Checking The Oil Pump Gears And Shafts; Checking The Relief Valve; Checking The Bearings And Oil Seals; Checking The Circlips And Washers - Yamaha 2004 YP400 Service Manual

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CRANKSHAFT
CHECKING THE OIL PUMP GEARS AND
SHAFTS
1. Check:
• oil pump drive gear
• oil pump driven gear
• oil pump drive gear shaft
• oil pump driven gear shaft
Cracks/damage/wear → Replace the defec-
tive part(s).
EAS00365

CHECKING THE RELIEF VALVE

1. Check:
• relief valve body 1
• relief valve 2
• spring 3
Damage/wear → Replace the defective
part(s).
EAS00401
CHECKING THE BEARINGS AND OIL
SEALS
1. Check:
• bearings
Clean and lubricate the bearings, then
rotate the inner race with your finger.
Rough movement → Replace.
2. Check:
• oil seals
Damage/wear → Replace.
EAS00402

CHECKING THE CIRCLIPS AND WASHERS

1. Check:
• circlips
Bends/damage/looseness → Replace.
• washers
Bends/damage → Replace.
ENG