Troubleshooting
Owner’s Manual for MLT Light Tower
31
Section 5: Troubleshooting
General Troubleshooting
Some of the more common problems are listed in the
table below. This information is intended to be a check or
verification that simple causes can be located and fixed.
It does not cover all types of problems. Refer to the OEM
engine operator’s manual for additional troubleshooting
information.
Procedures that require in-depth knowledge
or skills should be referred to a Generac Mobile Products
Authorized Service Dealer.
(000139)
WARNING
Risk of burns. Allow engine to cool before
draining oil or coolant. Failure to do so could
result in death or serious injury.
Table 5-1. General Troubleshooting Guide
Problem
Possible Cause
Solution
Low oil pressure
shutdown
Low oil level
Verify oil level on dipstick. Add oil, if needed.
Oil leaking from engine
Visually inspect the engine for leaks.
Oil pressure switch failure
Refer to OEM engine operator’s manual to identify corrective
action.
High coolant
temperature shutdown
Low coolant level
Add coolant if needed. Allow engine to cool, then check coolant
level in radiator. Restart engine and check coolant temperature.
Stop engine immediately if coolant temperature is 210°F (99°C)
or more.
Blockage in radiator
Inspect radiator shroud and ducting for blockage and remove
any foreign matter.
Leakage in coolant hoses,
engine block, or water
pump
Inspect for visible leaks. Verify tension of water pump serpentine
drive belt.
Remove load on generator and restart engine. Verify coolant
temperature and shut engine down immediately if it starts to
overheat. Refer to the OEM engine operator’s manual for
additional information on engine overheating.
Unit cranks, but will not
start
Fuel level low
Check fuel level in tank.
Verify fuel pump operation.
Restricted air filter
Inspect air filter for blockage.
Refer to OEM engine operator’s manual for additional
information.
Overspeed or
Underspeed Shutdown
Frequency setting incorrect
Disconnect all loads and restart unit. Read frequency (Hz) in the
LCD window on controller. Frequency should read 60 Hz.
If frequency is above 60 Hz, engine speed will need to be
adjusted. Refer to the engine operator’s manual for throttle
adjustment information.
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