I600

Hey Just getting it all fired up for the spring. Its starts and runs real nice and seems to have lots of lifting power but when I try to go up any sort of hill even a sloped driveway it really struggles and come to a stop even with full throttle and shuttle lever pressed forward. On flat ground or very small slope drives great but front and backwards. Although when driving frontward (which is backwards for the tractor) it does have a pretty go winding sound that you dont get when you drive backwards( or front wards for the tractor) any thoughts

That would be very helpful. I was driving in first so it must be something with the shuttle shift and your suggestion would seem to make sense because it seems to lift a load with no problem which leads me to rule out any pump issue. If you had to take a few pdf's that would be great . 

I will have a better look at everything once this week of rain stops. I did get a chance to pull the cover off and have a look at the clutch, and boy was the oil bad. Surprised it even drove at all, It looked exactly like chocolate milk. I have new fluid for it, any ideas on the best way to flush the system? i have never done it before. I picked the machine up right before the winter and haven't done much to it yet. My I600 is also the fork lift model, are the two reservoirs separate, because i figure I should change the fluid in that as well.