Fisher D500243X012 - Manual (Page 15)

Instruction Manual
D500243X012
1035/El-O-Matic Actuator
August 2012
15
travel stop screw (key 37). When the travel stop screw (key 37) is removed from the end cap assembly, it will release
the spring clip, washer (key 34), and spring(s) (key 9, 34, and 6, 7, and 8 if used). If reusing springs, return them to
the same location as removed. If replacing springs, replace all the springs in both end caps.
c. For Spring Return P Series Actuators
It is very important to ensure that the springs are fully extended by retracting the piston (key 2) inwards toward the
drive shaft (key 3).
Operationally check the actuator to ensure that the pistons are moved all the way to the center (towards the drive
shaft), before removing the socket head cap screws (key 25, figure 12). Read the steps in this sub-section before
removing the end cap screws (key 25).
WARNING
The pre-loaded spring pressure rests on the pistons when they are extended outward. If the end cap screws are removed
before the spring loading is reduced, the end cap (key 5) can fly off the end of the actuator causing personal injury or
property damage.
Ensure that the pistons are moved fully toward the drive shaft. If this is not possible, provide a means of containing the end
cap while removing the socket head cap screws.
D
The springs are in-between the end cap and piston. Be careful when removing the end cap as the springs may fall
out of the body or end cap. If reusing the springs, re-install them in the same position as removed.
D On a flat working surface, block-up the actuator so it is vertical to avoid the springs falling out of the actuator while
removing the end cap. Repeat on both ends of the actuator.
Note
If re-using springs, mark the springs and their location during disassembly. The springs must be replaced in the same location as
removed when re-assembling the actuator (see figure 9).
D Unscrew end cap socket head screws (key 25) a few turns. Be sure the spring compression is resting on the socket
head cap screws. Equally release the spring compression while removing the socket head cap screws. The spring
precompression should be released before the screws are completely removed. Remove the spring cap assembly
from the actuator body.
3. Clean, inspect, and/or obtain replacement parts. When reassembling the actuator, replace all soft parts provided in
the Parts Kits listed at the end of this manual.
4. Remove the adjustable travel stop/ housing adjustment (see figure 4).
5. Removing the Pistons: The two pistons (key 2) can now be removed by rotating the drive shaft, moving the piston
assemblies outward until the pinion gear has released them.
The gear rack in E Series actuators is machined into the piston, and so does not have to be removed separately. If the
gear rack is damaged, replace both pistons.
Removing the Drive Shaft
1. Remove the spring clip (E Series key 35, P Series key 20) with a pin spanner. Use caution, as the spring clip is under a
great deal of tension. Also, remove the E Series washers (keys 27 and 21) or P Series washer and O-ring (keys 21 and
19) from the shaft.