Assembly; Installing The Pinion - Fisher 1032 Instruction Manual

ly, turn the nut, located on the retractor rod and
against the end cap, clockwise until the end cap
turns freely. Perform the same step on both end
caps.
f. Loosen the nut on the safety key (key 5, figure
11), and unscrew the threaded portion.
g. Remove the flexible stainless steel key (key 5,
figure 11) by gently pulling on the nut and at the
same time turning the end cap toward the safety
key. For larger models, use a wrench on the end
cap boss to assist in turning the end cap.
4. When both flexible stainless steel keys have been
removed, place a wrench on the top of the pinion, and
rotate the pinion (key 2) to push the end caps (key 4)
partially out of the body (key 1). Remove the end caps
by pulling them straight out from the body.
5. Inspect the end cap O-rings (key 13). If it is neces-
sary to remove them, use a flat-bladed screwdriver or
similar tool to roll the O-rings out of their groove in the
end caps.
6. Place a wrench on top of the pinion, and rotate the
pinion (key 2) so that rack teeth on the pistons (key 3)
no longer engage the pinion. Pull the pistons straight
out from body (key 1).
7. Inspect the piston O-rings (key 12). If it is neces-
sary to remove them, use a flat-bladed screwdriver to
roll the O-rings out of their groove in the piston.
8. Inspect the piston bearings (key 16). If it is neces-
sary to remove them, use a flat-bladed screwdriver
under one end of the bearing to pry the bearings out of
their holding grooves in the piston.
9. Using a snap ring tool, remove the snap ring (key
23) from the pinion (key 2).
10. Remove the thrust washer (key 20) and thrust
bearing (key 19) from the top of the pinion.
11. Back out and remove the travel stop adjustment
bolts (key 9). The travel stop lock nuts and sealing
washers (keys 10 and 11) will come off with the travel
stop adjustment bolts. Push the pinion and associated
parts out the bottom of the body (key 1).
12. Inspect the O-rings (keys 17 and 18), thrust bear-
ings (key 19), and upper and lower pinion bearings
(keys 14 and 15) and replace as necessary.
a. If the upper and lower pinion bearings (keys 14
and 15) must be replaced, either raise the upper
thrust bearing (key 19) and the thrust washer (key
20) against the O-ring (key 18) to provide sufficient
space to remove the upper pinion bearing or re-
move the O-ring, thrust bearing, and thrust washer
from the pinion.
A5834 / IL
Figure 8. Pinion Orientation and Piston Installation
for Counterclockwise Output Rotation
b. Remove the upper and lower pinion bearings
(keys 14 and 15) by placing a small-bladed screw-
driver or other similar tool under the edge of one
end of each bearing and remove it.

Assembly

This procedure assumes that the actuator was com-
pletely disassembled except for the end caps in the
spring-return models. It is assumed that the retractor
rods were not removed from the end caps when the
end caps were removed from the actuator. If the ac-
tuator was not completely disassembled, start the as-
sembly instructions at the appropriate step. Assembly
procedures are identical for both double-acting and
spring-return actuators except for assembly of the end
caps.

Installing the Pinion

Key numbers are shown in figures 10 and figure 11
unless otherwise indicated.
1. Apply a light coat of lithium-based grease to upper
and lower pinion bearing slots and to the pinion O-ring
grooves.
2. New upper and lower pinion bearings (keys 14 and
15) are received flat. Using care to avoid breaking the
new pinion bearings, form them around the pinion, and
install them into their respective slots in the pinion.
3. Install the thrust washer (key 20) and the thrust
bearing (key 19) over the upper pinion bearing (key
14).
4. Coat O-rings (keys 17 and 18) with a lithium-based
grease, and then install them in their respective
grooves in the pinion.
5. Apply a light coat of lithium-based grease to the
pinion (key 2) and to the pinion bores of the body (key
1). Make certain that the newly installed upper and
lower pinion bearings are coated.
Type 1032
7