Repairs hydro problem?

Hello all ,
I have a 2004 tiger cub , when mowing up an incline the left handle pulses or pushes back
repeatedly and the mower wanders to the left . I just had the unit serviced 2 weeks ago.
whats up?

Thanks , Ole Red

Hey Ol Red, did anyone ever respond to your problem? I'm experienceing the exact symptoms as you and would like to make certain of what is going on before I either pull the hydro pump myself or heaven forbid let the dealer loose on it. I'm wondering if the idler spring is simply gotten loose or worn? Not likely but..... Hope you are still on the forum, but if anyone else has any input please jump in! Thanks Russ.