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<blockquote data-quote="SkidTracks" data-source="post: 143024" data-attributes="member: 5570"><p>Hours got to roughly 110. Problem with dust and dirt was there from start. I just didn't know it till usage in dry weather. I inquired several times about problem, but dust and dirt problem was dismissed by dealer's people.</p><p></p><p>Took a while for me to connect dots as to cause. By design, Bobcat had reversed engine cooling fan air flow between M-series and R-series, without relocating fan. At first, I honestly thought dealer had installed Auto-reversing fan cooling option wrong, connecting hydraulic hoses backwards.</p><p></p><p>(<em>see pic - fine arrows are my attempt to show how cab air is sucked down into chassis and pulled into engine area through chassis - fat arrows are Bobcat's showing main airflow</em> of R-series)</p><p>(see video - fog in cab being sucked out into chassis, finally fog from cab being blown out grill above radiator)</p><p></p><p>Bobcat on their M-series talked about how they got engine cooling fan correct compared to their competitors. At one point, Bobcat joking about recognizing one their competitors brand by a dust blown Rooster tail. Ironically, Bobcat ended up reversing air flow, without moving cooling fan to back door, which resulted in R-series doing a Rooster tail. Bobcat's backdoor intake fins point at ground, their competitor's point toward sky.</p><p></p><p>To best I know, <em>(being Bobcat would not converse with me</em>), all large engine R-series (T86, T76, S86, S76) will suffer same dust and dirt cab infiltration problem. And there is no solution to dust and dirt problem, while front part of chassis has negative air pressure, resulting in cab having negative air pressure. (<em>I did verify chassis and cab air pressure was negative with engine cooling fan running</em>).</p></blockquote><p></p>
[QUOTE="SkidTracks, post: 143024, member: 5570"] Hours got to roughly 110. Problem with dust and dirt was there from start. I just didn't know it till usage in dry weather. I inquired several times about problem, but dust and dirt problem was dismissed by dealer's people. Took a while for me to connect dots as to cause. By design, Bobcat had reversed engine cooling fan air flow between M-series and R-series, without relocating fan. At first, I honestly thought dealer had installed Auto-reversing fan cooling option wrong, connecting hydraulic hoses backwards. ([I]see pic - fine arrows are my attempt to show how cab air is sucked down into chassis and pulled into engine area through chassis - fat arrows are Bobcat's showing main airflow[/I] of R-series) (see video - fog in cab being sucked out into chassis, finally fog from cab being blown out grill above radiator) Bobcat on their M-series talked about how they got engine cooling fan correct compared to their competitors. At one point, Bobcat joking about recognizing one their competitors brand by a dust blown Rooster tail. Ironically, Bobcat ended up reversing air flow, without moving cooling fan to back door, which resulted in R-series doing a Rooster tail. Bobcat's backdoor intake fins point at ground, their competitor's point toward sky. To best I know, [I](being Bobcat would not converse with me[/I]), all large engine R-series (T86, T76, S86, S76) will suffer same dust and dirt cab infiltration problem. And there is no solution to dust and dirt problem, while front part of chassis has negative air pressure, resulting in cab having negative air pressure. ([I]I did verify chassis and cab air pressure was negative with engine cooling fan running[/I]). [/QUOTE]
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