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A25317-A-1119
Owner's Manual for Thern 5FT20 and 5FT25 Captain Series Stationary Davit Cranes
page 11
3.3
Disassembling the Crane
When removing the boom extension, hold the boom extension securely so it
does not slide abruptly in or out of the boom causing damage or injury.
When removing the ratchet jack, support the end of the boom so the boom
does not fall and the ratchet jack does not swing up causing damage or injury.
3.3.1
STUDY PARTS DRAWINGS to understand how the crane is assembled.
See pages 19-20.
3.3.2
REMOVE ANY ATTACHED LOAD from the wire rope.
3.3.3
REMOVE THE WIRE ROPE.
a
REMOVE THE ROPE KEEPER PINS located at the ends of the boom.
b
UNWIND THE ROPE from the winch drum and release the anchor.
c
REPLACE THE ROPE KEEPER PINS.
3.3.4
REMOVE THE WINCH HANDLE on hand winches, or disconnect power
supply to power winches. Refer to instructions in theWinch Owner’s Manual.
3.3.5
REMOVE THE WINCH and adapter plate from the crane.
3.3.6
REMOVE THE BOOM EXTENSION.
a
ADJUST THE BOOM ANGLE using the ratchet jack so the boom is
horizontal.
b
SECURE THE BOOM EXTENSION then remove the lynch pin and
clevis pin securing the boom extension to the boom.
c
CAREFULLY PULL THE BOOM EXTENSION out of the boom, then
reinstall the clevis pin and lynch pin in the boom.
3.3.7
REMOVE THE RATCHET JACK.
a
SECURE THE BOOM to prevent it from falling when the ratchet jack is
released.
b
DISCONNECT THE RATCHET JACK at the mast by removing the
lynch pin and clevis pin. Be careful that the ratchet jack does not swing
and cause injury.
c
REMOVE THE PIN AT THE BOOM to disconnect the ratchet jack from
the crane. Hold onto the ratchet jack to prevent it from falling away.
d
RECONNECT the clevis pins to the boom and mast with the appropriate
lynch pins.
3.3.8
DISCONNECT THE BOOM from the mast.
a
SECURE THE BOOM to prevent it from falling away when the pins are
removed.
b
REMOVE THE LYNCH PIN AND CLEVIS PIN and carefully remove
the boom.
c
REPLACE the clevis pin and lynch pin in the mast.