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The Problem
Under operation transmission coolers build up a residue of contaminants over a long period of time. Most coolers are made of brass with brass webbing in the middle to dissipate heat. Transmission failure generates unusually high temperatures. When the cooler is in this expanded condition the larger contaminants are trapped. When the transmission cooler contracts as it cools down these contaminants are wedged between the webbing and the outer walls. To release these contaminants heat is needed to re-expand the cooler.
The Solution
All Hot Flush units are designed to simulate load conditions by heating the transmission cooler up to operating temperatures and higher while flushing occurs. The introduction of bursts of air and reversal of the oil and air flow makes the unit's ability to remove contaminants excellent. These contaminants are trapped in a 28 micron screen that is easily cleaned. The cooler can be considered clean when examination of the screen reveals no more trapped residue.
When the upper limit temperature is set between 160 to 190 degrees Fahrenheit, the heater cycles and the oil cools to between 120 to 140 degrees. This heating and cooling expands and contracts the cooler like a vehicle would during normal operation. This cycling and the resultant expansion and contraction crushes trapped contaminants for thorough removal.
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