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
6. Using a digital multimeter, test for
Continuity - Replace pilot controls
Backhoe Auxiliary Hydraulic
continuity between pilot control
wiring harness (WP 0187).
Control Does Not Operate
wiring harness connector (WP
Proceed to Test Step 14.
Correctly - Continued
0007, Figure 219) terminals 1 and
No Continuity - Connect pilot control
6. There should be no continuity.
wiring harness connector (WP 0007,
Figure 219) to LH tower wiring harness
connector (WP 0007, Figure 220).
Install left tower boot (WP 0287).
Replace backhoe pilot control controller
(WP 0191).
Proceed to Test Step 14.
Test Step 10. Test Pilot Control
Wiring Harness to Backhoe Auxiliary
Forward Control Solenoid for a Short
to Ground.
1. Turn ignition switch to the off posi-
tion (TM 5-2420-231-10) and dis-
connect batteries (WP 0157).
2. Disconnect pilot control wiring har-
ness connector (WP 0007, Figure
160) from pilot control controller.
3. Using a digital multimeter, mea-
Resistance 4.0 - 7.0 Ohms - Proceed
sure resistance between pilot con-
to Test Step 12.
trol wiring harness connector (WP
Resistance Less Than 4.0 Ohms -
0007, Figure 160) terminals 2 and
Proceed to step 4.
15. Resistance should be 4.0 - 7.0
Resistance Greater Than 7.0 Ohms -
ohms.
Proceed to Test Step 11.
4. Disconnect pilot control wiring har-
ness connector (WP 0007, Figure
223) from backhoe forward auxil-
iary control solenoid (WP 0007,
Figure 224).
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 223) terminals 1 and
No Continuity - Proceed to step 6.
2. 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 223) terminals 2 and
No Continuity - Connect pilot control
machine ground. There should be
wiring harness connector (WP 0007,
no continuity.
Figure 219) to LH tower wiring harness
connector (WP 0007, Figure 220).
Install left tower boot (WP 0287).
Replace pilot control valve (WP 0264).
Proceed to Test Step 14.
0081-12