Type 657 Sizes 80 & 100
11
WARNING
To avoid personal injury from the pre-
compressed spring force thrusting the
upper diaphragm casing (key 1) away
from the actuator, relieve spring com-
pression (step 2, below), and carefully
remove casing cap screws (key 124)
(step 3, below).
2. Rotate handwheel counterclockwise, relieving all
spring compression.
3. Unscrew cap screws (key 124), and remove gear
case cover (key 123).
4. Loosen the set screws (key 41) in the front and
back worm retainers (keys 48 and 49) and handwheel
(key 51).
5. Remove retaining ring (key 118), and remove
handwheel.
6. Remove front and back worm retainers (keys 48
and 49).
7. Remove worm shaft (key 45).
8. Pull the power screw assembly (key 122). The
bearing and gear retainer, thrust bearing, and worm
gear (keys 66, 67 and 44) will come out with the power
screw.
Size 100 Top-Mounted Handwheel:
Assembly
1. Pack the ball bearings (key 50) with Lubriplate
MAG-1 (key 241) or equivalent lubricant, and insert
one ball bearing into the back worm retainer (key 49).
2. Thread the back worm retainer and ball bearing
into the gear case. Align the slot in the worm retainer
with the set screw hole in the gear case, insert set
screw (key 41), and tighten.
3. Coat the worm shaft (key 45) threads with Lubri-
plate MAG-1 or equivalent lubricant, 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 into 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 hole in
the gear case, insert the set screw (key 41), and tight-
en.
5. Slide the handwheel onto the worm shaft (key 45),
and install retaining ring (key 118).
6. Pack the two thrust bearings (key 67) with Lubri-
plate MAG-1 or equivalent lubricant. Install one thrust
bearing, then the worm gear (key 44), followed by the
second thrust bearing and the bearing and gear retain-
er (key 66).
7. Coat the power screw threads (key 122) with Lubri-
plate MAG-1 or equivalent lubricant. Slide the power
screw into the thrust bearing (key 67), turn the hand-
wheel, and feed the sleeve through the worm gear.
8. Adjust set screws (key 40) to eliminate free play in
the bearings.
Note
Over-tightening the set screws will make
handwheel operation difficult.
9. Install gear case cover (key 123), and tighten cap
screws (key 124).
Each actuator has a serial number stamped on the
nameplate. Always refer to this number when corre-
sponding with your Fisher Controls sales office or
sales representative regarding replacement parts or
technical information. Also, always refer to the
11-character part number of each needed part as
found in the following parts list.
Type 657 Sizes 80 & 100
Key
Description
Part Number
1
Upper Diaphragm Casing
Size 80
Cast Iron
Std
0W072519012
For top-mtd Handwheel
3A355919012
Steel
3L449122012
Size 100
Aluminum
40A2599X012
2*
Diaphragm
Size 80
Nitrile
1R6375X0072
Silicone
1R6375X0012
Size 100, nitrile & Dacron
20A2551X012
3
Cap Screw, pl steel
Size 80
1L467132982
4
Diaphragm Plate
Size 80
Cast Iron
3L467019042
Steel
3L447922012
Size 100
Aluminum
20A2560X012
5
Lower Diaphragm Casing
Size 80
Cast Iron
0W072719012
Steel
3L448722012
Size 100 W/group 2 springs, alum.
40A2600X012
*Recommended spare parts