T2® / T2-HP
Integrated Hydrostatic Transaxle
Service and Repair Manual
BLN-52749
September 2010
TABLE OF CONTENTS
Foreword ............................... . . . .1
Description and Operation . . . . . . . . . . . . . . . . . . . . .2
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Hydraulic Schematic . . . . . . . . . . . . . . . . . . . . . . . . . .3
External Features . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Technical Specifications . . . . . . . . . . . . . . . . . . . . . . .6
Product Identification ...................... . . . .6
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Personal Safety .......................... . . . .7
Tool Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Work Area Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Servicing Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Troubleshooting .......................... . . . .8
Service and Maintenance . . . . . . . . . . . . . . . . . . . . . .9
External Maintenance ..................... . . . .9
Service and Maintenance Procedures . . . . . . . . . . . .9
Fluids .................................. . . . .9
RH Axle Shaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Bull Gear Set ............................ . . .25
Reduction Gear Set ....................... . . .26
Input Shaft .............................. . . .27
Swashplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Bypass Arm ............................. . . .29
Center Section, Motor Shaft & Motor Block . . . . . . .30
Filter Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Cylinder Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
LH Axle Shaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Expansion Tank Hose and Fitting . . . . . . . . . . . . . .33
Assembly after Teardown . . . . . . . . . . . . . . . . . . . . .34
Side Housing-Screw Sequence . . . . . . . . . . . . . . . .35
®
Transaxle Exploded View . . . . . . . . . . . . . . . . .36
T2
Glossary of Terms ........................38-39
Notes .................................. . . .40
Fluid Volume and Level .................... . . . .9
Fluid Change Procedure ................... . . .10
Purging Procedures ....................... . . .11
Return To Neutral Setting . . . . . . . . . . . . . . . . . . . . .12
Brake Maintenance ....................... . . .13
Friction Pack Adjustment ................... . . .13
Tear Down and Reassembly ................ . . .14
How to Use This Manual ................... . . .14
General Instructions . . . . . . . . . . . . . . . . . . . . . . . . .14
Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Torques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Transa xle Removal . . . . . . . . . . . . . . . . . . . . . . . . . .16
Fan and Pulley ........................... . . .17
Expansion Tank .......................... . . .18
Control Arm Assembly . . . . . . . . . . . . . . . . . . . . . . . 19
Return to Neutral Option ................... . . .20
Return to Neutral/ROS Assembly Option . . . . . . . . .21
Brake Arm & Brake Assembly ............... . . .22
Side Housing ............................ . . .23
®
i
T2
FOREWORD
Headquartered in Sullivan, Illinois,
Hydro-Gear® is a world leader in the design,
manufacture, and service of quality hydrostatic
transaxles for the lawn and garden industry.
The mission of our company is to be recognized by our customers and the industry as a
world-class supplier and the quality leader in
everything we do.
This Service and Repair Manual is designed
to provide information useful in servicing and
troubleshooting the Hydro-Gear T2
®
Integrated
Hydrostatic Transaxle.
Also included is a glossary of terms that are
frequently used throughout the industry and in
Hydro-Gear service publications. Understanding terminology is very important!
It is necessary, and a good shop practice, that
your service area be equipped with the proper
tools and the mechanics be supplied the latest
information available. All repair procedures
illustrated in this guide are suggested, but preferred methods of repair.
Internal repair procedures require that the
transaxle unit be removed from the vehicle.
This is not a certication, test or study guide for
a certication test. If a technician is interested
in certication, they should contact an agent
representing the EETC (Equipment and Engine
Training Council) at (262) 367-6700 or their
Hydro-Gear Central Service Distributor. Many
distributors will be hosting certication testing.
These study guides will cover most of the products and manufacturers in our industry.
For more information about Hydro-Gear or our
products, please contact your Central Service
Distributor, or call our Customer Service Department at (217) 728-2581.
®
1
T2
DESCRIPTION AND OPERATION
INTRODUCTION
The purpose of this manual is to provide information useful in servicing the Hydro-Gear
®
T2®
Integrated Hydrostatic Transaxle. This manual
includes the T2’s general description, hydraulic
schematic, technical specications, 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 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.
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.
This transaxle uses a variable displacement
pump with a maximum displacement of 8cc
per revolution, and motor with a fixed displacement of 10.2cc per revolution. The variable 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.
2 T2
®
DESCRIPTION AND OPERATION (CONTINUED)
HYDRAULIC SCHEMATIC
Figure 1 is a schematic of the hydraulic oil
circuit. The oil supply for the hydraulic system
of the T2® is also utilized for lubricating the
components of the nal drive assembly.
The input shaft and pump cylinder block are
turned in one direction only by the engine/drive
belt/pulley combination. Output of the oil ow is
controlled by the direction and amount that the
variable swashplate is angled. As the pump pis-
tons compress they force the oil to ow through
one of two passageways (forward or reverse) in
the center section to the motor cylinder block
and motor shaft. Since the motor has a xed
displacement angle it is forced to turn with the
ow of oil. As the angle of the pump swashplate
is increased the amount of oil being pumped will
increase and cause a higher speed output of the
motor. Reversing the angle of the swashplate
will reverse the direction of oil ow.
During the operation of the transaxle, uid
is “lost” from the hydraulic loop through leak
paths designed into the product for lubrication
purposes (around pistons, under the rotating
cylinder blocks, etc.). This “lost” uid returns
to the transaxle housing, then is pulled back
into one of the check valves depending upon
the direction of vehicle operation. All of this
oil must pass through an internal lter.
The motor cylinder block mounts onto a splined
motor shaft which drives the gear train.
The bypass feature in the T2 has a mechanical
lever which lifts the motor block off the center
section running surface. This allows oil ow
from the cylinder blocks to be discharged.
Figure 1, T2 Hydraulic Schematic
T2® 3
EXTERNAL FEATURES T2
RH Axle LH Axle
Oil Fill Plug
®
Bypass Arm
Control Arm
Input Shaft
Main HousingSide Housing
Expansion Tank
— Top View —
Input Shaft
Brake Arm
RH Axle LH Axle
Side Housing Main Housing
Control Arm
Expansion Tank
— Inboard View —
4 T2
®
EXTERNAL FEATURES T2
Expansion Tank
LH Axle
®
Bypass Arm
Control Arm
Bypass Arm
Brake Arm
— Outboard View—Left —
Pulley
Fan
Oil Fill Plug
Expansion Tank
RH Axle
Brake Rotor
— Outboard View—Right —
T2® 5
TECHNICAL SPECIFICATIONS
HYDRO-GEAR
T2-AABC-2X1A-1CXX T2-AABC-2X1A-1CXX
6 352 K1 476
Assembled in USA
BOM Model Number
Year Built
Date (Julian- Day of year)
Serial Number (unique for that model - for that day)
Type of Product and Build Information
Sales Drawing Number
T2® TECHNICAL SPECIFICATIONS
Overall Transaxle Reduction
Input Speeds
Maximum Hi-Idle (No Load)
Minimum
Output Torque
Peak
Continuous
Weight on Tires (per unit)
Maximum with 16” tires
Maximum with 18” tires
Maximum with 20” tires
395 lb-ft (536 N-m)
105 lb-ft (142 N-m)
540 lb (245 kg)
T2 T2-HP
20.6 22.7 25.3
3000 rpm
1800 rpm
—
—
425 lb-ft (576 N-m)
115 lb-ft (156 N-m)
—
500 lb (227 kg)
—
500 lb-ft (678 N-m)
145 lb-ft (196 N-m)
—
—
540 lb (245 kg)
Axle Shaft Diameter
Axle Shaft End Options
Parking Brake Type
Weight of Unit
Maximum Tire Diameter
16 in (406 mm) 18 in (457 mm) 20 in (508 mm)
.75 in (19.05 mm)
Keyed or Two Flats
Disc
28 lb (12.7) kg
PRODUCT IDENTIFICATION
The model and conguration of the T2 can be determined from the label shown below.
6 T2
Figure 2, Conguration Label
®
SAFETY
This symbol points out important safety
instructions which, if not followed, could endanger the personal safety and/or property of
yourself and others. Read and follow all instructions in this manual before attempting maintenance on your transaxle. When you see this
symbol - HEED ITS WARNING.
Wear appropriate clothing. Loose or hanging
clothing or jewelry can be hazardous. Use the
appropriate safety equipment, such as eye
and hearing protection, and safety-toe and
slip-proof shoes.
Never use compressed air to clean debris from
yourself or your clothing.
TOOL SAFETY
WARNING
POTENTIAL FOR SERIOUS INJURY
Inattention to proper safety, operation, or
maintenance procedures could result in
personal injury, or damage to the equipment. Before servicing or repairing the
T2® transaxle, fully read and understand
the safety precautions described in this
section.
PERSONAL SAFETY
Certain safety precautions must be observed
while servicing or repairing the T2. This section
addresses some of these precautions but must
not be considered an all-inclusive source on
safety information. This section is to be used in
conjunction with all other safety material which
may apply, such as:
1. Other manuals pertaining to this machine,
2. Local and shop safety rules and codes,
3. Governmental safety laws and regula-
tions.
Be sure that you know and understand the
equipment and the hazards associated with it.
Do not place speed above safety.
Use the proper tools and equipment for the
task.
Inspect each tool before use and replace any
tool that may be damaged or defective.
WORK AREA SAFETY
Keep the work area neat and orderly. Be sure
it is well lit, that extra tools are put away, trash
and refuse are in the proper containers, and dirt
or debris have been removed from the working
areas of the machine.
The oor should be clean and dry, and all extension cords or similar trip hazards should be
removed.
SERVICING SAFETY
Certain procedures may require the vehicle to
be disabled in order to prevent possible injury
to the servicing technician and/or bystanders.
The loss of hydrostatic drive line power may
result in the loss of hydrostatic braking capability.
Some cleaning solvents are ammable. Use
only approved cleaning materials: Do not use
explosive or ammable liquids to clean the
equipment.
Notify your supervisor whenever you feel there
is any hazard involving the equipment or the
performance of your job.
Never allow untrained or unauthorized personnel to service or repair the equipment.
T2® 7
To avoid possible re, do not use cleaning
solvents in an area where a source of ignition
may be present.
Discard used cleaning material in the appropriate containers.
TROUBLESHOOTING
In many cases, problems with the T2® are not
WARNING
Do not attempt any servicing or adjustments with the engine running.
Use extreme caution while inspecting
the drive belt assembly and all vehicle
linkage!
Follow all safety procedures outlined in
the vehicle owner’s manual.
TROUBLESHOOTING CHECKLIST
Possible Cause Corrective Action
Unit Operates In One Direction Only
Control linkage bent or out of adjustment Repair or replace linkage, Page 9
Drive belt slipping or pulley damaged Repair or replace drive belt or pulley, Page 9
Vehicle Does Not Drive/Track Straight
Vehicle tires improperly inated Refer to vehicle manufacturer suggested pressure
Control linkage bent or out of adjustment Repair or replace linkage, Pages 9 and 12
Bypass assembly sticking Repair or replace bypass, Page 29
Brake Partially Engage Disengage Brake, Replace Broken or Missing Brake Return Spring
Unit Is Noisy
Oil level low or contaminated oil Fill to proper level or change oil, Page 10
Excessive loading Reduce vehicle loading, Page 9
Loose parts Repair or replace loose parts
Bypass assembly sticking Repair or replace linkage, Page 9
Air trapped in hydraulic system Purge hydraulic system, Page 11
Brake Partially Engage Disengage Brake, Replace Broken or Missing Brake Return Spring
Unit Has No/Low Power
Engine speed low Adjust to correct setting
Control linkage bent or out of adjustment Repair or replace linkage, Page 9
Drive belt slipping or pulley damaged Repair or replace drive belt or pulley, Page 9
Oil level low or contaminated oil Fill to proper level or change oil, Page 10
Excessive loading Reduce vehicle loading, Page 9
Bypass assembly sticking Repair or replace linkage, Page 9
Air trapped in hydraulic system Purge hydraulic system, Page 11
Brake Partially Engage Disengage Brake, Replace Broken or Missing Brake Return Spring
Unit Is Operating Hot
Debris buildup around transaxle Clean off debris, Page 9
Cooling fan damaged Repair or replace cooling fan, Pages 17
Oil level low or contaminated oil Fill to proper level or change oil, Page 10
Excessive loading Reduce vehicle loading, Page 9
Air trapped in hydraulic system Purge hydraulic system, Page 11
Brake Partially Engage Disengage Brake, Replace Broken or Missing Brake Return Spring
Transaxle Leaks Oil
Damaged seals, housing, or gaskets Replace damaged components
Air trapped in hydraulic system Purge hydraulic system, Page 11
8 T2
related to a defective transaxle, but are caused
by slipping drive belts, partially engaged bypass valves, and loose or damaged control
linkages. Be sure to perform all operational
checks and adjustments outlined in Service and
Maintenance, before assuming the transaxle
is malfunctioning. The table below provides a
troubleshooting checklist to help determine the
cause of operational problems.
®
SERVICE AND MAINTENANCE
NOTE: Any servicing dealer attempting a
warranty repair must have prior
approval before conducting maintenance of a Hydro-Gear® product
unless the servicing dealer is a current Authorized Hydro-Gear Service
Center.
EXTERNAL MAINTENANCE
Regular external maintenance of the T2® should
include the following:
1. Check the vehicle operator’s manual for
the recommended load ratings. Insure
the current application does not exceed
load rating.
2. Check oil level in accordance with Figure 3
Page 10.
3. Inspect the vehicle drive belt, idler pulley(s),
and idler spring(s). Insure that no belt
slippage can occur. Slippage can cause low
input speed to the transmission.
SERVICE AND MAINTENANCE
PROCEDURES
All the service and maintenance procedures
presented on the following pages can be
performed while the T2 is mounted on the
vehicle. Any repair procedures as mentioned
in the repair section of this manual must be
performed after the unit has been removed
from the vehicle.
FLUIDS
The uids used in Hydro-Gear products have
been carefully selected, and only equivalent, or
better products should be substituted.
Typically, an engine oil with a minimum rating
of 9.0 cSt (55 SUS) at 230°F (110° C) and an API
classication of SL is recommended. A 20W-50
engine oil has been selected for use by the factory
and is recommended for normal operating
temperatures.
FLUID VOLUME AND LEVEL
4. Inspect the transmission cooling fan for
broken or distorted blades and remove any
obstructions (grass clippings, leaves, dirt,
etc.).
5. Inspect the axle parking brake and vehicle
linkage to insure proper actuation and
adjustment of the parking brake.
6. Inspect the vehicle control linkage to the
directional control arm on transaxle. Also,
insure the control arm is securely fastened
to the trunnion arm of the transaxle.
7. Inspect the bypass mechanism on the
transaxle and vehicle linkage to insure it
actuates and releases fully.
Fluid volume information is provided in the
Table below.
Certain situations may require additional uid
to be added or even replaced. Refer to Page
10, Figure 3 and pages 4 and 5 for the proper
ll port location.
Fill the T2 to the bottom of the oil fill port
threads.
Recheck the uid level once the unit has been
operated for approximately 1 minute.
Purging may be required. Refer to the purging
procedures on page 11.
Fluid Description
Type: 20W50 motor oil
Fluid Volume (per transaxle)
10 Bolt Housing: 69.3 - 65.9 .oz. (2050 - 1950 ml)
14 Bolt Housing: 72.8 - 69.4 . oz. (2155 - 2055 ml)
T2® 9
FLUID CHANGE PROCEDURE
This transaxle is factory lled, sealed and does
not require oil maintenance. However, in the
event of oil contamination or degradation, oil
addition or change may alleviate certain performance problems.
1. Remove the transaxle from the vehicle.
2. Clean the expansion tank and oil ll port
areas of any debris.
3. Remove the oil ll port tting.
4. Position the transaxle so the oil will drain
completely out of the housing.
5. After all the oil is drained from the transaxle,
remove the expansion tank by removing the
self tapping bolt (10-32 x ½) and ratchet
fastner that holds the tank to the housing.
6. Remove the tank and drain the oil from the
tank. DO NOT remove the vent cap from the
tank. DO NOT remove the tank hose or
o-ring unless a replacement is needed.
7. Install the tank by rst inserting the hose
into the opening in the expansion tank.
Push the tank opening over the o-ring to
ensure a proper seal.
8. Install the tank and self tapping bolt making
sure not to cross thread the bolt. Torque the
bolt to the lower value of the torque speci-
cation listed in the Table on page 15.
9. Fill the transaxle at the oil ll port according
to Figure 3.
10. Install the oil ll port tting.
EXPANSION TANK FUNCTION
The expansion tank allows the T2™ to operate
free of air entrainment and provides maximum
lubrication to the mechanical and hydraulic
components in the transaxle.
As the T2 transaxle is operated, oil in the
transaxle housing heats up which causes the
oil to expand. The oil ows through an internal
hose to the bottom of the vented expansion
tank. As the oil cools, the oil in the transaxle
housing contracts, causing the oil level to go
down in the housing. This creates a negative pressure in the housing causing the oil
to be drawn back into the case. This keeps
the transaxle housing full of oil at specied
operating temperatures.
Top of Fill Port
1.25”
Oil Level
.50”
Oil Volume:
2050 ml (69.3 fl. oz.)
1950 ml (65.9 fl. oz.)
Figure 3, Expansion Tank
10 T2
Expansion Tank
®
PURGING PROCEDURES
Due to the effects air has on efficiency in
hydrostatic drive applications, it is critical that
it be purged from the system.
These purge procedures should be implemented any time a hydrostatic system has
been opened to facilitate maintenance or any
additional oil has been added to the system.
Air creates inefciency because its compression and expansion rate is higher than that of
the oil approved for use in hydrostatic drive
systems.
The resulting symptoms in hydrostatic systems
may be:
1. Noisy operation.
2. Lack of power or drive after short term
operation.
3. High operation temperature and excessive
expansion of oil.
The following procedures should be performed
with the vehicle drive wheels off the ground,
then repeated under normal operating conditions.
1. With the bypass valve open and the engine
running, slowly move the directional control
in both forward and reverse directions
(5 to 6 times), as air is purged from the unit,
the oil level will drop.
2. With the bypass valve closed and the
engine running, slowly move the directional
contr ol i n both forwa rd a nd r ev er se
directions (5 to 6 times). Check the oil level,
and add oil as required after stopping
engine.
3. It may be necessary to repeat Steps 1 and 2
until all the air is completely purged from the
system. When the transaxle moves forward
and reverse at normal speed purging is
complete.
Before starting, make sure the transaxle/trans-
mission is at the proper oil level. If it is not, ll
to the specications outlined on page 9.
T2® 11
RETURN TO NEUTRAL SETTING
WARNING
POTENTIAL FOR SERIOUS INJURY
Certain procedures require the vehicle engine
to be operated and the vehicle to be raised off
the ground. To prevent possible injury to the servicing technician and/or bystanders, insure the
vehicle is properly secured.
The return to neutral mechanism on the transmission is designed to set the directional control into a neutral position when the operator
removes their foot from the foot control. Follow
the procedures below to properly adjust the
return to neutral mechanism on the transaxle:
1. Conrm the transaxle is in the operating mode
(bypass disengaged). Raise the vehicle’s drive
tires off the ground to allow free rotation.
NOTE: It may be necessary to remove the
drive tire from the axle hub to access
the linkage control and the transaxle
return arm.
2. Remove the Original Equipment Manufacturer’s (OEM’s) control linkage at the control
arm. Refer to Figure 4.
WARNING
Do not attempt any adjustments with the
engine running. Use extreme caution while
inspecting all vehicle linkage!
Follow all safety procedures outlined in the
vehicle owner’s manual.
3. Start the engine and increase the throttle to
full engine speed.
4. Check for axle rotation. If the axles do not
rotate, go to Step 5. If the axles rotate, go
to Step 6.
5. Stop the vehicle’s engine. Reattach and
adjust the OEM linkage according to
the OEM manual. Recheck according to
Step 3 and 4. Stop the vehicle engine.
Refer to Figure 4.
6. Note the axle directional movement. Stop
the vehicle engine. Loosen the lock down
screw (168) until the control arm (160) can
be rotated. Rotate the control arm in the
same direction of the wheel rotation in small
increments. Tighten the lock down screw.
Recheck according to steps 3 and 4. Refer
to Figure 4.
Spring (167)
Screw (41)
RTN Control Arm (160)
Lock Down Screw (168)
Bushing (165)
Scissor Arm (162)
RTN Neutral Arm (161)
Figure 4, Return to Neutral
12 T2
®
BRAKE MAINTENANCE
BRAKE SETTING
1. Remove the brake arm bias spring(134),
and then the cotter pin (133) securing the
brake castle nut (132).
2. Insert a 0.020” feeler gage between the
brake rotor (121) and top brake puck, and
then set the brake by nger tightening or
loosening the castle nut.
3. Install a new cotter pin to secure the castle
nut, and then install the brake arm bias
spring.
(130)
FRICTION PACK ADJUSTMENT
The friction pack dampens or holds the operator
control lever in its desired position.
Adjustment for the amount of drag or holding
force can be made by turning the friction pack
nut in or out.
Adjustments should be made in no more than
1/4 turn increments.
Over-tightening will result in difculty or inability
of the operator to move the control lever.
NOTE: The factory setting for the friction
pack is tightening of the friction pack
nut to 100 in-lbs (11 Nm) torque. The
friction pack nut is then backed off
per the vehicle manufacturer’s
specications.
(134)
(132)
(121) (124)
(133)
Figure 5, Brake Setting
Friction Pack Nut
Figure 6, Friction Pack Adjustment
T2® 13
TEAR DOWN AND REASSEMBLY
HOW TO USE THIS MANUAL
Each subassembly illustrated in this section
is illustrated by an exploded view showing
the parts involved. The item reference num-
bers in each illustration are for assembly
instructions only. See page 37 for part names
and descriptions. A complete exploded view
and item list of the transaxle is provided on
pages 36 and 37.
Many of the parts and subassemblies of this
transaxle can be removed and serviced independently of other components. Where some
components and assemblies must be removed
before a given assembly can be serviced, that
information is given at the beginning of the
disassembly instructions.
GENERAL INSTRUCTIONS
Cleanliness is a primary means of assuring
satisfactory life on repaired units. Thoroughly
clean all exposed surfaces prior to any type
of maintenance. Cleaning of all parts by using a solvent wash and air drying is usually
adequate. As with any precision equipment, all
parts must be kept free of foreign material and
chemicals.
Protect all exposed sealing surfaces and open
cavities from damage and foreign material. The
external surfaces should be cleaned before
beginning any repairs.
®
Hydro-Gear
replacement parts found listed in
BLN-51427 (CD).
IMPORTANT: When internal repair is performed on the T2
®
, the lter assembly must be
replaced.
TRANSAXLE REMOVAL
It is n ec es sa ry t o remov e the T2 from
the vehicle before performing the repair
procedures presented in this section.
LIMITED DISASSEMBLY
The following procedures are presented in
the order in which they must be performed to
completely disassemble the unit. Do not
disassemble the unit any farther than is
necessary to accomplish the required repairs.
Each disassembly procedure is followed by a
corresponding assembly procedure.
Reassembly is accomplished by performing
the “Assembly” portions of the procedures. If
the unit has been completely disassembled, a
summary of the assembly procedures, in the
order in which they should occur, is given on
page 34.
Upon removal, it is recommended that all seals,
O-rings, and gaskets be replaced. During
installation lightly lubricate all seals, O-rings,
gaskets with a clean petroleum jelly prior to
assembly. Also protect the inner diameter of
seals by covering the shaft with a cellophane
(plastic wrap, etc.) material. Be sure all remnants of this covering are removed after servicing.
Parts requiring replacement must be replaced
from the appropriate kits identied in the Items
Listing, found on page 37. Use only original
14 T2
®
TOOLS
REQUIRED TOOLS
Miscellaneous Sockets
Flat Blade Screw Driver (2) 1/2”-3/8” Adapter
Torque Wrench 1/2” Deep
Air Impact Wrench 7/16” Deep
Rubber or Neoprene Mallet 3/4” Deep
Breaker Bar 7/8” Deep
Side Cutters/Snips 9/16” Deep
Needle Nose Pliers T-40 Torx Head
Large External Snap Ring Pliers 10 mm
Small Internal Snap Ring Pliers
TORQUES
REQUIRED TORQUE VALUES
Item Description Torque Operation
8 HFHCS 1/4-20 x 1.25 105-155 in-lbs [11.8-17.5 Nm] Housing screw
13 Plug 9/16-18 (Metal) 180-240 in-lbs [20.3-27.1 Nm] Fill plug
22 Bolt, Hex Flange, 3/8-16, CS 525-700 in-lbs [59.3-79.1 Nm] Center section bolt
24 Check plug 280-400 in-lbs [31.6-45.2 Nm] Check plugs
25 Check plug 280-400 in-lbs [31.6-45.2 Nm] Check plugs
41 TWHCS 5/16-18 x 1 230-310 in-lbs [25.9-35.0 Nm] Trunnion arm screw
43 Screw, set 5/16-24 x 2.50 135-155 in-lbs [15.2-17.5 Nm] Control arm stud
49 Nut, hex 5/16-24 nylon insert 85-120 in-lbs [9.6-13.5 Nm] Friction Pack Nut
127 HFHCS 1/4-20 x 2.0 w/ patch 80-120 in-lbs [9.0-13.5 Nm] Brake yoke screw
128 HHCS 1/4-20 x 1 (patch) 80-120 in-lbs [9.0-13.5 Nm] Brake yoke screw
140 5/16 SAE, 5/32 tube 96-120 in-lbs [10.8-13.5 Nm] Expansion tank tting
144 Bolt, self-tapping 10-32 x 0.5 25-40 in-lbs [2.8-4.5 Nm] Expansion tank screw
152 Nut, Hex Lock 1/2-20 360-520 in-lbs [40.7-58.8 Nm] Fan Nut
153 HFHCS 1/4-20 x 0.75 50-80 in-lbs [5.7-9.0 Nm] Fan Screws
162 Screw, Hex Flange Head 85-120 in-lbs[9.6-13.5 Nm] Neutral Assy Arm Screw
As a general rule, use the low end of the torque spec on fasteners when reassembling the unit.
T2® 15
TRANSAXLE REMOVAL
NOTE: It is necessary to remove the T2® from
the vehicle before performing the repair
procedures presented in this section.
Before starting any disassembly, make
certain that your work area is neat and
clean. Clean the external parts of the
transaxle.
The following procedures are pre-
sented in the order recommended for a
complete tear down of the transaxle.
Do not disassemble the unit any far-
ther than necessary to accomplish the
required repairs.
Reassembly is accomplished by per-
forming the “Assembly” portions of the
procedures. If the unit has been completely disassembled, a summary of
the assembly procedures, in the order
in which they should occur, is given on
page 34.
Figure 7, T2 Transaxle
16 T2
®
FAN AND PULLEY
Refer to Figure 8
PULLEY AND FAN CONFIGURATION
1. Remove the locknut (152), and detach the
fan and pulley assembly from the input
shaft.
2. Separate the assembly by removing the
screws (153), fan (150) and the pulley
(151).
nspection
I
1. Check all components for wear or damage.
Replace if necessary.
Assembly
1. Reassemble all parts in the reverse order
of disassembly.
2. When tightening the fasteners, refer to the
table on page 15 for the required torque
values.
Refer to Figure 9
FAN AND PULLEY CONFIGURATION
1. Remove the locknut (152) and washer
(153).
2. Remove the fan (150) and the pulley
(151).
Inspection
1. Check all components for wear or damage.
Replace if necessary.
Assembly
1. Reassemble all parts in the reverse order
of disassembly.
2. When tightening the fasteners, refer to the
table on page 15 for the required torque
values.
NOTE: As a general rule, use the low end of
the torque specication on fasteners
when reassembling the unit.
152
151
150
153
152
153
150
151
Figure 8, Fan on bottom conguration Figure 9, Fan on top conguration
T2® 17
EXPANSION TANK
Refer to Figure 10
Disassembly
1. Remove all items previously discussed in
their recommended order.
2. Remove the ratchet fastener (147) and
discard.
3. Detach the tube (145) from the tank tting
(146). The tting (146) does not need to be
removed – unless, replacing.
4. Remove the screw (144) from the expansion
tank.
5. Remove the tank (143). Do not remove the
hose (141) at this time.
147
145
Inspection
1. Inspect all parts for wear or damage. Replace if necessary.
Assembly
1. Reassemble all parts in the reverse order
of disassembly.
2. When tightening the fasteners, refer to the
table on page 15 for the required torque
values.
NOTE: As a general rule, use the low end of
the torque specication on fasteners
when reassembling the unit.
144
143
146
141
Figure 10, Expansion Tank
18 T2
®
CONTROL ARM ASSEMBLY
Refer to Figure 11
Disassembly
1. Remove all items previously discussed in
their recommended order.
2. If opening the housing or replacing seals,
remove the oil port plug (13), then; drain oil
from transaxle.
3. Remove the lock nut (49), the washer (46),
the helical comp spring (48), the spacer
(47), the (second) washer (46), and the
plastic washer (45).
4. Remove the Torx head screw (41) and discard.
5. Remove the control arm (42), the (second)
washer (45), the belleville washer (44), and
and the set screw (43).
Inspection
Assembly
1. Reassemble all parts in the reverse order
of disassembly.
2. When tightening the fasteners, refer to the
table on page 15 for the required torque
values.
3. Install new Torx head screw (41) and lip seal
(110) from seal kit, if removed.
NOTE: As a general rule, use the low end of
the torque specication on fasteners
when reassembling the unit.
1. Inspect all parts for wear or damage. Replace if necessary.
49
46
48
47
46
41
45
42
45
44
43
110
NOTE: Only remove the seal (110) if do-
ing a complete disassembly or if
the seal is worn or damaged.
13
Figure 11, Control Arm
T2® 19
RETURN TO NEUTRAL ASSEMBLY OPTION
Refer to Figure 12
Disassembly
1. Remove all items previously discussed in
their recommended order.
2. Remove the spring (167).
3. Remove the Torx head screw (41) and discard.
4. Remove the scissor arm (164), and the RTN
control arm (161).
5. Remove the Hex ange head screw (162),
the bushing (166) and the RTN neutral arm
(165).
NOTE: Only remove the seal (110) if damaged
or worn, or if doing a complete disassembly. Refer to “Seal Kit” in the Items
List on page 37.
Inspection
1. Inspect all parts for wear or damage. Replace if necessary.
Assembly
1. Reassemble all parts in the reverse order
of disassembly.
2. When tightening the fasteners, refer to the
table on page 15 for the required torque
values.
3. Install new Torx head screw (41) and lip seal
(110) from seal kit.
NOTE: As a general rule, use the low end of
the torque specication on fasteners
when reassembling the unit.
41
162
166
164
167
20 T2
161
165
110
Figure 12, Return to Neutral Assembly
®
RETURN TO NEUTRAL/ROS ASSEMBLY OPTION
Refer to Figure 13
Disassembly
1. Remove all items previously discussed in
their recommended order.
2. Remove the spring (167).
3. Remove the Torx head screw (41), discard,
and the washer (163).
4. Remove the scissor arm (164), and the RTN
control arm (160).
5. Remove the Hex ange head screw (162),
the bushing (166) and the RTN neutral arm
(165).
Inspection
1. Inspect all parts for wear or damage. Replace if necessary.
Assembly
1. Install the neutral arm (165).
2. Install the bushing (166) and the hex head
screw (162).
3. Install the control arm (160).
4. Install the RTN scissor arm (164), washer
(163) and Torx head screw (41). Refer to
torque chart on page 15.
5. Install the switch retainer over the neutral
arm tab. Place the rivet through the switch
retainer and neutral arm.
6. Install the RTN spring (167).
7. Press down on the switch retainer tab to bias
it. Ensure that the rivet is seated. Then set
the rivet using a rivet gun.
8. Refer to page 12 for adjusting the RTN assembly.
NOTE: After installing the transaxle on the
vehicle be sure the operator presence
system and the reverse operation
system (ROS) are working properly.
Refer to the operations and maintenance sections in the vehicle owner’s
manual.
165
166
160
164
163
41
Actuator clip
T2® 21
162
RCS switch
167
Figure 13, Return to Neutral/ROS Assembly
Switch retainer
BRAKE ARM & BRAKE ASSEMBLY
Refer to Figure 14
Disassembly
Inspection
1. Remove all items previously discussed in
their recommended order.
2. Remove the cotter pin (133) and discard.
Mark the orientation of the bias spring (134),
and long screw (127). Remove the brake
arm spring (134), the castle nut (132), and
the washer (131).
3. Remove the brake arm (130), and the brake
compression spring (129).
4. Remove the bolt (128), the bolt (127), and
the spacer (126).
5. Remove the brake yoke (124), the puck
plate (122), and the brake puck (120).
6. Remove the two brake pins (125) from the
brake yoke (124).
7. Remove the brake rotor (121), the inner
puck (120) and the seal (7) and discard.
1. Inspect all parts for wear or damage. Replace if necessary.
Assembly
1. Reassemble all parts in the reverse order
of disassembly.
2. When tightening the fasteners, refer to the
table on page 15 for the required torque
values.
3. Install new cotter pin (133) and lip seal (7)
from seal kit.
NOTE: As a general rule, use the low end of
the torque specication on fasteners
when reassembling the unit.
NOTE: Only remove the seal (7) if damaged
or worn, or if doing a complete disassembly. Refer to “Seal Kit” in the Items
List on page 37.
7
120
121
Figure 14, Brake Assembly
120
124
122
125
126
127
125
129
130
128
134
131
132
133
22 T2
®
SIDE HOUSING
Refer to Figure 15
Disassembly
1. Remove all external items previously discussed in their recommended order.
2. Remove the screws (8), separate side housing (2) from main housing (1).
Inspection
1. Inspect the bearing and bushing areas in the
side cover for wear or damage. Replace if
necessary.
Assembly
1. Reassemble all parts in the reverse order
of disassembly.
2. Apply a bead of sealant around the perim-
eter of the main housing face. See “Sealant
Application Diagram” on page 34.
3. Align the side housing (2) with the main
housing (1). Use care not to smear the sealant bead.
4. Install the housing screws (8). Refer to the
screw tightening pattern on page 35.
5. When tightening the fasteners, refer to the
table on page 15 for the required torque
values.
Main Housing (1)
Side Housing (2)
8
Figure 15, Side Housing Removal
T2® 23
RH AXLE SHAFT
Refer to Figure 16
Disassembly
1. Remove all items previously discussed, in
their recommended order.
2. Remove the retaining ring (109) and discard.
3. Remove the lip seal (110) and discard.
4. Remove the outboard bushing (106).
5. Remove the axle shaft (103) in the direction
of arrow.
6. Remove the inner bushing (105).
Inspection
1. Inspect the axle shaft for wear or damage.
Replace if necessary.
100
Assembly
1. Assemble items in reverse order of disassembly.
NOTE: To protect the lip seal from possible
damage when installing into the bore
and over the axle shaft, apply a protective covering over the splines, sharp
corners and/or keyway of the axle shaft
(e.g., cellophane, tape, etc.). Remove
protective covering after installation.
101
103
2
105
106
110
109
Figure 16, Axle Assembly
24 T2
®
BULL GEAR SET
Refer to Figure 17
Disassembly
1. Remove all external items previously discussed in their recommended order.
2. Remove the bull gear set — two miter gears
(102) with two differential pins (108), and
bull gear (107).
Inspection
1. Inspect all items of the bull gear set for wear
or damage.
Assembly
1. Reassemble all parts in the reverse order
of disassembly.
2. Install the bull gear (107).
3. Install the miter gears (102) with the differential pins (108).
1
Figure 17, Bull Gear Set
107
108
102
102
108
T2® 25
REDUCTION GEAR SET
Refer to Figure 18
Disassembly
Reduction Gear Set:
1. Remove all external items previously discussed in their recommended order.
2. Remove the washer (93), jack shaft gear
(91) and reduction gear (90).
3. Remove the jack shaft (92) and second
washer (93).
Inspection
1. Inspect all items of the reduction gear set
for wear or damage.
1
Assembly
1. Reassemble all parts in the reverse order
of disassembly.
2. Install the washer (93) and jack shaft (92).
3. Install the jack shaft gear (91) into the reduction gear (90). Insert onto the jack shaft
(92).
4. Place the washer (93) onto the jack shaft
(92).
93
92
Figure 18, Reduction Gear Set
26 T2
90
91
93
®
INPUT SHAFT
Refer to Figure 19
Disassembly
1. Remove all external items previously discussed in their recommended order.
2. Remove the retaining ring (66) and discard.
3. Remove the lip seal (65) and discard.
4. Remove the washer (64).
5. Remove the pump shaft (61) with pressed
on bearing (62), and the helical spring
(67).
NOTE: Remove the bearing from pump shaft
only if worn or damaged.
6. Remove the wire ring retainer (63) and
discard. Remove the bearing (62) from the
pump shaft (61).
Assembly
1. Reassemble all parts in the reverse order
of disassembly.
2. Install the bearing (62), a new retaining wire
(63), and spring (67) onto the input shaft.
NOTE: Apply a light coating of grease to new
seal (65) before installing. Refer to
“Seal Kit” in the Items List on page
37.
3. Install the input shaft assembly into the main
housing.
4. Install the washer (64), seal (65) and retaining ring (66) into the main housing.
Inspection
1. Inspect the bearing and input shaft for wear
or damage. Inspect the splines on the shaft
for possible damage. Replace if necessary.
66
65
64
63
62
61
67
Figure 19, Input Shaft
T2® 27
SWASHPLATE
Refer to Figures 20-21
Disassembly
1. Requires removal of all items beginning on
page 17.
2. Remove the swashplate (40) and pump
cylinder block assembly (70) as a single
item.
NOTE: Removal will be aided by applying a
small amount of pressure on the trunnion mounted swashplate towards the
center section. While CAREFULLY
removing the swashplate and block as-
sembly, keep the block face ush with
the center section to minimize damage
to the running surface.
3. Separate the pump cylinder block assembly
(70) and the thrust bearing (74) from the
swashplate (40) and set aside.
Assembly
1. Reassemble all parts in the reverse order
of disassembly.
2. Apply a light coating of oil to running surfaces on center section, swashplate bearing
races, thrust bearing assembly and pump
block assembly.
3. Place the thrust bearing assembly (74) into
swashplate (40).
4. With the pistons facing the thrust bearing,
place the pump block assembly (70) into the
swashplate.
5. While pressing the pump block assembly
(thrust bearing – pump cylinder block) and
swashplate together, align to center section
in main housing.
Inspection
1. Inspect the swashplate (40) and thrust
bearing assembly (74) for wear or damage.
Replace if necessary.
2. Inspect pump block per detail on page 31.
40
40
74
70
Figure 21, Hydraulic Pump Components
70
Figure 20, Swash Plate
28 T2
®
BYPASS ARM
Refer to Figure 22
Disassembly
1. Remove all external items previously discussed in their recommended order.
2. Remove the retaining ring (35) and discard.
Remove the bypass arm (34).
3. Remove the retaining ring (33) and discard.
4. Remove the bypass rod (32) and the clip
retaining ring (31) as a single item.
NOTE: It is not necessary to remove the clip
retaining ring (31) from the bypass rod
(32) unless it is damaged or worn.
5. Remove the lip seal (30) and discard.
Inspection
1. Inspect the bypass rod (32) for wear or damage. Replace if necessary.
Assembly
1. Reassemble all parts in the reverse order
of disassembly.
2. Install a new lip seal (30).
3. Install the bypass rod (32) with new clip
retaining ring (31), if removed.
4. Install the new retaining ring (33).
5. Install the bypass arm (34).
6. Install the retaining ring (35).
35
34
33
NOTE: Take care to insure that the bypass rod
is free of burrs that may cut the rubber
lip seal.
2. Inspect the housing bore.
31
32
30
Figure 22, Bypass Arm and Rod
T2® 29
CENTER SECTION, MOTOR SHAFT & MOTOR BLOCK
Refer to Figure 23
Disassembly
1. Requires removal of all items beginning on
page 17.
2. Remove the center section mounting screws
(22).
3. Remove the center section, the motor shaft
(82) and the bypass plate (23).
4. Remove the motor cylinder block assembly
(75).
5. Remove the motor thrust bearing (79).
Inspection
1. Inspect the races of the thrust bearing (79)
for wear or damage.
2. Inspect the motor shaft for wear or damage.
Replace if necessary.
3. Inspect for scratches on the machined surfaces of the center section.
4. Inspect motor cylinder block assembly (75)
per detail on page 30.
Assembly
1. Reassemble all parts in the reverse order
of disassembly.
2. Apply a light coating of oil to all running
surfaces.
3. Place the thrust bearing assembly (79) into
the main housing. Position so the thick race
will contact the motor block pistons.
4. Insert the motor shaft assembly (82) into the
center section (20).
5. Insert the bypass plate (23) into the center
section.
6. Place the motor cylinder block assembly
(75) onto the motor shaft (82).
7. Insert the center section (20), the motor
shaft (82), the bypass plate (23) and the motor cylinder block (75) into the main housing
as one assembly.
8. Install the center section screws (22). Refer
to torque chart on page 15.
5. Inspect the bearing surfaces in the main
housing.
23
79
75
Figure 23, Center Section, Motor Shaft & Motor Block
30 T2
83
20
82
22
22
93
81
80
®
FILTER ASSEMBLY
CYLINDER BLOCKS
Refer to Figure 24
Disassembly
1. Remove the magnet (28) and the lter (27).
The lter can be removed without damaging
the lter base.
2. Remove the deector (29).
3. Inspect the check plugs (24, 25). Remove
if necessary.
4. Inspect the lter base (26). Remove/replace
if necessary.
Inspection
1. Inspect all parts for wear or damage. Replace as necessary.
Assembly
1. Install the lter base, if removed.
Refer to Figure 25
Inspect each component of the cylinder block
assemblies for wear or damage. Inspect the
cylinder blocks’ running surface for scratches.
Replace if necessary.
NOTE: During separation of the cylinder
blocks, take care not to damage the
surfaces of the pistons and block.
Apply a thin coating of oil to all compo-
nents of the cylinder block assemblies
before reassembly.
After reassembling the cylinder block components, set aside until ready for installation of
the center section and swashplate. Refer to
pages 28 and 30.
Pistons
2. Install the check plugs, if removed. Refer to
torque chart on page 15.
3. Install the deector (29).
4. Install a new lter (27) and the magnet
(28).
20
22
26
24
25
29
27
Thrust Washers
Springs
Cylinder Block
Figure 25, Pump/Motor Cylinder Block Assembly
28
Figure 24, Filter Assembly
T2® 31
LH AXLE SHAFT
Refer to Figure 26
Disassembly
1. Remove all items previously discussed, in
their recommended order.
2. Remove the retaining ring (109) and discard.
3. Remove the lip seal (110) and discard.
4. Remove the outboard bushing (106).
5. Remove the axle shaft (104) in the direction
of arrow.
6. Remove the inner bushing (105).
Inspection
1. Inspect the axle shaft for wear or damage.
Replace if necessary.
109
110
106
Assembly
1. Assemble items in reverse order of disassembly.
NOTE: To protect the lip seal from possible
damage when installing into the bore
and over the axle shaft, apply a protective covering over the splines, sharp
corners and/or keyway of the axle shaft
(e.g., cellophane, tape, etc.). Remove
protective covering after installation.
1
105
104
101
100
Figure 26, Axle Assembly
32 T2
®
EXPANSION TANK HOSE AND FITTING
Refer to Figure 27
Disassembly
1. Remove the expansion tank hose (141).
2. Remove the O-ring (142) from the expan-
sion tank tting (140) and discard.
3. Remove the expansion tank tting (140).
Inspection
1. Inspect the tting for damage and replace
if necessary.
141
142
Assembly
1. Install the tting into the main housing. Refer
to torque chart on page 15.
2. Install a new O-ring (142) onto the tting.
3. Place the expansion tank hose (141) onto
the tting (140).
Figure 27, Expansion Tank Hose and Fitting
140
T2® 33
ASSEMBLY AFTER A COMPLETE TEAR DOWN
If the unit has been torn down completely, the
following summary identies the assembly procedures necessary to completely assemble the
unit. Each assembly procedure is located by a
page reference.
The part reference numbers provided in each
assembly procedure are keyed to the individual
procedure illustrations, and are also keyed to
the complete unit exploded view on page 36.
1. Install the expansion tank hose and tting.
See page 33.
2. Install the LH axle assembly. See page
32.
3. Install the lter assembly, cylinder block and
motor shaft. See pages 30-31.
4. Install the bypass arm. See page 29.
5. Install the pump block and swash plate. See
page 28.
10. Apply sealant to the main housing prior to
assembly with the side housing. See page
34.
NOTE: Prior to applying the new sealant, the
old sealant must be removed from all
surfaces.
A small consistent bead (approx.
1/16 – 1/8 inch) of the sealant around
the housing face will be sufcient. Use
sparingly.
The illustration below indicates the cor-
rect sealant path.
11. Install the brake assembly. See page 22.
12. Install the control arm (RTN) assembly. See
pages 19-21.
13. Install the expansion tank. See page 18.
14. Fill transaxle with clean oil.
6. Install the input shaft. See page 27.
7. Install the reduction gear set. See page
26.
8. Install the bull gear set. See page 25.
9. Install the RH axle assembly. See page
24.
15. Install the fan and pulley assembly. See
page 17.
16. Install the transaxle into the vehicle.
17. Perform the purge procedures listed on
page 11.
Sealant Path for Main Housing
Figure 28, Sealant Application Diagram
34 T2
®
SIDE HOUSING – SCREW TIGHTENING SEQUENCE
Starting with the number “1” screw location, tighten sequentially through to “10.”
Torque each screw to 105 – 155 lb-in (11.8 – 17.5 Nm).
NOTE: As a general rule, use the low end of
the torque specication.
14
10 Bolt Housing
11
13
14 Bolt Housing
12
Figure 29, Screw tightening sequence
T2® 35
T2® TRANSAXLE EXPLODED VIEW
36 T2
®
T2® TRANSAXLE PARTS LIST
1 Housing, Main
2 Housing, Side
7 Seal, Lip (included in Center Section Kit 202)
8 HFHCS 1/4-20 x 1.25
10 Sealant, Loctite 5900
11 Oil, 20W50
13 Plug
20 Center Section
22 Bolt, Hex Flange
23 Plate, Bypass
24 Check Plug Assembly w/Washer
25 Check Plug/w Assembly w/Washer, .027, Spring
26 Bottom, Filter
27 Cover, Filter
28 Ring, Magnet
29 Deector
30 Seal, Lip (included in Center Section Kit 202)
31 Ring, Retaining (included in Center Section Kit 202)
32 Rod, Actuator
33 Ring, Retaining (included in Center Section Kit 202)
34 Arm, Bypass
35 Ring, Retaining (included in Center Section Kit 202)
40 Trunnion, Swashplate
41 TWHCS 5/16-18 x 1.00
42 Arm, Control
43 Screw, Set 5/16-24 x 2.50
44 Washer , Belleville
45 Washer, Plastic .32 x .80 x .21
46 Washer .34 x .88 x .06
47 Spacer .32 x .59 x .50
48 Spring, Helical Comp
49 Nut, Hex 5/16-24 nylon insert
61 Input Shaft
62 Bearing, Ball 15 x 35 x 11
63 Ring, Retaining (included in Center Section Kit 202)
64 Washer 1.23 x 1.56 x .04
65 Seal, Lip (included in Center Section Kit 202)
66 Ring, Retaining (included in Center Section Kit 202)
67 Spring, Helical
70 Block, Cylinder 8cc
74 Bearing, Thrust 27 x 47 x 14
75 Block, Cylinder 10cc
79 Bearing, Thrust Ball 30 x 52 x 13
80 Ring, Retaining .50 External Motor Shaft (part of 202)
81 Gear, 13T Pinion
82 Shaft, Motor
83 Washer .60 x 1.00 x .03
90 Gear
91 Gear, Jack Shaft 11T
92 Jack Shaft (Pin)
93 Washer .50 x 1.00 x .03
100 Ring, Retainer (included in Center Section Kit 202)
101 Gear, Bevel 12T Spline ID
102 Gear, Bevel 12T .50 ID
103 Axle .75 dia. RH
104 Axle .75 dia. LH
105 Bushing, Inboard
106 Bushing, Outboard
107 Gear 53T Bull
108 Pin, Differential
109 Ring, Retaining Internal Axle (par t of 202)
110 Seal, Lip .75 x 1.125 x .25 TC (part of 202)
120 Puck, Brake
121 Rotor, Brake
122 Plate, Puck
124 Yoke, Brake
125 Pin, Brake
126 Spacer
127 Screw 1/4-20 x 2.0 w/Patch
128 Screw 1/4-20 x 1.0 w/Patch
129 Spring
130 Arm, Brake
131 Washer
132 Nut, Castle 5/16-24 PL
133 Pin, Cotter 3/32 x .75
134 Spring, Brake arm
140 5/16 SAE, 5/32 Tube
141 Hose
142 O-Ring .103 x .299 ID (part of 202)
143 Tank, Expansion
144 Bolt, Self Tapping 10-32 x 1/2, patch
145 Tube
146 Cap, Barbed Vent
150 Fan
151 Pulley
152 Nut
153 Washer
153 Screw 1/4-20 x 0.75
160 Arm, Control RTN
161 Arm, Control RTN
162 Bolt, Hex Flange Head
163 Bushing
164 Assembly, RTN Bi-Directional
165 Arm, Neutral Assembly
166 Bushing
167 Spring
200 Kit, Filter
201 Center Section w/Filter
202 Center Section Kit
205 Seal Kit
206 Kit, T2
207 Kit, T2
®
ROS
®
ROS
T2® 37
GLOSSARY OF TERMS
Axial Piston: Type of design for hydraulic motors and pumps in which the pistons are arranged
parallel with the spindle (input or output shaft).
Bypass Valve: A valve whose primary function is to open a path for the uid to bypass the motor
or pump. Also referred to occasionally as the freewheel valve or dump valve.
Case Drain Line (Return Line): A line returning uid from the component housing to the reser-
voir.
Cavitation: A concentrated gaseous condition within the uid causing the rapid implosion of a
gaseous bubble.
Center Section: A device which acts as the valve body and manifold of the transmission.
Charge Pump: A device which supplies replenishing uid to the uid power system (closed
loop).
Charge Pressure: The pressure at which replenishing uid is forced into a uid power system.
Charge Relief Valve: A pressure control valve whose primary function is to limit pressure in the
charge circuit.
Check Valve: A valve whose primary function is to restrict ow in one direction.
Closed Loop: A sealed and uninterrupted circulating path for uid ow from the pump to the
motor and back.
Decay Rate: The ratio of pressure decay over time.
End Cap: See “Center Section.”
Entrained Air: A mechanically generated mixture of air bubbles having a tendency to separate
from the liquid phase.
Gerotor: A formed rotor set operating about an eccentric that provides a xed displacement for
pumps or motors.
Hydraulic Motor: A device which converts hydraulic uid power into mechanical force and motion by transfer of ow under pressure.
Hydraulic Pump: A device which converts mechanical force and motion into hydraulic uid power
by producing ow.
Hydrostatic Pump: See “Hydraulic Pump.”
Hydrostatic Transaxle: A multi component assembly including a gear case and a hydrostati-
transmission.
Hydrostatic Transmission: The combination of a hydraulic pump and motor in one housing to
form a device for the control and transfer of power.
Inlet Line: A supply line to the pump.
38 T2
®
Integrated Zero-Turn Transaxle: The combination of a hydrostatic transmission and gear case
in one housing to form a complete transaxle.
Manifold: A conductor which provides multiple connection ports.
Neutral: Typically described as a condition in which uid ow and system pressure is below that
which is required to turn the output shaft of the motor.
Pressure Decay: A falling pressure.
Priming: The lling of the charge circuit and closed loop of the uid power system during start
up, frequently achieved by pressurizing the uid in the inlet line.
Purging: The act of replacing air with uid in a uid power system by forcing uid into all of the
components and allowing the air a path of escape.
Rated Flow: The maximum ow that the power supply system is capable of maintaining at a
specic operating pressure.
Scoring: Scratches in the direction of motion of mechanical parts caused by abrasive contaminants.
Swash Plate: A mechanical device used to control the displacement of the pump pistons in a
uid power system.
System Charge Check Valve: A valve controlling the replenishing ow of uid from a charge
circuit to the closed loop in a uid power system.
System Pressure: The pressure which overcomes the total resistance in a system, including all
efciency losses.
Valve: A device which controls uid ow direction, pressure, or ow rate.
Variable Displacement Pump: A pump in which the displacement per revolution can be var-
ied.
Volumetric Displacement: The volume for one revolution.
T2® 39
NOTES
40 T2
®
NOTES
T2® 41
© 2010 HYDRO-GEAR
Printed in U.S.A.
Rev. P6
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