310-0510 IHT
2
INTRODUCTION
The purpose of this manual is to provide
information useful in servicing the Hydro-Gear
®
Integrated Hydrostatic Transaxle (IHT). This
manual includes the IHT’s general description,
hydraulic schematic, technical specifications,
servicing and troubleshooting procedures.
The transaxle normally will not require servicing
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 310-0510 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 displace-
ment of 10cc per revolution. The variable dis-
placement pump features a trunnion mounted
swashplate with a direct-proportional displace-
ment 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 310-0510 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 makeup flow of the fluid to the low
pressure side of the loop.
A check ball lifting bypass is utilized in the 310-
0510 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 310-0510 utilizes an in-line floating disc
brake controlled by a “cam” style actuating arm.
SECTION 1. DESCRIPTION AND OPERATION
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.
Figure 1. 310-0510 Hydraulic Schematic
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