Cub Cadet G730 - Manual (Page 4)

2 G730
In this circuit, fluid is drawn from the case and
through the filter and into a fixed displacement
gerotor pump. Charge pump flow not used to
feed the low pressure side of the system is
passed over a charge relief valve and back into
the transaxle case.
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.
The G730 utilizes an in-line floating disc brake
controlled by a “cam” style actuating arm.
A cam style, block lifting bypass is utilized in the
G730 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. The brake must
be disengaged prior to actuating the bypass
mechanism.
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 in-
formation useful in servicing the Hydro-Gear ®
G730 ® Integrated Hydrostatic Transaxle.
This manual includes the G730’s general
descriptions, hydraulic schematics, technical
specifications, servicing and troubleshooting
procedures.
Other than recommended oil changes, the
transaxle normally will not require servicing dur-
ing the life of the vehicle in which it is installed.
Should other servicing be required, the exte-
rior 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 G730 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 16cc per revolution. The vari-
able displacement pump features a trunnion
mounted swashplate with a direct-proportional
displacement control. Reversing the direction
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 G730 transaxle has a self contained fluid
supply and external filter. The external filter
provides ease of access for oil maintenance of
the drive system. The G730 is designed with a
charged pressure circuit.
DESCRIPTION AND OPERATION