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ALL MACHINE (HYDRAULIC) TOOLS WILL NOT OPERATE cont'd
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TM-5-2420-224-20-1 Tractor Wheeled 4x4 DED Small Emplacement Excavator (SEE) and High Mobility Material Handler (HMMH) Manual
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FRONT LOADER WILL NOT OPERATE USING BUCKET SWITCH (SEE). cont'd
TM 5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM (CONT)
77. FRONT LOADER WILL NOT OPERATE USING BUCKET SWITCH (SEE).
NOTE
Vehicle MASTER disconnect switch must be ON and ignition switch set to ON.
Failure to do so will cause erroneous results.
Refer to wiring diagram for all wiring repair steps.
Step 1. Check for +24 VDC between wire 70S (1) and ground at bucket switch (2).
If  +24 VDC is not present, repair wiring 70S between bucket
switch and connector X.
If
+24 VDC is present, go to step 2.
NOTE
Perform steps 2 and 3 for failure in down (ON) position. Perform steps 4 and 5 for failure
in UP position.
Step 2. With bucket switch (2) in DN position, check for +24 VDC between wire 71 U
(3) and ground at bucket switch.
If +24 VDC is not present, replace bucket switch (page 4-1 51).
If +24 VDC is present, go to step 3.
Step 3. With bucket switch (2) in DN position, check for +24 VDC between wire 71 U
(3) and ground at bucket solenoid (4).
If +24 VDC is not present, repair wiring 71 U between bucket
switch and bucket solenoid.
If +24 VDC is present, notify direct support maintenance.
Step 4. With bucket switch (2) in UP position, check for +24 VDC between wire 710
(5) and ground at bucket switch.
If +24 VDC is not present, replace bucket switch (page 4-151).
If +24 VDC is present, go to step 5.
Step 5. With bucket switch (2) in UP position, check for +24 VDC between wire 71 D
(5) and ground at bucket solenoid (6).
If +24 VDC is not present, repair wiring 71 D between bucket
switch and bucket solenoid.
If +24 VDC is present, notify direct support maintenance.

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