Table 1. Backhoe Bucket Quick-Coupler Does Not Operate Correctly.
TEST OR INSPECTION
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
1. Start and run engine (TM 5-2420-
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
releases from machine.
If backhoe bucket does not release,
proceed to Test Step 2.
4. Turn ignition switch to off position