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9 EATON 420 Mobile Piston Pump Technical Manual E-PUPI-TM002-E4 November 2014

Control Options

Torque Control

The 420 Torque Control limits the power input to the pump

preventing the engine from stalling while also optimizing the

use of the engine power.

When combined with Pressure Compensator Control and/or

Load Sense (refer to page 7) it will allow the 420 to remain

inside the power envelope of the Pressure Flow curve.

When the combination of pump ow and outlet pressure

moves outside the envelope, the pump displacement will

automatically be reduced.

This maximum setting is easily calculated using the

following steps:

1. Select the 420 pump displacement you intend to use

2. Identify the available engine horsepower (HP) and speed (rpm)

3. Calculate the torque limit required by the system using the

equations shown

4. Select the MAX torque setting from the table shown

Code Torque Setting 41cc 49cc 62cc 80cc

AA 40 Nm (350 in-lbs)   — —

AB 51 Nm (450 in-lbs)   — —

AC 62 Nm (550 in-lbs)    —

AD 73 Nm (650 in-lbs)    

AE 85 Nm (750 in-lbs)    

AF 96 Nm (850 in-lbs)    

AG* 107 Nm (950 in-lbs)    

AH 119 Nm (1050 in-lbs) —   

AJ 130 Nm (1150 in-lbs) —   

AK 141 Nm (1250 in-lbs) —   

AL 153 Nm (1350 in-lbs) — —  

AM 164 Nm (1450 in-lbs) — —  

AN 175 Nm (1550 in-lbs) — —  

AP 186 Nm (1650 in-lbs) — —  

AR 198 Nm (1750 in-lbs) — —  

AT* 209 Nm (1850 in-lbs) — —  

AU 220 Nm (1950 in-lbs) — —  

* reference 62cc

0 1000 2000 3000 4000

Pressure (PSI)

Flow (GPM)

Power Curve*

35%

75%

Full Flow Pressure for

Torque Limit Setting

500

1000

1500

2000

2500

3000

0 1000 2000 3000 4000

Pressure (PSI)

Torque (lbf-in)

Torque Curve*

without Torque Control

with Torque Control

35%

75%

62cc AT

62cc AG

Pressure

Limit

Setting

“F” Case

Drain

“B” Inlet

“C” Outlet

To Load

“J” Load

Sense

Signal Port

See Page 7 for Pressure Compensator

Control and Load Sense

Torque = Horsepower (HP) x 63025 Torque = Horsepower (KW) x 9550

(in-lbs) Engine RPM (Nm) Engine RPM

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 42 43

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