Bell System Practices Plant Series Adjustments page 6

SECTION 573-127-700
2. 03 Clutch Trip Mechanism
REQUIREMENTS APPLY TO BOTH CLUTCH TRIP MECHANISMS.
(A) CLUTCH ARMATURE AIRGAP
REQUIREMENT
AIRGAP BETWEEN ARMATURE AND MAGNET
ASSEMBLY BRACKET WITH ARMATURE FLUSH
AGAINST MAGNET CORE
0.004
MIN.
0.008
MAX.
TO ADJUST
REMOVE ARMATURE-EXTENSION SPRING.
POSITION HINGE WITH SPR ING POST AND
HINGE MOUNTING SCREW LOOSENED.
RECHECK AIRGAP AND REPLACE SPRING.
MOUNTING SCREW
(REAR
CLUTCH-TRIPLEVER
RESET EXTENSION
REAR PLATE
PLATE
ADJUSTING SCREW
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INCH
INCH.
PLATE
UNIT)
OF
BRACKET ASSEMBLY
(B) CLUTCH TRIP ASSEMBLY MOUNT ­
lNG PLATE
REQUIREMENT
CLEARANCE BETWEEN END OF
ARMATURE BAIL AND LATCH­
ING SURFACE OF CLUTCH­
CLUTCH- TRIPLEVER LOWER EXTEN­
SION WITH CLUTCH-TRIP­
TRIP LEVER
LOWER EXTENSION LEVER RESET EXTENSION ON
HIGH PART OF CAM
UP PLAY IN PARTS FOR MIN­
IMUM CLEARANCE.)
MIN. 0.020 INCH
MAX. 0.030 INCH.
TO ADJUST
POSITION PLATE WITH
SCREWDRIVER IN LOWER
ADJUSTING SLOT WITH
PLATE ADJUSTING SCREW
AND PLATE MOUNTING
SCREW LOOSENED. (TAKE
UP PLAY IN TRIPLEVER IN
DIRECTION OF CAM.)
REQUIREMENT
INVERT UNIT . TRIP CLUTCH MAGNET AND
ROTATE SHAFT MANUALLY UNTIL TRIPLEVER
RESET EXTENSION IS ON HIGH PART OF ITS
CAM.
MIN. 3 OZS.
MAX. 4-1/2 OZS.
FOR 288 UNIT
2-1/2
MIN. OZS.
4-1/2
MAX. OZS.
FOR 28C UNIT
TO START ARMATURE BAIL MOVING.
MAGNET
(TAKE