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TM 10-3930-671 -10
CHAPTER 4
OPERATOR TROUBLESHOOTING
4-1. TROUBLESHOOTING INTRODUCTION.
This section contains step-by-step procedures for identifying, locating, and isolating equipment malfunctions.
4-2. TROUBLESHOOTING SYMPTOMS.
Table 4-1 lists the most common malfunctions found during operation of the truck. Tests or inspections and corrective
actions should be performed in the order listed. This symptom index lists corrective actions that can be performed by the
operator. If a malfunction is not listed or a corrective action fails to correct a problem, notify unit maintenance.
Table 4-1. Operator Troubleshooting Symptom Index
Troubleshooting Fault
Page
ENGINE
1
Engine will not start................................................................................................................................... 4-2
2
Engine does not run evenly....................................................................................................................... 4-2
3
A loss of power ......................................................................................................................................... 4-3
4
Engine temperature above normal ........................................................................................................... 4-3
5
Black exhaust smoke ................................................................................................................................ 4-4
6
White exhaust smoke ............................................................................................................................... 4-4
7
Truck slow to accelerate ........................................................................................................................... 4-4
8
Engine knocking ....................................................................................................................................... 4-4
HYDRAULIC SYSTEM
9.
No lift, tilt, or sideshift function .................................................................................................................. 4-5
10. Load cannot be lifted to maximum height ................................................................................................. 4-5
11. Upright lift speed sluggish......................................................................................................................... 4-5
12. Pump not delivering hydraulic fluid ........................................................................................................... 4-5
TRANSAXLE
13. Transaxle will not operate in forward or reverse....................................................................................... 4-6
14. Transaxle shifts slowly .............................................................................................................................. 4-6
15. Transaxle slips .......................................................................................................................................... 4-6
16. Transaxle lacks power .............................................................................................................................. 4-6
17. Transaxle overheats ................................................................................................................................. 4-7
ELECTRICAL SYSTEM
18. Engine will not crank ................................................................................................................................. 4-7
19. Gauges do not operate ............................................................................................................................. 4-7
20. Cold start system does not operate .......................................................................................................... 4-8
21. Horn does not operate .............................................................................................................................. 4-8
22. Transmission oil temperature and engine oil pressure lights do not operate ........................................... 4-8
23. Brakelight does not operate...................................................................................................................... 4-8
24. Front floodlights do not operate ................................................................................................................ 4-9
25. Rear floodlights do not operate................................................................................................................. 4-9
4-1
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