MHD56114 - Edition 4
25
MAINTENANCE
WARNING
WARNING
• Never perform maintenance on the winch while it is
supporting a load.
• Before performing maintenance, tag controls:
WARNING - DO NOT OPERATE -
EQUIPMENT BEING REPAIRED.
• Only allow personnel trained in safety and service on this
winch to perform maintenance.
• After performing any maintenance on the winch, test winch
to 125% of its rated line pull at mid drum before returning to
service. (Testing to more than 125% of rated line pull may be
required to comply with standards and regulations set forth in
areas outside the USA.)
• Shut off air system and depressurize air lines before
performing any maintenance.
Reduction Gear Assembly
It is recommend that the first oil change be done after
approximately 50 hours initial operation. Always inspect removed
oil for evidence of internal damage (metal shavings, dirt, water,
etc.). Refer to the “LUBRICATION” section for recommended
lubricants.
Adjustments
Disc Brake
Brake adjustment is
not
required. If the disc brake does not hold
100% of rated load at mid drum, disassemble and repair.
NOTICE
NOTICE
• Winches are provided with a breather plug located at the top
of the disc brake housing. If the brake assembly is removed or
repaired ensure the breather is installed and located at the top
of the brake housing during reassembly.
Manual Drum Band Brake (optional feature)
Refer to Dwg. MHP1402 on page 47.
1.
Release wire rope tension on the drum.
2.
Raise handle (135) to free brake bands (136) and (137).
3.
Remove cotter pin (139) and pin (138).
4.
Rotate brake link stud (141) clockwise to increase brake
torque.
5.
Install pin (138) and check adjustment.
NOTICE
• If brake band cannot be adjusted to hold the rated load,
replace the brake band assembly.
6.
Adjust brake so when brake handle locks (goes over-center),
brake will hold rated load.
7.
Install cotter pin (139) when adjustment is complete.
8.
Lift up the brake handle to free position.
Automatic Drum Band Brake (optional feature)
Refer to Dwg. MHP2508 on page 46.
For adjustments, references to “clockwise” and
“counterclockwise” directions, in the text, refer to directions as
viewed from the head end of capscrew (120).
NOTICE
• If brake band cannot be adjusted to hold rated load, replace
the brake band assembly.
1.
Loosen jam nut (117) closest to plunger (114).
2.
Adjust band assembly using capscrew (120).
a.
To loosen band brake, turn capscrew (120) in the
counterclockwise direction.
b.
To tighten band brake, turn capscrew (120) in the
clockwise direction.
NOTICE
• If the capscrew (120) is not accessible, the jam nut (117)
[located closest to the head of capscrew (120)] may be used to
adjust the band brake. Ensure capscrew turns with nut.
3.
When adjustments are complete tighten jam nut (117) closest
to plunger (114).
Pilot Air Control Valve Adjustment (optional feature)
Refer to Dwg. MHP2513 on page 51.
If winch operating speeds differ from performance specifications
pilot air control valve may require adjustment.
1.
Loosen nut (773) and adjust adjusting screw (270), located in
valve cap end (268), until drum speed for no-load haul-in
equals drum speed for full load payout.
2.
Rotate screw (270) ‘out’ to increase drum speed and ‘in’ to
decrease drum speed. It is suggested that a chalk mark be
placed on drum flange so that drum rpm can be accurately
counted.
INTERVAL
MAINTENANCE CHECK
Start of each shift
(Operator or
Maintenance
Personnel)
Make a thorough visual inspection of the
winch for damage. Do not operate winch if
damaged.
Operate winch at low RPM in both
directions. Winch must operate smoothly
without sticking, binding or abnormal
noises. Check operation of the brake(s).
3 Months
(Maintenance
Personnel)
Inspect drum brake friction linings. Clean
or replace parts as required. Adjust drum
brake as necessary.
Yearly
(Maintenance
Personnel)
Inspect the winch gearing, shafts and
bearings for wear and damage. Repair or
replace as necessary.
Check all supporting members, including
foundations, fasteners, nuts, sheaves and
rigging, etc. for indications of damage or
wear. Repair or replace as required.
