Parker PGP 600 Series - Page 24

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Catalog HY13-PMD600-SM/US
PGP/PGM 600 Series
Gear Pumps & Motors Service Manual
Fluid Recommendations
Two types of water base uids (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 uid used should be
recommended by the O.E.M. or a reputable uid 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.
With roller bearing pumps, life may be reduced to 20%
to 50% of that experienced with petroleum oil. Reducing
the pressure and/or gear width can extend pump life
appreciably.
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. Water glycol
solutions are not approved for use with our roller bearing
pumps.
WBF Filtration
Filtration that seems to give the best results consists of a
100-mesh inlet screen and a return line lter. For water base
uids, the inlet screen should be sized up three to four times
the pump capacity. The return line lter should be of a rating
and size recommended by the uid and lter manufacturers
to achieve a recommended ISO contamination level.
NOTE: Finer ltration may be required by other components
in the system.
High Water Base Fluids (HWBF)
The use of 95/5 emulsion is not recommended.
Phosphate Ester
Phosphate ester does not appear to affect pump
performance and service life, but Viton (FKM) seals
should be used with this uid. Viscosity characteristics of
phosphate ester uid limit the recommended ranges of
operating and ambient temperatures. Questions on the use
of uids with our equipment should be discussed with a
sales representative or Product Support Dept
Biodegradable Oil (Vegetable-Based)
Oils of this type with properties similar to recommended
petroleum oils may be used with our bushing style pumps
only. These are not approved for use in our roller bearing
pumps. 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
insufciently rened 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
Fluid
Max.
Operating
Temp.
Max. Inlet
Line Velocity
Max. Inlet
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 gures 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
Hydraulic Oil Recommendations (Continued)
Water Base Fire Resistant Fluids Comments: Use of other oils and fluids