Cooling Fan Gearbox

[MyPrevost]

I started considering the gearbox that powers the cooling fan and noticed there was no way to check the oil level or drain it. I called Prevost, and they mentioned they made a dipstick from a piece of wire, so I created one and found the oil level was half full.

Thinking it might be a good idea to drain and replace the oil, I looked for a drain plug but couldn’t find one. It seems they installed the gearbox on a riser without any drainage option, which probably means it hadn’t been serviced since installation. I ended up using a suction method to remove the oil.

While working on that, I thought about removing the riser, cutting a hole in it, and adding an extension tube for a proper drain. This modification should make servicing the gearbox much easier.

If you’re using a 200 series gearbox made by Superior, you might want to consider making this change!

[MyPrevost]

Great post, Dale! I recently went through the same process and found the maintenance manual quite confusing, with arrows pointing to non-existent fill and drain plugs—likely for the older Boston gearbox. Your modification makes a lot of sense. Were you able to leave the gearbox hanging on the shafts to avoid disturbing the alignment?

[MyPrevost]

Were you able to leave the gearbox hanging on the shafts in order to not disturb the alignment?

Brian, Everything is back to original except I have hole in the mounting plate and a drain tube.

[MyPrevost]

Nice Job, Dale. Am I correct that we use 90wt. gear oil in the box?

[MyPrevost]

If you have a Superior gearbox with 4.5″ bolt centers and a height of 4 inches, then you’ve got a gearbox made by Superior. It holds 14 ounces of Mobil SHC-630, with Prevost part # 180217.

[Author]

Posts