You need the outside air to pressurize the cab. This is what keep more dust out of the cab.
If your getting lots of dust in a 20 series cab then you have some thing wrong:
1) First remove the plate on top of the cab. This covers the evaporator and heater cores. Clean everything up real well with compressed air and vacuum cleaner. Then make sure all of the hoses are sealed where they come into the box that has all of the AC/HEAT components in it. Then make sure the gasket is good between the cover and housing.
2) Door seal condition and fit. It they are rock hard they will not seal. If the door latch is not adjusted right the door will not fit the opening correctly.
3) Pull the dash out and make sure all the grommets and sealing material around the wiring harnesses are good.
4) Inspect the gear shifter boot. They stick down in side and they seem to attract mouse holes.
5) Look at the rubber seals around the tilt steering column. They get stiff with age and do not flex into place like they should.
6) Check the fit and condition of the power shaft cover that your setting on. LOL The rubber seals around it often get damaged when working under the seat. Also seem to attract mice.
IF you do this your cab will be as clean as any JD cab out there. The trouble is the newest JD 20 series cab is 28 years old. Lots of little leaks mean the cabs get dust in them.
I have a JD 1989 6620 Side hill combine. It is one of the last twenty ever built. It has 2200 hours on it. Several years ago I spent 2-3 days doing what I just explained to you. The cab stays clean now.
P.S. Make sure the fan motors are running at full speed and that the blower wheels have all there fins. IF either of these two things are not right you will not have the pressurization you should and you will have a dusty cab.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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