from the test ports (3) and (5) .
- Repeat 3 through 9 for the left charge relief valve.
- When the correct pressure is obtained, stop the engine. Remove the pressure gauges from the test ports on the left charge relief valve.
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