
66 SEBU8213-04
Operation Section
Machine Operation
For the forward
modes or the reverse modes, the
pumps and the motors work in conjunction with each
other. The pumps can produce flow to either the
forwardsideo
f the motors or to the reverse side of
the motors. The pumps can vary the amount of flow in
either direction in order to produce infinitely variable
speed capabi
lities. To turn the machine, each pump
is capable of reducing flow independently. This allows
one track to be driven at a slower speed in order to
cause the ma
chinetoturn.
Slowing the machine or stopping the machine is done
by reducing
the flow of oil to the drive motors or by
stopping the flow of oil to the drive motors. Braking
of the machine is caused by hydrostatic braking of
the tracks
.
The parking brakes are engaged while the brake
pedal (1) i
s fully depressed. The parking brakes are
engaged in the following conditions: parking brake
switch ON , the transmission control NEUTRAL, and
the engin
eOFF.
The parking brakes are attached to the final drives.
The parki
ng brake is spring-applied and oil pressure
released. The engine must be running in order to
release the parking brakes.
The parking brakes disengage when switch (3) is
moved from ENGAGED position. The parking brakes
also dis
engage when brake pedal (1) is released.
General Operational Safety Tips
The seat belt must be fastened at all times.
For a p
rompt stop, quickly depress decelerator/brake
pedal (1) or quickly move lever (2) to the NEUTRAL
position. Either movement causes an immediate stop.
For all turns that are on level ground or on side
hill operations, move lever (2) toward the RIGHT
posi
tion for right turns. Move lever (2) toward the
LEFT position for left turns.
Brak
es are applied under the following conditions.
•
Pedal (1) is fully depressed.
•
Steering and transmission control (2) is in
NEUTRAL.
•
Parking brake switch (3) is in the ENGAGED
position.
•
The engine is OFF.
Operating Principle for the Winch
g0126139
1
Illustration 92
(5) W inch control lever
(6) Winc h freespool sw itch
(7) W inch drive awa y switch
The winc
h for this Caterpillar machine is a
hydraulically driven winch that utilizes a dedicated
piston pump for power input. The winch includes
both pla
netary gears and standard spur gears. The
winch brake is applied by spring pressure. This will
secu re the load while control lever (5) is in the HOLD
positi
on. The winch brake is released hydraulica lly.
The winch case is designed to bolt directly to the rear
of the machine.
When the winch is operated in either the REEL IN or
theREELOUTdirection,ahydraulicmotordrives
the ge
ar train. The control lever supplies oil to the
winch motor by the hydrostatic control system. The
control lever for the winch is a proportionate control.
The a
mount of hydraulic oil that will be sent to the
winch motor will increase as lever (5) is moved. The
speed of the winch cable increases as the amount of
hydr
aulic oil to the winch motor increases. The winch
brake will be released by pilot pressure when lever
(5) is moved into either the REEL IN or the REEL
OUT d
irections.
The mechanism for the free spool for the winch is a
spl
ined gear. The mechanism for the free spool is
spring-engaged and hydraulically released. Press
the freespool switch once in order to activate the
fre
espool function. Then, hydraulic oil is ported
through the logic valve for the winch. The hydraulic oil
flows from the logic valve for the winch into a cylinder
fo
r the freespool mechanism. This will force the
piston for the freespool mechanism against the coil
spring. This will disengage the splined connection.
Th
isallowsthewinchcabletobepulledoffthewinch
drum by hand.