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62-11175 COMFORTPRO SERVICE MANUAL
3-3
SYMPTOM
PROBABLE CAUSE
SOLUTION
REFERENCE
Engine does not start
•
Low battery voltage to the APU
•
Check battery cables/charge battery
•
A-13
(starter does not work)
•
Starter/solenoid defective
•
Repair/replace
•
Kubota Manual*
•
Poor positive cable connection
•
Check/repair
•
Poor ground cable connection
•
Check/repair
Engine will not stop
•
Starter solenoid jammed
•
Replace start solenoid or starter
•
Kubota Manual*
•
Fuel solenoid bolt missing
•
Check bolt
•
Speed control linkage broken
•
Replace control linkage
Engine runs rough
•
Fuel filters clogged or dirty
•
Replace
•
A-8
•
Air filter plugged or dirty
•
Clean/replace
•
A-3
•
Fuel leak due to loose injection
•
Tighten nut
•
Kubota Manual*
pipe retaining nut
•
Injection nozzle clogged/defective
•
Clean/replace
•
Kubota Manual*
•
Injection pump defective
•
Replace
•
Kubota Manual*
•
Uneven cylinder compression
•
Repair/replace engine
•
Kubota Manual*
•
Incorrect valve clearance
•
Adjust
•
Kubota Manual*
•
Fuel return line clogged/kinked
•
Clean/replace
•
Kubota Manual*
•
Governor defective
•
Repair/replace
Smoking
(white or
•
Excessive engine oil
•
Reduce to specified level
•
A-2
blue exhaust)
•
Piston ring worn or stuck
•
Repair/replace engine
•
Kubota Manual*
•
Incorrect injector timing
•
Repair
•
Kubota Manual*
•
Low cylinder compression
•
Repair/replace engine
•
Kubota Manual*
•
Coolant in combustion chamber
•
Repair/replace engine
•
Kubota Manual*
Smoking
(black or
•
Overloaded power draw
•
Reduce power consumption
dark gray exhaust)
•
Low fuel grade
•
Use specified fuel grade
•
Fuel filters clogged
•
Replace
•
A-3
•
Air cleaner clogged
•
Clean/replace
•
A-3
Unable to bleed coolant
•
Air lock
•
Run Truck engine until 185°F
•
A-9
•
No coolant flow
•
Check for blockages using flow indicator
•
Kinked coolant lines
•
Straighten
•
Shut-off valves 'OFF'
•
Turn 'ON'
•
Incorrect plumbing
•
Re-plumb
•
Small fittings on truck engine
•
Change to larger fittings (3/4")
Excessive oil
•
Oil ring worn
•
Replace
•
Kubota Manual*
consumption
•
Piston ring groove worn
•
Replace the piston
•
Kubota Manual*
•
Valve stem and guide worn
•
Replace
•
Kubota Manual*
•
Crankshaft bearing and crank
•
Replace
•
Kubota Manual*
pin bearing worn
•
Air filter clogged
•
Replace filter
•
A-3
*Kubota Workshop Manual 97897-02400