HY28-2600-550-M1/USA
HY28-2600-550-M1/USA
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
Standard Hydraulic Power Units Installation and Maintenance Manual
D, H, V-Pak and Custom Power Units
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Parker Hannifin Corporation
Hydraulic Pump and Power Systems Division
United States
Parker Hannifin Corporation
Hydraulic Pump and Power Systems Division
United States
Maintenance
Notes
Maintenance Suggestions
1. Set up a filter maintenance schedule and follow
it diligently.
2. Inspect filter elements that have been removed
from the system for signs of failure which may
indicate that the service interval should be
shortened, the oils viscosity is too high or too
cold, or that the filter is undersized.
3. Never return to the system any fluid that has
leaked out.
4. Always keep the supply of fresh fluid
covered tightly.
5. Use clean containers, hoses and funnels when
filling the reservoir. Use of a filter cart when adding
oil is highly recommended.
6. Use common sense precautions to prevent entry
of dirt into components that have been temporarily
removed from the circuit.
7. Make sure that all clean-out holes, filter caps
and breather cap filters on the reservoir are
properly fastened.
8. Do not run the system unless all normally provided
filtration devices are in place.
9. Make certain that the fluid used in the system is of
a type recommended by the manufacturers of the
system or components.
10. Before changing from one type of fluid to
another (e.g., from petroleum base oil to a fire
resistant fluid), consult component and filter
manufacturers in the selection of the fluid and
filters that should be used. Also consult the
publication “Recommended Practice for the Use
of Fire Resistant Fluids for Fluid Power Systems”
published by the National Fluid Power Association.
11. Parker offers an oil sampling kit, which can be
used to ascertain the condition of the system fluid.
Maintaining Proper Oil Temperature
Hot oil in your equipment’s hydraulic system is one
of the primary causes of poor operation, component
failure and downtime. Here are some pointers on
maintaining proper oil temperature. The oil in your
hydraulic system was designed for operation within
a specified temperature range. You may be able to
run it at hotter temperatures for short periods of time,
intermittently, without adverse effects. If you run
continuously with oil that’s too hot, your equipment
will operate poorly causing key component failure
and machine downtime.
“Hot oil” is a relative term. In most cases, 120° F
(49º C) at the reservoir is considered an ideal operating
temperature. Always take an oil temperature reading
at the reservoir, not at a component or any of the
piping. Some hydraulic systems are designed to
operate at 130° F (54º C) or higher. If you don’t
know the maximum operating temperature for your
equipment, check your component manual for
temperature and viscosity limitations.
How Can You Keep Your Equipment’s Hydraulic
System From Running Too Hot?
1. Set up a regular schedule for checking the
oil temperature, appearance, smell and feel.
Change oil as recommended by the equipment
manufacturer.
2. If relief or flow-control valves are running hot,
check and adjust their settings. Follow your
equipment owner’s manual.
3. Consider adding an unloading circuit to reduce
system pressure between machine cycles.
4. Consider using a VFD for motor control. Most
machine cycles require maximum motor speed
for only a brief part of the cycle. Heat, noise
and power reductions can be substantial when
using a VFD. Contact Parker or your local Parker
distributor for information regarding our Drive
Controlled Pump (DCP).
