Spring Release Latch "Bite" Adjustment - Siemens SDV-4A Instruction Manual

Operator Adjustments

Spring Release Latch "Bite" Adjustment

1. Remove front panel of operator.
2. Find spring release latch adjusting screw located in the
vertical flange of the operator (10-32 recessed hex socket
set screw, see Figure 27).
3. Nominal latch bite adjustment occurs with the latch ly-
ing in the horizontal position as shown in accompany-
ing Figure 28. This position is achieved when the ad-
justing screw has been turned into the prevailing torque
Vertical Flange
Left Hand
Mechanism
Stanchion
Approximately 14
Turns of
Adjusting Screw
1.390
.937
Hex Socket
Adjusting
Screw
(#10-32 UNF-2A)
.000
1-2 Turns
Note: All Dimensions
Shown In Inches.
Figure 28. Spring Release Adjustment Screw.
self clinching nut 14 full turns.
The set screw will be within 1 to 2 turns of being flush
to the self clinching nut, protruding slightly.
The adjusting screw should not be advanced more than
16 turns. Four turns beyond the nominal 14 turns is
sufficient to reach the "threshold" beyond which the
spring release will occur and latch stability will be lost.
Spring
Release
Latch
Spring
Release
Rotation
Spring Release
Interlock Lever
Spring
Release
Shaft
Closing Spring
Hatchet
and Roller
30