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 11. Test Pilot Control
Backhoe Auxiliary Hydraulic
Wiring Harness to Backhoe Auxiliary
Control Does Not Operate
Forward Control Solenoid for an
Correctly - Continued
Open.
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 223) 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 15.
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 223) terminals 1 and
terminals 2 and 15.
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 pilot control valve (WP 0264).
Proceed to Test Step 14.
Resistance Greater Than 5.0 Ohms -
Replace pilot controls wiring harness
(WP 0187).
Proceed to Test Step 14.
Test Step 12. Test Pilot Control
Wiring Harness to Backhoe Auxiliary
Reverse Control Solenoid for a
Short.
1. Using a digital multimeter, mea-
Resistance 4.0 - 7.0 Ohms - Connect
sure resistance between pilot con-
pilot control wiring harness connector
trol wiring harness connector (WP
(WP 0007, Figure 219) to LH tower
0007, Figure 160) terminals 2 and
wiring harness connector (WP 0007,
23. Resistance should be 4.0 - 7.0
Figure 220).
ohms.
Install left tower boot (WP 0287).
Replace pilot control valve (WP 0264).
Proceed to Test Step 14.
Resistance Less Than 4.0 Ohms -
Proceed to step 2.
Resistance Greater Than 7.0 Ohms -
Proceed to Test Step 13.
0081-13