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14 MHD56087 - Edition 4
REVIEW COPY 6
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21
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02
Emergency Stop Reset
(Dwg. MHP2048)
Overload Device (optional feature)
An overload device is available on winches with the emergency
shutoff option. Overload device operation is based on differential
pressure between air motor inlet and exhaust. The overload device
is factory preset to actuate at 150% (± 25%) of winch rated
capacity. When an overload condition is sensed, the valve poppet
closes, to cut off supply air to winch, stopping winch operation. If
an overload shutoff occurs, winch load must be reduced. Reset the
overload valve and operate winch in payout direction to lower
load. Refer to ‘Emergency Stop Reset’ section on page 13.
Overload Valve Adjustment
Refer to Dwg. MHP2216 on page 14.
5/16 in. or 8 mm open ended wrench required.
1. Adjust overload valve by turning adjustment screw located at
bottom of control valve.
2. Rotating adjustment screw clockwise will increase pressure
required to activate overload valve.
• This adjustment can cause overload device to NOT activate
before winch’s overload limit is exceeded. This procedure
should only be done by personnel trained in testing and
servicing this winch.
3. Rotating adjustment screw counterclockwise will decrease
pressure required to activate overload valve.
Overload Valve Adjustment
(Dwg. MHP2216)
Checking Overload Valve Setting
1. Attach load line to a load that is calibrated to maximum load
for which winch is rated.
2. Move control lever to haul-in position. If winch does not lift
load, adjust the adjustment screw. Refer to ‘Overload Valve
Adjustment’ section on page 14.
Setting the Overload
Attach load line to a load that is calibrated to 150% of winch rated
capacity. Shift control lever to haul-in position.
1. If overload valve activates, reset overload valve. Winch is
ready for normal operation.
2. If winch lifts load, lower load. Turn adjustment screw
counterclockwise in 1/4 turn increments until overload valve
activates when control lever is shifted to haul-in position.
After each 1/4 turn, retest winch.
Overload Valve Reset
(Dwg. MHP2049)