Posted by DoubleO7 on August 25, 2018 at 07:28:29 from (104.136.210.65):
In Reply to: Air cleaner question posted by David R Inman on August 25, 2018 at 06:57:15:
Here ya go, from Donaldson:
"When the engine is running, there will be a slight vacuum in the air cleaner. This vacuum will cause the vac valve to close, preventing air and dirt from entering. However, the engine will also have a pulsing effect on this vacuum, causing the vac valve to open and close slightly and rapidly, expelling the accumulated dust from inside the air cleaner. The vac valve will also expel dust when the engine is stopped, so the vac valve makes the pre-cleaning action of the air cleaner ‘self cleaning’."
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