Cub Cadet ZD - Manual (Page 5)

2 EZT ®
of the swashplate reverses the flow of oil from
the pump and thus reverses the direction of the
motor output rotation. The pump and motor are
of the axial piston design and utilize spherical
nosed pistons which are held against a thrust
race by internal compression springs.
The EZT has a self contained fluid supply and
an internal filter. The fluid is forced through
the filter by a positive “head” on the fluid in the
housing/expansion tank with an assist by the
negative pressure created in the pump pistons
as they operate.
The check valves in the center section are used
to control the make-up flow of the fluid to the
low pressure side of the loop.
A cam style, block lifting bypass is utilized in
the EZT to permit moving the vehicle for a short
distance at a maximum of 2 m.p.h. (3.2 Km/h)
without starting the engine.
warning
actuating the bypass will result in the
loss of hydrostatic braking capacity. The
machine must be stationary on a level
surface and in neutral when actuating
the bypass.
inTroducTion
The purpose of this manual is to provide infor-
mation useful in servicing the Hydro-Gear ® Inte-
grated Zero-Turn Transaxle (EZT ® ). This man-
ual includes the EZT’s general descriptions,
hydraulic schematics, technical specifications,
servicing and troubleshooting procedures.
The transaxle normally will not require servic-
ing during the life of the vehicle in which it is
installed. Should other servicing be required,
the exterior of the transaxle will need to be
thoroughly cleaned before beginning most
procedures. Do not wash the transaxle while
it is hot. do not use a pressure washer to
clean the unit.
gEnEral dEscripTion
The EZT is a self contained unit designed for
the transfer and control of power. It provides an
infinitely variable speed range between zero
and maximum in both forward and reverse
modes of operation.
This transaxle uses a variable displacement
pump with a maximum displacement of 10cc
per revolution, and motor with a fixed dis-
placement of 10cc per revolution. The vari-
able displacement pump features a trunnion
mounted swashplate with a direct-proportional
displacement control. Reversing the direction
sEcTion 1. dEscripTion and opEraTion
figure 1. Hydraulic schematic