Buy a good quality R-4. Flush entire system out(All components including hoses) Add correct amount and type of oil to each component(usually 10 ounces to whole system). Use a vacuum pump that boils water and pump as long as you can. On large systems i would go overnight. Add the correct...
I can't believe it but I bought a Dewalt battery operated one. I used it for the first time Saturday. I will give it an A grade so far. Biggest thing I cut was a 5" diameter water oak.
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