DeZURIK
R3 PowerRac
TM
Cylinder Actuator
August 2016
Page 9
D10359
Actuator Reassembly
(Continued)
Steps 8 through 18 apply to reassembly of the housing components. Clean and inspect all parts before
reassembly. Worn parts, especially sealing components such as O-rings, other seals, and gaskets
should be replaced. Before housing reassembly, apply a paint-like coating using one of these
lubricants:
- Keystone Zeniplex-1 (
recommended
)
- Amoco Amolith Grease #1-EP (alternate)
- Amsoil GHD (alternate)
- Mobil Mobilux EP 1 (alternate)
- Shell Alvania EP 1 (alternate)
- Texaco Multifak EP 1 (alternate)
to the following surfaces:
•
The fabric side of the rack bearing (B3) and the mating side of the rack (B5)
•
Both bearing hubs of the gear (B8)
•
The top cover O-ring (B10) and the groove in the top cover (B11)
•
Both sides of the four wedges, and the mating surfaces inside of the gear (B8)
•
The teeth in the rack (B5) and in the gear (B8)
8.
Place the rack bearing (B3) in position in the housing (B1). A dab of grease on the back side
of the rack bearing will help to hold it in place.
9.
Note the witness mark on the tooth near one end of the rack (B5). Assemble the end of the
rack opposite the witness mark to the end of the piston rod (B42) with the rack screw (B7) and
lockwasher (B6). Do not tighten the screw until step 14 below.
10.
With the four tapped holes facing upwards, place the gear (B8) into the housing bearing (B2)
so that the marked tooth on the rack (B5) meshes between the two marked teeth on the gear
as shown in Figure 3.
11.
Place the O-ring (B10) in the groove of the top cover (B11).
12.
Mount the top cover (B11) and gasket (B13) to the housing (B1) with the four screws (B15)
and washers (B14). Tighten the screws to 15 ± 2 foot pounds (20 ± 3 Nm).
13.
Place the actuator in the open position— with the piston rod (B42) extended into the
housing— before the next step.
14.
Tighten the rack screw (B7) to 216 foot pounds minimum, (293 Nm). If necessary, apply 80 psi
(550 kPa) air pressure to the cap end of the cylinder to prevent the piston rod from rotating.
15.
Turn the jam nut (B22) and the lockwasher (B23) onto the stop screw (B21), and turn the stop
screw into the center hole in the end cover (B17) until the end of the stop screw protrudes
about 1/4" (6 mm) through the end cover. Turn the jam nut finger tight.
16.
Mount the end cover (B17)— with the ‘T’ mark towards the top— and the gasket (B16) to the
housing (B1) with the four screws (B19) and washers (B18). Tighten the screws to 38 ± 5 foot
pounds (52 ± 7 Nm).
17.
Turn the adjusting screw (B29) so that the four wedges (B34) are about 1/32" (0.8 mm) from
the bottom of the pointer (B9).
18.
With the actuator in the open or closed position, place the collet assembly components into
the opening in the gear (B8), and align the pointer (B9) with the corresponding position on the
top cover (B11). Mount the pointer to the gear with the four screws (B37) and washers (B38).
Tighten the screws to 15 ± 2 foot pounds (20 ± 3 Nm).
