Emerson Process Management 667 - Manual (Page 20)

Instruction Manual
D100311X012
667 Size 80 and 100 Actuators
May 2011
20
24. Once completed, no more tightening is recommended.
25. For actuators with a top‐mounted handwheel (see figure 9), mount the gear case assembly (key 41) on the
actuator using cap screws (key 16). Install the hex nuts (key 47) and travel stop cap screw (if used) on the actuator
stem extension (key 36). Install the gear case cover (key 53) with cap screws (key 54).
26. Mount the actuator on the valve, and secure with the actuator‐to‐bonnet bolting. Refer to the Installation section
to connect the actuator stem to the valve plug stem.
Size 80 Side‐Mounted Handwheel
The side‐mounted handwheel assembly (figure 8) is normally used as a manual operator. The handwheel can be
mounted in either of two position orientations so that, regardless of valve plug action, counterclockwise rotation
always opens the valve. The assembly is a continuously connected type with an indicator to show neutral position. By
rotating the 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 number location are shown in figure 8.
Disassembly
1. Complete steps 1 through 16 of the Disassembly portion of the Size 80 Actuator Maintenance section.
2. Unscrew the cap screws (key 88), and remove the spring case (key 85). Unscrew the cap screws (key 136), and
remove the retaining flange (key 134). Do not lose the key (key 122).
3. Unscrew two screws (key 79), and remove the travel stop indicator (key 126).
4. Turn the handwheel (key 58) to raise the lower sleeve. Continue turning the handwheel until the lower sleeve is free
of the worm gear (key 44). Lift out the lower sleeve, bearing and gear retainer, thrust bearing, and worm gear (keys
123, 45, 43, and 44).
5. The worm shaft (key 51) and associated parts can be removed in order to replace or lubricate them. First, remove
the handwheel cap (key 127) and the handwheel (key 58). Do not lose the small ball or spring (keys 141 and 142).
6. Loosen the two set screws and unscrew the two worm retainers (keys 48 and 49). The ball bearings (key 50) will
come out with the retainers. Remove the worm shaft (key 51).
Assembly
1. Pack the ball bearings (key 50) with lithium grease lubricant (key 237), and insert one ball bearing in the back worm
retainer (key 48).
2. Thread the back worm retainer and ball bearing (keys 48 and 50) into the gear case. Align the set screw slot in the
worm retainer with the set screw hole in the gear case, insert the set screw, and tighten.
3. Coat the worm shaft (key 51) threads with lithium grease lubricant, and slide the shaft into the gear case (key 41) so
that the end of the shaft fits snugly in the back worm retainer.
4. Insert the bearing in the front worm retainer (key 49), and thread the retainer and ball bearing into the gear case.
Align the set screw slot in the retainer with the set screw hole in the gear case, insert the set screw, and tighten.
5. Put the spring and ball (keys 142 and 141) in the handwheel (key 58). Slide the handwheel onto the worm shaft (key
51). Thread the handwheel cap (key 127) onto the worm shaft.
6. Pack the two thrust bearings (key 43) with lithium grease 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 45).