Service Manual

HY13-1521-M2/US Service Manual
General Information Series HB Hydrostatic Transmission
Disassemble the pump
section
Note: Two left bolts
measure 1 ¾” long the
other four are 2 ¾” long.
Using a 9/16” socket remove
the (6) 3/8-16UNC bolts
securing the top housing to
the endblock. Note two (2) of
the bolts are shorter than the
other four (4) that secures
the charge pump cover to
endblock and top housing.
Disassemble the pump
section
Note: Before completely
removing the top housing,
lay pump section on its side
so that pistons do not fall out
of the bores.
Disassemble the pump
section
Remove the top housing
from the endblock assembly.
Note that the swash block
and trunnion arm will remain
in the top housing when it is
removed from the end block
assembly.
Remove the swash block
assembly
Remove the swash block
assembly from the top
housing by lifting it out.
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Parker Hannifin Corporation
Hydraulic Pump/Motor Division
Greeneville, Tennessee USA