Overfull chain case

Miller05 · Sep 4, 2018

So I have a 2009 s300 bobcat. I pulled the plug for chain case and it was overfull. My question is what should be my next step? Do I pull both motors and take them in to get checked, or can I get seal kits for them?

reaperman · Sep 4, 2018

Don't get ahead of yourself. Are you sure its over full due to hydraulic fluid? Is your hydro fluid low in the hydro tank? If your adding hydro fluid and its disappearing then yes, its probably collecting in the chain case if there are no visible leaks. Otherwise, its not uncommon for moisture to collect inside the chain case over time. And even rain can seep in from around the chain case cover if the machine is left outside. Normally the carrier seal goes out and the hydro fluid is introduced to the chain case that way.

Miller05 · Sep 5, 2018

reaperman said:
Don't get ahead of yourself. Are you sure its over full due to hydraulic fluid? Is your hydro fluid low in the hydro tank? If your adding hydro fluid and its disappearing then yes, its probably collecting in the chain case if there are no visible leaks. Otherwise, its not uncommon for moisture to collect inside the chain case over time. And even rain can seep in from around the chain case cover if the machine is left outside. Normally the carrier seal goes out and the hydro fluid is introduced to the chain case that way.

That's what I was wondering. The level in hydro tank always is low but it seems I add a gallon and it's good. I pulled plug to chain case about 100 hrs ago and it was way over full, and I drained it down to level. When I pulled the plug the other day I drained a couple gallons from chain case.

Tazza · Sep 5, 2018

Miller05 said:
That's what I was wondering. The level in hydro tank always is low but it seems I add a gallon and it's good. I pulled plug to chain case about 100 hrs ago and it was way over full, and I drained it down to level. When I pulled the plug the other day I drained a couple gallons from chain case.

The motors don't have seals to prevent the oil getting into the chain case, the seal is in the carrier that the motor bolts to. With the motor off, you will see a seal around the shaft that the drive motor shaft goes into.
Another cause can be plugged case drain filters, the plug up and can cause fluid to enter the chain case.

Miller05 · Sep 5, 2018

Tazza said:
The motors don't have seals to prevent the oil getting into the chain case, the seal is in the carrier that the motor bolts to. With the motor off, you will see a seal around the shaft that the drive motor shaft goes into.
Another cause can be plugged case drain filters, the plug up and can cause fluid to enter the chain case.

Thanks for the tips guys. I'll check case drain and probly pick up some seals