Reassembly
9.3
Reassembly of the pistons
NOTICE
Before reassembling the pistons, check the required assembly code (see section 4.2).
1.
Grease the piston parts according to step 9.1.
2.
Install the piston rack bearing strips (17) and piston O-ring seals (16) on the pis-
tons (14). Ensure all these parts are kept in place during assembly.
Figure 28
Reassemble the pistons
17
14
16
16
17
14
15
15
3.
Align the pinion (see Figure 26) so that the teeth on the pinion will pick up the
pistons rack teeth when turning the pinion. The position of the pinion top slot and
the cam on the pinion top:
—
For standard or Spring-to-Close: Assembly Code CW.
—
For reverse or Spring-to-Open: Assembly Code CC.
4.
Slightly push the pinion inward to engage with the pinion.
—
Ensure that smooth movement and 90-degree operation can occur with-
out moving the pistons out of the actuator body.
—
For larger pistons, use a rubber mallet and slightly hitting the pistons
inward to engage with the pinion.
5.
When the pistons are moved 90° inwards (see figure 26), check that the pinion slot
on the pinion top is:
—
Perpendicular to the length centre line of the house for assembly code CW.
—
In line to the length centre line of the house for assembly code CC.
6.
If not, turn pinion to move the pistons outward until they disengage from the
pinion. Shift one tooth of the pinion, reassemble and check again.
7.
Move the pistons outward so that just the bearing groove sticks out of the hous-
ing. Fold the piston bearings (15) around the piston and hold the bearing ends in
place while moving the pistons inwards.
—
For larger pistons, use a rubber mallet and slightly hitting the pistons
inward to engage with the pinion.
Installation, Operation and Maintenance Manual
DOC.IOM.EF.EN Rev. 7
September 2017
37
Section 9: Reassembly
