Kubota L4400 Workshop Manual page 77

L4400 , WSM
Symptom
Engine Revolution Is
Not Smooth
Either White or Blue
Exhaust Gas Is
Observed
Either Black or Dark
Gray Exhaust Gas Is
Observed
Deficient Output
Excessive Lubricant
Oil Consumption
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Probable Cause
Fuel filter clogged or dirty
Air cleaner clogged
Fuel leak due to loose injection pipe retaining nut
Injection pump malfunctioning
Incorrect nozzle injection pressure
Injection nozzle stuck or clogged
Governor malfunctioning
Excessive engine oil
Piston ring and cylinder worn or stuck
Incorrect injection timing
Deficient compression
Overload
Low grade fuel used
Fuel filter clogged
Air cleaner clogged
Deficient nozzle injection
Incorrect injection timing
Engine's moving parts seem to be seizing
Uneven fuel injection
Deficient nozzle injection
Compression leak
Piston ring's gap facing the same direction
Oil ring worn or stuck
Piston ring groove worn
Valve stem and valve guide worn
Oil leaking due to defective seals or packing
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Change
Clean or change
Tighten nut
Repair or replace
Adjust
Repair or replace
Repair
Reduce to specified
level
Repair or replace
Adjust
Adjust top clearance
Loosen load
Use specified fuel
Change
Clean or replace
Repair or replace
nozzle
Adjust
Repair or replace
Repair or replace the
nozzle
Repair or replace the
nozzle
Replace head
gasket, tighten
cylinder head bolt,
glow plug and nozzle
holder
Shift ring gap
direction
Replace
Replace the piston
Replace
Replace
1-S2
ENGINE
Reference
Solution
Page
G-20
G-20
1-S30
1-S18, S19
1-S20
1-S19, S20
–
G-13
1-S42, S43,
S62
1-S18, S19
1-S14
–
G-8
G-20
G-20
1-S19, S20
1-S18, S19
–
1-S18, S19
1-S19, S20
1-S30, S31
1-S42, S43
1-S42, S43
1-S42, S43,
S56
1-S48, S49
–
W1014322
KiSC issued 07, 2007 A