Reassembly
9.3
Reassembly of the Pistons
NOTICE
Before reassembling the pistons, check the required assembly code (see Section 4.4).
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
pistons (14). Ensure all these parts are kept in place during assembly.
Figure 33
Reassemble the Pistons
17
14
16
16
17
14
15
15
3.
Before aligning the pinion and pistons, verify the actuator size and the location
of the limit stop screws (D), see Figure 34. Align the pinion so that the teeth on
the pinion will pick up the pistons rack teeth when turning the pinion. Note 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 34), 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
housing. 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.
44
April 2019
Installation, Operation and Maintenance Manual
DOC.IOM.BQ.E Rev. 3
Section 9: Reassembly
