Instruction Manual
D102087X012
585C Actuator
October 2013
17
3. Lubricate the inside surface of the operating nut (key 46) with lithium grease (key 24). Install the operating nut with
the attached neutral indicator, and the handwheel stem washer (key 45), onto the handwheel stem (key 56) and
secure with the handwheel stem cap screw (key 60). Tighten the cap screw to 169 N
S
m (125 lbf
S
ft).
4. Place the bottom set of thrust bearings (key 39) on top of the cylinder (key 1). Insert the detent spring and ball
(keys 63 and 64) into the cylinder.
5. Install the handwheel housing O-ring (key 58) on the handwheel housing (key 36). Since both the handwheel
housing and the operating nut (key 46) have left-hand threads, thread the handwheel housing onto the operating
nut by turning it counterclockwise over the operating nut until the handwheel housing is snug against the bottom
set of thrust bearings (key 39).
6. Install the top set of thrust bearings (key 39) over the handwheel housing (key 36).
7. Carefully slide the bearing cover (key 38) over the handwheel housing (key 36) and thread the bearing cover hand
tight onto the cylinder (key 1). Secure by tightening the set screws (key 51) to 18 N
S
m (13 lbf
S
ft).
8. Install the locking key, handwheel, and handwheel retaining ring (keys 65, 47, and 48).
9. Screw the neutral indicator cover (key 35) hand tight only onto the handwheel housing (key 36).
10. Install the bypass tubing with attached bypass valve (key 66) into the bypass tees (key 68) in the cylinder (key 1).
Replacing Seals, Changing Action, or Changing Bias Spring(s)
(Sizes 25 & 50)
Key numbers are referenced in figures 4 and 5 for a 585C actuator (spring retracts actuator rod) and in figures 6 and 7
for a 585C actuator (spring extends actuator rod).
Disassembly
Isolate the control valve from the line pressure, release pressure from both sides of the valve body, and drain the
process media from both sides of the valve. Shut-off all pressure lines and power to the actuator, release all pressure
from the actuator, and release all bias spring compression force by slowly unscrewing the cylinder cover bolting in a
crisscross pattern. Use lock-out procedures to be sure that the above measures stay in effect while you work on the
equipment.
WARNING
Refer to the WARNING at the beginning of the Maintenance section in this instruction manual.
For 585C actuators with push-only handwheel, figure 8, be sure the handjack stem is backed out of the cylinder as far
as it will go to relieve any extra spring compression.
1. Remove the cylinder pressure piping. With a handwheel construction, perform steps 1. through 2. of the
Replacing Handwheel Housing O-Ring or Thrust Bearings procedure.
Note
In the following step, loosen each cylinder-to-yoke cap screw a slight amount in turn in a crisscross pattern to keep the cylinder
square with the yoke while relieving spring precompression.
2. While carefully allowing bias spring precompression to be slowly released, remove the cylinder-to-yoke cap screws
and cylinder cover (keys 2 and 1).
