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Hey there,

So I recently inherited an old scat tiger cub it’s in great shape and runs good (well it did). I did some repairs all of which went well except that there was a leak on on the heads of both hydro pumps for the rear wheels (the pumps above the mower deck not the ones in the wheels). I changed the gaskets and reassembled everything correctly per the service manual changed the hydro filter and added new oil. The problem is there is no power to the rear drive wheels now and I can’t get the air out of the system. I’ve tried the bleed procedure that’s in the manual that states to open both bypass valves and run the mower and move the arms forward and back about 6 times but when I close the bypass valves the rear wheels still have now power. They move just a little bit for a few seconds and then stop. Bottom line how do I get the air out of the hydro system?

Thank you.

Did you remove the charge pump covers (look like metal football shaped covers with 2 bolts)when you did the repair. if you did there is a chance that you turned the covers 180 degrees, which basically caused the pumps to reverse the flow. If they are reversed it will not purge the air from the system.

Also make sure you didn't lose the charge relief spring when you remove the charge pump cover. Easily overlooked.

ILENGINE said:

Did you remove the charge pump covers (look like metal football shaped covers with 2 bolts)when you did the repair. if you did there is a chance that you turned the covers 180 degrees, which basically caused the pumps to reverse the flow. If they are reversed it will not purge the air from the system.

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I did remove them and I matched them to the print they left on the heads so they were in the same orientation. (I know not science but I will check and probably try and reverse it to see if that helps.