I have a Clark C300/40 forklift. The fork lift serial number is 356-37-4370. The transmission pan gasket leaked. After replacing gasket. The truck does not go forward or reverse. Prior to fluid change transmission worked good.

I drained fluid (axle and pan), changed gaskets on the transmission pan, re-installed pan and replaced filter. After doing this I had to start engine to raise mask so I could access trans filler/dipstick location to add fluid. I ran engine maybe 10-15 sec. then shut off. Added fluid and now the truck doesn't move forward or reverse. I think the pump sucked air and is air locked. Is this possible? If so, how do I purge air so pump makes forward/reverse operational.

Also, when I drained fluid only 4-6 qts was removed, I assume the rest of the fluid is in converter and lines (system is 15qt total). When I added fluid it only took 3qts, 1-3 qts less than what came out.

Thanks,
Rick 847-502-2399