GM Series
TM19040 P.30/31
Phenomenon 1
Phenomenon 2
Possible cause
Countermeasure
The surface temperature of the reduction gears is high
Lack of lubricants
Replenish to proper amount.
Pitting occurs in bearings and gears
Replace GM.
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Hydraulic oil enters the gear case
Replace the oil seal and lubricants.
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Meander (when used as a
travel motor)
Occurring at low pressure
The left and right discharge oils are
different
Repair the pump.
The left and right hydraulic motor
drains are different
Replace GM.
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Occurring at high pressure
The left and right discharge oils are
different
Repair the pump or the control valve.
The left and right hydraulic motor
drains are different
Replace GM.
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The left and right brake valves
movement are different
Replace the brake valve.
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Relief pressure drop on either side of
the control valve
Correct set pressure./
Replace the relief valve.
Speed is insufficient
Low pump discharge
Pump does not work properly.
Replace or repair the pump.
Excessive pump leakage
Replace or repair the pump.
Large amount of leakage from the
hydraulic motor
Replace GM.
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Abnormal noise is produced.
From GM
Damage to the hydraulic motor or
reduction gears
Replace GM.
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From the pipe
Vibration of pipes
Clamp the pipes.
Do not switch from low speed to high speed
malfunction of the high pressure
selection check valve
Replace the control valve
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malfunction of the switching valve
Replace the 2-speed spool.
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Low pilot pressure
Set to the specified pressure
malfunction of the 2-speed switching
piston
Replace GM.
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Blockage of the passage at the
2-speed choke
Replace GM.
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Do not switch from high speed to low speed
malfunction of the switching valve
Replace the 2-speed spool.
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malfunction of the 2-speed switching
piston
Replace GM.
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