640 with loader

[Varmint1]

What oil for the transmission on the 640, also what oil goes in an SOS trans

[kf4uda]

I use the Universal Tractor Fluid (UTF) in both the transmission and hydraulics. I think that most folks do the same. I have no knowledge about your SOS tranny.

[Varmint1]

Thanks for all the info, hope someone will chime in on the SOS oil

[Soundguy]

hyds holds about 2g of utf fluid.

I'd put utf in the trans and diffy for now too.

you will soon be replacing the filed points.. but for now they will be fine.

rings may be stuck from setting.

put a quart of atf into the oil, and a half quart in the gas. pul lthe plugs and put a couple tablespoons down each hole and let it set a day.. run the engine over with plugs out to slig the oil.. then start back up...

[Soundguy]

sos trannies most deffinately take a UTF oil..

[Varmint1]

Did a little cleaning on the 640

[Soundguy]

interesting rears.. what size are they?

check out the frotn axle.. i detect some bowing in the radius rods.

[Varmint1]

The rear tires are 13.00 x24 there are from my forklift, the tires that came with the 640 we put on the 8N, yes the front axle is about shot I'm gunna have to go get it bored and bushing back to std and get a new pin. As for the radius arm it is a little bowed but the right isn't the trunion balls have a lot of wear and slack

[Soundguy]

unless the balls slip out of the socket completely.. they are a non issue.

a chain and bottle jack can usually straightent he arm.

a metal slug, lead weight or penny can be put int he socket behind the ball.. so can a piece of inner tube.. works great..

[Varmint1]

Anybody have a halfa$s good hood for a 600 series. I have nothing so anything would be better than nothing