Kubota Z400-B Handbuch Seite 91

Symptom
I
Probable Cause Solution
Reference
Page
Excessive lubricant • Piston ring's gap facing the same direction
Shih ring gap direction S-83
oil consumption
• Oil ring worn or stuck
Replace
S·109
• Piston ring groove worn
Replace the piston
S·109
• Valve stem and guide worn
Replace S-87
• Crankshaft bearing, and crank pin
Replace
5-99,S-101
bearing worn S-105
Fuel mixed into
lubricant oil
• Injection pump's plunger worn
• Fuel feed pump broken
Replace pump element or pump
Replace
S·121, S-123
Water mixed into
lubricant oil
• Head gasket defective
• Crank case or cylinder head flawed
Replace
Replace
S-67
S-85
Low oil pressure
• Engine oil insufficient
Replenish
S-29
• Oil strainer clogged Clean S-81
• Oil filter cartridge clogged
• Relief valve stuck with dirt
• Rei ief valve spring weaken or broken
Replace
Clean
Replace
5-31
• Excessive oil clearance of crankshaft bearing
Replace S-99, S·101
• Excessive oil clearance of crank pin bearing Replace
S-105
• Excessive oil clearance of rocker arm bushing
• Oil passage clogged
Replace
Clean
S-91, S-93
• Different type of oil
Use the specified type of oil S-29
• Oil pump defective Repair or replace
S-113
High oil pressure
• Different type of oil
• Rei ief valve defective
Use the specified type of oil
Replace
S-29
Engine overheated
• Engine oil insufficient Replenish
S-29
• Fan belt broken or tensioned improperly
Replace or adjust
S-41,S-115
• Cooling water insufficient Replenish S-35
• Use of ant ifreeze
• Radiator net and radiator fin clogged with dust
Use water only
Clean
S-39
• Inside of radiator corroded
Clean or replace S-37
• Cooling water flow route corroded Clean or replace 5-37
• Radiator cap defective Replace S-l17
• Water pipe damaged
Replace
5-37
• Thermostat defective Replace
5-115, S-117
• Water pump defective
Replace S-117
• Mechanical seal defective
• Overload running
Replace
Loosen the load
S-117
• Head gasket defective
Replace
S-67
• Incorrect injection timing
• Unsuitable fuel used
Adjust
Use the speci fied fuel
S-119
Battery quickly
• Battery fluid insufficient
Replenish distilled water and charge
discharge
• Fan belt slips
• Wiring disconnected
Adjust belt tension or replace
Connect
5-41, S·115
• Regulator defective Replace S-155, S-157
• AC dynamo defective
• Battery defective
Replace
Replace
5-155, S-157
S-9