TM 5-2420-231-23-1
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LOADER RELIEF VALVE CONTINUED
Pressure Check - Continued
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2. Connect 5,000 psi (34,478 kPa) pressure gauge (Figure 47, Item 2) to hose (Figure 47, Item 1).
3. Operate loader or backhoe until engine and transmission are at normal operating temperature
(TM 5-2420-231-10).
4. Run engine at 2000 rpm. Hold manual control lever in raise (dead head) position until loader stops moving.
5. Hold manual control lever in raise (dead head) position and read pressure gauge (Figure 47, Item 2).
6. Release manual control lever and decrease engine speed to low idle. Stop engine.
7. Reading should be 2,900 to 3,200 psi (20,000 to 22,063 kPa).
8. If loader relief valve pressure is very low, perform Steering Control Valve Test in this work package. If steering
relief valve pressure on flowmeter checksheet (7c) is also low, perform Flowmeter Connection and Flow
Regulator Pressure Test in this work package before making an adjustment.
9. If loader relief valve pressure is very low, and steering relief pressure is normal, perform the following before
making an adjustment:
a. Start and run engine at 2,000 rpm.
b. Curl the backhoe bucket and hold (dead head) in that position.
c.
Read pressure gauge (Figure 47, Item 2).
d. If pressure goes up, a loader check valve is faulty. Replace manual control valve assembly (WP 0261).
e. If pressure does not go up and reading is not within specification, perform Loader Relief Valve Adjustment
in this work package.
10. Decrease engine speed to idle and turn machine off (TM 5-2420-231-10).
Figure 47. 5000 PSI Pressure Gauge.
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END OF TASK
