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11 Transmission Teardown
Hydro-Gear 0500 / 0650
Figure 1 Hydro-Gear Model 0500 Hydrostatic Transaxle
General Information
IMPORTANT: Cleanliness is a primary means of
assuring satisfactory life on new or repaired units.
Cleaning parts by using a solvent wash and air dry-
ing is usually adequate. As with any precision equip-
ment, all parts must be kept free of foreign materials
and chemicals.
• Protect all exposed sealing surfaces and open cavities
from damage and foreign material.
• Prior to removing and disassembling the transaxle, the
tractor should be steam cleaned or blown with com-
pressed air before beginning any repairs.
• It is recommended that all seals be replaced before
transaxle is reassembled. Lightly lubricate all seals
prior to assembly.
• After the transaxle is removed from the tractor, remove
all external components such as the brake arm, brake
actuating pins, control arm, cooling fan, input pulley,
and frame mounting hardware before separating the
case halves.
Identification
Tags Here
HYDRO-GEAR 0500 / 0650
Specifications
Type Hydrostatic, Hydro-Gear 318-0500, 322-0500,
or 322-0650
Pump Variable displacement axial piston
Motor Fixed displacement axial piston
Control Single Pedal Foot Control
with Release Valve for Manually Pushing.
Hydraulic Fluid 20W-50 Premium Engine Oil
Fluid Capacity 80 oz.
Ground speeds Forward: 0-4.7 mph (7.5 km/h)
@ 3400 rpm: Reverse: 0-2.6 mph (4.1 km/h)
Differential: Bevel Gear Type
Axle Shaft: .75 in.
Continuous Torque 0500 Models: 135 ft. lbs.,
Output 0650 Models: 160 ft. lbs.
Drawbar Rating 0500 Models: 193 lbs., 0650 Models: 213 lbs.
Maximum Weight 0500 Models: 500 lbs., 0650 Models: 540 lbs.
on Axle
WARNING
Before beginning any service work, turn the PTO
off,set the parking brake, turn the ignition switch
off, remove the key, disconnect the spark plug
wire, and disconnect the negative battery cable.
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