TROUBLESHOOTING AND ELECTRICAL
SYSTEM: DIESEL VEHICLES
Troubleshooting Guide
12
TROUBLESHOOTING GUIDE
SYMPTOM
POSSIBLE CAUSES
REFER TO
Fuel mixed into engine lubricant oil.
Worn injection pump plunger
See the Kubota D722 diesel engine manual
(CC P/N 103840201).
Failed head gasket
Water mixed into engine lubricant oil.
Crank case or cylinder head failed
See the Kubota D722 diesel engine manual
(CC P/N 103840201).
Excessive engine oil
Drain engine oil and refill with specified engine
oil. See owner’s manual.
Piston ring worn
Incorrect injection timing
White or blue exhaust gas is observed.
Cylinder compression leak
See the Kubota D722 diesel engine manual
(CC P/N 103840201).
Vehicle is overloaded
Do not overload vehicle. See owner’s manual.
Low-grade fuel
Drain fuel and refill with specified fuel. See
owner’s manual.
Fuel filter clogged
Replace fuel filter.
Black or dark gray exhaust gas is observed.
Air cleaner clogged
Replace air filter.
Engine mounting nuts or bolts are loose
Section 16 — Diesel Engine, Muffler, Fuel
Misaligned muffler mounting clamp
Damaged drive belt
Damaged drive clutch
Damaged driven clutch
Excessive vehicle vibration.
RPM setting is incorrect
Engine RPM Adjustment on page 16-19
Transmission shifter linkage is binding or is
out of adjustment
Forward/Reverse Shifter Cable Adjustment on
Idle RPM setting is set too high
Idle RPM Adjustment on page 16-19
Insufficient (low) level of lubricant or wrong
type of lubricant in transmission
Gearcase Lubrication on page 10-16
Transmission does not engage or disengage
smoothly.
Internal gears are damaged or worn
See the Engines and Drivetrain Components
manual (CC P/N 102396501).
Failed front drive gearcase engagement coil
Test Procedure 20 – Front Drive Gearcase
Failed differential limit switch
Test Procedure 19 – Front Differential Limit
Neutral switch failure (failed closed)
Test Procedure 17 – Neutral Switch
Front differential does not engage front wheels.
Failed front gearcase
See the Engines and Drivetrain Components
manual (CC P/N 102396501).
TABLE CONTINUED ON NEXT PAGE
2016 Carryall 1500/1700 and XRT 1550 Maintenance and Service Manual
Page 12-5
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