07-31-2016, 11:50 AM
There is a drain plug at the bottom of the differential. There is a fill plug on the front side of the differential about 3/4 up from the bottom. The differential should be filled to this fill plug. The 5 gallons filled the differential on mine right to the fill plug. I always check the oil in the differential by removing this plug and sticking my finger into the hole and if I can get a little oil on my finger it is full. It is usually about 1/8 to 1/4 inches below the hole when it is a room temperature or if you just drove in it might run out. There is a vent on the top of the axle that allows this expansion or it will blow a seal. When draining the oil and it flows freely without removing the fill plug you will know the vent is not plugged up.
I bought a 5 gallon bucket of the oil from a local oil Co. and used a drill pump to pump the oil into the differential. My wife was holding the hose into the bucket while I was under the coach with the drill and the other end of the hose was in the fill hole. Another way to do it is when I helped Rudy change his differential oil in his Foretravel was to buy qt. bottles from NAPA. Rudy was under his coach and I was opening the bottles and handing them to him. There was a lot of bottles.
Rudy"s did not hold 5 gallons. So to answer your question fill the differential until the oil starts to run out.
I bought a 5 gallon bucket of the oil from a local oil Co. and used a drill pump to pump the oil into the differential. My wife was holding the hose into the bucket while I was under the coach with the drill and the other end of the hose was in the fill hole. Another way to do it is when I helped Rudy change his differential oil in his Foretravel was to buy qt. bottles from NAPA. Rudy was under his coach and I was opening the bottles and handing them to him. There was a lot of bottles.
Rudy"s did not hold 5 gallons. So to answer your question fill the differential until the oil starts to run out.
Chappell and Mary
2004 Foretravel 36 foot