Fisher D500243X012 Instruction Manual page 13

Instruction Manual
Form 5417
February 2007
PISTON
(KEY 2)
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.
ELO A4.204.03
A7038 / IL
Figure 6. Spring Return End Cap Assembly
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 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).
TRAVEL STOP
SCREW
(KEY 37)
HEX (LOCK)
NUT
(KEY 38)
WASHER
(KEY 34)
SPRING HOLDER
(KEY 9)
Note
1035/El-O-Matic Actuator
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.
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.
Note
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