Bettis P/N 137462E
Revision
"A”
Page 14 of 18
3.3.20.2 Install caution tag (12-40) onto M3 jackscrews (4-30) and (6-30).
3.3.20.3 Install retainer ring (12-30) and groove pin (12-20) into the hex drive hub (12-10)
or handwheel (12-10).
3.3.21 Adjust both M3 jackscrews (4-30) and (6-30) back to setting recorded in Section 2 step
2.1.2 under General Disassembly. Tighten both M3 jackscrew hex nuts (4-40) and (6-
40) securely, while holding M3 jackscrews in position.
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:
Pressure is not to exceed the maximum operating pressure rating listed
on the serial number 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 both sides
of the piston. Repeat this cycle approximately five 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 adapter 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 Cylinder to housing joint on CBA730 or cylinder to cylinder adapter to housing
joints on CBA830, CBA930 and CBA1030 actuator models.
4.1.6.2 On the outboard end of housing adapter (6-10) at the center bar hex nut.
Checks the center bar to housing o-ring seal (5-20).
4.1.6.3 Housing adapter stop screw / ES / M3 jackscrew o-ring seal (7-30).
4.1.6.4 Torque shaft (1-30) to housing (1-10) interface. Checks rod wiper seals (2-20).
