5: Maintenance 375, 375H, 400HH, 425, 425H T4F User Manual
02250223-036 R01
58 Subject to EAR, ECCN EAR99 and related export control restrictions.
Engine coolant tem-
perature high
Engine coolant temperature switch
is open
Check wiring connection to the switch and
tighten if necessary
Check switch continuity to ground and
replace if necessary
Cooling air flow is insufficient
Clean cooler and check for proper ventila-
tion
Loose or broken fan belt Tighten or replace belt
Low engine coolant
Fill with proper water/glycol mixture as
required
Faulty water pump Change pump
Defective engine thermostat Change thermostat element
Engine problems might be present Refer to the Engine Operator’s Manual
Engine oil pressure
low
Engine oil pressure switch is open
Check wiring connection to switch and
tighten if necessary
Install gauge in parallel with the switch.
Replace the switch if the pressure exceeds
15 psig and stays open. If the pressure is
less than 15 psig, refer to the Engine Oper-
ator’s Manual.
Engine speed too low
Low battery voltage
Check the battery cables and tighten if nec-
essary
Recharge or replace battery if necessary
No fuel Refuel
Water or dirt in the fuel and/or filter
Drain water from the fuel/water separators
on the fuel filters. Siphon water from the
fuel tank and clean the tank if necessary
Plugged air filter Clean and replace if necessary
Plugged fuel filter Replace the fuel filter
Engine problems
Turn the compressor OFF. Use controller
menu and user interface buttons to deter-
mine engine or compressor fault. See Sec-
tion 5.11: Single Axle Controller priority
messages for probable cause.
Check alternator “W” terminal 7.5 ± 2.50
VAC > than 300Hz.
Starter solenoid relay does not
engage
Check wiring and tighten all connectors.
Replace relay.
No input frequency from alternator
Check alternator “W” terminal (7.5 ± 2.50
VAC greater than 300 Hz)
Low fuel level No fuel Check fuel level and fill tank if empty
Table 5-2: Troubleshooting guide
Symptom Probable cause Remedy
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