Thern 5PA5 Ensign Series, Owner'S Manual

Page: 11 / 24

Owner's Manual for Thern 5PA5 Ensign Series Portable Davit Cranes page 11
A11577B-0613
3.3
Disassembling the Crane
When removing the boom brace assembly, carefully support the boom so that
it does not fall abruptly causing damage or injury.
3.3.1
STUDY PARTS DRAWINGS to understand how the crane is assembled. See
pages 18-19.
3.3.2
REMOVE ANY ATTACHED LOAD from the wire rope.
3.3.3
LOWER THE BOOM by removing the boom brace assembly. Carefully
support the boom so that it does not fall abruptly causing damage or injury.
3.3.4
REMOVE THE WIRE ROPE.
a
REMOVE ROPE KEEPER PINS located at each sheave near the ends of the
boom.
b
UNWIND THE ROPE from the winch drum and release the anchor.
c
REPLACE THE ROPE KEEPER PINS
3.3.5
REMOVE THE WINCH HANDLE on hand winches, or disconnect electric
current on power winches. Refer to instructions in the Winch Owner’s Man-
ual.
3.3.6
REMOVE THE SHEAVE ASSEMBLY from the boom. Replace the attach-
ment clevis pin back in the sheave assembly to prevent loss.
3.3.7
DISCONNECT THE BOOM from the mast.
a
SECURE THE BOOM to prevent it from falling when the clevis pin is re-
moved.
b
REMOVE THE CLEVIS PIN and carefully remove the boom.
c
REPLACE the clevis pin to prevent loss.
3.3.8
REMOVE THE WINCH and mounting bracket from the mast. Replace the
clevis pin to prevent loss.
3.3.9
REMOVE THE ROTATION HANDLE from the mast. Replace the clevis
pin to prevent loss.
3.3.10
REMOVE THE MAST FROM THE BASE by lifting it straight out of the
base.
TO REASSEMBLE, SEE SECTION 1.2 – ASSEMBLING THE CRANE.