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Message: <blockquote data-quote="SkidTracks" data-source="post: 142737" data-attributes="member: 5570">After Bobcat failing to fix dust and dirt problem, and trying a couple of my own unsuccessful workarounds; only viable solution I came up with was to replace T86, which I did.As a heads up: If you live/work in sometimes dusty area and are looking to buy a Bobcat T86, S86, T76, or S76 ** - make sure to test cab for air leaks and cab has positive pressure.Checking for positive cab pressure: Plastic sheet (garbage bag) taped over a 1/2" cracked open window should blow outward from cab when engine cooling fan is turning (normal direction).  Should bag collapse, be pulled inward to cab, cab is not pressurized and is under a slight vacuum.Checking for air leaks into cab:  Where dust and dirt is sucked in at, requires mechanics smoke machine or fake fog machine (often used on Halloween) and helper.   Someone in cab watching for smoke / fog, and person moving smoke / fog machine around cab, staying clear of cab's external air filter intake.  First place to check is by cab's headlights.** I know of another T86 which had same dust and dirt problem.  According to PPM air quality meter, air inside was dirty than outside.  Like mine, dust and dirt which had been sucked in to cab had gotten into A/C ducting and vents, despite internal cab filter.</blockquote>