TM-9-2320-272-23-5

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 5 OF 5

SEPTEMBER 2012

TM-9-2320-272-23-5 - Page 349 of 623

CLEANING AND INSPECTION

WARNING

Eyeshields must be worn when cleaning with compressed air. Compressed air source will

not exceed 30 psi (207 kPa). Failure to comply may result in injury or death to personnel.

1.

Dry all parts and clear all passages with compressed air.

2.

Inspect base plate, cover plate, and valve body for cracks and stripped threads. Replace if damaged.

3.

Inspect relief valve for bends, cracks, and stripped threads. Replace relief valve if bent, cracked, or threads

are stripped.

4.

Inspect wiring harness for broken wires or cracked insulation. Replace wiring harness if wires are broken or

insulation is cracked.

NOTE

Perform Step (5) if condition of wiring harness, as inspected in Step (4), is satisfactory.

5.

Using the following table, Electrical Connections, check wiring harness (Figure 3, Item 1) for continuity as

follows:

a.

Check for continuity between pin A and pin E.

b.

Check for continuity between pin A and pin F.

c.

Check for continuity between pin B and pin D.

d.

Replace wiring harness if continuity check a, b, or c fails.

TM 9-2320-272-23-5

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