Installation Instructions

Instruction Manual
D102087X012
585C Actuator
October 2013
19
2. To achieve the desired construction (either a direct-acting or a reverse-acting 585C actuator), perform one of the
following assembly procedures (a, b, or c, as appropriate):
a. For 585C actuators (bias spring retracts the piston rod) (figures 4 and 5),centertheinnerbiasspring,ifused,
(key17pertable6or7)aroundthecenterbossintheyoke(key6).Ifusedpertable6or7,centertheouterbias
spring (key 16) around the inner bias spring. The outer bias spring should be within the outer boss in the yoke.
Put the travel stop spacer and the piston (keys 5 and 3) on the actuator stem. Apply lithium grease (key 24) to
the threads of the piston cap screw or piston stud (key 4 or 69). Insert the piston cap screw, or stud plus attached
handwheel stem (key 56), through both the piston and travel stop spacer and into the actuator stem. Use a
wrench on the flats of the actuator stem to prevent it from turning. Tighten the piston cap screw, or stud plus
attached handwheel stem, to 102 NSm(75lbfSft) for size 25 actuators or 136 NSm(100lbfSft ) for size 50
actuators.
b. For 585C actuators with push-only handwheel (figure 8), lubricate the O-rings and handjack stem threads with
lithium grease. Install the O-ring (key 57) and handjack stem (key 56), turning the screw into the housing as far as
possible. Place the O-ring (key 58) over the housing and insert into the cylinder (key 1). Replace the cap screws
(key 60) and tighten to 41 NSm(30lbfSft) on size 25 actuators or 81 NSm(60lbfSft) on size 50 actuators. Replace
the jam nut (key 52), handwheel (key 47), and slotted nut and cotter pin (keys 72 and 73).
c. For 585C actuators (bias spring extends the piston rod) (figures 6 and 7), put the piston (key 3) on the actuator
stem and the travel stop spacer (key 5) on the piston. Apply lithium grease (key 24) to the threads of the piston
cap screw or piston stud (key 4 or 69). Insert the piston cap scr ew, or stud plus attached handwheel stem (key
56), through both the travel stop spacer and piston and into the actuator stem. Use a wrench on the flats of the
actuator stem to prevent it from turning. Tighten the piston cap screw, or stud plus attached handwheel stem,
to 102 NSm(75lbfSft) for size 25 actuators or 136 NSm(100lbfSft) for size 50 actuators. Center the inner bias
spring, if used, (key 17 per table 4 or 5) around the travel stop spacer. If used per table 4 or 5, center the outer
bias spring (key 16) around the inner bias spring. The outer bias spring should be within the outer boss on the
piston.
3. Install the piston O-ring (key 8) if it was removed from the piston, and the yoke O-ring (key 7, figure 4 or 6) if it was
removed from the yoke (key 6). Apply lithium grease (key 24) to the wall of t he cylinder (key 1) and carefully slide
thecylinderoverthepistonO-ring.Besurethecylinder pressure connection is aligned with the yoke pressure
connection. Square the cylinder in place over the yoke O-ring.
4. Line up the cylinder holes with the yoke holes making sure for a handwheel construction that the anti-rotation
groove in the handwheel stem (key 56) is aligned with the hole in the cylinder for the anti-rotation key (key 40).
Note
When placing the cylinder on the yoke and tightening the cylinder-to-yoke bolts, be sure to keep the cylinder square and aligned
with the top of the yoke.
5. Lubricate the cylinder-to-yoke bolts (key 2) with lithium grease (key 24). In a criss cross pattern, alternately tighten
each cylinder-to-yoke bolt a slight amount so that the cylinder stays square with the yoke. When all cylinder
surfaces are in contact with the yoke, tighten each cylinder-to-yoke bolt to 70 NSm(55lbfSft) for a size 25 or 95
NSm(70lbfSft) for a size 50.
6. With a handwheel construction, perform steps 2. through 10. of the Replacing Handwheel Housing O-ring or
Thrust Bearings procedure.
7. If the actuator will be mounted on a valve, perform the appropriate actuator mounting procedure. Otherwise, place
the stem connector nut (key 13), stem connector (key 12), two cap screws (key 14), two hex nuts (key 23) and hex
nut (key 15) in a parts bag and attach the bag to the actuator yoke.