In the previous blog we explained the importance of efficient phasing cylinder operation in use on Seeding bars. Another hydraulic component that is integral to air seeding is the fan drive motor. This particular motor drives the fan, which in turn generates the air pressure in the air lines used to distribute the seeds. A common issue that can arise from an inefficient fan drive motor is a decrease in air pressure.

What Happens When Your Fan Drive Motor Doesn’t Work

When the air pressure drops the seeds may not have the appropriate force behind them to penetrate the soil, or perhaps they won’t even be able to travel the length of the airline to begin with. Blower speed and pressure does not control the sowing rate, but it is very important that enough air is available to move the required amount of product, from the bin to the top of the secondary head without blockage (too little air volume).

The sowing width of the implement, the size and number of outlets, ground speed, sowing rate of seed and fertiliser, the texture and weight of the material will all have an effect on how much air pressure is required.

The Different Types of Fan Motors

Fan motors traditionally come in two types, Piston and Gear. They each have their pros and cons. Piston motors can run at higher pressures and have greater speed capabilities but are considerably more expensive and less contaminate tolerant. Gear motors generally do not have the same speed and pressure capabilities as the piston motors but are more compact and considerably more cost- effective.

Regular servicing of the motors can increase the overall life of the motor, by picking up any wear that may be occurring before a failure. As a rule, when these motors have a major failure it is not cost-effective to repair, therefore a new motor is required.

If you have any concerns, or just want some advice please give the boys at Gerrard Hydraulics a call and they will be only too happy to assist.