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
2. Disconnect pilot control wiring har-
Backhoe Auxiliary Hydraulic
ness connector (WP 0007, Figure
Control Does Not Operate
221) from backhoe auxiliary
Correctly - Continued
reverse solenoid (WP 0007, Figure
222).
3. 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 221) terminals 1 and
No Continuity - Proceed to step 4.
2. There should be no continuity.
4. 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 221) 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.
Test Step 13. Test for Open Pilot
Control Wiring Harness to Backhoe
Auxiliary Reverse Control Solenoid.
1. Using a digital multimeter, mea-
Resistance 5.0 Ohms or Less -
sure resistance between pilot con-
Proceed to step 2.
trol wiring harness connector (WP
Resistance Greater Than 5.0 Ohms -
0007, Figure 221) terminal 1 and
Replace pilot controls wiring harness
machine ground. Resistance
(WP 0187).
should be 5.0 ohms or less.
Proceed to Test Step 14.
2. Install a jumper wire between pilot
control wiring harness connector
(WP 0007, Figure 160) terminals 2
and 23.
3. Using a digital multimeter, mea-
Resistance 5.0 Ohms or Less -
sure resistance between pilot con-
Remove jumper from pilot control wiring
trol wiring harness connector (WP
harness (WP 0007, Figure 160)
0007, Figure 160) terminals 1 and
terminals 2 and 23.
2. Resistance should be 5.0 ohms
Connect pilot control wiring harness
or less.
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.
Resistance Greater Than 5.0 Ohms -
Replace pilot controls wiring harness
(WP 0187).
Proceed to Test Step 14.
0081-14
