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5. Spread clamping rings slightly, just enough to slip rings
off plates, It may be necessary to use a soft mallet to
break the clamping rings loose. If clamping rings are to
be reused, caution should be taken so they are not
distorted.
6. Remove auxiliary pressure plate, auxiliary diaphragm,
service pressure plate, service diaphragm (with
separator, if present). On SD-3
and service diaphragm only.
7. Place non-pressure plate assembly on a smooth surface
with the push plate down.
8. Connect an air supply (shop air) line to the locking port.
Push down on the actuator non-pressure plate;
maintaining air pressure at the locking port. As the shaft
is unlocked (released), ease the non-pressure plate back
and remove the push plate and shaft assembly with push
rod and return spring.
9. While holding cap assembly down against roller spring
tension, completely remove four (4) machine screws,
release cap assembly, and remove.
10. Remove retainer from cap by turning in clockwise
direction until tabs of retainer line up with slots in cap.
Remove retainer spring and seal. Remove inner and
outer cap o-rings.
11. Remove roller spring (G), spring seat washer, and eight
(8) rollers (F) (Fig. 3).
12. Remove collar (E), piston (C), and piston o-ring. NOTE:
If necessary, apply air cautiously at the lock port to assist
in removal of the above parts.
13. Remove rear retaining spring by dislodging from groove
of plate and remove rear seal.
14. Inspect bearing in shaft bore on non-pressure plate,
and remove only if it shows signs of wear and is to be
replaced. The push rod should not be removed from
the shaft unless it is damaged and requires replacement.
To remove rod, place a heavy washer over the rod
against the shaft; position a spacer (short length of pipe)
and a second washer over the rod (and on top of the
spacer). Install yoke lock nut(s) and turn down with a
long-handled wrench, pulling the push rod from the shaft.
15. Remove exhaust check valve from non-pressure plate.
16. The studs in the non-pressure plate may be removed
and replaced if necessary.
CLEANING AND INSPECTION
1. Wash all metal parts in a good cleaning solvent and dry
thoroughly. It is generally recommended that all rubber
parts be replaced; however, any rubber parts that are
to be reused should be wiped dry.
2. Discard felt breather.
3. Inspect all parts for excessive wear or deterioration.
Particular attention should be given to the piston and
4
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actuators, pressure plate
collar bores in the non- pressure plate. The air passage
from the lock port to piston bore should be checked for
restriction and cleaned; if necessary, remove the
inspection plug to thoroughly clean this passage.
4. Rollers should be carefully checked, and all rollers
replaced if one or more need replacing.
5. Check springs for cracks, distortion, or corrosion.
6. Replace all parts not considered serviceable during
these inspections.
ASSEMBLY
1. Line up parts as they were marked prior to assembly.
2. If the bearing in the non-pressure plate was removed, it
should be re-installed or replaced if necessary.
3. Lubricate piston and collar bores, shaft, piston o-ring,
piston and roller cavity liberally with "Never Seez"
lubricant (BW 404-M).
4. Position piston o-ring in piston bore, then piston with
smooth end down against o-ring.
5. Place collar in its bore (chamfer side down).
6. Coat rollers thoroughly and liberally with "Never Seez"
lubricant (BW 404-M) and place eight (8) rollers in
grooves formed by top of piston and collar ramp.
7. Pack roller cavity liberally with "Never Seez" lubricant
(BW 404-M).
8. Place roller spring seat washer on top of rollers.
9. Position cone-shaped roller spring on washer with
smaller end to washer.
10. Install o-rings in cap: small o-ring in inner bore, large
o-ring on outside of cap, making certain o-rings are
properly seated in grooves.
11. Place seal in bore of cap. Lip of seal should face front
of cap. Place retainer spring on seal, position retainer
on spring, compress spring, line up tabs on retainer to
slots on cap, and lock retainer on cap by turning 1/4
turn counterclockwise.
12. Position cap on roller spring. DRAIN HOLE IN CAP
SHOULD BE POSITIONED SO IT LINES UP WITH
DRAIN AREA of non-pressure plate. Press cap down
and hold while installing four (4) machine screws evenly
and securely. Install new felt breather.
13. Turn over non-pressure plate assembly and install rear
seal. Lip of seal faces non-pressure cavity. Install spring
retainer, making certain it is retained in groove of non-
pressure plate.
14. Install push plate return spring (larger end down).
15. Position push plate and shaft over return spring and
press down so shaft moves through lock. The lock should
hold shaft position against return spring. If not, check
previous assembly procedure.
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