Owner's Manual for Thern 5PA5 and 5PA10 Ensign Series Portable Davit Cranes
page 14
A11577I-0617
3.4.4
Instructions for Periodic Inspection
a
VISUALLY INSPECT the crane and all other equipment.
• Check the finish for wear, flaking, or other damage.
• Check all equipment for cracks, dents, bending, rust, wear, corrosion and
other damage. If the equipment was overloaded, or if you notice cracks
and other signs of overloading and damage, promptly remove equipment
from use and have it repaired or replaced.
DO NOT CONTINUE TO
USE DAMAGED OR OVERLOADED EQUIPMENT OR wIRE
ROPE
.
• Check all fasteners for stripped threads, wear, bending, and other damage.
• Make sure the entire crane is properly lubricated.
• Check the boom brace assembly for signs of damage, and make sure it
operates smoothly to raise and lower the boom.
• Make sure all labels and plates are readable, firmly attached, free of
damage and clean. Replacements are available from the factory.
b
INSPECT THE WIRE ROPE according to the wire rope manufacturer's
recommendations, or follow accepted industry standards for wire rope
inspection.
• Always wear protective clothing when handling wire rope.
• Check the entire length of wire rope for bent wires, crushed areas, broken
or cut wires, corrosion, and other damage. Carefully inspect areas that
pass over sheaves or through roller guides.
• Note the location and concentration of broken wires. Replace wire rope if
more than 6 wires are broken in one lay, or more than 3 wires are broken
in one strand in one lay. See Figure 9.
• Make sure the load hook or other device is securely attached to the wire
rope, and the wire rope where it is attached is not frayed, corroded,
broken, or otherwise damaged.
• Measure the throat opening, thickness, and twist of the hook. Replace the
hook if it shows signs of damage. See Figure 10.
• Make sure hook latch opens without binding and closes when released.
• Check the anchor holes in the drum and the surrounding area for signs of
wear or distortion.
c
PLACE enough weight to keep the wire rope straight and tightly drawn.
• Measure the diameter of the wire rope, especially in areas where wear
is noticeable. Replace the wire rope if the diameter measures below the
minimum diameter at any point. See Figure 11.
d
REMOVE THE WINCH and inspect it by following the instructions in the
Winch Owner’s Manual.
e
DISASSEMBLE THE CRANE.
• Inspect each component for damage.
f
REMOVE THE CRANE BASE from the foundation.
• Check fasteners for stripped threads, wear, bending, and other damage.
• Check the foundation for cracks, corrosion, and other damage.
twist
throat
opening
thickness
Figure 10 – Load Hook
Inspection
The wire rope assembly must be
replaced if the throat opening is
15% wider than nominal, if the
thickness is 10% less than nomi-
nal, or if the hook is twisted 10°
or more.
wire
strand
one
lay
Figure 9 – Broken Wires
Wire rope assembly must be re-
placed if more than 6 wires are
broken in one lay, or if more than
3 wires are broken in one strand
in one lay.
Perform periodic inspections:
• Every 6 months.
• Whenever you return the crane to
service from storage.
• Whenever you notice damage
or poor operation in a frequent
inspection.
• Whenever you have, or think you
may have, overloaded or shock
loaded the crane.
