May 2012
Service Instructions
137465E Rev. F
15
Section 4: Actuator Testing
Actuator Testing
Section 4: Actuator Testing
4�1 Actuator testing
4.1.1 Leak Test - General - A small amount of leakage may be tolerated. Generally, a
small bubble which breaks about three seconds after starting to form is considered
acceptable.
4.1.2 All areas, where leakage to atmosphere may occur, are to be checked using a
commercial leak testing solution.
WARNING: MAXIMUM OPERATING PRESSURE
Pressure is not to exceed the maximum operating pressure rating listed on the serial num-
ber tag (20).
4.1.3 All leak testing will use the customer normal operating pressure or the actuator
name tag normal operating pressure (NOP).
NOTE:
When testing the actuator use a proper adjusted regulator to apply pressure to the actuator.
4.1.4 Before testing for leaks, apply and release the pressure listed in step 4.1.3 to the
housing side of the piston. Repeat this cycle approximately ve times. This will
allow the new seals to seek their service condition.
4.1.5 Apply the pressure listed in step 4.1.3 to the housing side of the piston and allow
the actuator to stabilize.
4.1.6 Apply a leak testing solution to the following areas:
4.1.6.1 Spring cylinder to housing joint on CBB315-SR, CBB420-SR, and CBB525-
SR or spring cylinder to cylinder adapter to housing joints on CBB415-SR,
CBB520-SR, and CBB725-SR actuators.
4.1.6.2 On the out board end of housing (1-10) at the center bar assembly nut.
Checks the center bar to housing o-ring seal (5-20).
4.1.6.3 Housing stop screw O-ring seal (2-30).
4.1.6.4 Torque shaft (1-30) to housing (1-10) interface. Check rod wiper seals (2-20).
4.1.6.5 End cap (4-20) port hole. Check the piston to cylinder seal (5-40) and
piston to center bar seal (5-20).
4.1.6.6 Remove pressure from pressure inlet port in the housing (1-10).
4.1.7 If an actuator was disassembled and repaired as a result of this procedure, the
above leakage test must be performed again.
4.1.8 Operational (Functional) Test: This test is used to verify proper function of the actuator.
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