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TM 10-3930-671-24
CHAPTER 2
ORGANIZATIONAL TROUBLESHOOTING
2-1.
TROUBLESHOOTING INTRODUCTION.
This section contains step-by-step procedures for identifying, locating, and isolating equipment malfunctions.
2-2.
TROUBLESHOOTING SYMPTOMS.
Table 2-1 lists the most common malfunctions found during operation of the truck. Tests or inspections and corrective
actions should be performed in the order listed. Table 2-2 lists corrective actions that can be performed by unit
maintenance. If a malfunction is not listed, or corrective action fails to correct a problem, notify DS/GS maintenance.
2-3.
UNIT TROUBLESHOOTING PROCEDURES.
Table 2-2 contains the malfunctions listed in Unit Troubleshooting Symptom Index (Table 2-1), test or inspection
instructions required to determine cause of malfunction, and corrective actions for repairing the faulty equipment. Operator
Troubleshooting Procedures (TM 10-3930-671-10) should be completed before performing Unit Troubleshooting
Procedures.
Table 2-1. Unit Troubleshooting Symptom Index
Troubleshooting Fault
Page
ENGINE
1.
Engine will not start ...........................................................................................................................
2-3
2.
Engine does not run evenly ...............................................................................................................
2-4
3.
A loss of power ..................................................................................................................................
2-5
4.
Engine temperature above normal ....................................................................................................
2-6
5.
Black exhaust smoke ........................................................................................................................
2-7
6.
White exhaust smoke ........................................................................................................................
2-8
7.
Truck slow to accelerate ....................................................................................................................
2-8
8.
Engine knocking ................................................................................................................................
2-9
HYDRAUUC SYSTEM
9.
No lift, tilt, or sideshift function ...........................................................................................................
2-9
10.
Load cannot be lifted to maximum height .........................................................................................
2-9
11.
Oil leaks at top of lift cylinder(s) ........................................................................................................
2-10
12.
Oil leaks at end of tilt cylinder(s) .......................................................................................................
2-10
13.
Oil leaks at top or end of sideshift cylinder ........................................................................................
2-10
14.
Upright lift speed sluggish .................................................................................................................
2-10
15.
Pump not delivering hydraulic fluid ....................................................................................................
2-11
16.
Pump not developing sufficient pressure ..........................................................................................
2-12
17.
Noisy pump ........................................................................................................................................
2-12
18.
Oil leaks at either end of main or auxiliary valve spool .....................................................................
2-13
19.
Spring-centered spools do not return to neutral (main or auxiliary valve) .........................................
2-13
20.
No motion, slow or jerky action of hydraulic system ..........................................................................
2-13
21.
Load will not hold (downdrift) .............................................................................................................
2-14
22.
Load drops when spool is moved from neutral to a power position ..................................................
2-14
2-1
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