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60, 90, and 125 Skid-Steer Loaders
30-200-5
Hydrostatic Drive Operation-125 Loader
FLYWHEEL
SPLINED MDUNTING
HUB PLATE
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FLYWHEEL
HOUSING
CSM951
Engine power is transmitted to the hydrostatic, variable-
displacement-piston pumps. This is achieved by coupling
the rear hydrostatic pump input shaft with a splined hub
that is bolted to the engine flywheel.
PUMP
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CSM73'S
The front pump is coupled in tandem to the rear pump by
a splined input shaft. Each pump is connected by hose-
routing to a fiXed-displacement-piston hydrostatic motor.
Hydraulic fluid isdrawn bythe pumps from the oilreservoir
through a filter. The pumps then deliver the fluid, under
pressure, to the motors through the dark colored hoses.One
hose is for forward motion and one is for rearward motion.
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A sprocket on the output shaft of each motor is connected
to the axles by a two-step chain drive, in order to obtain four-
wheel drive. Each side of the loader houses a 9-D.S.-gallon
hydraulic reservoir that also acts as a chain case to lubricate
the drive chains.
A neutral-start safety switch prevents the Model 125 from
being started while the T -bar control lever is activated.
Hydraulics
The hydraulic power for loader operation is supplied by a
15-gpm,gear-type pump on the 125and a 7.5-gpmpump on
the 60 and 90. The hydraulic system has a 1500-psirelief
setting on the 60;1750-psion the 90;and 2000-psion the 125.
The standard spool valve directs oil flow to the lift and tilt
cylinders by actuating the foot pedals. The left pedal con-
trols the up and down motion of the boom,with a heel-toe
movement; and the right pedal controls the bucket, in the
same fashion. The boom pedal (left) can be pushed down
with the toe and locked in a detent position, allowing the
boom to float with the contour of the ground when back-
dragging with the bucket. An auxiliary hydraulic valve kit
can be ordered as an attachment for field conversion. This
kit is standard on 125 (SNI20,OOI- ). This valve is
used to operate front-mounted attachments requiring hy-
draulic power.