FAULT DETECTION
Page 8 of 12
INSTALLATION AND MAINTENANCE
GP RANGE
CAUSE
6.1.1 Irregular supply of operating
medium.
6.1.2 Inadequate lubrication.
6.1.3 Worn parts.
6.1.4 Defective valve.
6.2.1 Incorrectly set stops
(valve and /or actuator).
6.2.2 Hardened grease.
6.2.3 Debris left in the cylinder or
housing during maintenance.
6.2.4 Defective valve.
6.3.1 Inadequate supply pressure.
6.3.2 Incorrect speed control settings.
6.3.3 Exhaust port blocked.
6.3.4 Pipe work blocked, crushed
or leaking.
6.3.5 Defective controls.
6.3.6 Defective piston seal.
6.3.7 Defective rod seal.
6.3.8 High valve torque or valve seized.
SYMPTOM
6.1 Erratic movement
6.2 Short stroke
6.3 Apparent lack of power
REMEDY
6.1.1.1 Check operating medium for consistent
supply pressure and correct as necessary.
6.1.2.1 Dismantle, re-lubricate and reassemble.
6.1.3.1 Dismantle. Visually inspect for significant
wear. Actuator replacement may be required.
6.1.4.1 Consult the valve manufacturer's
documentation.
6.2.1.1 Check the position of the travel stops and
readjust as necessary.
6.2.2.1 Dismantle, remove any hard grease,
re-lubricate and reassemble.
6.2.3.1 Disassemble cylinder assembly to remove
debris. Reassemble cylinder assemble as
necessary.
6.2.4.1 Consult the valve manufacturer's
documentation.
6.3.1.1 Ensure supply pressure is above the minimum
operating pressure of the actuator and that
output torque produced at supply pressure
exceeds valve torque demand.
6.3.2.1 Adjust speed controls to increase flow.
6.3.3.1 Remove and clean the exhaust port
silencers and replace.
6.3.4.1 Examine the pipe work for blockages,
crushed pipe or leakage. Clear or replace
as necessary.
6.3.5.1 Examine the controls, refurbish or renew
as necessary. Refer to component
manufacturer's documentation.
6.3.6.1 Dismantle the cylinder assembly, remove
the defective piston seal. Fit new seal and
reassemble.
6.3.7.1 Dismantle the cylinder assembly, remove
the defective rod seal. Fit new seal and
reassemble.
6.3.8.1 Consult the valve manufacturers
documentation.
6.0 Fault Detection
In the unlikely event of a fault developing, the following Fault Location Table is provided to assist the maintenance technician.
This table is designed to cover as wide a range of Rotork Fluid Systems actuators as possible. Reference to equipment not
supplied should be ignored.
Publication F130E
Date of issue 04/08
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