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
2. Using a digital multimeter, test for
Continuity - Replace right backhoe
Backhoe Bucket Quick-
continuity between left backhoe
quick-coupler switch (WP 0172).
Coupler Does Not Operate -
quick-coupler switch (WP 0007,
Connect all wiring harness connectors.
Continued
Figure 210) terminals 2 and 3.
Proceed to Test Step 7.
There should be no continuity.
No Continuity - Proceed to step 4.
3. Remove left backhoe quick-cou-
pler switch (Figure 2, Item 2) from
rear instrument bezel (Figure 2,
Item 4).
4. Press and hold left backhoe quick-
coupler switch in the unlock posi-
tion.
5. Using a digital multimeter, mea-
Resistance 5.0 Ohms or Less -
sure resistance between left back-
Proceed to Test Step 5.
hoe quick-coupler switch (WP
Resistance Greater Than 5.0 Ohms -
0007, Figure 210) terminals 2 and
Replace right backhoe quick-coupler
3. Resistance should be 5.0 ohms
switch (WP 0172).
or less.
Connect all wiring harness connectors.
Proceed to Test Step 7.
Test Step 5. Test Backhoe Quick-
Coupler Solenoid Control Circuit for
an Open.
1. Remove instrument panel right-
side cover (WP 0176).
2. Disconnect chassis options wiring
harness connector (WP 0007, Fig-
ure 42) from side options wiring
harness connector (WP 0007, Fig-
ure 43) (WP 0255).
3. Using a digital multimeter, mea-
Resistance 5.0 Ohms or Less -
sure resistance between side
Proceed to step 4.
options wiring harness connector
Resistance Greater Than 5.0 Ohms -
(WP 0007, Figure 209) terminal 3
Replace side options wiring harness
and side options wiring harness
(WP 0255)
connector (WP 0007, Figure 43)
Connect all wiring harness connectors.
terminal H. Resistance should be
Proceed to Test Step 7.
5.0 ohms or less.
4. Disconnect chassis options wiring
harness connector (WP 0007, Fig-
ure 215) from backhoe quick-cou-
pler solenoid (WP 0260).
5. With an assistant, install a jumper
wire between chassis options wir-
ing harness connector (WP 0007,
Figure 42) terminal H and machine
ground.
0072-8