SWDM40 OPERATION & MAINTENANCE MANUAL
●In order to protect cathead from being hit by the top of Kelly bar when main winch is pulled
up, a limit switch is activated when Kelly bar reaches to the top and the main winch can only
descend and not ascend. Follow below steps to cancel the limit when the Kelly bar is needed to
change under some special conditions:
The "Button 1-working switch" in the Membrane Keypad Panel is not connected, pull left pilot
handle rearward, press down both SB1 and SB2 buttons together, operate the main winch to rise
the Kelly bar by crossing the limit, much attention should be paid to do above operations.
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