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System
Faults
Possible causes
Solutions
HST
When operating HST
pedal, tractor dose not
start.
▲
Low pressure relief set is too
low
▲
High pressure relief set is too
low
▲
HST charger valve fault
▲
Filter clogged
▲
Pump worn or part damaged
▲
HST moving part worn or
damaged
▲
Check and repair
▲
Check and repair
▲
Replace
▲
Replace filter
▲
Repair or replace
▲
Repair or replace after
check the circuit.
Tractor is still moving
despite pedal bring in
neutral position on
HST pedal.
▲
Neutral position of HST pedal
is changed.
▲
HST pedal linkage damaged.
▲
HST arm bolt loosened.
▲
Adjust neutral position
▲
Replace damaged part
▲
Fasten the bolt with
adhesive
HST power is too low
▲
Oil shortage
▲
Air in HST circuit
▲
Transmission oil temperature
is too high.
▲
HST moving part worn
▲
HST filter clogged
▲
Add oil
▲
Check and repair the
hydraulic suction line.
▲
Stop engine to cool the oil,
and restart.
▲
Repair or replace
▲
Replace the filter
Abnormal noise
▲
Engine speed is too low.
▲
Oil temperature is too low.
▲
Hydraulic oil filter clogged
▲
Oil shortage
▲
Set engine rpm over 1500
rev/min
▲
Run engine to warm up
the oil.
▲
Replace the filter
▲
Add oil
