TYM T233 HST, Service Manual

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1. Hydrostatic Transmission Disassembly
Fig.:Complete assembly
IMPORTANT: The HST housing is aluminum
material and can be easily damaged by steel
tools. Be careful not to damage machined
surfaces. Do not use screw driver or other
sharp objects.
Cap Screws
Fig.: Body Disassembly
Snap ring
1.Remove two hexagon socket head cap screws of
the housing side .
2.Remove snap ring and seal cover of the body side.
3.Remove four hexagon socket head cap screws
of the body side .
4. Remove the body from the housing.
NOTE: Use support for housing, or
rotating assembly in housing may protrude.
5. Remove gasket from body.
6. Remove T-valve for charge relief valve.
7. Remove two dowel pins and two spring
pins.
NOTE : Unless dowel pins and spring pins
are damaged or loosen, do not need to
remove. If replacement is necessary, be
careful not to scratch the machined surfaces
of body.
8.Remove two relief valves from body. Clean
the valves in a suitable solvent and check for
damaged parts. Two relief valves are
interchangeable, but it is recommended that
the valves go into original holes during
assembly.
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