TM 5-2420-231-23-1
0072
Table 1. Backhoe Bucket Quick-Coupler Does Not Operate Correctly - Continued.
072
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
6. Using a digital multimeter, mea-
Backhoe Bucket Quick-
Resistance 5.0 Ohms or Less -
sure resistance between chassis
Remove jumper wire from chassis
Coupler Does Not Operate -
options wiring harness connector
options wiring harness connector (WP
Continued
(WP 0007, Figure 215) terminal A
0007, Figure 42) terminal H and
and machine ground. Resistance
machine ground.
should be 5.0 ohms or less.
Connect chassis options wiring harness
connector (WP 0007, Figure 215) to
backhoe quick-coupler solenoid (WP
0260).
Proceed to Test Step 6.
Resistance Greater Than 5.0 Ohms -
Replace chassis options wiring
harness.
Proceed to Test Step 7.
Test Step 6. Test Quick-Coupler
Load Sense Solenoid.
1. Disconnect side options wiring har-
ness connector (WP 0007, Figure
207) from right backhoe quick-cou-
pler switch (WP 0007, Figure 208)
(WP 0176).
2. Using a digital multimeter, mea-
Resistance 5.0 Ohms or Less -
sure resistance between side
Proceed to step 3.
options wiring harness connector
Resistance Greater Than 5.0 Ohms -
(WP 0007, Figure 207) terminal 1
Replace side options wiring harness
and side options wiring harness
(WP 0255).
connector (WP 0007, Figure 43)
Connect all wiring harness connectors.
terminal G. Resistance should be
Proceed to Test Step 7.
5.0 ohms or less.
3. Disconnect chassis options wiring
harness connector (WP 0007, Fig-
ure 213) from quick-coupler load
sense solenoid (WP 0007, Figure
214) (WP 0260).
4. With an assistant, install a jumper
wire between chassis options wir-
ing harness connector (WP 0007,
Figure 42) terminal G and machine
ground.
0072-9
