Troubleshooting - Kubota WSM Workshop Manual

ZD18(F) · ZD21(F) · ZD28(F), WSM

1. TROUBLESHOOTING

Symptom
Engine Does Not
Start
(Starter Does Not
Run)
Probable Cause
• No fuel
• Air in the fuel system
• Water in the fuel system
• Fuel pipe clogged
• Fuel filter clogged
• Excessively high viscosity of fuel or engine oil
at low temperature
• Fuel with low cetane number
• Fuel leak due to loose injection pipe retaining
nut
• Incorrect injection timing
• Fuel camshaft worn
• Injection nozzle clogged
• Injection pump malfunctioning
• Seizure of crankshaft, camshaft, piston,
cylinder or bearing
• Compression leak from cylinder
• Improper valve timing
• Piston ring and cylinder worn
• Excessive valve clearance
• Battery discharged
• Starter malfunctioning
• Slow blow fuse blown
• Main switch malfunctioning
• PTO switch defective
• Parking brake switch defective
• Motion control lever switch defective
• Seat switch defective
• Wiring harness disconnected
Replenish fuel
Bleed fuel system
Change fuel and
replace fuel system
Clean fuel pipe
Replace fuel filter
Use specified fuel or
engine oil
Use specified fuel
Tighten retaining nut
Adjust injection
timing
Replace fuel
camshaft
Clean injection
nozzle
Repair or replace
injection pump
Replace crankshaft,
camshaft, piston,
cylinder or bearing
Replace head
gasket, tighten
cylinder head screw,
glow plug and nozzle
holder
Correct valve timing
Replace piston ring
Adjust valve
clearance
Charge battery
Repair or replace
starter
Replace slow blow
fuse
Repair or replace
main switch
Replace PTO switch
Replace brake switch
Replace reverse
switch or adjust
reverse switch gap
Replace seat switch
Connect wiring
harness
1-S1
ENGINE
Reference
Solution
Page
–
–
–
–
G-32
G-7
G-7
1-S28
1-S73
1-S33, S35
1-S75
1-S31, S35
1-S37, 38,
S42
1-S28, S30
1-S27
1-S40
1-S27
G-26
5-S12
G-36
5-S8
5-S10
5-S10
5-S10
5-S10
–
W1066187
KiSC issued 04, 2009 A