Version 2.10 1/10/2005

5 HYDROSTATIC TRANSMISSIONS5 HYDROSTATIC TRANSMISSIONS

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Hydrostatic Transmission Layouts

P TE AM

PE

M

P

M

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Hydrostatic Transmission Layout

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Fixed & Variable Displacement Pump

With Fixed Displacement Motor

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Fixed & Variable Displacement Pump

With Variable Displacement Motor

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RF

N

Hydrostatic Pump Operation

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Hydrostatic Motor Operation

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Main Loop

Pump Motor

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Case Drain

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Reservoir

IN

OUT

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Reservoir

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Charge Pump

Suction oil

Pump flow

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Charging The Loop

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Filter

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Filter

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Charge Pump Relief Valve

Suction oil

Pump flow

To pump case drain

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Charge Pump Relief Valve

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Multi Function Valves

Charge pump

Main Loop

Servo piston

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Multi Function Valves

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Direction Control Valve

Case drain

Charge pump

Main Loop

Main Loop

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Direction Control Valve

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Direction Control - PWM Pilot Control Valve

From the charge pump Case drain

To the Forward and Reverse servo pistons

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Direction Control

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Cooling - Oil Cooler and Bypass Valve

To the reservoir

Case drain oil

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Cooling - Loop Flush and Purge Relief Valves

Case drain

Motor

Motor

Purge Relief Valve

Loop Flush valve

Main Loop

Main Loop

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Cooling Components

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System Schematic

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Hydrostatic Pump

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Drive Motor

5

6

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Multi function valve

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Multi function valve

Charge check valve

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Multi function valve

Pressure limiter (420 bar)

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Multi function valve

High pressure relief valve (450 bar)

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Multi function valve

Bypass valve

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Drive Motor Flushing Valve

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Oil cooler bypass valve