User guide

2 T2
®
The T2 has a self contained uid supply and
an internal lter. The uid is forced through
the lter by a positive “head” on the uid 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 ow of the uid to the low
pressure side of the loop.
A block lifting bypass is utilized in the T2 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 T2 utilizes an in-line
oating disc brake controlled by a “cam” style
actuating arm.
INTRODUCTION
The purpose of this manual is to provide infor-
mation useful in servicing the Hydro-Gear
®
T2
®
Integrated Hydrostatic Transaxle. This manual
includes the T2’s general description, hydraulic
schematic, technical specications, 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 T2 is a self contained unit designed for the
transfer and control of power. It provides an in-
nitely 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 8cc
per revolution, and motor with a fixed dis-
placement of 10.2cc 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 ow 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.
DESCRIPTION AND OPERATION