My father gave me his Husqvarna 7021r. It's a 9 year old self propelled lawn mower. I am in the process of pretty much making everything new on it. Honestly I have like $200+ in it and it's a fun project. New wheels, pulleys, springs, blade, bearings...etc. All the easy fun stuff that was never changed because he never knew to change that stuff.
I took off the rear tiny transmission. It appears to be a plastic/metal type housing held together by 9 screws and a seal in the middle. I was able to break apart the transmission halves and inside there is grease that is very black/dark. Smells almost like rear diff fluid to me. Not NEARLY as runny. I know this is probably a "lifetime" type of grease as they way the seal was in the middle they probably don't intend for the end user to break it apart.
My first question is what is the best way to fully clean all the grease out? I would normally use brake clean however I know that stuff isn't good on plastic... so what would be best? Just a normal McGuire's degreaser or simple green and spray out with water?
Next would be what type of grease should be used? I have a ton of Timken red wheel bearing grease on hand, and Mobil 1 syn grease. That stuff seems a little too thick though. I read somewhere that someone recommended 00 grease, but I've never used or seen that so I don't know what the consistency is on it.
Should I replace with this:https://www.amazon.com/Stens-770-123-00-...words=00+grease
Seems like a good grease. Or should I just put the two halves back together and not do anything? Seems weird to not do it considering I've changed just about everything on the mower. A new transmission is $80 but this is completely fine. The axles have a little rust on the outside but internally the plastic gear and metal worm gear are 100% fine. I checked and see zero metal shavings or plastic gears stripped. The grease/oil is just super dark, and looks like to me personally it should be changed for new so that it lasts another 9 years for me...lol
Side Note: I found an old thread indicating that some of these smaller push mower transmissions use bentonite grease but when googling a picture of that stuff it almost appears that it is like peanut butter, and that definitely does not look like what is in this transmission. If I took a picture and posted it tomorrow of what the inside looks like with the grease would that help anyone on what specifically to use?