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Bulletin HY22-3220A/US
Instruction Manual
550 Series Hydraulic Power Units
Introduction and Description
Introduction
This manual provides descriptive operation and maintenance
instructions for 550 Series Power Units manufactured by the
Parker Hannifin Corporation, Oildyne Division. Any additional
information may be obtained from Parker by referencing the
unit part number stamped on the product label or by contacting
your local authorized Parker Distributor.
Some of the Information in this manual may not apply to all
power units. Information about custom units may require service
and application information from other sources.
Warning
This Instruction Manual should be read in its entirety and
understood prior to installing and operating the Oildyne
550 Series Hydraulic Power Units.
It is imperative that personnel involved in the installation,
service, and operation of the Oildyne units be familiar with
how the equipment is to be used. They should be aware of
the limitations of the system and its component parts, and
have knowledge of good hydraulic practices in terms of safety,
installation, and maintenance.
Explanation of Warning Labels
The following labels will be used in this Instruction Manual and
on all applicable Oildyne products.
Description
The 550 Series Hydraulic Power Unit consists of an AC electric
motor, fixed displacement gear pump, relief valve and reservoir
with options for different circuit types incorporating NG6/D03
valves or 2 position/2 way cartridge valves. The gear pump is
driven through a coupling located between the electric motor
drive shaft and the pump drive shaft.
For dimensional drawings please see pages 4 to 6.
Two basic versions are available, either with SAE-6 (9/16-18)
ports for the P and T connections, or with JIC-6 male extension
tube fittings for use with the NG6/D03 version of the adapter.
For hydraulic schematics, please see pages 7 and 8.
The life expectancy of Parker Oildyne power units is directly tied
to the frequency of use, the product in which it is incorporated
and the application.
Shipping weights for the 550 Series Power Units range from
14.5 kg (36 lbs) to 50 kg (110 lbs).
The 550 Series Power Units are intended to be used in a variety
of applications, specified by the customer, where pressurized
hydraulic fluid is needed to move an actuator(s), charge an
accumulator(s) or supply test equipment.
Pressure Capability (depends on pump/motor combination):
• Up to 207 bar (3000 psi) maximum
Flow Output (depends on pump/motor combination):
• At 1725 rpm: .95 – 5.6 lpm (.25 – 1.5 gpm)
• At 3450 rpm: 1.9 – 11.4 lpm (.5 – 3 gpm)
Motor Specifications:
• .37 – 2.2 kW (.5 – 3 HP)
• 56C with base
• TEFC
Voltages (standard motors are 60 Hz):
• Single phase: 115/208-230 VAC
• Three phase: 208-230/460 VAC
50 Hz motors are available upon request.
Acceptable Fluids:
• Standard Automatic Transmission Fluid (ATF)
• Most mineral based hydraulic fluids
Viscosity range: 32-64 cSt (150-300 SSU) at 38°C (100°F)
Please contact Parker Oildyne to discuss any alternate fluids.
Parker Oildyne takes no responsibility if unapproved
alternative fluids are used.
Temperature Ranges:
Operating:
-7 to 60°C (+20 to 140°F)
Storage:
-10 to 60°C (+14 to 140°F)
550 Series Power Units should be installed indoors in a clean
environment.
550 Series Power Units are designed for a continuous duty.
However, do not operate the power unit with pump flow going
over the relief valve for any length of time; this creates excessive
heat. It is recommended that for any applications requiring a
maintained pressure, a circuit be selected which incorporates a
load holding check valve(s). Examples of these circuits would be
the D1, using the Manapak double pilot operated check valves,
or a two position/two way cartridge valve with included check
valve.
There may be hydraulic liquid under
pressure. Do not open unit or break pipe
connections until hydraulic pressure has
been released.
Be careful; take precautions; examine
instructions before operation.
Parker Hannifin
HPS Division
New Hope, MN 55428 USA
