Yanmar YM276 Service Manual page 661

Hydraulic System Tests and Diagnosi?
270-20.13
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HYDRAULIC PUMP
PROBLEM
No pump output
Pump noise
POSSIBLE CAUSE
Hydraulic fluid insufficient
Pump drive broken
Pump shaft broken
Pump shaft key broken
Hydraulic fluid insufficient
Cavitation (air being drawn in)
Pump improperly fitted
Oil viscosity too high
Pump gear faulty
Pump drive connector broken
Pump drive gear broken
LOW pump output
Filter screen clogged
Cartridge filter clogged
Pump gears worn
c
Pump
shaft
key, connector
Pressure relief setting t o o high
on pump housing broken
Auxiliary control valve broken
Pump installed
180 degrees off
Auxiliary hydraulicconnectors
improperly connected
SUGGESTED REMEDY
Check
Replace pump drive
Replace pump
Replace key
Check
Check pipe O-ring and
rubber connections
Reinstall
Check
Replace pump
Replace connector
Replace gear
Check and clean
Replace cartridge
Replace pump
Adjust
Replace valve
Reinstall
[See arrow or "IN" and "OUT"
marks1
Reconnect
SME2760111&704 VM276 and 276D
Kinomoro, Prinred in J-pan