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Instruction Manual
D102087X012
4. Insert a screwdriver in the two slots on the lower edge of the cylinder casting and pry the cylinder loose from the
yoke. Remove the cylinder, being careful not to mar the cylinder wall.
5. The piston (key 3) and actuator stem (key 10) will come out with the cylinder. The piston can then be removed by
forcing it out the open end of the cylinder.
6. Unscrew the seal bushing (key 110 or 26), in the upper end of the yoke (key 6).
7. With the unit disassembled, inspect all parts for excessive wear. Replace all worn O-rings. Lubricate (key 24) as
indicated on the assembly drawings. Apply sealant (key 70) as indicated on the assembly drawings.
8. When reassembling the actuator after the piston nut (key 4) has been removed from the actuator stem (key 10),
clean the threads of the piston nut thoroughly and apply thread sealant to the threads. Tighten the piston nut
securely to a torque of 237 NSm (175 lbfSft) for size 60 actuators, 1290 NSm (950 lbfSft) for size 68, 80, and 100
actuators, or 2070 NSm (1530 lbfSft) for size 130 actuators.
Side-Mounted Handwheel Maintenance (Sizes 60-130)
Refer to figure 9 and 10.
1. The handwheel gears should be lubricated periodically. A grease fitting (key 140) is provided on sizes 80, 100, and
130. On sizes 60 and 68, remove the handwheel (key 118) and the bevel pinion (key 116) and pack the gear case
with lithium grease. Loosen the set screw (key 139) before attempting to remove the pinion and extension.
2. If it is necessary to change the valve plug action from push-down-to-close to push-down-to-open or vice versa,
change the handwheel arrangement so that the arrow indicates the correct rotation required to open the valve.
a. For sizes 60 and 68, remove the handwheel, invert and replace it. On sizes 60 and 68 (figure 9), remove and
replace the spring-loaded ball assembly (key 123) in the opposite side.
b. For sizes 80-100, remove the handwheel assembly and install in the opposite end of the gear case by unscrewing
the back and front worm retainers (keys 135 and 136, not shown) and turn the handwheel to disengage the
bevel pinion (key 116).
Disassembly of Handwheel Constructions (Sizes 60 and 68)
WARNING
Refer to the WARNING at the beginning of the Maintenance section (Sizes 60-130) in this instruction manual.
To disassemble 585C piston actuators sizes 60 and 68 (with handwheel) for maintenance, perform the following
procedures (figure 9 and 10):
1. Be sure that all pressure is out of the cylinder and valve body.
2. Remove all tubing lines to the positioner.
3. Remove the cap screws (key 2) on the underside of either the cylinder flange (key 100) for size 60 or the adapter
flange (key 76) for size 68. Remove the cylinder (key 1).
4. Remove the piston nut (key 4), then use a mallet to tap the piston (key 3) off the piston connector (key 107).
5. Remove the handwheel extension (key 117) by loosening the set screw (key 139) and unscrewing the extension.
6. Remove the cap screws (key 2) holding the cylinder flange (key 100) to the yoke (key 6).
7. Lift the cylinder flange (key 100) off the yoke (key 6).
8. Inspect the handwheel gears and bearings as needed.
585C Actuator
October 2013
21
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