5
10. The factory approved adaptions for PACCAR winches
are designed and intended for use on specifi c models
of crawler tractors. Changing winches between trac-
tors is not possible in some cases because of differ-
ences in tractor models. Some changes cannot be
approved by PACCAR because of safety limitations.
Call the tractor dealer or the PACCAR factory prior to
attempting winch modifi cations or before mounting on
a different tractor.
11. PACCAR H50 winches are powered by the tractor hy-
draulic system. Turn off engine and discharge all re-
tained hydraulic system pressure before removing any
hydraulic lines or fi ttings. Personal injury may result
from sudden release of oil pressure.
12. On machines having hydraulically, mechanically and/
or cable controlled equipment, be certain the equip-
ment is either lowered to the ground or blocked se-
curely before servicing, adjusting and/or repairing the
winch. Always apply tractor parking brakes and lower
equipment before dismounting the tractor.
13. The winches described in this manual are neither de-
signed nor intended for use or application to equipment
used in the lifting or moving of persons.
14. Install guarding to prevent personnel from getting any
part of their body or clothing caught at a point where
the cable is wrapped onto the drum or drawn through
fairlead guide rollers.
15. Keep equipment in good operating condition. Perform
scheduled servicing and adjustments listed in the “Pre-
ventive Maintenance” section of this manual. Use rec-
ommended lubricants.
16. An equipment warm-up procedure is recommended
for all start-ups and essential at ambient temperatures
below +40°F (5°C). Refer to “Warm-Up Procedure”
listed in the “Preventive Maintenance” section of this
manual.
17. Don’t weld on any part of the winch without PACCAR
Winch Division approval.
WINCH DESCRIPTION
The PACCAR H50 winch is a hydraulically driven winch uti-
lizing a dedicated piston pump for power input. The winch
hydraulic oil pump is usually installed on the tractor trans-
mission pump and the tractor implement pump is installed
on the winch pump in a piggy-back arrangement when
the winch is installed on the tractor. The winch includes
both planetary and standard spur gears as well as a spring
applied, hydraulically released multi-disc static brake for
holding the load secure while in the neutral “Brake-On”
position. The winch case is designed to bolt to the rear
face of the tractor.
When operated in either the Reel-In or Reel-Out direction,
the variable displacement, piston hydraulic motor drives
the gear train. Winch line speed and load control are pro-
portionate to the amount of oil being delivered to the winch
motor by the hydrostatic control system. The winch brake
must be released by pilot pressure through the winch con-
trol valve in both Reel-In and Reel-Out directions.
The Freespool mechanism is a spring-engaged, hydrau-
lically released, splined gear-type connection. As the
control lever is moved into the Freespool position, the oil
is ported through the winch logic valve assembly to re-
lease the brake, and into the freespool cylinder to force
the freespool piston against the coil spring and disengage
the splined connection. This allows the winch cable to be
pulled off the cable drum by hand.
“Drive-Away” mode is controlled by the winch motor. This
function allows the operator to drive the tractor away from
the load while back driving the motor with the winch gear
train. When the control lever is moved into the Drive-Away
position, the winch motor / cartridge valve assembly lim-
its the fl ow of the hydraulic oil through the motor and the
winch brake to allow for smooth, controlled pay-out of the
winch cable. The maximum back driven speed of the winch
motor is limited by a fl ow control valve set to achieve ap-
proximately 2.6 mph (4.2 km/h) tractor ground speed at
the winch bare drum condition.
An optional three roller or four roller fairlead assembly is
available for applications in which slight side directional
pulls are routinely encountered. Use of a fairlead assem-
bly will help to maximize winch case and wire rope life by
eliminating wear due to contact in these applications.
