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SYMPTOM
PROBABLE CAUSE
SOLUTION
REFERENCE
Oil level increases
•
Diesel fuel getting to oil pan
•
Replace O-ring in lower portion
•
Kubota Manual*
through governor lever
of governor lever
•
Fuel lift pump diaphragm defective
•
Replace
•
Kubota Manual*
Low oil pressure
•
Engine oil insufficient
•
Replenish
•
A-2
•
Oil strainer clogged
•
Clean
•
Kubota Manual*
•
Oil filter clogged
•
Replace
•
Kubota Manual*
•
Relief valve stuck with dirt
•
Clean
•
Relief valve spring weakened
•
Replace
or broken
•
Excessive oil clearance of
•
Replace
•
Kubota Manual*
crankshaft bearings
•
Excessive oil clearance of rocker
•
Replace
•
Kubota Manual*
arm boss
•
Oil passage clogged
•
Clean
•
Different type of oil
•
Use the specified type
•
A-2
•
Oil pump defective
•
Repair/replace
•
Kubota Manual*
High oil pressure
•
Different type of oil
•
Use the specified type
•
A-2
•
Relief valve defective
•
Replace
Engine overheated
•
Engine oil insufficient
•
Replenish
•
A-2
•
Fan belt broken or loose
•
Repair/replace
•
A-2
•
Air lock
•
Check for air lock in Kubota engine
•
A-9
and ensure there is coolant, purge
if necessary
•
Coolant level insufficient
•
Add coolant, purge if necessary
•
A-9
•
Coolant flow is restricted
•
Repair Plumbing
•
Thermostat stuck
•
Replace
•
Kubota Manual*
•
Water pump defective
•
Replace
•
Kubota Manual*
Overcharging of
•
Alternator malfunctioning
•
Replace
•
A-13
batteries
•
Poor positive/ground connections
•
Repair
•
Batteries defective
•
Load test or replace batteries
Dead batteries or
•
Alternator malfunctioning
•
Replace
•
A-13
undercharge
•
Poor alternator connection
•
Check alternator connection
•
DC load too high
•
Reduce load
•
Poor positive/ground connections
•
Check connections
•
Alternator belt loose/worn
•
Replace or tighten
•
Kubota Manual*
APU suddenly stops
•
Low oil pressure
•
See "Low oil pressure"
•
A-6
("Check APU" message
•
Overheat
•
See "Engine overheated"
•
A-6
on Driver Control Panel
•
Alternator Feedback
•
See "Alternator Troubleshooting"
•
3-15, A-13
62-11175 COMFORTPRO SERVICE MANUAL
3-4
Do not turn the Driver Control
Panel off. Go to the APU and
look at the APU Control Unit
lights for the correct code.
*Kubota Workshop Manual 97897-02400