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.
0081
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.
