DE-STA-CO PN500 - Manual (Page 25)

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SECTION 5: Adjustments (continued)
5.3.1. Clutch Adjustment Description
The clutch must be adjusted to prevent any slippage during normal operation to
prevent shock loading. It should also not be adjusted so tight as to be able to
damage the indexer during a jam or overload. However, it is best to err on the side
of being tighter than required. The proper setting for the clutch is determined by
gradually tightening the clutch adjusting nut until the clutch no longer slips in either
direction during a complete, fully loaded index cycle at normal speed.
5.3.2. Shut-off Spool Use & Adjustment
The shut-off spool (number 8, Figure 14) is attached to body and cone (number 3,
Figure 14) by means of shallow round threads in body and cone (number 3,
Figure 14) and a ball plunger (number 9, Figure 14) in spool (number 8, Figure 14).
When the clutch is operating normally (i.e. not slipping), there is no relative
movement between spool (number 8, Figure 14) and main body (number 3,
Figure 14) and the remainder of the clutch, including the spool (number 8, Figure 14)
driven by pin (number 7, Figure 14). This relative rotation causes the spool to
move along the screw threads on the body (number 3, Figure 14). The spool will
move to the left or to the right, depending on the rotation of the clutch. This lateral
movement of the spool is intended to activate a limit switch arm located in the
center groove in the spool. The "tripped" limit switch should be electrically
connected to the controls to stop the operation of the motor driving the indexer.
To recover from a jam or overload in which the clutch has slipped sufficiently to
displace the shut-off spool:
Manually disconnect the power to the drive motor to prevent an accidental start-up
(use O.S.H.A. approved lockout procedures), clear the cause for the overload.
Then simply push or pull the spool (number 8, Figure 14) on the main body
(number 3, Figure 14) to the thread engagement which is closest to the center
position on the threaded portion of the body (number 3, Figure 14). Check the
limit switch circuitry for proper operating conditions. The indexer can now be
powered up and production resumed.