ARL1 Series Piston Pumps■“ARL1” Series Piston Pumps
Geometric Displacement
Pump TypeGraphic Symbol

cm3/rev

125102050100 150

Maximum
OperatingPressurePageMPa

ARL1-6

ARL1 SeriesPiston Pump

ARL1-8
M
O

ARL1-12

7

A-6

ARL1-16

ARL1 Series Piston Pumps

A-3

Hydraulic Fluids
Hydraulic Fluids

Use petroleum base oils such as anti-wear type hydraulicoils equivalent to ISO VG-32 or 46. The recommended
viscosity range is from 20 to 400 mm2/s and temperature
range is from 0 to 60 °C, both of which have to be satisfied
for the use of the above hydraulic oils.

Control of Contamination

Due caution must be paid to maintaining control overcontamination of the operating oil which can otherwise
lead to breakdowns and shorten the life of the unit.
Please maintain the degree of contamination within NAS
Grade 10.
The suction port must be equipped with at least a 100 μm(150 mesh) reservoir type filter and the return line musthave a line type filter of under 10 μm.

Instructions
Mounting

When installing the pump the filling port should be positioned
upwards.

Alignment of Shaft

Employ a flexible coupling whenever possible, and avoid
any stress from bending or thrust.
Maximum permissible misalignment is less than 0.1 mm
TIR and maximum permissible misangular is less than0.2°.

Drain Piping

Install drain piping according to the chart and ensure thatpressure within the pump housing should be maintained at
a normal pressure of less than 0.1 MPa and surge pressureof less than 0.5 MPa.
Length of piping should be less than 1 m, and the pipe end
should be submerged in oil.
In case ARL1 pump, a screw-in torque of fitting is 55 to75 Nm. Do not apply bending and thrust torque to thefitting.
[Recommended Drain Piping Size]

Suction Pressure

Permissible suction pressure at inlet port of the pump is
between -16.7 and +50 kPa.
For piping to the suction port, use the pipes of the same
diameter as that of the specified pipe flange to be used.
Make sure that the height of the pump suction port iswithin one meter from the oil level in the reservoir.

Hints on Piping

When using steel pipes for the suction or discharge ports,
excessive load from the piping to the pump generatesexcessive noise.
Whenever there is fear of excessive load, please use rubberhoses.

ModelFitting Size

Inside Dia. of Pipe

ARL1

3/8

10 mm

Bleeding Air

It may be necessary to bleed air from pump case andoutlet line to remove causes of vibration. An air bleedvalve (Model Number ST1004-*-10*, Page A-259) isrecommended for this purpose.

Suction Piping

In case the pump is installed above the oil level, thesuction piping and suction line filter should be locatedlower than the pump position to prevent air in the suction
line.

A-4

ARL1 Series Piston Pumps

PISTON PUMPS
Starting

ARL1 Series

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 thepump is returned direct to the reservoir or the actuatormoves in a free load.
[Volume of Pre-fill Oil Required]
Model

Volume cm3

ARL1285

Setting Discharge Pressure and Delivery

At the time of shipment, the unit has been preset tomaximum delivery and minimum discharge pressure.
Adjust the preset delivery and pressure to meet yoursystem requirements.

Adjustment of Discharge Pressure

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

Adjustment VolumeMPa

ARL1

1.5

Displacement Adjustment Function

This pump does not have a displacement adjustment
function.
Install a flow control valve, if necessary.

ARL1 Series Piston Pumps

A-5

ARL1 Series Piston Pumps
Pressure Adj.Screw

Spool

Control Piston
Drain Port
Spring, Yoke ReturnPivot

OUTIN
Shaft
Cylinder BlockPiston

Ass'yYokeSlipper Retainer■ Features● Low noise and high reliability based on the long established experience
The noise at full cut-off with a pressure of 7 MPa, pump rotational speed of 1500 r/min, and measured distance of 1 m is as low
as 55 dB(A) (representative value of ARL1-16). This series also has a high reliability based on Yuken’s long-time experience ofmanufacturing piston pumps.
● Lightweight and compact
Compared to the AR Series Variable Displacement Piston Pumps, this series is reduced by 40 % both in mass and volume,
realizing a greatly lightweight and compact design.

A-6

ARL1 Series Piston Pumps

PISTON PUMPSARL1 Series

ARL1 Series Piston Pumps, Pressure Compensator TypeGraphic Symbol■ Specifications
Minimum Adj.
Pressure
MPa

Geometric
Displacement
cm3/rev

Model Numbers
ARL1-6-＊R01＊-106.2

ARL1-8-＊R01＊-108.5

ARL1-12-＊R01＊-1012.3

ARL1-16-＊R01＊-1016.3

Shaft Speed Ranger/minMax. Operating
Pressure
MPa

1.2

Max.

71800

Approx. Masskg

Min.

6.8
（Flange Mtg.）
9.0（Foot Mtg.）

600■ Model Number Designation

ARL1-6-F

R01S-10Series Number

Geometric
Displacement

Mounting

Direction ofRotation

Control TypePort Position

Design Number

ARL1

6：6.2 cm3/rev
8：8.5 cm3/rev
12：12.3 cm3/rev
16：16.3 cm3/rev

F：Flange Mtg.
L：Foot Mtg.★

(Viewed fromShaft End)
R：Clockwise

01：Pressure
Compensator
Type

S：Side Port
(Standard)
A：Suction Port
Position: Down
Wards

10

★ Foot mounting is available only for side ported type.

ARL1 Series Piston Pumps

A-7

Typical Performance Characteristics of ARL1 at Viscosity 32 mm2/s [ISO VG 32 Oils, 40°C]

Efficiency %Input Power

Output Flow
Input Power

Pressure MPa

Input Power kW

Output Flow

Overall Efficiency

Input Power kW

Overall Efficiency

Volumetric Efficiency

Output Flow L/min

Volumetric Efficiency

Output Flow L/min

Efficiency %● ARL1-6

Pressure MPa

Input Power

Output Flow
Input Power

Pressure MPa

Input Power kW

Output Flow

Overall Efficiency

Input Power kW

Overall Efficiency

Volumetric Efficiency

Output Flow L/min

Efficiency %Volumetric Efficiency

Output Flow L/min

Efficiency %● ARL1-8

Pressure MPa

Pressure MPa

Input Power kW

Input Power

Input Power kW

Input Power

Output Flow

Output Flow L/min

Output Flow

Overall Efficiency

Input Power kW

Overall Efficiency

Volumetric Efficiency

Output Flow L/min

Efficiency %Volumetric Efficiency

Output Flow L/min

Efficiency %● ARL1-12

Pressure MPa

Efficiency %Volumetric Efficiency

Output Flow
Input Power

Input Power kW

Overall Efficiency

Output Flow L/min

Efficiency %● ARL1-16
Volumetric Efficiency
Overall Efficiency

Output Flow

Input Power

Pressure MPa

A-8

Pressure MPa

ARL1 Series Piston Pumps

PISTON PUMPS
Typical Performance Characteristics of ARL1 at Viscosity 32 mm2/s [ISO VG 32 Oils, 40°C]■ Drain
1.0

1800 r/min

0.3

1500 r/min

0.2
0.1042

Full Cut-off0.8Drain L/min

Input Power kW

0.4

ARL1 Series■ Full Cut-off Power

1800 r/min
1500 r/min

0.60.406

Full Cut-off Pressure MPa

1500,1800 r/minw

Full Flo0.2246Pressure MPa■ Noise Level [One meter horizontally away from pump head cover]
N＝1500 r/min

Full Flow60③②555045①

Full Cut-off

024

Pressure MPa

6

N＝1800 r/min

65④（A）
Noise Level dB（A）
Noise Level dB

65④③6055②

Full Cut-off

①5045

8

Full Flow

024

Pressure MPa

6No.

Displacement①q = 6.2 cm3/rev②q = 8.5 cm3/rev③q = 12.3 cm3/rev④q = 16.3 cm3/rev

8

Response Characteristics Change in Accordance with Circuits and Operating Conditions■ Test Circuit and Conditions■ Result of Measurement● CircuitSOLHigh Pressure Rubber Hose
3/4B×1000mm

Pressure

t1

t2
PS

P1
2 MPa

M

SOLM
OOFF

● Conditions
Shaft Speed：1500 r/min
Hydraulic Fluid：ISO VG32 Oil
Oil Temperature：40 ℃（Viscosity 32 mm2/s）

Model
ARL1

Full Cut-off Pressure
P1MPa
7ARL1 Series Piston Pumps

2 MPa

TimeONOFF

Response Timemst1

t2

Overshoot Pressure
PsMPa180

1252.5A-9Side Port Type
ARL1-＊-FR01S

ARL1-＊-LR01S
17Suction Port
Rc3/4 Thd.

5131X

Pressure Gauge Connection
Rc1/4 Thd.(with Plug)
Surface of Discharge Port

Surface of Suction Port

95 Dia.

1056
Discharge Port
Rc1/2 Thd.

★ Install the pump so that the “Filling Port” is at the top.

Suction Port Position：Down Wards
ARL1-＊-FR01A

58

Suction Port
Rc 3/4 Thd.

View Arrow A

63

8162

Drain Port
Rc3/8 Thd.

Pressure Gauge Connection
Rc1/4 Thd.

ADOWN

UPDischarge Port
Rc1/2 Thd.

Filling Port
21 Hex.

● For other dimensions, refer to “Side Port Type”.

A-1080
4.79
4.76

1174

2762

6.5
2553.5130106

44.5

132

A56

Surface of Drain Port

19.05
19.02 Dia.
21.24
21.08

Filling Port ★
21 Hex.

Lock Nut
10 Hex.
Fully Extended
60
8440

3156

Drain Port
Rc3/8 Thd.

INC.

145
180

27.5

84.5

Pressure Adj. Screw
10 Hex.

56.5

95

82.55
82.50 Dia.

50

View Arrow A

1595

132

X

1412 Dia.Through24 Dia.Spotface
4 Places

ARL1 Series Piston Pumps

PISTON PUMPS■ Spare Parts List

17 37

41 42 14 36 34 15 13 12 11 40 40 38740 18 23 19 32 16 35

410936 44
8620

ARL1 Series

ARL1-6/8/12/16-＊R01

14325312846339492948452647227524 22 33 21 30● List of Seals and Bearings
Item

Name of Parts

Part Numbers

Qty.

5Gasket1202-PK314357-5

125Oil Seal

TK280035-7

126Bearing

1202-PK413170-2

127Bearing

1202-PK413171-0

134O-Ring

OR NBR-70-1 P5-N

135O-Ring

OR NBR-90 P14-N

136O-Ring

AS 568-018 (NBR-70-1)

237O-Ring

AS 568-020 (NBR-90)

1ARL1 Series Piston Pumps

A-11