C-72
35 Series 4WD, Model - 3535, 4035, 4535 and 5035 SM June’08
TROUBLE SHOOTING
Much can be learned about the condition of an engine if a good visual inspection is performance before
the actual cleaning operations begin.
After cleaning, the exterior of the engine should once more be inspected carefully and a note made of
any parts such as brackets, covers, etc., that are bent, broken, rusted or missing completely. The crankcase
or cylinder block should be checked for evidence of freezing around core plugs or for actual breaks in
the water jacket.
Probable Cause Remedy
Engine Fails to Turn
1. Batteries too low to turn engine - - - - - - - - - - - - Charge batteries or install new ones.
2. Starting switch inoperative - - - - - - - - - - - - - - - - Inspect for faulty cables an terminals.
Replace starting switch if necessary.
3. Cranking motor inoperative - - - - - - - - - - - - - - - Refer to Service Manual “Electrical Equipment”.
4. Engine oil too heavy - - - - - - - - - - - - - - - - - - - - - Use correct grade of lubricating oil as specified in
the operator’s manual.
5. Internal seizure - - - - - - - - - - - - - - - - - - - - - - - - - Hand crank the engine. If the engine does not turn
easily, seizure due to internal damage; including
gear train, pistons, sleeves, connecting rods or main
bearings, is indicated.
6. Hydrostatic lock - - - - - - - - - - - - - - - - - - - - - - - - Remove all the injection nozzles and crank the
engine. Check for fuel or coolant in the cylinder.
Engines Does Not Start / Engine Start But does not Develop Full Power
1. Low or no fuel pressure
a. Insufficient fuel - - - - - - - - - - - - - - - - - - - - - - Check fuel tank.
b. Fuel oil filter clogged - - - - - - - - - - - - - - - - - - Replace filters.
c. Fuel filter gaskets defective
(air being drawn into fuel) - - - - - - - - - - - - - - Replace gaskets.
d. Moisture in fuel tank - - - - - - - - - - - - - - - - - - Drain entire system and fuel filter. Refill with clean
fuel, and vent the air from the system.
2. Poor fuel - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Use a good grade of fuel.
3. Air cleaner clogged - - - - - - - - - - - - - - - - - - - - - - Remove and service air cleaner as described in
operator’s manual
4. Injection pump not properly timed
to the engine - - - - - - - - - - - - - - - - - - - - - - - - - - Check timing.
5. Fuel line clogged or air in line - - - - - - - - - - - - - Clean fuel line and vent fuel system. Refer operator’s
manual.
6. Injection pump not operating properly - - - - - - - Remove injection pump and test it. Refer to Service
Manual “Fuel System” for test specifications.
7. One or more fuel injection nozzles
not operating properly - - - - - - - - - - - - - - - - - - - Replace the injection nozzles.
8. Loose or broken fuel lines or fittings between
injection pump and injection nozzles - - - - - - - - Tighten or repair.
9. Loose or broken connections or leaking gaskets
at intake manifold or exhaust manifold - - - - - - Tighten or repair.
10. Improper valve settings - - - - - - - - - - - - - - - - - - Reset as necessary. If out of adjustment an
excessive amount, check for bent push rods.
11. Lack of compression - - - - - - - - - - - - - - - - - - - - - Refer to “Poor Compression”
Trouble Shooting
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