Parker Hannifin Corporation
Gear Pump Division
Kings Mountain, North Carolina USA
15
Catalog HY09-SM500/US
Hydraulic Oil Recommendation
PGP/PGM500 Series
Service Manual
Water Base Fire Resistant Fluids
Two types of water base fluids (WBF) may be used with our
gear pumps and motors.
Both types of WBF come in various viscosity grades. Select
the grade best suited to the equipment and its operation in
terms of pressure, speed, temperature, duty cycle, etc.
The fluid used should be recommended by the O.E.M.
or a reputable fluid supplier
Operations outside the range of 400 to 2000 rpm and over
3000 psi (2000/2500 psi in the wider gear widths) should be
reviewed with your Parker sales representative
Water-in Oil (60/40) invert Emulsions
Invert emulsions are approved for use with our bushing style
pumps at pressures up to 3000 psi or 500 psi below catalog
rated pressures, whichever is lower
Water Glycol Solutions
Water glycol solutions of the types normally used in
hydrostatic systems are recommended for use with our
bushing style pumps. These consist of about 60% glycol
and about 40% water with additives to improve lubricity and
other characteristics. Pressures up to 3000 psi are approved,
depending on the gear width.
WBF Filtration
Filtration that seems to give the best results consists of a
100-mesh inlet screen and a return line filter. For water base
fluids, the inlet screen should be sized up three to four times
the pump capacity. The return line filter should be of a rating
and size recommended by the fluid and filter manufacturers
to achieve a recom¬mended ISO contamination level
Note: Finer filtration may be required by other components
in the system
High Water Base Fluids (HWBF)
The use of 95/5 emulsion is not recommended
Comments On The Use Of Other Oils And Fluids
Biodegradable Oil (Vegetable-Based)
Oils of this type with properties similar to recommended pe-
troleum oils may be used. Performance, pressure ratings and
durability are not adversely affected in bushing style pumps.
Automatic Transmission Fluid (ATF)
In general these oils have low viscosity and may be used only
at reduced operating pressures and oil temperatures
Diesel Fuel, Kerosene, Coal Oil
Although sometimes used as a dilutant for cold weather
operations, their use is not recommended because they are
insufficiently refined products
Transformer Oil
Sometimes used for extremely cold weather operation. It is
not generally recommended as it becomes too thin at normal
operating temperatures. Oil to U.S. Military Spec MIL-H-5606
is in this category.
OPERATING LIMITS
GENERALLY RECOMMENDED
WITH VARIOUS FLUIDS
Max.Operating
Max. Inlet
Max. Inlet
Fluid:
Temp.
Line Velocity
Vacuum
Petroleum Oil
180°F(82°C)
8 fps(2.5m/s)
5” (13cm) Hg
WIO Emulsion 150°F(65°C)
4 fps (1.2m/s)
0” (0cm) Hg
Water Glycol
150°F(65°C)
4 fps (1.2m/s)
0” (0cm) Hg
Note: These figures represent generally accepted maximums
and will not prove satisfactory in all installations. For very severe
duty cycles, it will likely be advantageous to design and operate
the system at something less than these maximum limits
• DO NOT USE ANY TYPE OF FLUID NOT
RECOMMENDED IN THIS BULLETIN WITHOUT FIRST
CONSULTING OUR PRODUCT SUPPORT DEPT
• OBTAIN YOUR FINAL FLUID RECOMMENDATION
FROM YOUR FLUID SUPPLIER
