Hydraulic System Troubleshooting.

Maintenance of the Heavy Expanded Mobility Tactical Truck (HEMTT)
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43 and 44. After these procedures have been completed, he is ready to

begin the actual troubleshooting procedure.

SGT Gilmore disconnects the batteries following the procedures

contained in paragraph 7-91 of TM 9-2320-279-20-1.

He then removes

the instrument panel following the procedures contained in paragraph

7-19 of TM 9-2320-279-20-1.

After the instrument panel has been

removed, SGT Gilmore checks for loose or broken wires on the gages.

SGT Gilmore found several broken wires that will need to be repaired.

There are many different types of electrical connectors used to attach

wires or cables to electrical components on this vehicle. To install

wires in crimp-type connectors, refer to FM 55-506-1.

SGT Gilmore

locates the procedure(s) in this FM and repairs the broken wires.

Once the wires have been repaired, he reinstalls the instrument panel

and reconnects the batteries.

He then performs an operational check

of the gages to ensure that they are functioning properly.

Hydraulic System Troubleshooting.

In the following paragraphs,

we will follow SGT Clarke as he troubleshoots an M977 for the

malfunction ONE OR MORE HYDRAULIC CIRCUITS NOT WORKING and reaches the

conclusion that the oil level in the reservoir is low and needs to be

replenished.

Prior to beginning the troubleshooting procedure, SGT

Clarke performs the preliminary procedures contained in paragraph 2c,

pages 43 and 44.

After these procedures have been performed, he

begins the actual troubleshooting procedures.

Step 1.

SGT Clarke checks the selector valve for faulty operation,

loose line connections, or damage.

Since the valve functions

properly, the line connections were not loose, and the valve showed no

outward signs of damage, he proceeds to step 2.