Section 5 - Troubleshooting; General Troubleshooting - Generac Power Systems Magnum Series Operating Manual

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 trained technician.
Problem
Low Fuel Level Shut-
down
Low Oil Pressure
Shutdown
Low Coolant Level
Shutdown
High Coolant Tem-
perature Shutdown
33722 D

Section 5 - Troubleshooting

Table 1 - General Troubleshooting Guide
Possible Cause
Low fuel level
Unit not level
Fuel tank leaking
Damaged fuel sender or
wiring
Low oil level
Oil leaking from engine
Oil pressure sender
Low coolant level
Coolant hoses leaking
Engine block or water
pump leaking
Low coolant level
Blockage in radiator
Leakage in coolant
hoses, engine block, or
water pump
MMG130DI4/175DI4/205DI4 Operating Manual
Check fuel level in LCD window of controller.
Verify unit is sitting level to ensure an accurate reading.
Check tank for leaks.
Check for continuity between sender and engine controller.
(Refer to DC wiring diagram.)
Check oil level on dipstick. Add oil, if needed.
Visually inspect the engine for leaks. Restart unit and verify
loss of pressure. Shut down immediately if pressure does
not reach 5 psi (34 kPa) within five seconds.
See the OEM engine operator's manual to identify correc-
tive action.
Allow engine to cool, then check coolant level in radiator.
Add coolant if needed.
Inspect hoses for leaks. Repair or replace as necessary.
Visually inspect for leaks. Verify no coolant has mixed with
the engine oil (oil will appear milky). See the OEM engine
operator's manual for additional information.
Add coolant if needed. Allow engine to cool, then check
coolant level in radiator. Restart engine and check coolant
temperature (on controller). Stop engine immediately if
coolant temperature is 210°F (99°C) or more.
Check radiator shroud and ducting for blockage and
remove any foreign matter.
Inspect for visible leaks. Check tension of water pump ser-
pentine drive belt.
Remove load on generator and restart engine. Check cool-
ant temperature and shut engine down immediately if it
starts to overheat. See the OEM engine operator's manual
for additional information on engine overheating.
Solution
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