Service Manual

HY13-1521-M2/US Service Manual
General Information Series HB Hydrostatic Transmission
Remove unit from vehicle
Clean unit of grass and other
debris; let dry.
Drain the oil from the unit
Remove the breather/dipstick
assembly.
Place an oil pan under the
unit for oil collection.
Remove the filter and
position the unit as
necessary to drain oil into the
pan.
Remove the fan and fan
spacer
Inspect drive fingers for
wear
Note: Some units may not
have a fan. If fan is not
present, skip to next step.
Remove the ¼-20UNC bolt
securing the fan to the shaft
using a 3/8” socket. Remove
the fan washer and fan.
Using a small pry bar or flat
head screwdriver, gently pry
the fan spacer from the taper
on the pump shaft.
Remove the pulley
Inspect the pulley for
damage or abnormal wear
While holding the pulley from
turning, remove the 5/8-
18UNF nut. Remove the flat
pulley washer. Use puller
with ¼-20 bolts of
appropriate length threaded
into the face of pulley to
remove from shaft.
Remove the motor bolts
Using a ¾” socket remove
the (4) ½-20 bolts securing
the motor and parking brake
cable anchor. The lower two
bolts are 2 ¼ “long and the
two top bolts are 6 ½” long.
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Parker Hannifin Corporation
Hydraulic Pump/Motor Division
Greeneville, Tennessee USA