TM 5-2420-231-23-1
0081
Table 1. Backhoe Auxiliary Hydraulic Control Does Not Operate Correctly - Continued.
081
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Test Step 4. Inspect Backhoe
Backhoe Auxiliary Hydraulic
Auxiliary Hydraulic Hoses at
Control Does Not Operate
Backhoe Swing Chassis.
Correctly - Continued
Inspect backhoe auxiliary hydraulic
Backhoe Auxiliary Hydraulic Hoses
hoses at backhoe swing chassis for
OK - Proceed to Test Step 5.
damage and Class III leaks between
Backhoe Auxiliary Hydraulic Hoses
tubes and valve bank.
Damaged or Leaking - Replace
backhoe auxiliary hydraulic hose (WP
0244).
Proceed to Test Step 14.
Figure 7. Backhoe Auxiliary Hoses at Backhoe Swing Chassis.
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Test Step 5. Test Pilot Pressure.
While activating backhoe auxiliary
Pilot Pressure 350 to 550 psi -
Remove hose and pressure gauge from
hydraulic switches (TM 5-2420-231-
machine.
10), test pilot pressure (WP 0086).
Replace backhoe control valve
assembly (WP 0263).
Proceed to Test Step 14.
Pilot Pressure Less Than 350 psi -
Remove hose and pressure gauge from
machine.
Replace pilot control valve assembly
(WP 0264).
Proceed to Test Step 14.