Cub Cadet 310-3000 - Manual (Page 5)

310-3000 IHT 1
HYDRAULIC SCHEMATIC
Figure 1 provides an illustration of the hydrau-
lic oil circuit. The oil supply for the hydraulic
system of the 310-3000 IHT is also utilized for
the lu bri ca tion of the planetary differential drive
gears.
The input shaft and pump cylinder block are
turned in one direction only by the engine/drive
belt/pul ley com bi na tion. Output of the oil fl ow
is con trolled by the direction and amount that
the swashplate is angled. As the pump pistons
com press they force the oil to fl ow through one
of two pas sage ways (forward or reverse) in
the center section (or valve body) to the motor
cylinder block and motor shaft. Since the mo-
tor has a fi xed dis place ment angle it is forced
to turn with the fl ow of oil. As the angle of the
swashplate is in creased the amount of oil being
pumped will increase and cause a higher RPM
output of the motor. Re vers ing the angle of the
pump swashplate will re verse the direction of
oil fl ow.
During the operation of the transaxle, fl uid
is “lost” from the hydraulic loop through leak
paths de signed into the product for lubrication
pur pos es (around pistons, under the rotating
cylinder blocks, etc.). This “lost” fl uid returns
to the trans mis sion housing and must be made
up in the loop. A charge pump is included on
the 310-3000 IHT to supply this makeup fl ow.
The make up fl ow is controlled (or directed) by
the check valves. Each check valve will either
be held opened or closed (depending upon the
direction of vehicle op er a tion) by the system
operating pressure (closed) or by charge pres-
sure (open) from the charge pump.
The charge pump maintains a continuous fl ow
of oil as long as the input shaft is turning. All
of the oil being pulled into the charge pump
fi rst must pass through an internal fi lter. Any
oil not needed by the transmission for make
up fl ow is
Figure 1. 310-3000 Hydraulic Flow Illustration
310-3000 IHT