Instruction Manual
D102087X012
585C Actuator
October 2013
18
CAUTION
When performing the following step, set the cylinder on a protective surface to prevent damage to t he cylinder surfaces.
3. Remove the cylinder (key 1). Set the cylinder on a protective surface to prevent damage to the cylinder surfaces.
With a handwheel construction, inspect the cylinder O-ring (key 57) and replace it if necessary, applying lithium
grease (key 24) to the replacement O-ring.
4. Inspect the piston O-ring (key 8) and replace, if necessary. If the only further maintenance to be performed is
replacement of the piston O-ring, skip to step 3. of this procedure.
Note
585C actuators may be used with or without the bias springs. In the following procedures, references are made to the bias springs.
If the bias springs are not used, disregard references to them when performing the maintenance procedures.
5. Performoneofthefollowingdisassemblyprocedures(a,b,c,d,ore,asappropriate):
a. For 585C actuators without handwheel (If t he bias spring is present, it extends the piston rod.) (figure 6),remove
the piston cap screw (key 4), piston (key 3), bias spring(s) (key 16 and/or key 17), and travel stop spacer (key 5).
b. For 585C actuators with handwheel (If the bias spring is present, it extends the piston rod.) (figure 7),removethe
handwheel stem (key 56) with attached piston stud (key 69), piston (key 3), bias spring(s) (key 16 and/or key 17),
andtravelstopspacer(key5).
c. For 585C actuators without handwheel (If the bias spring is present, it retracts the piston rod.) (figure 4),remove
the bias spring(s) (key 16 and/or key 17), piston cap screw (key 4), travel stop spacer (key 5) and piston (key 3).
d. For 585C actuators with handwheel (If the bias spring is present, it retracts the piston rod.) (figure 5), remove the
bias spring(s) (key 16 and/or key 17), the handwheel stem (key 56) with attached piston stud (key 69), travel
stop spacer (key 5), and piston (key 3).
e. For 585C actuators with push-only handwheel (figure 8), remove the cotter pin and slotted nut (keys 73 and 72)
and lift off the handwheel. Remove the jam nut (key 52). Remove the cap screws (key 60) and lift off the
handwheel housing (key 36). Back the handwheel stem (key 56) out of the housing. Inspect the O-rings (keys 57
and 58). Replace these parts as necessary.
6. If inspection or replacement of the actuator stem O-ring or bearing (key 9 or 11) is necessary, perform steps 1.
through 7. Otherwise skip to step 2. , being sure to comply with the note preceding step 2.
7. Loosen the two cap screws in the stem connector (key 14) and remove it. If the actuator is mounted on a valve,
separate the actuator stem (key 10) from the valve plug stem. Remove the actuator from the valve.
8. To inspect the actuator stem bearing (key 11), actuator stem O-ring (key 9), or backup ring (key 25, size 50 only)
remove the actuator stem (key 10) from the yoke (key 6). Replace these parts if necessary. Apply lithium grease
(key 24) to the replacement O-ring or bearing and install it into the yoke.
Assembly
1. Install the actuator stem through the yoke.
Note
Make certain the travel indicator scale (key 19) correctly matches the travel per the Parts List.
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