Hydraulic Drive Systems for Engine Cooling Fans

Bucher Hydraulics has developed an ideal system based on tried and tested components. It consists of the AP212 external gear pump, the APM212 fan drive motor and the ESLF 101 electronic control unit.

The external gear pump is available in various models and flange configurations, including those required for direct flange-mounting on all common internal combustion engines.

The fan drive motor is designed on the "building block" principle and can be supplied with the following options:

  • Outrigger bearing to support radial and axial loads
  • Integral anti-cavitation make-up valve
  • Integral control valves that are regulated electro-proportionally, electrically on/off or thermostatically
  • Drain port
  • High-pressure shaft seal
  • Right-hand, left-hand or reversible rotation
Hydraulic Drive Systems for Engine Cooling Fans
  • The internal combustion engine reaches its optimum operating temperature quickly
  • Over-heating damage is prevented by monitoring and controlling up to 3 system values
  • Fail-safe function in the event of system failure 
  • Demand-regulated cooling:
    - less energy consumption
    - lower noise levels 
  • Reversible - leaves, dirt, etc. can be blown out of the radiator
  Type File extension Size
APM212_200-P-991231-en Catalog / Data sheet PDF 6.4 MB

Technical data

AP212 external gear pump

 

Unit

Value

Pressure differential - constant

bar

250

Geometric displacement

cm³/rev

4,4 - 26,2

Fluid temperature

°C

-20 to +80

Viscosity range (recommended)

mm²/s

20 - 120

APM212 fan drive motor

 

Unit

Value

Max. speed

rpm

4000

Pressure differential - constant

bar

250

Geometric consumption

cm³/rev

8,4 - 26,2

Fluid temperature

°C

-20 to +80

Viscosity range (recommended)

cm²/s

20 - 120

Maximum tank pressure without drain line

bar

20
 

          

Fan drive control unit

 

Unit

Value

Power supply

 V DC

12 - 28

Temperature inputs

 

3 (T1/T2/T3)

Temperature sensor processing

PTC or NTC using 2-wire method

per card

Temperature control range

°C

0 - 100

Diagnostics

 

LED for each sol. output
LEDs for control mode 

Temperature range

°C

-20 to +50