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Parker Hannifi n Corporation
Hydraulic Pump/Motor Division
Greeneville, Tennessee USA
Service Manual
HP2 Series Hydrostatic Tandem Pumps
HY13-1521-M1/US
Notes
Final Checks
• Using an adjustable wrench, place on the fl ats of shaft (30) and make sure the shaft turns freely
prior to installing on equipment.
• Pressurize the case drain port for 25 PSI dry air or nitrogen and submerge in solvent to check for exter-
nal leaks. Make sure to plug the remaining ports prior to submerging.
• Check HP2 Tandem pump for rotation. Torque required to rotate coupling shaft should not be more
than 50 lb/ft.
• Use test stand if available, to check operation of the HP2 Tandem pump.
Hydraulic Fluids
Keep the hydraulic system fi lled with one of the following:
• 10W40 SE or SF, or manufacturer’s suggested oil.
• Hydraulic fl uid as recommended by equipment manufacturer, but the viscosity should not drop below
50 SUS or contain less than .125% zinc anti-wear additives.
CAUTION
Do not mix oil types. Any mixture, or an unapproved oil could deteriorate the seals. Maintain
the proper fl uid level in the reservoir. When changing fl uid, completely drain old oil from the
system. It is suggested also that you fl ush the system with clean oil.
Filtration
Recommended fi ltration 20 micron, internal fi lter.
Oil Temperature
Maximum operating temperature 230
o
F (110
o
C).
# 130505
•
Hydraulic Fluid as recommended by equipment manufacturer. Use CoolTemp Hydro-Max
TM
Extended-Life
Hydrostatic Fluid. See owners manual for capacity. #345044 - quart; # 345046 - 2 gallons
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