TM 5-2420-231-23-1
0072
Table 1. Backhoe Bucket Quick-Coupler Does Not Operate Correctly.
0072
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
Backhoe Bucket Quick-
Coupler Does Not Operate
Always inspect the wiring harness connectors that are involved in the
circuit. Poor connections can often be the cause of a problem in an
electrical circuit. Verify that all connections in the circuit are clean and
secure, and that all connections are in good condition. If a problem with a
connection is found, correct the problem and verify that this malfunction is
active before performing this procedure.
Perform an open or short circuit test at each wiring harness connection to
identify the correct wiring harness to replace.
Perform this test only if the condition is active.
Test Step 1. Check Quick-Coupler
Operation.
1. Start and run engine (TM 5-2420-
231-10).
2. Set up machine to remove back-
hoe bucket (TM 5-2420-231-10).
3. Press and hold left backhoe
Backhoe Bucket Releases From
hydraulic quick-coupler switch
Machine - Troubleshooting complete.
(Figure 1, Item 1) and right back-
Quick-Coupler Pins Do Not Release
hoe hydraulic quick-coupler switch
From Loader - Repeat procedure
(Figure 1, Item 2) to release back-
several times until backhoe bucket
hoe bucket.
releases from machine.
If backhoe bucket does not release,
proceed to Test Step 2.
4. Turn ignition switch to off position
(TM 5-2420-231-10).
