TM-9-2320-272-24-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 1 OF 4
JUNE 1998
TM-9-2320-272-24-1 - Page 172 of 1015
TM 9-2320-272-24-1
Table 2-2. Mechanical Troubleshooting (Contd).
Step 3.
Inspect spring U-bolts for looseness and damage.
a.
Tighten loose spring U-bolts 350-400 lb-ft (475-542 N•m).
b.
If damaged, replace U-bolts (para. 3-161).
Step 4.
Check steering system (malfunction 48).
END OF TESTING!
57. HARSH OR HARD RlDE
Step 1.
Check lubrication of springs, pivots, and shackle pins.
Lubricate springs, pivots, and shackle pins (LO 9-2320-272-12).
Step 2.
Check spring shackles for frozen condition.
Free shackles and lubricate (LO 9-2320-272-12).
Step 3.
Check for defective shock absorbers.
a.
Remove shock absorber from top mounting.
b.
Pull up and down on shock absorber to test resistance.
c.
If there is little or no resistance, replace shock absorber (para. 3-166).
END OF TESTING!
58. SPRING LEAF DEFECT
Step 1.
Inspect for loose and damaged front spring shackles.
If loose or damaged, replace shackles (para. 3-162).
Step 2.
Inspect spring U-bolts for looseness and damage.
a.
Tighten loose spring U-bolts 350-400 lb-ft (475-542 N•m).
b.
If damaged, replace U-bolts (para. 3-161).
Step 3.
Inspect front leaf springs for breaks.
If broken, replace main leaves (para. 3-161).
END OF TESTING!
WINCH
59. WINCH DOES NOT OPERATE
Step 1.
Check hydraulic oil reservoir for proper fluid level.
a.
Fill hydraulic oil reservoir to proper oil level (LO 9-2320-272-12).
b.
Check for evidence of oil leaks and damage to reservoir.
c.
If leaks are found, tighten any loose connections or fittings.
d.
If damaged, replace reservoir (para. 3-337 or 3-338).
Step 2.
Check PTO and winch controls for kinks, damage, breaks, and improper lubrication (front
winch).
a.
Lubricate if necessary (LO 9-2320-272-12).
b.
If winch or PTO cable is kinked, damaged, or broken, notify DS maintenance.
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