What mobile applications use hydraulic fan drives?

• Off-road vehicles ( bulldozers, back-hoes e.t.c.)
• Agriculture
• Trains ( Engine & Transmission Cooling & Air Conditioning)
• Military Vehicles 
• On-Road vehicles ( buses, trucks?? e.t.c.)

Why Use Hydraulic Fan Drive ?

Some application cool themselves with their transport speed (trucks) but some machines are static (excavators) so need "forced" ventilation.

It is strange to have a 300 HP engine rev-up for a 10 HP cooling requirement. It is an energy waste and adds-up to heat into the system.

Noise reduction and efficiency improvements require proportional control for the fan speed.

Other reasons to use a hydraulic fan drive system are:

• On some machines maximum fan speed is only required approximately 5% of time.
• Some zones are hotter than others can 'grab' control.
• Overheating damages the connected systems and components.
• Under cooling reduces engine efficiency and life.
• Over-cooling prevents correct vaporization of fuel. Reduces combustion efficiency, wasted fuel and emissions.
• You can reverse the fan direction to clean the fan.

Hydraulic Fan Drive Systems are used in systems for 3 main reasons:

1-Reduce Engine Emissions

• Use less fuel
• Runs at correct temperature
• High speed fan only when required
• Easier to meet Tier 3 & 4 engine emission standards
• Cooling profiles - different machines or areas

2-Increase Cooling System Efficiency

• Cooling on demand. No parasitic losses.
• Higher cooling at low or idle engine RPM.
• High power to weight ratio.
• Located anywhere in target application.
• Improved air flow through radiator.
• Reversible - purge clogged radiators.

3-Increase Vehicle Productivity

• Frees up horse power. Here you can see efficiency improvement figures.
• Reduced noise levels to meet new global legislations
• Less down time, high reliability component life cycles
• Less costly system maintenance
• No pulleys/belts to tighten or replace

Choosing correct circuit and products for hydraulic fan drive system is crucial.

Circuit Types can be

• Standalone
• Integrated/Combined
• Known Patent Issues

Motor Types

• Gear
• Vane
• Piston

Pump Types

Fixed Displacement

• Gear
• Vane
• Piston

Variable Displacement

• Piston

Fan drive Manifold Blocks

• Standalone
• Integrated

Controllers

• Dedicated
• Generic

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