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Eaton 2000 Series – Geroler Motor (Two speed)

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The Eaton 2000 Series motors are available with an integral two speed feature that changes the displacement in a ratio of 1 to 2 and shifts the motor from a low speed high torque (LSHT) mode to a high speed low torque (HSLT) mode. The open center selector valve shifts the speed mode from low to high speed when pilot pressure of 6.9 D Bar [100 D PSI] minimum is applied to the pilot port (6.9 Bar [100 PSI] higher than case pressure). In the high speed mode torque values are approximately one half with twice the speed of the conventional 2000 Series single speed motors.

An external two position three way valve is required for shifting the pilot pressure port between signal pressure (HSLT) and low pressure (LSHT).

Two speed motors are available with a return line closed center shuttle for closed circuit applications. Low speed high torque mode is the normal position of the speed selector valve. When a differential pressure is supplied to the pilot port and 6,9 Bar [100 PSI] is reached, the selector valve overcomes the return spring force and the spool shifts to the high speed mode. The oil in the opposite side of the spool is drained internally. Pressure between the pilot supply and case drain or return line (depending on open or closed circuit system) must be maintained to keep the motor in the high speed mode.

When pilot pressure is removed from the pilot port the pressure in the pilot end of the spool valve is relieved and drained back through this three way valve, the spring force returns the spool valve to LSHT position. Pilot pressure may come from any source that will provide uninterrupted pressure during the high speed mode operation. Pilot pressure 6,9 D Bar [100 D PSI] minimum, up to the full operating pressure of the motor.

In normal LSHT operation the Char-Lynn two speed motor will function with equal shaft output in either direction (CW or CCW), the same as the single speed Char-Lynn disc valve motors.

However, to prevent cavitation in the HSLT mode, the preferred direction of shaft rotation is counter clockwise (port B pressurized). This unique disc valve is not symmetrical in porting the fluid for the HSLT mode. Consequently, when the pressure is reversed for HSLT CW rotation, cavitation can occur. Installing a restriction (200 psi or more depending on flow) in the hydraulic line that connects port B will prevent cavitation.

If you are operating in a critical area and a restriction in the hydraulic line causes concern, these two speed motors can be ordered timed with CW preferred HSLT shaft rotation. Hence, with this option port B will have to be pressurized for CW preferred HSLT shaft rotation. The restriction recommended for the line connecting port B remains unchanged.

Finally in closed circuit applications a hydraulic line restriction is not required. Instead, the charge pump can be used to supply and maintain a minimum pressure of 14 Bar [200 PSI].

Product Specification

High Speed Mode

Displacement Max Speed Flow Torque Pressure Weight
 40 cm³/r  1000 RPM 45 L/min 100 Nm
{145 Nm}
205 bar
{310 bar}
13.8 kg
 50 cm³/r  1000 RPM  55 L/min  125 Nm
{185 Nm}
 205 bar
{310 bar}
 14.1 kg
 65 cm³/r  990 RPM  70 L/min  165 Nm
{240 Nm}
 205 bar
{310 bar}
 14.3 kg
 80 cm³/r  860 RPM  75 L/min  195 Nm
{240 Nm}
 205 bar
{260 bar}
 14.5 kg
 95 cm³/r  700 RPM  75 L/min  240 Nm
{300 Nm}
 205 bar
{260 bar}
 15.0 kg
 120 cm³/r  560 RPM  75 L/min  300 Nm
{375 Nm}
 205 bar
{260 bar}
 15.4 kg
 155 cm³/r  450 RPM  75 L/min  380 Nm
{440 Nm}
 205 bar
{240 bar}
 15.9 kg
 195 cm³/r  350 RPM  75 L/min  365 Nm
{445 Nm}
 155 bar
{190 bar}
 16.3 kg
 245 cm³/r  230 RPM  75 L/min  448 Nm
{486 Nm}
 120 bar
{140 bar}
 16.8 kg

 

Low Speed Mode

Displacement Max Speed Flow Torque Pressure Weight
 80 cm³/r  500 RPM 45 L/min 235 Nm
{345 Nm}
205 bar
{310 bar}
13.8 kg
 100 cm³/r  500 RPM  55 L/min  295 Nm
{445 Nm}
 205 bar
{310 bar}
 14.1 kg
 130 cm³/r  495 RPM  70 L/min  385 Nm
{560 Nm}
 205 bar
{310 bar}
 14.3 kg
 160 cm³/r  430 RPM  75 L/min  455 Nm
{570 Nm}
 205 bar
{260 bar}
 14.5 kg
 195 cm³/r  350 RPM  75 L/min  540 Nm
{665 Nm}
 205 bar
{260 bar}
 15.0 kg
 245 cm³/r  280 RPM  75 L/min  660 Nm
{820 Nm}
 205 bar
{260 bar}
 15.4 kg
 305 cm³/r  225 RPM  75 L/min  765 Nm
{885 Nm}
 205 bar
{240 bar}
 15.9 kg
 395 cm³/r  175 RPM  75 L/min  775 Nm
{925 Nm}
 155 bar
{190 bar}
 16.3 kg
 490 cm³/r  115 RPM  75 L/min  845 Nm
{930 Nm}
 120 bar
{140 bar}
 16.8 kg
  •  Values shown within {} are Intermittent all other values are Continous

Eaton – 2000 Series – Geroler Motor (Two speed) – Datasheet

Additional Information

Hydraulic Motors

Geroler

Manufacturer

Eaton

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