AR Series

Variable Displacement Piston Pumps■“AR” Series Variable Displacement Piston Pumps
Geometric Displacement
Pump TypeGraphic Symbol

Piston Pumps

A-12

125102050100 150

Maximum
OperatingPressure

PageMPaAR16

AR Series

Variable Displacement

cm3/rev

16M
O

AR22

AR Series Variable Displacement Piston Pumps

A-15

PISTON PUMPS

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.

AR Series

Hydraulic Fluids

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 than
0.2°.

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 AR16 and AR22 pump, a screw-in torque of fitting
is 40 to 50 Nm. Do not apply bending and thrust torque tothe fitting.
[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 generates
excessive noise.
Whenever there is fear of excessive load, please use rubberhoses.

ModelFitting Size

Inside Dia. of Pipe

AR16, AR22

3/8
(Inside Dia. 8.5 mm or more)

10 mm

Bleeding Air

It may be necessary to bleed air from pump case andoutlet line to remove causes of vibration. An air bleed
valve (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 suctionline.

AR Series Variable Displacement Piston Pumps

A-13

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

Volume cm3

AR16AR22430

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
Adjustment Volume
MPa

Model Numbers
AR16/AR22-FR01B

2.9

AR16/AR22-FR01C

5.4

Adjustment of Delivery

Turning the delivery adjustment screw clockwise,
decreases delivery.
The minimum adjustable flow and adjustable volume ofeach full turn of the delivery adjustment screw

A-14

ModelNumbers

Adjustable volume
with each full turnof the adjustment
screw
cm3/rev

AR161.56AR222.18.5

Minimum Adjustable Flow
cm3/rev

AR Series Variable Displacement Piston Pumps

PISTON PUMPS

Pressure Compensator ValveAR Series

AR Series Variable Displacement Piston Pumps
Spool

Pressure Adj. Screw

Control Piston
Drain Port
Pivot

Flow Adj. Screw

Journal Bearing
OUT
IN

Shaft
Port Plate

Yoke

Cylinder Block

Slipper Retainer

SpringPiston Ass'y■ Features● Smaller in Size and Lighter in Mass
As indicated in the dimensional comparison presentedbelow, the AR16 is smaller than the A16 (32 design). Also,
the mass of AR16 is substantially lighter than the A16.

● Low NoiseThe noise level of AR16 has been reduced at full flow andfull cut-off compared with that of the excellent A16 quietpump.

[Comparison of “AR16” with “A16”]“AR16” Type Noise Level Characteristics (Example)

188

70

Full Flow

60
50
40

Fully Extended 240

N＝1500 r/min

80

195

Fully Extended 263.5

AR16, 22 Design（A）
Noise Level dB

A16, 32 Design

Full Cut-off048

Pressure MPa

1216130● High Reliability
Since it uses the internal parts of "A" series piston pumps
that it is belongs to abundant experience in sales
performance with high reliability.

AR Series Variable Displacement Piston Pumps

A-15

AR Series Variable Displacement Piston Pumps, Pressure Compensator TypeGraphic Symbol

MO■ Specifications
GeometricDisplacement
cm3/rev

Min. Adj.
Flow
cm3/rev

AR16-FR01＊＊-22

15.8

6.0

AR22-FR01＊＊-22

22.2

8.5

Model Numbers

Operating Pressure
MPa

Shaft Speed Range
r/min

Rated

Max.

Min.

1800

600

Intermittent★
16Approx. Masskg
11.8
12.5

★ When setting the pressure, make sure the full cut-off pressure never exceeds the maximum intermittent pressure.

■ Model Number Designation

AR16-F

R01

BS-22

Series NumberMounting

Direction of Rotation

Control Type

Pres. Adj. Range

Port Position

Design Number

B : 1.2〜7
C : 2.0〜16

None : Axial PortS : Side Port

AR16(15.8 cm3/rev)
AR22(22.2 cm3/rev)

A-16

Pressure[Viewed from Shaft End] 01 :Compensator
F : Flange Mtg.
R : Clockwise (Normal)
Type

AR Series Variable Displacement Piston Pumps

2222

PISTON PUMPS■ Pipe Flange Kits
Pipe flange kits are available. When ordering, specify the kit number from table blow.
Name of Port

AR16-FR01
AR22-FR01

Pipe Flange Kit Numbers
Threaded Connection

Socket Welding

SuctionF5-06-A-1021

F5-06-B-1021

Discharge—★

—★

AR Series

Pump Model Numbers★ Discharge port is available only for the threaded connections.

A -1021
Pipe Flange Kit for Suction Port：F5-06- B
F5-06-A-1021
11 Dia. Through2 Places

48

F5-06-B-1021
15

Rc3/4 Thd.

830

22.2

O-RingSO-NB-G30

27.7 Dia.

47.6

66

O-RingSO-NB-G30

15

15Soc. Hd. Cap Screw (2 Pcs.)
M10×30 Lg.

Soc. Hd. Cap Screw (2 Pcs.)
M10×45 Lg.

Approx. Mass…0.5 kgApprox. Mass…0.3 kg■ Mounting Bracket Kits
Mounting bracket available on separate order.
Pump Model Numbers

Mtg. Bracket Kit Numbers

Approx. Masskg

AR16-FR01
AR22-FR01

LP-1A-10

2.2Note : The mounting bracket kit consists of a mounting bracket, two hex. bolts and two plain washers.

Mtg. Bracket Kit : LP-1A-10

Plain Washer(2 Pcs.)50 (56.5)
95

145.5

80

3Hex. Bolt (2 Pcs.)
M10×25 Lg.

15

12 Dia. Through24 Dia. Spotface 4 Places

1714Mtg. Bracket

95(27.5)

72.5

72.5
180

AR Series Variable Displacement Piston Pumps

A-17

Typical Pump Characteristics of Type AR16 at Viscosity 20 mm2/s [ISO VG32 Oils, 50°C]

30

Output Flow20ert Pow

Inpu
04108Pressure MPa

1216012Overall Efficiency

8060

30

Output Flow

Input Power kW

60

Volumetric Efficiency

10820erowut P

6

Inp4

1020048Pressure MPa

1216012

Input Power kW

Overall Efficiency

80

N＝1800 r/min

100

Output Flow L/min

Volumetric Efficiency

Efficiency %N＝1500 r/min

100

Output Flow L/min

Efficiency %■ Performance Characteristic Curve1086420■ Input Power
N＝1500 r/min

10N＝1800 r/min

10P＝MPa

8P＝14P＝126

P＝10P＝ 84P＝ 6P＝ 42Input Power kWInput Power kW

P＝MPa

P＝14P＝12P＝1086

P＝ 8
P＝ 64

P＝ 4
P＝ 2

2P＝ 2

P＝0.7

P＝0.70510152025Output Flow L/min

3005101520Output Flow L/min

2530Note) The dotted line in the graph indicates less than minimum adjustable flow.

■ Full Cut-off Power■ Drain
1.5
N＝1800 r/min

1.0Drain L/min

Full Cut-off Power kW

Full Cut-offn/mi0r180min0 r/0.5

150

1.0
N＝1500 r/min

0.5

in0r/m0, 1800
Full Flow 1504812

Full Cut-off Pressure MPa

1604812Pressure MPa

16■ Noise Level [One meter horizontally away from pump head cover]
N=1500 r/min

70

50
40

A-18

Full Flow60

Full Cut-off048

Pressure MPa

1216

N=1800 r/min

80

Noise Level dB(A)Noise Level dB(A)8070Full Flow

60
50
40

Full Cut-off048

Pressure MPa

AR Series Variable Displacement Piston Pumps

1216

PISTON PUMPS

4060

Output Flow

3020erowut PInp04108Pressure MPa

12160121086420

N＝1800 r/min

Volumetric Efficiency

80

Overall Efficiency
40

Output Flow

6030er

I0420owtPnpu

108Pressure MPa

12160121086420Input Power kW

Overall Efficiency

100

Output Flow L/min

80

Efficiency %N＝1500 r/min

Volumetric Efficiency

Input Power kW

100Output Flow L/min

Efficiency %■ Performance Characteristic Curve

AR Series

Typical Pump Characteristics of Type AR22 at Viscosity 20 mm2/s [ISO VG32 Oils, 50°C]■ Input Power
N＝1500 r/min

10P＝14P＝106

P＝ 8P＝ 64P＝ 4P＝ 2210203040

Output Flow L/min

P＝12P＝106P＝ 8P＝ 64P＝ 4P＝ 22P＝ 10P＝MPa
P＝148P＝12Input Power kW

Input Power kW

8N＝1800 r/min

10P＝MPa50

P＝ 1010203040

Output Flow L/min50Note) The dotted line in the graph indicates less than minimum adjustable flow.

■ Full Cut-off Power■ Drain
1.5

1.0

Drain L/min

Full Cut-off Power kW

1800 r/min

nmi0 r/180

min0 r/0.5150

Full

1.0offCut-1500 r/min

0.5l
Full F04812Full Cut-off Pressure MPa

1604own/mi00r
810,150
812Pressure MPa

16■ Noise Level [One meter horizontally away from pump head cover]
N=1500 r/min

70

Full Flow

60
50
Full Cut-off
40048

Pressure MPa

1216

N=1800 r/min

80

Noise Level dB(A)Noise Level dB(A)8070Full Flow

60
50
40

Full Cut-off048

Pressure MPa

AR Series Variable Displacement Piston Pumps

1216A-19

Response Characteristics Change in Accordance with Circuits and Operating Conditions.
■ Test Circuit Conditions■ Result of Measurement
t1Hydraulic High Pressure Hose3/4”×1 m

SOLt2Pressure● Circuit

PSP12 MPa

2 MPa

TimeSOLMOFFMO

AR1616AR22OFF

Response Timems

Full Cut-off Pressure
P1MPa

Model

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

ONt1

t2

Overshoot Pressure
PsMPa

120

90

3.6

90

100

5.2

Axial Port Type

Fully Extended
100.5
4.79
4.76

Suction Port
19 Dia.

22.2
32.5 32.5

Discharge Port
Rc3/4 Thd.

10147
“PG”
172
“P”
“S”

106
130

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

Side Port Type
AR16-FR01＊S
AR22-FR01＊S

Drain Port
Rc3/8 Thd.

47.6

M10 Thd. 17 Deep
2 Places

22.2
158

Suction Port
19 Dia.

74“S” 74“P”
Discharge Port
Rc3/4 Thd.

● For other dimensions, refer to “Axial port Type”.

A-20

AR Series Variable Displacement Piston Pumps

Pressure Adj. Screw
13 Hex.
INC.

76

Pressure Gauge
Connection
Rc1/4 Thd.

19.05
Dia.
19.02
21.24
21.08
82.55
Dia.
82.50

47.6

77

M10 Thd. 17 Deep
2 Places

31Fully Extended 195.5 44.5
68
6.5
32 497

Flow Adj. Screw
13 Hex.
DEC.
64 60
“PG”

Lock Nut
13 Hex.

Fully Extended 165.5

119

Filling Port★
21 Hex. Head Plug Furnished
Drain Port
Rc3/8 Thd.

Lock Nut
13 Hex.

11

AR16-FR01＊
AR22-FR01＊

158

95 Dia.

PISTON PUMPS

AR16-FR01
AR22-FR01

26

1315

33

2124

1230

11

10

23

14

32

38

6

1935

34

4Z

312729AR Series■ Spare Parts List

11617Z

2025
3

43
42

51

52

91939

54

55

56

53

28

57

540

859

63

60

58

2261

37

41

723662

Section Z-Z● List of Seals and Bearings
Part Numbers

Item

Name of Part5Gasket

17Bearing

19Bearing20

Oil Seal

TCN 254511

130O-Ring

OR NBR-90 P9-N

331O-Ring

OR NBR-70-1 P8-N

132O-Ring

OR NBR-90 P14-N

154O-Ring

AS 568-018 (NBR-70-1)

162O-Ring

OR NBR-90 P10-N

1AR16-FR01

AR22-FR01

Qty.

1302-PK314545-5

16305

1

HMK 1715 V2

Z30-1303-PK410300-8

AR Series Variable Displacement Piston Pumps

1A-21