Disassembly; Assembly; Parts Ordering; Parts Kits - Emerson Fisher Type 667 size 80 Instruction Manuals

Type 667 Sizes 80 & 100
Instructions are given below for complete disassembly
and assembly. Disassemble only as far as necessary
to accomplish the required maintenance; then, begin
the assembly at the appropriate step.

Disassembly

1. Isolate the control valve from the line pressure, re-
lease pressure from both sides of the valve body, and
drain the process media from both sides of the valve.
If using a power actuator, also shut-off all pressure
lines to the power actuator, release all pressure from
the actuator. Use lock-out procedures to be sure that
the above measures stay in effect while you work on
the equipment.
2. Bypass the control valve. Reduce the loading pres-
sure to atmospheric (refer to the Maintenance sec-
tion), and remove the tubing or piping from the dia-
phragm casing.
3. Unscrew cap screws (key 54), and remove gear
case cover (key 53).
4. Loosen the set screws (key 52) in the front and
back worm retainers (keys 48 and 49) and handwheel
(key 58).
5. Remove retaining ring (key 60), and remove hand-
wheel.
6. Remove front and back worm retainers (keys 48
and 49) and bearings (key 50).
7. Remove worm shaft (key 51).
8. Remove the power screw assembly (key 46) by
placing a wrench on the double hex nuts (key 47) and
unscrew the assembly from the actuator stem exten-
sion (key 36). The bearing and gear retainer, thrust
bearing, and worm gear (keys 45, 43, and 44) will
come out with the power screw.

Assembly

1. The front and back worm retainers (keys 48 and
49) each have a slot in their threads for a set screw
(key 52). Pack the ball bearings (key 50) with Lubri-
plate MAG-1 or equivalent, and insert one ball bearing
into the back worm retainer (key 48).
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 52), and tighten.
3. Coat the worm shaft (key 51) threads with Lubri-
plate MAG-1 or equivalent lubricant, and slide the
16
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
49), 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 52), and tighten.
5. Slide the handwheel onto the worm shaft (key 51),
and install retaining ring (key 60).
6. Pack the two thrust bearings (key 43) 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 45).
7. Coat the power screw threads (key 46) with Lubri-
plate MAG-1 or equivalent lubricant. Slide the power
screw into the thrust bearing (key 43), turn the hand-
wheel, and feed the sleeve through the worm gear.
8. Install gear case cover (key 53), and tighten cap
screws (key 54).
9. Adjust set screws (key 55) to eliminate free play in
the bearings.
Overtightening the set screws (key 55)
will make the handwheel difficult to op-
eration.
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 as found in
the following parts list.
Actuator Repair Kit
Parts kit includes keys 8, 9, and 70.
Key Description
Size 80
Note
Part Number
R667X000802