12
Troubleshooting Guide
TROUBLESHOOTING AND ELECTRICAL
SYSTEM: DIESEL VEHICLES
TROUBLESHOOTING GUIDE
SYMPTOM
POSSIBLE CAUSES
REFER TO
Oil level is low
Add engine oil. See owner’s manual.
Oil level sensor failure
See the Kubota D722 diesel engine manual
(CC P/N 103840201).
Low oil warning light stays on.
Low oil warning circuit malfunction
Test Procedure 29 – Low Oil Warning Light
Improper engine oil
High oil pressure.
Relief valve failed
See the Kubota D722 diesel engine manual
(CC P/N 103840201).
Oil level is low
Add engine oil. See owner’s manual.
Oil strainer clogged
Oil filter clogged
Relief valve clogged with dirt
Relief valve spring is weak or broken
Excessive clearance or crankshaft bearing
Excessive clearance of rocker arm boss
Oil passage clogged
Oil pump failure
See the Kubota D722 diesel engine manual
(CC P/N 103840201).
Low oil pressure.
Improper engine oil
Drain engine oil and refill with specified engine
oil. See owner’s manual.
Oil level is low
Add engine oil. See owner’s manual.
Failed radiator fan or radiator fan circuit
Test Procedure 11 – Fan Motor on page 12-23
Thermostat switch failure
Test Procedure 10 – Thermostat Switch on
Fan relay failure
Test Procedure 9 – Fan Relay on page 12-20
Low engine coolant level
Add coolant. See owner’s manual.
Radiator fins clogged with dust
Clean radiator fins.
Internal radiator corrosion
Clean or replace radiator. Section 18 —
Radiator and Coolant System (Diesel)
Coolant lines corroded
Clean or replace coolant lines. Section 18 —
Radiator and Coolant System (Diesel)
Failed radiator cap
Replace radiator cap.
Failed radiator hose
Replace radiator hose. Section 18 — Radiator
Failed thermostat
Failed water pump
See the Kubota D722 diesel engine manual
(CC P/N 103840201).
Engine overheats.
Vehicle is overloaded
Do not overload vehicle. See owner’s manual.
Oil ring worn
Piston ring groove worn
Valve stem and/or guide worn
Excessive engine oil consumption.
Crankshaft bearing and crank pin bearing worn
See the Kubota D722 diesel engine manual
(CC P/N 103840201).
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2016 Carryall 1500/1700 and XRT 1550 Maintenance and Service Manual
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