Warner Electric CB Series and Super CB Series Sizes 2, 4, 5, 6 and 8 - Manual (Page 11)

11 Warner Electric • 800-825-9050 P-258 • 819-0406
5. CB Spring Differential Adjustment
All CB and Super CB Series clutch/brakes are
shipped from the factory with the proper spring
differential overtravel setting. If the spring
differential is incorrectly set, the clutch or brake
spring may fail to engage or disengage properly.
When units are assembled at the factory, and after
the proper spring differential is set, for both the
clutch and the brake springs, a punch mark is
placed on either side of the slot where the spring
tang is located (see Figure 7). If the unit must be
disassembled, and the collar and springs are to
be reused, ensure these marks are prevalent.
Then, when reassembling the unit, place the
spring tangs in the collar slots where the marks
are and the differential setting will be returned to
its original position.
Measuring the Differential Setting
Rotate the clutch so the brake spring is fully
wrapped down by rotating the output shaft in the
driving direction until it cannot travel any farther.
With the brake fully engaged (wrapped down),
hold the output shaft with one hand and release
the actuator. The stop collar will rotate forward as
the brake is released and the clutch engages.
Hub
Punch Mark
Slot with Spring
Tang Collar
Punch Mark
Figure 7
To determine the overtravel, use a scale to
measure the distance between the tip of the
actuator and the tip of the cam. (See Figure 8)
The amount of overtravel varies with the
size of the unit:
CB-2 .09 to .19"
CB-4 .09 to .19"
CB-5/Super CB-5 .09 to .19"
CB-6/Super CB-6 .22 to .38"
CB-8/Super CB-8 .39 to .60"
Note: If the unit’s overtravel falls within these
specifications, then the spring differential setting is
correct. If the overtravel falls outside these
specifications, then follow the steps outlined
below for “Setting the Spring Differential.”
Setting the Spring Differential
If the differential setting is lost and the slots are
unmarked, or if the collar or springs must be
replaced, use the following procedure to reset the
spring differential.
+
+
Overtravel/Differential
Setting
Figure 8