Flowserve 10 ACCESS I 39 Actuators - Manual (Page 12)

12 10, 15, 20 ACCESS I 39 Actuators WCAIM2027
ACTUATOR REASSEMBLY
1. Be sure the actuator surfaces are clean and free of grit and
scratches. If the inside walls of the body are scored, or the guide
rod surfaces are scratched, the actuator will leak after rebuilding.
New parts should be obtained from the factory. Light tracking,
barely detectable to touch, is acceptable.
2. All rebuilding kit O-rings and bearings may now be installed.
Lubricate the standard actuator thoroughly with a #1 grease.
Apply a light film of grease to all O-rings. (Note that kits also
contain some parts for earlier revisions of actuators that will not
be needed.)
3. Replace the two split ring style bearings (6A) and one guide rod
O-ring (15B) in each end cap.
Replace the split ring style bearing (6B) and guide rod O-ring(s)
(15B) into ID groove(s) in each piston (3). Install O-rings (15C)
onto pistons.
4. Replace O-ring (15E) and bearing (15H) on the bottom of shaft.
On the top of the shaft add the two stainless steel washers with
the throughst bearing (10) between them. Locate the top bearing
(15G) and O-ring (15D) into the body. NOTE: For Rev. R6
actuators, top bearing (15G) is flat, the same as and
interchangeable with throughst bearing (10). Replace the shaft
through the larger opening in the bottom of the body.
5. Very carefully align the piston guide rod assemblies inside the
body. Keep the pistons square to the body.
IMPORTANT: One piston guide rod assembly has a through hole
drilled in it. It can be easily located by looking down the ends of
both guide rods. This piston assembly must be reassembled,
with its respective guide rod, opposite the nameplate on the
body, as it was removed.
6. Align the shaft so that the teeth on the shaft will “pick-up” the
piston assembly’s rack teeth when turning the top extension of
the shaft clockwise (CW). See Figure 3.
IMPORTANT: Proper 90° rotation can only be ensured if the shaft
teeth begin to mesh with the piston assembly’s teeth at the
“proper tooth” between these meshing gear pairs. See Figure 3.
IMPORTANT: Note the relative location of the shaft teeth and the
piston assembly’s rack teeth. Figure 3 is viewed when looking at
the top of the actuator.
7. To ensure proper meshing of teeth, move the shaft 15 to 20
degrees counterclockwise (CCW) from its normal position when
the piston assemblies are located at the body ends. NOTE: The
“normal position” of the shaft is when the top flats are parallel to
the main axis of the actuator body.
8. With the piston assemblies in the body, gently push each piston
into the body. Turn the top shaft extension clockwise (CW). Do
not allow the pistons to “cock.”
At the proper point of engagement between the shaft and piston
assemblies, both piston assemblies will move toward the center
of the body when turning the top shaft extension of the actuator
clockwise (CW).
9. Once the shaft and pistons are properly engaged, ensure that
smooth movement and full-closed operation can occur without
moving the pistons out of the actuator body. This is important!
10. Install O-ring (15A) into and replace the actuator end caps, (5A
and 5B), noting that the “foolproof” pin between the body and end
cap mates properly. For spring-return actuators, see spring
installation section on page 12 before installing end caps.
NOTE: When installing the end cap O-rings, use a small amount
of a general purpose lubricant, such as petroleum jelly, to hold
them in place for ease of assembly and to avoid having them
fall and get pinched.
11. Replace the stainless steel washer over the top shaft extension.
12. VERY IMPORTANT: Install the NEW shaft clip (15F) into its mating
groove on the top shaft extension. The removed shaft clip is not
to be reused.
Place the numbered side up on the shaft clip and be certain the
clip is fully seated in its groove. See Note in paragraph 7 of
Actuator Disassembly for installation of spiral ring type shaft clip,
which newer rebuilding kits will contain.
13. If control block (7A) or air connection block (7B) was removed:
Properly insert appropriate gasket (9A, 9B or 9C) between control
block or air connection block and end cap (see Figure 2 on page 8
and actuator exploded view), and attach block securely to end
cap. See note in disassembly paragraph 4 on page 10. Do not
apply any grease to gasket, it must be installed dry.
14. Replace position indicator (17), if any. See Section D.8 in
Installation Section for proper installation and to determine
position indication.
15. Mark Rebuild/Accessory Addition Label, if included in repair kit,
and apply to actuator.
Flow Control Division
Worcester Controls
Figure 3
DOUBLE-ACTING ACTUATOR
PISTONS AT END OF BODY
NAMEPLATE