Commando 800 Transmission fluid

[MCRuck 0]

New to forum.  Restoring my father's Commando 800.  Has mower deck and front blade.  Trans is 3 speed. Running smooth, have changed all fluids except transmission.  Have not found Dad's manual yet, so at a loss as to what fluid it takes. Also interested in any good ideas on how to flush trans.  OK to use diesel or ATF for flushing agent.  I'm sure it's been years since trans fluid was changed. Appreciate any help. Glad I found this site!!

[Achto 27,777]

27 minutes ago, MCRuck said:

Also interested in any good ideas on how to flush trans

 

  Diesel fuel works good for flushing the tranny. Drain the old oil out of the tranny. Note: there is a hump inside the tranny that will not allow all of the oil to drain out. Jack the front of the tractor up to allow the oil to get over the hump. Fill the tranny with diesel and drive the tractor around for about 5min or so. Drain the diesel out using the same method to get it over the hump. Refill with 80w 90 gear lube.

[3QTR40 6]

They actually take 140 weight gear oil. This is straight from the transmission manual. I found 140w at my local carquest.

 

[ebinmaine 68,387]

7 hours ago, MCRuck said:

New to forum

Welcome to Redsquare!!!

 

@Achto Dan gave great instructions above.

Be sure to throw a new shift boot on if you haven't already done so.

 

And pictures...we looove pictures...

 

 

 

6 hours ago, 3QTR40 said:

They actually take 140 weight gear oil

Welcome to you as well !!

 

Straight 140 can be tough to get here in Maine.

We run 80w 90 in our fleet. The viscosity is of lesser concern than being sure to change the oil at proper intervals.

 

[oliver2-44 9,870]

If your going to be using it with the blade for winter snow duty the 80/90w gear oil will give good winter and summer lubrication.  In cold winter areas the 140w can take a while to warm up and might make it a little hard to shift until it does.

[3QTR40 6]

It gets pretty cold here in Montana too! Oddly enough it’s harder to find Wheel Horses than it is to find 140w around here! A lot of auto parts stores out here carry a wide variety of farm/implement type products as well.

[stevasaurus 22,868]

Not to get into a big thing about the viscosity of oil to use in the transmissions, but I just want to point something out.  @3QTR40 is using the transmission manual to point out the 140 wt oil suggested in the Section III (4 speeds) section.  If you look at the Section II (3 speeds) section, it states using 90 wt.  All of you guys are correct, and temperature might play a role in what is selected.

 

I just want to point out the only difference between the 3 speed and 4 speed transmissions is what shaft the brake drum is mounted on.  All of the internal gears are the same except that the mushroom gear shaft is shorter and the cluster gear shaft is longer in the 4 speed. 

 

 

 

 

So, we are all correct.