TM 5-2420-231-23-1
0074
Table 1. Backhoe Swing Does Not Operate Correctly - Continued.
074
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Backhoe Swing Does Not
Test Step 4. Check Pilot Control
Operate Correctly -
Pressure.
Continued
While operating backhoe swing left and
Pilot Control Pressure 350 to 550 psi
right (TM 5-2420-231-10), check pilot
- Disconnect hose and pressure gauge
control pressure. Perform pilot pressure
from machine.
test (WP 0086).
Proceed to Test Step 5.
Pilot Control Pressure Less Than 350
psi - Disconnect hose and pressure
gauge from machine.
Replace pilot control valve assembly
(WP 0264).
Proceed to Test Step 6.
Test Step 5. Check Joystick Control
Flow.
Perform pilot control valve test (WP
Any Pilot Control Flow Greater Than
1 gpm - Perform Flowmeter Disconnect
Procedure (WP 0086).
Replace backhoe control valve
assembly (WP 0263).
Proceed to Test Step 6.
Any Pilot Control Flow Less Than 1
gpm - Perform Flowmeter Disconnect
Procedure (WP 0086).
Replace right-side joystick control valve
(WP 0266).
Proceed to Test Step 6.
Test Step 6. Verify That Symptom Is
Resolved.
1. Turn on engine (TM 5-2420-231-
10).
2. Operate backhoe swing (TM 5-
Backhoe Swing Cylinders Operate
2420-231-10) and observe opera-
Normally - Troubleshooting complete.
tion.
Backhoe Swing Cylinders Operate
Slowly or Erratically - Repeat
troubleshooting from the beginning.
Backhoe Swing Will Not Operate -
Repeat troubleshooting from the
beginning.
END OF WORK PACKAGE
0074-5/(6 blank)