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
5. Using a digital multimeter, mea-
Backhoe Auxiliary Hydraulic
Resistance 5.0 Ohms or Less -
sure resistance between pilot con-
Proceed to step 6.
Control Does Not Operate
trol wiring harness connector (WP
Correctly - Continued
Resistance Greater Than 5.0 Ohms -
0007, Figure 219) terminals 3 and
Replace pilot controls wiring harness
machine ground. Resistance
(WP 0187).
should be 5.0 ohms or less.
Proceed to Test Step 14.
6. Using a digital multimeter, mea-
Resistance 5.0 Ohms or Less -
sure resistance between pilot con-
Proceed to step 7.
trol wiring harness connector (WP
Resistance Greater Than 5.0 Ohms -
0007, Figure 219) terminals 4 and
Replace pilot controls wiring harness
machine ground. Resistance
(WP 0187).
should be 5.0 ohms or less.
Proceed to Test Step 14.
7. Using a digital multimeter, mea-
Resistance 5.0 Ohms or Less -
sure resistance between pilot con-
Proceed to step 8.
trol wiring harness connector (W)
Resistance Greater Than 5.0 Ohms -
0007, Figure 219) terminal 1 and
Replace pilot controls wiring harness
terminal 2. Resistance should be
(WP 0187).
5.0 ohms or less.
Proceed to Test Step 14.
8. Using a digital multimeter, mea-
Resistance 5.0 Ohms or Less -
sure resistance between pilot con-
Replace auxiliary control switches (WP
trol wiring harness connector (WP
0266).
0007, Figure 219) terminal 2 and
Connect all wiring harness connectors.
pilot control wiring harness con-
Proceed to Test Step 14.
nector (WP 0007, Figure 160) ter-
Resistance Greater Than 5.0 Ohms -
minals 16. Resistance should be
Replace pilot controls wiring harness
5.0 ohms or less.
(WP 0187).
Proceed to Test Step 14.
Test Step 9. Test Pilot Control Wiring
Harness for a Short to Voltage.
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. 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) terminals 1 and
No Continuity - Proceed to step 6.
5. There should be no continuity.
0081-11
