HYDRAULIC UNITS
SLEW MOTOR
IV-150TB53FR
Anit-rebound Valve
The motor does not
rotate or its rota-
tion speed is slow.
Symptom Probable Causes
Something other than the piston motor, valve
unit or anti-rebound valve is malfunctioning.
Inspect the pressure at the entrance of the
valve. Or, inspect individual units and ser-
vice as necessary.
Remedy
The check valve assembly is not seated prop-
erly.
• Foreign matter is trapped.
• The tightening torque of the anti-rebound
valve mounting bolt exceeds the prescribed
value.
• Remove the foreign matter. Repair or
replace the faulty parts.
• Use the prescribed tightening torque.
The sleeve is malfunctioning.
• Foreign matter is trapped. • Remove the foreign matter. Repair or
replace the faulty parts.
The motor does not
stop or its stopping
speed is slow.
The check valve assembly is not seated prop-
erly.
• Foreign matter is trapped.
• The tightening torque of the anti-rebound
valve mounting bolt exceeds the prescribed
value.
• Remove the foreign matter. Repair or
replace the faulty parts.
• Use the prescribed tightening torque.
The valve within the check valve assembly is
malfunctioning.
• Foreign matter is trapped.
• Foreign matter is in the orifice of the valve.
• Remove the foreign matter. Repair or
replace the faulty parts.
• Remove the foreign matter.
The sleeve is malfunctioning.
• Foreign matter is trapped. • Remove the foreign matter. Repair or
replace the faulty parts.
The valve within the check valve assembly is
malfunctioning.
• Foreign matter is trapped.
• Foreign matter is in the orifice of the valve.
• Remove the foreign matter. Repair or
replace the faulty parts.
• Remove the foreign matter.
Slewing stops with
a great shock.
The orifice is choked.
• Foreign matter is in the orifice of the anti-
rebound valve body.
• Foreign matter is in the orifice of the valve
unit.
• Remove the foreign matter.
• Remove the foreign matter.
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