Instruction Manual
D102087X012
585C Actuator
October 2013
16
Replacing Handwheel Housing O-Ring or Thrust Bearings (Sizes 25 & 50)
Perform this procedure if inspecting or replacing the handwheel housing O-ring, handwheel thrust bearings, or any
other handwheel parts located above the cylinder (key 1). Inspection or replacement of the cylinder O-ring, handwheel
stem, or handwheel stem jam nut (key 57, 56, or 52) are covered in the Replacing Seals, Changing Action, or Changing
Bias Spring(s) procedure. Key numbers are referenced in figure 5 for a 585C actuator (spring retracts actuator rod) and
in figure 7 for a 585C actuator (spring extends actuator rod).
Note
This procedure may be performed without removing the cylinder, or yoke (key 1 or 6) from the bonnet of the valve.
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, and release all
pressure from the actuator. 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.
1. Shut off the bypass valve (key 66). Remove the cylinder pressure piping and bypass tubing from the bypass tees
(key 68) on the cylinder (key 1).
2. Turn the handwheel (key 47) in the appropriate direction so the neutral indicator (key 42) is behind the NEUTRAL
position of the neutral indicator plate (key 37).
3. Unscrew and remove the neutral indicator cover (key 35).
4. Remove the handwheel retaining ring, handwheel, and locking key (keys 48, 47, and 65).
5. Loosen the bearing cover set screws (key 51), and unscrew and carefully remove the bearing cover (key 38).
6. Remove the handwheel housing O-ring (key 58) and the top set of thrust bearings (key 39).
7. Since both the handwheel housing (key 36) and the operating nut (key 46) have left-hand threads, unscrew the
handwheel housing by turning it clockwise off the operating nut. Carefully remove the detent ball and detent spring
(keys 64 and 63), and remove the bottom set of thrust bearings (key 39).
8. Unscrew the handwheel stem cap screw (key 60) while using a 7/8 inch wrench to hold the handwheel stem
(key 56). Remove the handwheel stem washer (key 45), and the operating nut (key 46) with attached neutral
indicator (key 42).
9. Unscrew the neutral indicator (key 42) counterclockwise if necessary to separate it from the operating nut (key 46).
Reassembly
1. If the neutral indicator (key 42) was removed, coat its threads with thread locking adhesive (medium strength)
(key 70) and screw it into the operating nut (key 46). Position the 90-degree elbow of the neutral indicator so that it
will not interfere with the neutral indicator cover (key 35) when assembled.
2. If necessary, replace the anti-rotation key (key 40), by pushing the key outward from the cylinder (key 1) then install
the replacement key (key 40) into the anti-rotation hole of the cylinder.
