Fisher D500243X012 - Manual (Page 14)

Instruction Manual
D500243X012
1035/El-O-Matic Actuator
August 2012
14
b. For Spring Return E 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). Refer to figure 6.
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.
The springs are retained within the end cap by the spring holder (key 9).
D
Unscrew end cap socket head screws (key 36) 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.
Figure 6. Spring Return End Cap Assembly
NOTE:
THE PISTON IS SHOWN IN THE FULLY RETRACTED POSITION.
SPRINGS ARE FULLY EXTENDED AND CONTAINED WITHIN THE SPRING HOLDER BY THE WASHER (KEYS 9 AND 34).
THE WASHER KEEPS THE SPRING RETAINER CONNECTED TO THE END CAP.
TRAVEL STOP
SCREW
(KEY 37)
HEX (LOCK)
NUT
(KEY 38)
WASHER
(KEY 34)
SPRING HOLDER
(KEY 9)
PISTON
(KEY 2)
ELO A4.204.03
A7038
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 8).
D Disassembly of the spring end cap assembly: Remove the nut cover (key 42). Remove the hex (lock) nut, washer,
and O-ring (keys 38, 22, and 29). Spring precompression on the spring holder is released while unscrewing the