Series Variable Displacement Piston Pumps ...............................

PISTON PUMPS
A
Yuken offers low noise/high efficiency, swash plate type variable displacement piston pumps. These pumps
have been developed by Yuken's leading hydraulic engineers and provide a diverse lineup to meet a wide range
of application requirements.
Series Variable Displacement Piston Pumps ................................ P15

Compact and Lightweight
A compact design and an aluminum body ensures a high power to mass ratio.
Low Noise
Series Variable Displacement Piston Pumps ...................................... P27

A variety of control methods are supported
Ten types of unique control methods are available which integrate amplifiers and sensors. These control
types range from standard pressure compensator control to proportional solenoid pressure/flow control.
Available in a wide range of displacements from 10 to 219 cm3/rev (.610 to 13.36 cu. in.
/rev)
Series Variable Displacement Piston Pumps .......................... P117

Variable displacement piston pumps offer high pressure, high performance in a simple and compact package.
High Pressure: 35 MPa (5080 PSI)
High volumetric efficiency
These pumps maintain a high volumetric efficiency, even at a pressure of 35 MPa (5080 PSI).
Available in a wide range of displacements
Seven models are available in displacements ranging of 16.3 to 180.7 cm3/rev (.995 to 11.03 cu. in./rev).
13
"AR" Series Variable Displacement Piston Pumps
"A" Series Variable Displacement Piston Pumps
"A3H" Series Variable Displacement Piston Pumps

14
" " Series Variable Displacement Piston Pumps
AR16
Axial Port Type
AR16
Side Port Type
"AR" series variable displacement pump has been developed which the aim of even further the quientness in
operation, smaller in size and lighter in mass and based on Yuken technology and engineering which put on market
the "A" series pump which has a reputation for its quiet operation and high efficiency.
Geometric Displacement Maximum

cu. in./rev
Graphic .1 .2 .5 1 2 5 10 15 Operating
Pump Type Page
Symbol Pressure
1 2 5 10 20 50 100 200 300 MPa (PSI)
cm3/rev
AR16
"AR" Series
Variable Diplacement 16 (2320) 18
M
Piston Pumps
O
AR22
15
Hydraulic Fluids
Hydraulic Fluids Control of Contamination
Use petroleum base oils such as anti-wear type hydraulic Due caution must be paid to maintaining control over
oils or R & O (Rust and Oxidation inhibitor) type hydraulic contamination of the operating oil which can otherwise
oils equivalent to ISO VG-32 or 46. The recommended lead to breakdowns and shorten the life of the unit.
viscosity range is from 20 to 400 mm2/s (98 to 1800 SSU) Please maintain the degree of contamination within NAS
and temperature range is from 0 to 60 °C (32 to 140 °F), Grade 10.
both of which have to be satisfied for the use of the above The suction port must be equipped with at least a 100 μm
hydraulic oils. (150 mesh) reservoir type filter and the return line must
have a line type filter of under 10 μm.
Instructions
Mounting Drain Piping
When installing the pump the filling port should be positioned Install drain piping according to the chart and ensure that
upwards. pressure within the pump housing should be maintained at
a normal pressure of less than 0.1 MPa (14.5 PSI) and
Alignment of Shaft surge pressure of less than 0.5 MPa (72.5 PSI).
Employ a flexible coupling whenever possible, and avoid Length of piping should be less than 1 m (3.3 ft.), and the
any stress from bending or thrust. pipe end should be submerged in oil.
Maximum permissible misalignment is less than 0.1 mm In case AR16 and AR22 pump, a screw-in torque of fitting
(.004 inches) TIR and maximum permissible misangular is 40 to 50 Nm (354 to 443 IN.1bs.). Do not apply bending
is less than 0.2°. and thrust torque to the fitting.
Suction Pressure [Recommended Drain Piping Size]

Permissible suction pressure at inlet port of the pump is Fitting Size
between -16.7 and +50 kPa (5 in.Hg Vacuum and 7 PSIG). Inside Dia.
Model Japnese Std. "JIS" & N.American of Pipe
For piping to the suction port, use the pipes of the same European Design Std. Design Std.
diametre as that of the specified pipe flange to be used. 3/8 SAE #8 10 mm
Make sure that the height of the pump suction port is AR16, AR22
[Inside Dia. 8.5 mm (.33 in.) or more] (.39 in.)
within one metre (3.3 ft) from the oil level in the reservoir.
Hints on Piping Bleeding Air

When using steel pipes for the suction or discharge ports, It may be necessary to bleed air from pump case and
excessive load from the piping to the pump generates outlet line to remove causes of vibration. An air bleed
excessive noise. valve (Model Number ST1004-*-10*, Page 820) is
Whenever there is fear of excessive load, please use rubber recommended for this purpose.
hoses.
Suction Piping
In case the pump is installed above the oil level, the
suction piping and suction line filter should be located
lower than the pump position to prevent air in the suction
line.
16 "AR" Series Variable Displacement Piston Pumps

PISTON PUMPS
A
Starting
Before first starting, fill pump case with clean operating
oil via the filling port.
In order to avoid air blockage when first starting, adjust
the control valves so that the discharged oil from the
"AR" Series
pump is returned direct to the reservoir or the actuator
moves in a free load.
[Volume of Pre-fill Oil Required]
Model Volume cm3 (in.3 )
AR16
430 (26.2)
AR22
Setting Discharge Pressure and Delivery

At the time of shipment, the unit has been preset to
maximum delivery and minimum discharge pressure.
Adjust the preset delivery and pressure to meet your
system requirements.
Adjustment of Discharge Pressure

Turning the adjustment screw clockwise, increases
pressure.
Volume adjusted by each full turn of the pressure

adjustment screw
Adjustment Volume
Model Numbers
MPa (PSI)
AR16/AR22-FR01B 2.9 (420)
AR16/AR22-FR01C 5.4 (780)
Adjustment of Delivery
Turning the delivery adjustment screw clockwise,
decreases delivery.
The minimum adjustable flow and adjustable volume of
each full turn of the delivery adjustment screw
Adjustable volume
Model with each full turn Minimum adjustable flow
of the adjustment
Numbers screw cm3/rev (cu.in./rev)
cm3/rev (cu.in./rev)
AR16 1.5 (.092) 6 (.366)
AR22 2.1 (.128) 8.5 (.519)
"AR" Series Variable Displacement Piston Pumps 17

Series Variable Displacement Piston Pumps ...............................

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PISTON PUMPS

Series Variable Displacement Piston Pumps ................................ P15

Series Variable Displacement Piston Pumps ...................................... P27

Series Variable Displacement Piston Pumps .......................... P117

"A" Series Variable Displacement Piston Pumps

"A3H" Series Variable Displacement Piston Pumps

Geometric Displacement Maximum

Suction Pressure [Recommended Drain Piping Size]

Hints on Piping Bleeding Air

16 "AR" Series Variable Displacement Piston Pumps

Setting Discharge Pressure and Delivery

Adjustment of Discharge Pressure

Volume adjusted by each full turn of the pressure

"AR" Series Variable Displacement Piston Pumps 17

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