STEERING
M6040, M7040, WSM
7-S1
1. TROUBLESHOOTING
9Y1210143STS0001US0
Symptom Probable Cause Solution
Reference
Page
Tractor Cannot Be
Steered
Drive shaft in the power steering controller
improper assembled
Reassemble –
Pipe broken Replace 7-S10
Hard Steering Oil improper Change with
specified oil
G-10
Hydraulic pump malfunctioning Replace 8-S18
Relief valve malfunctioning Replace 7-S4
Controller (spool and sleeve) malfunctioning Repair or replace 7-S10
Oil leak due to seal damaged Replace –
Steering Force
Fluctuates
Controller malfunctioning Replace 7-S5,
7-S10
Air sucked in pump due to leaking or missing of
oil
Replenish G-10
Air sucked in pump from suction circuit Repair –
Heavy Steering
Especially in the
Beginning of Steering
Controller malfunctioning Repair or replace 7-S5,
7-S10
Steering Wheel Turns
Spontaneously When
Released
Controller malfunctioning Repair or replace 7-S5,
7-S10
Front Wheels Wander
to Right and Left
Controller malfunctioning Repair or replace 7-S5,
7-S10
Air sucked in pump due to lack of oil Replenish G-10
Air sucked in pump from suction circuit Repair –
Insufficient bleeding Bleed –
Cylinder malfunctioning Repair or replace 7-S8,
7-S12
Wheels Are Turned to
a Direction Opposite
to Steering Direction
Cylinder piping connected in reverse Repair –
Steering Wheel Turns
Idle in Manual
Steering
Insufficient bleeding Bleed –
Air sucked in pump due to lack of oil Replenish G-10
Noise Air sucked in pump due to lack of oil Replenish G-10
Air sucked in pump from suction circuit Repair –
Pipe deformed Replace –
Oil Temperature
Increases Rapidly
Relief valve malfunctioning Replace 7-S4
Front Wheels Vibrate Mechanical connections or wheel bearings worn Replace defective
parts
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