How often to change oil in Rotary cutter?

[thedevilyoulove]

I have a land pride RCF2072 that I purchased new last May. I've had it about a year now. Should I change the oil in the gear box? The manual says to use EP 85-90w but doesn't say how often to change it. Also, I don't see a drain plug anywhere on the gear box. Do you all change your gear box oil in your rotary cutters?

 

[WFM]

I have a LandPride RCR1860 bush hog.....its three yrs old now. And I haven't changed to oil yet. My owners manual says 80-90W EP gear oil. But as with yours gives no recommended time when to change. Just add if its low.

 

[Diydave]

I have several bush hogs, of varying age and manufacture... I've never changed the oil, unless a bad seal did it for me. Unless it were burnt smelling, I'd keep it full, and lever B...