fluid level full, A lot of resistance on the levers when going forward or back, sluggish movement, slow raising and tipping of the bucket. requires excessive foot pressure and arm strength needed to work the controls in order to get halfway decent movement. throttling up still doesn't give much better responsiveness.
I have a couple of 843s. Sounds like your auxillary hydraulic lever is in the on position. Be sure the righthand lever is in the neutral or middle postition. I don't think if it were on it would affect the foward and back movement. If my aux. hyd. lever is left on my engine is hard to start and it does affect the lift and tilt functions.