Medium Duty Piston Pump

Model 70422, 38 cm3/r [2.32 in3/r] and

Model 70423, 45.4 cm3/r [2.77 in3/r]
Pressure
Port

Load
Sensing
Line
Port

Pressure and Flow

Compensated Pump
Suction Port

Pressure
Port

Pressure
Compensated
Pump Suction Port

Model 70422 Model 70423

Specification Metric Units U.S. Units Metric Units U.S. Units
Mounting Flange 2 Bolt SAE “B” Mount 2 Bolt SAE “B-B” Mount
Maximum Displacement / Rev 0 to 38 cm3/r 0 to 2.32 in3/r 0 to 45 cm3/r 0 to 2.77 in3/r
Flow @Rated Speed and PSI 98,4 l/min. 26.0 GPM 125 l/min. 33 GPM
Maximum Rated Speed 2700 RPM 2700 RPM 3000 RPM 3000 RPM
Continuous Rated Pressure 210 bar 3000 PSI 210 bar 3000 PSI
Maximum Intermittent Pressure 275 bar 4000 PSI 265 bar 3800 PSI
Continuous Allowable Case Pressure 2 bar 25 PSI 2 bar 25 PSI
Maximum High Pressure Setting @ Zero Flow Std. 210 bar Std. 3000 PSI Std. 210 bar Std. 3000 PSI
Low Pressure Setting @ Zero Flow Std. 14 bar Std. 200 PSI Std. 14 bar Std. 200 PSI
Compensator Response @ Rated PSI and RPM 8 mil. sec. 8 mil. sec. 18 mil. sec. 18 mil. sec.
Compensator Recovery @ Rated PSI and RPM 42 mil. sec. 42 mil. sec. 75 mil. sec. 75 mil. sec.
Maximum Continuous Inlet Vacuum 0,91 bar absolute 3 in. Hg. 0,94 bar absolute 2 in. Hg.
Max. Thrust Load Into Pump and Shaft Side Load, for Consult an Eaton representative and/or Consult an Eaton representative and/or
Input Shaft. Eaton engineering. Eaton engineering
Maximum Continuous Inlet Temperature 107°C 225° F 107°C 225° F
Minimum Operating Temperature -29° C -20° F -29° C -20° F
Weight per single pump 12,3 kg 27 lbs. 11,8 kg 26 lbs.

11
Medium Duty Piston Pump

Model 70422 Performance Data

The charts below are representative of a 38 cm3/r [2.32 in3/r] Pressure-Flow Compensated Piston Pump. The tests
were run at an oil temperature of 82°C [180°F] with viscosity 7 - 9 cSt [50 - 54 SUS] and the pump at maximum
displacement.
Percentage 70 bar [1000 PSI] Overall Efficiency 210 bar [3000 PSI]

85

80

75

70

500 1000 1500 2000 2500 3000

Shaft RPM

Percentage 70 bar [1000 PSI] Volumetric Efficiency 210 bar [3000 PSI]

100

95

90

85

500 1000 1500 2000 2500 3000

Shaft RPM

Liters 70 bar [1000 PSI] Outlet Flow 210 bar [3000 PSI] [Gallons]
105
90 [25]
75 [20]
60 [15]
45
[10]
30
[5]
15

500 1000 1500 2000 2500 3000

Shaft RPM

Kilowatts 70 bar [1000 PSI] Input Power 210 bar [3000 PSI] [Horsepower]

50
[60]
40
[45]
30
[30]
20

10 [15]

500 1000 1500 2000 2500 3000

Shaft RPM

Stand-By Power
Kilowatts 14 bar [200 PSI] @ Zero Flow 210 bar [3000 PSI] [Horsepower]
7
6 [8]
@ Zero Flow
5
[6]
4
3 [4]
2
[2]
1
@ Zero Flow

500 1000 1500 2000 2500 3000

Shaft RPM
12
 Medium Duty Piston Pump

Model 70423 Performance Data

The charts below are representative of a 45 cm3/r [2.77 in3/r] Pressure-Flow Compensated Piston Pump. The tests
were run at an oil temperature of 82°C [180°F] with viscosity 7 - 9 cSt [50 - 54 SUS] and the pump at maximum
displacement.
Percentage 70 bar [1000 PSI] Overall Efficiency 210 bar [3000 PSI]

75

70

65

60

500 1000 1500 2000 2500 3000

Shaft RPM

Percentage 70 bar [1000 PSI] Volumetric Efficiency 210 bar [3000 PSI]

100

95

90

85

500 1000 1500 2000 2500 3000

Shaft RPM

Liters 70 bar [1000 PSI] Outlet Flow 210 bar [3000 PSI] [Gallons]
130
110 [30]

90 [25]
[20]
70
[15]
50
[10]
30

500 1000 1500 2000 2500 3000

Shaft RPM

Kilowatts 70 bar [1000 PSI] Input Power 210 bar [3000 PSI] [Horsepower]

50
[60]
40
[45]
30
[30]
20
10 [15]

500 1000 1500 2000 2500 3000

Shaft RPM

Stand-By Power
Kilowatts 14 bar [200 PSI] @ Zero Flow 210 bar [3000 PSI] [Horsepower]
7
6 [8]
ow
5 @ Zero Fl
[6]
4
3 [4]
2
[2]
1
@ Zero Flow
500 1000 1500 2000 2500 3000
Shaft RPM
13
Medium Duty Piston Pump

Model 70422 and 70423 Code

The Model 70422 and 70423 Pressure or Pressure-Flow Compensated Piston Pumps are specified by the following model
code. Once a pump is built from the model code, a product number will be assigned to that arrangement.
In using the model code make sure all positions are selected within the 21 digit code for each pump.

Code Example: AAG R A F 0 1 0 1 0 A A 0 0 0 0 0 A 0 0

Position - 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21

0 1 0 0 0 0 A 0 0
Position 1, 2, 3 - Code Title
AAG = Model 70422, 38 cm3/r [2.32 in3/r] Allleft(CCW)orright(CW)directions
Pressure or Pressure-Flow Compensated Piston Pump givenareviewed fromtheinputshaft
AAH = Model 70423, 45,4 cm3/r [2.77 in3/r] end of the pump.
Pressure or Pressure-Flow Compensated Piston Pump

Position 4 - Input Shaft Rotation

R = Righthand Rotation (CW)
L = Lefthand Rotation (CCW)
Code AAG AAH
Position 5, 6 - Input Shaft
AA = 15 Tooth 16/32 Spline, Shaft Extension 46 [1.81] AA Opt. Std.
AF = 13 Tooth 16/32 Spline, Shaft Extension 41,1 [1.62] AF Std. Opt.
AM = Straight Shaft Dia. 22,2 [.875], Keyway 6,3 [.25] x 25 [1.0], Shaft Extension 41,1 [1.62] (Key Included) AM Std. Opt.
AN = Straight Shaft Dia. 25,4 [1.00] , Keyway 6,3 [.25] x 29,5 [1.16] , Shaft Extension 46 [1.81] (Key Included) AN Opt. Std.

Position 7, 8 - Pressure Compensator Setting

01 = 210-215 bar [3000-3100 PSI] Note: Consult an Eaton representative for 01 Std. Std.
additional settings from 35 bar [500 PSI] min.
Position 9, 10 - Flow Compensator Setting
00 = No Flow Compensator Note: Consult an Eaton representative for 00 Std. Std.
01 = 13,1-14,5 bar [190-210 PSI] additional settings to a max. of 31 bar [450 PSI] 01 Std. Std.

Position 11 - Compensator Special Features

0 = No Special Feature 0 Std. Std.
A = Bleed Off A Opt. Opt.

Position 12 - Main Ports, Size and Location

A = 1.625 -12 UN Suction Port; 1.3125-12 UN Pressure Port; - SAE Straight Thread O-ring Ports - Rear A Std. Std.
B = 1.625 -12 UN Suction Port; 1.3125-12 UN Pressure Port; - SAE Straight Thread O-ring Ports - Opposite Sides B Std. Std.

Position 13 - Drain Port, Size and Location

A = .5625-18 UNF - SAE Straight Thread O-ring Port - Right Side of Housing A Std. Std.
E = .5625-18 UNF - SAE Straight Thread O-ring Port - Right and Left Side of Housing E Opt. Opt.

Position 14 - Auxiliary Rear Mounting

0 = No Auxiliary Mounting 0 Std. Std.
B = [2-Bolt A] SAE Flange Series 82-2 with a 9 Tooth 16/32 Intl. Spline, Accepts 38,1 [1.50] Shaft Extension B Opt. Opt.
C = [2-Bolt A] SAE Flange Series 82-2 with a 9 Tooth 16/32 Intl. Spline, Accepts 38,1 [1.50] Shaft Extension, with Cover Plate C Opt. Opt.
D = [2-Bolt B] SAE Flange Series 101-2 with a 41 Tooth 48/96 External Spline, Accepts 24,9 [.98] Shaft Extension D Opt. Opt..

Position 15 - Maximum Displacement Option

0 = As Given in Code Title 0 Std. Std.

Position 16, 17 - Special Features

00 = No Special Features 00 Std. Std.

Position 18, 19 - Paint

0A = Primer 0A Std. Std.

Position 20 - Identification
0 = Standard 0 Std. Std.

Position 21 - Design Code

0 = Eaton assigned design code 0 Std. Std.

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 Medium Duty Piston Pump

Model 70422 and 70423

Installation Drawings
Rear Porting Case Drain Port
114,9 [4.52]

98,3 [3.87] (Optional RH Side) 12,2 9,5 [.38]

9/16-18 UNF [.48]

Pressure
Port 33,3
[1.31]
101,57±,03
[3.999±,001] Dia.

Suction
Port
35,8
[1.41] 71,4 187 [7.36]
[2.81] 232,2 [9.14]
Right Hand Rotation Flow Compensator Load Sensing Port
Clockwise 7/16-20 UNF

For Shaft Configuration 174,8 [6.88]

Case Drain Port
See Separate Drawings. 146,1 [5.75]
98,3 [3.87] (Optional LH Side)

Pressure
Port
93,3 88,1
[3.67] [3.47]

72,1
[2.84]
Mounting Holes for
Suction 12,7 [.50] Dia. Bolt
35,8
Port 114,9 [4.52] 2 Holes
71,4 [1.41]
191,4 [7.54]
[2.81]
Left Hand Rotation
Counter Clockwise
Opposite Side Porting

Pressure
Port

Suction Pressure
Port Port Suction
Port

168,1 [6.62] 168,1 [6.62] 171,4 [6.75]

Right Hand Rotation Left Hand Rotation
Clockwise Counter Clockwise

15
 Medium Duty Piston Pump

Model 70422 and 70423

Installation Drawings
Opposite Side Porting Accepts an "A" Auxiliary Mounting Flange and 9 Tooth, 16/32 DP
with 2 Bolt "A" Auxiliary Rear Mounting 30 degrees Involute Flat Root, Class 1, Side Fit Spline, S.A.E. J498b.
Units Driven By this spline must not require more
3/8-16 UNC-2B
than 74,6 N•m [660 lbf•in]
19 [.75] deep,
Pressure 2 places
Port

30° 30°
82,63±,03
[3.253±.001]
Suction Dia.
Pressure
Port Port
Suction
106,35 106,35 7,9
3/8-16 UNC-2B Port
[4.187] [4.187] [.31] 171,4 [6.75]
19 [.75] deep, 2 places
205,5 [8.09]
Right Hand Rotation Left Hand Rotation
Clockwise Counter Clockwise

Opposite Side Porting

with 2 Bolt "B" Auxiliary Rear Mounting
93,7 [3.69] Case Drain Port 114,9 [4.52]
(Optional RH Side) 12,2 9,5 [.38]
9/16-18 UNF [.48]

28,5
[1.12]
30°
101,57±,03
Pressure [3.999±.001] Dia.
Port Suction
Port
146
1/2-13 UNC-2B, For Shaft Configuration
[5.75]
2 Places See Separate Drawings.
Left Hand Rotation 217 [8.53]
Counter Clockwise
Flow Compensator Load Sensing Port 174,8 [6.88]
7/16-20 UNF 146,1 [5.75]
93,7 [3.69] 28,5
45° 159,7 [6.29] [1.12]

Pressure 117,3
Port [4.62]
30°
101,68±,03
Suction [4.003±.001]
Port Dia.
72,1
[2.84]

146 1/2-13 UNC-2B,

[5.75] 2 Places 10,4 114,9 [4.52] Mounting Holes for
[.41] 12,7 [.50] Dia. Bolt
171,4 [6.75] 2 Holes
Right Hand Rotation Accepts an "B" Auxiliary
Mounting Flange and 41 Tooth, Case Drain Port
Clockwise
48/96 DP 45 degrees (Optional LH Side) 9/16-18 UNF
Involute Fillet Root, Class 1, Side Fit Spline.

16
Medium Duty Piston Pump

Model 70422 and 70423

Installation Drawings
Input Shafts 46,0 41,1
[1.81] [1.62]

Shaft Shaft
AA AF
Maximum Maximum
Input Torque 24,981 [.9835] Dia., 15 Tooth Input Torque 22,2 [.875] Dia., 13 Tooth
337,5 N·m 16/32 DP 30 Degree 209,3 N·m 16/32 DP 30 Degree
[2987 lbf·in] Involute Flat Root, Class 1 [1852 lbf·in] Involute Fillet Root, Class 1
Side Fit Spline, S.A.E. J498b Side Fit Spline, S.A.E. J498b

41,1 46,0
[1.62] [1.81]
3,0 [.12] 3,0 [.12]
6,3 [.25] wide 6,3 [.25] wide
x 24,6 [.97] x 28,4 [1.12]
Lg. Key Lg. Key
24,94 ±,12 28,095 ±,125
[.982 ±.005] [1.106 ±.005]
Shaft Shaft
AM AN
Maximum Maximum
Input Torque 22,23 +,00/-,03 Input Torque 25,4 +,000/-,013
209,3 N·m [.875 +.000/-.001] Dia. 337,5 N·m [1.0000 +.000/-.0005]
[1852 lbf·in] [2987 lbf·in] Dia.

Cover Plate
Fits SAE "A" Auxiliary
Mounting Flange in place of Holes (2) for
auxiliary pump. 9,53 [.375]
A kit (#70142-915) 9,53 Dia. Bolt
includes Cover Plate, 2 Cap [.375]
Screws, and O-ring.

106,35
[4.187]

82,55 ± ,03
[3.250 ± .001]
Dia.
Dimensions are in millimeters [inches],
unless otherwise specified.
17