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 6. Test Pilot Control Flow.
Backhoe Auxiliary Hydraulic
Control Does Not Operate
Perform pilot control valve test (WP
Pilot Control Flow Greater Than 1
Correctly - Continued
gpm - Perform Flowmeter Disconnect
Procedure (WP 0086).
Replace backhoe control valve
assembly (WP 0263).
Proceed to Test Step 14.
Pilot Control Flow Less Than 1 gpm
- Perform Flowmeter Disconnect
Procedure (WP 0086).
Replace pilot control valve assembly
(WP 0264).
Proceed to Test Step 14.
Test Step 7. Test Pilot Control Wiring
Harness for a Short to Ground.
1. Ensure ignition switch is in the off
position (TM 5-2420-231-10) and
disconnect batteries (WP 0157).
2. Disconnect pilot control wiring har-
ness connector (WP 0007, Figure
160) from pilot control controller
(WP 0187).
3. Remove left tower boot (WP
0287).
4. Disconnect pilot control wiring har-
ness connector (WP 0007, Figure
219) from LH tower wiring harness
connector (WP 0007, Figure 220).
5. Using a digital multimeter, test for
Continuity - Replace pilot controls
continuity between pilot control
wiring harness (WP 0187).
wiring harness connector (WP
Proceed to Test Step 14.
0007, Figure 219) terminal 5 and
No Continuity - Proceed tostep 6.
terminal 3. There should be no
continuity.
6. Using a digital multimeter, test for
Continuity - Replace pilot controls
continuity between pilot control
wiring harness (WP 0187).
wiring harness connector (WP
Proceed to Test Step 14.
0007, Figure 219) terminal 5 and
No Continuity - Proceed to step 7.
terminal 4. There should be no
continuity.
7. Using a digital multimeter, test for
Continuity - Replace pilot controls
continuity between pilot control
wiring harness (WP 0187).
wiring harness connector (WP
Proceed to Test Step 14.
0007, Figure 219) terminal 5 and
No Continuity - Proceed to step 8.
machine ground. There should be
no continuity.
0081-9