Service Manual

HY13-1521-M2/US Service Manual
General Information Series HB Hydrostatic Transmission
Install ¼ SAE hex plug
into port on side of end
block
Install the ¼ SAE hex plug.
Hand start several threads to
prevent cross threading.
Torque to
specifications
Torque ¼ SAE hex plug on
side of end block 252 – 288 in
lbs.
Install charge relief
cartridge
Install the charge relief
cartridge hand start several
threads to prevent cross
threading. Using a ¼ “ allen
head socket torque to 252 –
288 in lbs.
*If a hex type valve is present,
use an 11/16“hex socket to
apply torque.
Install O-ring
Lube case drain O-ring and
install in end block.
Note: Certain models may or
may not have this o ring.
If your end block has this O-
ring replace if end block does
not have this o ring then it will
not be required.
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Parker Hannifin Corporation
Hydraulic Pump/Motor Division
Greeneville, Tennessee USA