Flushing gear box with "machine oil"

[Gale Hawkins]

Diesel is a good option in most cases but I find the old 303 UTF for around $20 for 5 gallons on sale which cost wise is not that much more. Under no load I will actually run the gear box a bit then drain. If some gets trapped and does not drain completely it is still lube oil and not diesel. A lot of old gear boxes do not have a low point drain on our stuff so I have to suck it have to suck it back out or turn it upside down.

How ever often I will do the diesel flush before the 303 flush. If the fill plug is large enough I like to use the diesel in a hand pump pressure sprayer on solid steam for flushing action. I know shops just kind of drain and refill often.

 

[def38]

My 231 had sludge in the gearcase. Drained the oil and ran some diesel in the gearcase while driving around the ranch with no load. Drained the diesel and filled with fresh oil and a new filter. The hydraulics now operate much better and faster and the dipstick shows clean, clear oil. No leaks.