Flowserve Handwheels and Limit Stop - Manual (Page 10)

5-10 Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
2. Keep the handwheel mechanism free from dirt. If
dirt begins to impair handwheel operation, disas-
semble and clean thoroughly.
Disassembly
To disassemble the declutchable handwheel on rotary
actuators, refer to Figure 5:
1. It is not necessary to remove the valve from line to
disassemble handwheel, although it is important to
repressurize the line to atmospheric pressure.
WARNING: Failure to repressurize the line and
actuator to atmospheric pressure could result
in serious personal injury.
2. Remove the four cover-plate bolts and slide the
handwheel assembly off the transfer case and
shaft.
3. Remove the two sockethead screws holding the
clutch indicator to the coupling and remove the
cover plate from the assembly.
4. If disassembly of clutch assembly is necessary,
remove large external retaining ring (use snap-ring
pliers) located on the clutch shaft by the clutch
handle. Slide the clutch handle and clutch indicator
off the shaft. Remove clutch shaft from the cover
plate and slide compression spring off of the shaft.
Remove the small external retaining ring and the
clutch key from the shaft.
5. If it is necessary to remove the handwheel from the
handwheel stem, remove the handwheel lock nut
and slide the handwheel and handwheel key off the
handwheel stem.
NOTE: All stems use either an external retaining
ring or a shoulder on the stem to hold the handwheel
in place. The retaining ring does not require removal
except for replacement.
6. Drive the stem pin through the stem and worm gear
until it nearly touches the housing wall. Rotate the
stem 180
°
and pull out the pin with a pair of vice
grips or similar tool.
7. Slide the stem out of the assembly. Simultaneously
slide the handwheel gear off the coupling and
remove the worm. Remove the two sets of thrust
rollers and races. The two stem bearings should be
visually inspected for damage or wear. If removal of
the stem bushings is necessary, push them out
using a dowel of the same diameter and a suitable
press.
8. Pull the coupling out of the housing. Inspect the
flanged bushing for wear. If necessary, remove with
an appropriate press and dowel.
Reassembly
To reassemble the declutchable handwheel on rotary
actuators, refer to Figure 5:
1. Clean all parts thoroughly before reassembling the
declutchable handwheel.
2. To reassemble the clutch assembly (if disas-
sembled), slide the clutch key onto the small end of
the clutch shaft and secure with the small external
retaining ring. Install the compression spring over
the shaft. Position the clutch indicator on the out-
side of the cover plate. Slide the large end of the
clutch shaft through the clutch indicator from the
inside of the cover. Install the clutch handle and
large external retaining ring.
3. Using a press, install new stem bushings (if removed).
4. Using a press, install a new flanged bushing (if
removed). Lubricate and reinstall the coupling. Note
that the coupling rotates inside the flanged bushing.
5. Thoroughly lubricate the worm and handwheel gear.
Holding the worm engaged in the gear (as shown in
Figure 5), slide the handwheel gear onto the
coupling.
6. Install a thrust bearing at each end of worm, making
sure roller is sandwiched between the two races.
7. Slide the handwheel stem through the stem bear-
ings and worm gear. Align pin holes in the worm
gear and stem, and drive pin into place.
8. If the handwheel was removed from the stem, insert
the handwheel key into its slot in the handwheel
stem. Slide the handwheel on and secure it with the
handwheel locknut.
9. Pack the entire inside volume of the handwheel
housing with a multi-purpose grease.
10. Rotate the coupling until its slot aligns with the slot
in the handwheel gear. Replace the cover plate,
making sure the clutch key slides into the slots.
Rotate the clutch handle until it fits into the bottom
of the deep slot in the indicator and allows the clutch
key to engage the gear and coupling. If the key does
not engage, rotate the handwheel back and forth
until it does. Rotate the clutch indicator until the two
screw holes line up and the pointer points to the
stroke indicator scale. Fasten in place with the two
screws.
CAUTION: Since the gear has limited rotation,
the splines on the shaft and coupling must be
correctly oriented. Incorrect alignment will re-
sult in limited handwheel rotation.
11. To correctly orient the splined shaft and coupling,
check to see if the valve is open or closed. If closed,
rotate the handwheel clockwise with the clutch
engaged until the gear hits the stop. Next, slide the
handwheel assembly onto the splined shaft, mak-
ing sure the line on the end of the shaft lines up
exactly with the closest line on the coupling. Rein-
stall the four cover plate bolts.
12. If the handwheel does not stroke the valve fully, the
splined shaft and coupling are not aligned correctly.
Repeat Step 11.