Emerson EL-O-Matic F Series - Spring-Return Actuators - Size 950 to 4000

Reassembly
9.5.3 Spring-Return actuators - Size 950 to 4000
Important
EL-O-Matic F-Series Spring return actuators are supplied with springs on each side of the
actuator. Throughout the F-Series size range, there are three different spring designs:
— Size F12 has only 1 spring on each side.
— Sizes F25 to F600 have 6 springs on each side (Chapter 9.5.2).
— Sizes F950 to F4000 have 3 springs on each side (see gure below).
Check below gures to see where to place the springs in case of spring set conversion.
When replacing springs in a spring-return actuator, ensure that the springs are replaced in
their identical position from where they were removed.
Before assembling the springs and end caps, make sure that the pistons are completely
inwards.
Figure 34 Spring cartridge placement
A
B
1 spring 0 spring 1 spring 1 spring 2 springs1 spring
2 springs
2 springs 3 springs2 springs3 springs3 springs
Left RightLeftRight Left Right
Left
Right Left RightLeft Right
N = 10 N = 20 N = 30
N = 40 N = 50 N = 60
A = Piston top view
B = Position of gear rack
Installation, Operation and Maintenance Manual
DOC.IOM.EF.EN Rev. 7
September 2017
43
Section 9: Reassembly