Flowserve Valtek Spring Cylinder Rotary Actuators - Manual (Page 4)

WARNING: Spring is under compression. Failure
to relieve spring compression by removing
adjusting screw can result in serious personal
injury.
3. Using a screwdriver, remove the retaining ring from
the groove at the base of the cylinder.
4. Pull the cylinder off the transfer case and piston.
NOTE: Substantial O-ring resistance may be felt.
WARNING: Do not use air pressure to remove
cylinder. Personal injury may result.
5. Remove spring button and spring.
CAUTION: Care must be taken not to damage the
sliding seal assembly or actuator stem O-ring
when removing the actuator stem.
6. Remove the actuator stem locknut. The piston and
piston stem O-ring may now be removed from the
actuator stem.
7. Remove the spiral snap-ring holding the sliding
seal assembly in place.
8. Remove the retaining washer and sliding seal
collar. These components can usually be removed
by hand or by gently prying the outside surface of
the collar upward.
WARNING: Do not scratch the bottom surface
of the sliding seal collar with a screwdriver or
sharp object. Scratches can cause excessive
wear and possible leakage.
9. Remove the transfer case cover plate by removing
the four bolts.
10. Remove the yoke from the transfer case by removing
the four lug bolts.
11. Remove the pivot pin from the non-clamping lever
arm by removing a retaining ring.
12. The actuator stem can now be easily removed from
the transfer case.
13. The non-clamping lever arm can be removed by first
removing the positioner according to the appropriate
positioner maintenance bulletin.
14. If the yoke/cover plate bearings need to be
replaced, press them out of the yoke and/or cover
plate using a press and arbor.
15. The non-clamping lever arm bearings can be
replaced by pressing them out with a press and
arbor.
ACTUATOR REASSEMBLY
Reassembling Actuators with clamping
and Non-clamping Lever Arm
To reassemble an actuator with a non-clamping lever
arm, refer to Figures 1 and 2, and proceed as follows:
1. Clean and lubricate all internal parts. All O-rings
should be replaced and lubricated using a silicone
lubricant (Dow Corning 55M or equivalent). The
bore that houses the sliding seal assembly in the
transfer case must be smooth and clean.
2. If lever arm bearings were removed, install new
bearings by pressing them into place with a press
and arbor.
3. Install lever arm into transfer case through cover
plate/yoke openings.
4. Slide actuator stem through the top opening of
transfer case and connect to the lever arm with
the pivot pin and two retaining rings.
5. If the yoke/cover plate bearings were removed,
press new bearings into the yoke and cover plate
using a press and arbor.
6. On clamping lever design, firmly tighten clamp bolt
on clamping lever arm actuators.
7. Install cover plate and yoke onto transfer case. The
four tapered lug bolts are used with the yoke and
standard hex bolts are used with the cover plate.
8. Install base slider O-ring into sliding seal groove
machined in the transfer case.
9. Install actuator stem O-ring into the sliding seal
collar. Then slide the collar over the actuator stem.
10. Place retaining washer over the collar and install
the spiral retaining ring into the transfer case.
11. Replace the piston O-ring and piston backup ring
onto piston, making certain the piston backup ring
is on top (toward the top of cylinder) of the piston
O-ring.
NOTE: 200 square-inch actuators use two piston
backup rings. They are placed on each side of the
piston O-ring.
12. Install the piston stem O-ring and piston on to the
actuator stem.
13. Install the spring guide (50, 100, and 200 square-
inch actuators only) and actuator stem locknut
onto the actuator stem. Tighten the actuator stem
locknut firmly.
14. Install the cylinder O-ring into transfer case groove.
NOTE: Replace cylinder O-ring if damaged.
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