2
A
5-1/2
(140)
1-3/4
(44)
1-1/4
(32)
3/
4
(19)
1
(25.4)
12
(304.8)
E
A
B
C
D
G
90°
L
S
(2)
or
L
S
F
PARTS
MARK & DRILL HOLES
Inches
(mm)
R
L
Y
S Z
SWEEP
LATCH
Slim c
over
Stronger
Weaker
Slower
Faster
Slower
Faster
Regular Arm Installation (Pull Side)
with No Hold-Open
Forearm
Link
Main Arm
Right Hand shown
Forearm
Shoe
1
2
4
5
INSTALLATION SEQUENCE
SPRING POWER ADJUST
Opening
Dimension"A"
To 100°
7-1/2
(191)
101° to 130°
131° to 180°
6
(152)
4-1/2
(114)
5
3
6
7
BACKCHECK (BC) & OPTIONAL DELAYED ACTION (DA)
BC
DA
Harder
Softer
LONGER
SHORTER
PINION CAP OR
OPTIONAL COVER
Caution:
Don't completely
close valve
851-INST EN 2018/04
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