TM 9-2330-294-14
Unloading
Non-Operating
c. Winching-On Non-Operating Vehicle.
Payload Vehicle
WARNING
a. General. Truck tractor M746 is equipped with
At no time during loading operation should
two 60,000 lb (set to 35,000 lb line pull) winches and
personnel be on the semitrailer bed.
the truck tractor M123E2 is equipped with two
WARNING
95,000 lb line pull winches. The following paragraphs
Loading should not be conducted on side and
provide precautions and procedures used in loading
lateral slopes exceeding 10 percent and with
and unloading a non-operating or disabled vehicle
tractor- semitrailer offset angle greater than
including vehicles with one or both tracks missing.
5 degrees. Avoid loading on a downgrade to
Using a single winch truck tractor to load or unload a
prevent payload from rolling forward on
completely disabled vehicle, with engine inoperative,
semitrailer.
without steering or brake controls is not recom-
(1) Position semitrailer in line with payload on
mended.
as level ground as possible. Set towing vehicle and
semitrailer parking brakes.
NOTE
(2) Prepare semitrailer for loading (para 2-19 b).
When additional snatch block is required use
(3) If two vehicles (M113 series and/or M114)
snatch block from towing vehicle.
are to be loaded, remove and stow two gooseneck
b. Precautions.
(1) Make sure towing vehicle and semitrailer
WARNING
parking brakes are applied to assure maximum
Do not overload winches. The M746 tractor
vehicle
stability
winch-on/winch-off
during
winches are set by valves to a maximum of
operation.
35,000 lb line pull. The M123E2 tractor
(2) If on a grade, the downhill side of wheels
winches are protected by shear pins for
should be blocked.
maximum of 25,000 lb line pull.
(3) Use blocks under rear frame of semitrailer
WARNING
while loading payloads of 55 tons or greater (B, fig.
Always wear leather gloves when handling
2-15).
cables. Never allow cable to run through
(4) Provide ample clear space behind disabled
hands.
vehicle during loading to protect personnel and
(4) Unwind hemp rope and lay rope doubled up
prevent equipment damage should cables break
releasing payload when payload is on ramp.
Position rope over bed crossmembers. The-loop in
(5) All unnecessary personnel should stand
rope should be at front and loose ends at rear of
clear of loaded cables.
semitrailer bed. This rope will be used to reeve (pull)
(6) A ground guide should stand off rear corner
winch cable to snatch block during unloading.
of semitrailer and maintain visual contact with
(5) Operate winches and slowly let out cable.
winch operator. He should observe cables, snatch
Thread cables through upper gooseneck rollers and
blocks, shackles and payload position.
attach single line cables to towing lugs of payload
(7) Make sure winch cables are not kinked and
that all blocks and shackles are in good condition
WARNING
and properly secured.
During winching operations be sure that all
(8) Side slope and longitudinal slope loadings
personnel not involved in the operation are
should be limited to a maximum slope of 10 percent.
clear of the winch cables and payload.
Loading on slopes greater than 10 percent may cause
(6) Station guide on each side of payload vehicle
loss of control of payload vehicle.
to provide directions to winch operator during
(9) During winch-on operations on longitudinal
winching operation.
downgrade, the payload vehicle must be restrained
(7) Using winches pull payload vehicle into
from the rear with some other vehicle to prevent
possible loss of control of the payload.
slowly up ramp, keeping both winch cables under
(10) Prior to loading operations, a system of
signals to include "start", "stop", and "slow down"
(8) After payload is on semitrailer, move curb-
etc., should be worked out between operator of
ing from position F to position A on semitrailer
towing vehicle winch, operator of payload vehicle
and all guides (Refer to FM 21-305).
(9) Continue to winch payload vehicle onto
(11) During any operation on a slope, extreme
semitrailer until it is snug against gooseneck
caution should be exercised.
bumpers. Some vehicles may require a change in
rigging to allow them to be brought snug against
weight and placement of curbing.
bumpers.