Installation, Operation and Maintenance Manual
VA-DC-000-1878 Rev. 0
December 2020
29
Section 3: Actuator Reassembly
Actuator Reassembly
3.6.15
Install O-ring seal (8 - 70) into the O-ring groove located on the inner diameter of
the hydraulic cylinder assembly flange opening.
3.6.16
Install the outer end cap (7 - 70) assembled piston rod (7 - 20) with piston (7 - 50)
onto the open end of the hydraulic cylinder assembly and over the vent
tube (7 - 60).
3.6.17
Install lock washers (7-90) onto hex cap screws (7-80).
3.6.18
Install and tighten hex cap screws (7-80), with lock washers (7-90) through outer
end cap (7-70) and into hydraulic cylinder assembly.
NOTE:
For M18 Hydraulic Override Cylinder installations refer to Section 5, step 5.2.
1.1
Actuator Testing
3.6.19
Leakage Test - All areas where leakage to atmosphere may occur are to be
checked, using a commercial leak testing solution.
!
CAUTION
Do not exceed maximum pressure. Pressure applied to the actuator is not to exceed the
maximum operating pressure rating listed on the actuator name tag. Test the actuator
using a properly adjusted self-relieving regulator, with gauge.
3.6.20
Cycle the actuator five times at the maximum operating pressure (MOP) as listed
on the actuator’s name tag or the customer's normal actuator supply pressure. If
excessive leakage across the piston is noted, generally a bubble which breaks three
seconds or less after starting to form, cycle the actuator five times as this will allow
the seals to seek their proper service condition.
NOTE:
If excessive leakage across the piston remains, the actuator must be disassembled, and the
cause of leakage must be determined and corrected.
3.6.21
Apply MOP pressure to the pressure port in inner end cap (3 - 10) and allow the
actuator to stabilize.
3.6.22
Apply a commercial leak testing solution to the following areas:
3.6.22.1
Joint between inner end cap (3 - 10) and cylinder (3 - 70). This checks
cylinder to inner end cap O-ring seal.
3.6.22.2
The port hole in the outer end cap (3 - 80). This checks the piston D-seal
to cylinder (3 - 70), O-ring seal (4 - 70), and rod T-seal (4 - 50).
