Size 80 Side-Mounted Handwheel: Disassembly; Size 80 Side-Mounted Handwheel: Assembly; Size 80 Hydraulic Snubber - Fisher 657 Sizes 80 Instruction Manual

can be mounted in either of two positions so that, re-
gardless of valve plug action, counterclockwise rota-
tion always opens the valve. The assembly is a contin-
uously connected type with an indicator to show
neutral position. By rotating handwheel away from
neutral, the handwheel can be used to limit travel in
either direction but not both directions at the same
time.
A grease fitting is provided on the gear box for periodic
gear lubrication with a general-purpose grease.
Instructions are given below for complete disassembly
and assembly. Perform the disassembly only as far as
necessary to accomplish the required maintenance;
then, begin the assembly at the appropriate step.
Key numbers refer to figure 7.
Size 80 Side-Mounted Handwheel:
Disassembly
1. Complete steps 1 through 9 of the disassembly
portion of the size 80 actuator section.
2. Unscrew cap screws (key 64), and remove adjust-
ing flange (key 36). Do not lose the key (key 47).
3. Unscrew the two screws (key 28), and remove
travel stop indicator (key 58) from lower sleeve (key
46).
4. Turn handwheel (key 51) to raise lower sleeve.
Continue turning handwheel until lower sleeve is free
of worm gear (key 44). Lift out lower sleeve, bearing
and gear retainer, thrust bearings, and worm gear
(keys 46, 66, 67, and 44).
5. The worm shaft (key 45) and associated parts can
be removed in order to replace or lubricate them. First,
remove the handwheel cap (key 54) and the hand-
wheel (key 51). Do not lose the small ball or spring
(keys 55 and 56).
6. Loosen the two set screws (key 41), and unscrew
the two worm retainers (keys 48 and 49). The ball
bearings (key 50) will come out with the retainers. Re-
move the worm shaft (key 45).
Size 80 Side-Mounted Handwheel:
Assembly
1. Pack the ball bearings (key 50) with Lubriplate
MAG-1 lubricant or equivalent, and insert one ball
bearing in the back worm retainer (key 49) as shown
in figure 7 (section C-C).
2. Thread the back worm retainer and ball bearing
(keys 49 and 50) into the gear case. Align the slot in
the worm retainer with the set screw hole in the gear
case, insert the set screw (key 41), and tighten it.
3. Coat the worm shaft (key 45) threads with Never-
Seez Nickel Special (key 244) or equivalent lubricant,
Type 657 Sizes 80 & 100
and slide the shaft into the gear case so that the end
of the shaft fits snugly in the back worm retainer.
4. Insert the bearing in the front worm retainer (key
48), and thread the retainer and ball bearing into the
gear case. Align the slot in the retainer with the set
screw hole in the gear case, insert the set screw (key
41), and tighten it.
5. Put the spring and ball (keys 56 and 55) in the
handwheel (key 51). Slide the handwheel onto the
worm shaft (key 45). Thread the handwheel cap (key
54) onto the worm shaft.
6. Pack the two thrust bearings (key 67) with Lubri-
plate MAG-1 or equivalent lubricant. Install one thrust
bearing; then, install the worm gear (key 44) followed
by the second thrust bearing and the bearing and gear
retainer (key 66).
7. The lower sleeve (key 46) has two screw holes in
one end. Coat the sleeve threads with Lubriplate
MAG-1 or equivalent lubricant, slide the end of the
lower sleeve with the holes into the thrust bearing (key
67), turn the handwheel, and feed the sleeve through
the worm gear. Continue turning the handwheel until
the lower sleeve protrudes from the gear case. Fasten
the travel stop indicator (key 58) to the sleeve with the
two machine screws (key 28).
8. Install the key (key 47) on the adjusting flange (key
36). Coat the adjusting flange threads with Never-
Seez Nickel Special (key 244). Install the adjusting
flange so that the key engages the slot in the lower
sleeve. Secure adjusting flange with cap screws (key
64).
9. Adjust set screws (key 40) to eliminate free play in
the bearings.
Over-tightening the set screws will make
handwheel operation difficult.
10. Install the adjusting screw and thrust bearings
(keys 12 and 35). Pack bearings with Lubriplate
MAG-1 (key 241) or equivalent lubricant, and install as
shown in figure 7.
11. Slide the spring case (key 29) into position, and
secure with cap screws (key 62).
12. Complete steps 3 through 8 of the size 80 actua-
tor assembly section.

Size 80 Hydraulic Snubber

The size 80 Type 657 is available with a hydraulic
snubber, as shown in figure 7, to dampen vertical in-
stability of actuator stem movement. The snubber is
adjusted by rotating the adjusting screws (key 83, fig-
ure 7) counterclockwise out of the reservoir (key 79,
figure 7) to increase damping action and clockwise to
Note
9