Service Manual

THEORY OF OPERATION
5xi Series Tractor Hydraulic Service Manual 2 - 3
2
The Eaton Model 11 hydrostatic transmission, as
used on the 5xi series, is equipped with an
internal charge pressure valve, forward and
reverse check and acceleration valves, and
vibration dampening pistons. The transmission
has a splined output shaft and keyed input shaft,
both of which are supported by ball bearings.
A charge pump is located externally on the
transmission case and is driven by the input
shaft. The charge pump provides pressurized oil
to the transmission, power steering, and lift
systems.
General Information
(A)
Radial Ball-Piston Pump.
(B)
Acceleration Valves.
(C)
Input Shaft.
(D)
Charge Pump - Charge pressure 30-90 PSI
(2.1 - 6.2 bar). Implement lift pressure 700-
800 PSI (48.2 - 55.2 bar) with manual
steering, 725 PSI (50 bar) with power
steering.
(E) Control Shaft - Controls transmission output speed and
direction of rotation - shaft points to the right when
installed in the 5xi transaxle.
(F) Dampening Pistons - Aids in quieter unit operation.
(G) Charge Pressure Relief Valve.
(H) Check Valve - Two used.
(I) Output Shaft.
(J) Radial Ball-Piston Motor.