Owner's Manual for Thern 5PA5 and 5PA10 Ensign Series Portable Davit Cranes
page 11
A115771-0617
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 18-21.
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.
a
IN SOME SITUATIONS it may be desirable to use the winch to lower the
boom. Secure the load hook at the rear of the boom as shown in Figure 6. The
wire rope must be installed correctly to prevent damage to the rope. Once the
boom brace assembly is removed, and the boom safely lowered, remove the
load hook from the rear of the boom.
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
Manual.
3.3.6
REMOVE THE SHEAVE ASSEMBLY from the boom. Replace the
attachment 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
removed.
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.
3.3.11
REMOVE THE BEARING from the base. Install a cap over the base to
prevent debris and other contaminants from getting into the base.
