20
MHD56114 - Edition 4
Periodic Inspection
Periodic inspection intervals for winch use under various
conditions is listed below:
Disassembly may be required as a result of frequent inspection
findings or in order to properly inspect the individual components.
Disassembly steps are described in the “MAINTENANCE”
section. Maintain written records of periodic inspections to
provide an accumulative basis for continuing evaluation. Inspect
all items listed in ‘Frequent Inspection.’ Also inspect the
following:
1.
SIDE RAILS and UPRIGHTS. Check for deformed, cracked
or corroded main components. Replace damaged parts.
2.
FASTENERS. Check retainer rings, split pins, capscrews,
nuts and other fasteners on winch, including mounting bolts.
Replace if missing or damaged and tighten if loose.
3.
DRUM and SHEAVES. Check for cracks, wear or damage.
Replace if necessary.
4.
WIRE ROPE. In addition to “Frequent Inspection”
requirements, also inspect for the following:
a.
Build-up of dirt and corrosion. Clean with steam or a
stiff wire brush to remove dirt and corrosion if
necessary.
b.
Loose or damaged end connection. Replace if
loose or damaged.
c.
Check wire rope anchor is secure in drum.
d.
Verify wire rope diameter. Measure the diameter of the
wire rope from crown-to-crown throughout the life of
the wire rope. Recording of the actual diameter should
only be done with the wire rope under equivalent
loading and in the same operating section as
accomplished during previous inspections. If the actual
diameter of the wire rope has decreased more than 1/64
inch (0.4 mm) a thorough examination of the wire rope
should be conducted by an experienced inspector to
determine the suitability of the wire rope to remain in
service. Refer to Dwg. MHP0056 on page 20.
(Dwg. MHP0056)
5.
ALL COMPONENTS. Inspect for wear, damage, distortion,
deformation and cleanliness. If external evidence indicates
damage, disassemble as required to conduct a detailed
inspection. Inspect gears, shafts, bearings, sheaves, springs
and covers. Replace worn or damaged parts. Clean, lubricate
and reassemble.
6.
BRAKES. Individually test brakes installed to ensure proper
operation. Brakes must hold a 125% rated load at mid drum
without slipping. If indicated by poor operation or visual
damage, disassemble and repair brake(s). Check all brake
surfaces for wear, deformation or foreign deposits. Clean
and replace components as necessary. Adjustments can be
made to the drum band brake to compensate for normal
brake lining wear. Refer to ‘Adjustments’ in the
“MAINTENANCE” section. If brake band cannot be
adjusted to hold rated load, replace the brake band assembly.
Adjustments cannot be made to the disc brake. The disc
brake must be repaired as described in the
“MAINTENANCE” section.
7.
FOUNDATION or SUPPORTING STRUCTURE. Check
for distortion, wear and continued ability to support winch
and rated load. Ensure winch is firmly mounted and that
fasteners are in good condition and tight.
8.
LABELS AND TAGS. Check for presence and legibility of
labels. Replace if damaged or missing.
9.
DRUM GUARD (optional feature). Verify fasteners are tight
and in good condition. Ensure guard is in good condition.
10. EMERGENCY STOP VALVE (optional feature). During
winch operation verify the emergency stop valve operation.
Valve must stop winch operation quickly. Valve must reset
properly. Refer to ‘Emergency Stop Valve’ in the
“OPERATION” section for procedures.
11. OVERLOAD DEVICE (optional feature). Ensure overload
device is properly set to stop the winch when loads exceed
150% (+/- 25%) of winch rated capacity. If winch does not
shut down, contact your distributor or the factory for repair
information.
Winches Not in Regular Use
1.
Equipment which has been idle for a period of one month or
more, but less than six months, shall be given an inspection
conforming to the requirements of “Frequent Inspection”
before being placed in service.
2.
Equipment which has been idle for a period of over six
months shall be given a complete inspection conforming
with the requirements of “Periodic Inspection” before being
place in service.
3.
Standby equipment shall be inspected at least semiannually
in accordance with the requirements of “Frequent
Inspection”. In abnormal operating conditions equipment
should be inspected at shorter intervals.
NORMAL
HEAVY
SEVERE
yearly
semiannually
quarterly
