How Does a Hydraulic Cooling Fan Operate

Detailed animations show internal components. The pipe can be any shape or length--all it needs to do is separate the two.

Technical Curiosities The Hydraulic Cooling Fan Spannerhead

Hydraulic Cooling Fan.

. The PCM controls a solenoid which controls the fan speed based on the temperature of the engine and the demand for the A C system. This air flow removes heat from the coolant created by the engine using the radiator as a conductor. When the motor is shut of and cool the fan will spin freely by hand.

There are 2 hydraulic type hoses that appear to go down to the tranny or the back of the motor. I checked the owners manual and confirmed with Monaco service that the fluid. This jeep uses a hydraulic fan motor to spin the cooling fan as opposed to an electric motor or direct drive from the water pump.

Anything you can do to alleviate the problem will fall into one of the above two categories. Discussion Starter 1 Sep 30 2009. If the coil has no resistance it is open and has failed.

The fan speed increases as the pressure rises. You can set up an electric fan to circulate air around the. A good relay coil will typically read 40 to 80 ohms.

This should reduce internal leakage and therefore reduce the heat load on the system. One from each side of the fan housing. The hydraulic system again helped in this case and the force required to initiate pilot efforts was decreased significantly.

Allowing it to deplete will compromise its performance. The car is running HOT but the temp. Joined Sep 21 2009 145 Posts.

It provides only the cooling that is required throughout the operating range of the vehicle including such requirements as the maximum engine rated torque point where high cooling may be required at lower than maximum engine speed. It also makes a lot of noise. After reassembly the tech topped off the reservoir with 1 12 gallons of AW 47 hydraulic oil.

Make sure airflow to and around the reservoir is unobstructed. Two pistons are positioned into two glass cylinders that are filled with oil. How a Radiator Cooling Fan Works The engine cooling fan is designed to move air through the radiator when the vehicle is at slower speeds or stopped.

It appears to have a hydraulic fan run off the transmission. Maintain the level of your hydraulic fluid. Or it may not work when electrical loads are high.

A hydraulic system works because the force that is applied at a point is transmitted to a second point by using an incompressible fluid. Learn what makes a viscous fan clutch operate. Posted February 17 2012.

The fan control solenoid regulates flow to the hydraulic motor by pulsing the power steering fluid based on commands from the fan control module FCM. The hydraulic fan drive creates airflow through the engine-cooling radiator and the charge air cooler. An oil-filled pipe connects them to one another.

The fan is running all of the time although slowly and I can stop it with my hand 50-100 rpm. Hydraulic systems continue to be made use of in various areas as of today. When the motor is started the fan will spin slowly.

When commanded to increase pressure the piston pump increases its displacement to increase flow. As it was declared that hydraulic oil cooling systems are a necessity they are continually used for keeping the system running as good as ever. If resistance is high the coil may still be working but it is failing.

A hydraulic fan motor is a mechanical device meaning that there are no energy state changes occurring on a large scale in a hydraulic motor where an electric motor actually takes energy from mechanical to electrical and then back to mechanical during use creating losses each time. Here are some steps you can take to ensure the system remains effective. I have a 94 Camry V6 with the most complicated cooling system Ive ever seen.

So I went to the PNP today and I saw something interesting that got me thinking a lexus 300es with a 1MZ-FE had a hydraulic cooling fan on the radiator. Briefly how does a hydraulic cooling fan operate. The simplest and least-expensive hydraulic fan drive uses a fixeddisplacement pump driving a fixed-displacement motor with a pressure-control valve to regulate motor torque fan speed.

The ability of your system to regulate its temperature depends upon there being a sufficient volume of fluid. Just had the radiator rebuilt and the RR resulted in loss of fluid from the Hydraulic system that powers the cooling fans and power steering. For example you can reduce the load power draw on the system.

Increase heat dissipation from the system. The system operates by commanding a Pulse Width Modulated signal to the proportional pressure compensator on the piston pump. The Power Steering Pump supplies fluid to the fan assembly in these systems.

A hydraulic fan motor directly drives the engine Modulated fan speed will depend on the amount of oil flowing through the fan motor. If the fan is running full bore with the engine at 1000 RPM it should suck a piece of cardboard to the side grill of the radiator and hold it there and resist being removed. An engine cooling fan is temperature controlled to only run when needed.

This one was out while a ne. The hydraulic radiator fan has a two stage G-rotor hydraulic motor thats powered by high pressure power steering fluid provided by the power steering pump. The oil flow is measured in gallons per GPM minute.

A local garage quoted a fan replacement. The fan defaults to run full bore you have to supply 12 volts to the fan solenoid in order to slow the fan down. There is a line from the power steering reservoir that goes to the top of the fan motor.

A hydraulic fan drive system allows variable fan speed independent of the engine speed. Jump to Latest Follow 1 - 7 of 7 Posts.

2

Technical Curiosities The Hydraulic Cooling Fan Spannerhead

Hydraulic Radiator Cooling Fan Motor Youtube

Share this post