Section V. TROUBLESHOOTING
3-44. General
3-45. Troubleshooting
This section provides information useful in diagnosing
Refer to table 3-3 for listing of possible malfunctions.
and correcting unsatisfactory operation or failure of the
Any trouble beyond scope of organizational
crane-shovel and its components. Malfunctions which
maintenance personnel shall be reported to direct
may occur are stated, and followed by a list of probable
support maintenance.
causes of the trouble.
The corrective action
recommended is described opposite the probable cause.
Table 3-3. Troubleshooting
Malfunction
Probable cause
Corrective action
1
Engine will not start ---------------- a.
No fuel, or fuel shutoff valve closed. a.
Open fuel shutoff valve, or fill tank.
b.
Low temperature --------------------------- b.
Use cold weather starting aid (para 2-25).
c.
Loss of fuel, or air leak ------------------- c.
Tighten loose fuel connections.
Prime fuel system (para 3-77).
d.
Defective batteries ---------------------
d.
Replace or recharge batteries (para 3-81).
e.
Improper valve clearance --------------- e.
Adjust valves (para 3-60).
2
Engine hard to start ---------------- a.
Air in fuel, or no fuel .--------------------- a.
Tighten loose connections, prime
fuel system (para 3-77) and
service fuel tank.
b.
Low ambient temperature ---------------
b.
Use cold weather starting aid (para 2-25).
c.
Clogged air cleaner .----------------------
c.
Service air cleaner (para 3-11).
3
Engine starts but will not run,
a.
Low on fuel ---------------------------------
a.
Service fuel tank.
or stalls frequently
b.
Wrong type of fuel -----------------------
b.
Drain fuel tank and service with proper fuel.
c.
Loss of fuel----------------------------------
c.
Tighten loose fuel line connections
then prime system (para 3-77).
d.
Fuel filters clogged .---------------------- d.
Service fuel filters (pare 3-18).
e.
Air cleaner clogged or defective ------ e.
Service air cleaners (pars 3-11) or
replace defective air cleaner (para 3-69).
4
Engine starts but misfires, or
a.
Wrong fuel in tank .------------------------
a.
Drain tank and service with proper grade fuel.
b.
Fuel filters clogged.------------------------
b.
Service fuel filters (para 3-18).
c.
Air cleaner clogged .-----------------------
c.
Service air cleaner (para 3-11).
d.
Fuel injector defective -------------------
d.
Replace fuel injector (para 3-68).
5
Engine lacks power ---------------
a.
Air cleaner clogged or damaged
a.
Service dirty air cleaner (para 3-11 or
replace defective air cleaner (para 3-69).
b.
Fuel filter, clogged or defective -------- b.
Service fuel filters (para 3-18).
Replace defective filter
c.
Defective fuel lines ----------------------- c.
Tighten loose lines or fittings
Replace a defective line (para 3-71).
6
Engine overheats ------------------
a.
Loose fan belt ------------------------------ a.
Adjust (para 3-21).
b.
Obstructions in fins of radiator --------- b.
Clean fins.
c.
Collapsed hose or loose connections c.
Check condition of coolant hose.
Tighten loose connections, or replace
defective hose (para 3-105).
d.
Low on coolant ----------------------------- d.
Service radiator (para 3-20).
e.
Oil low in crankcase ---------------------- e.
Check oil level Add when necessary
(LO 5-3810-201-12).
f.
Defective thermostat ---------------------- f.
Replace (para 3-105).
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