This is on a Hustler 260K it has a Sunstrand pump. I bought this machine used and not running, has approx 1100 hours on it. The control lever on the right side seems to be binding compared the the left lever. When I first engage the pump clutch the engine bogs down and almost stalls out for a few seconds then speeds up and everything seems to work good. I notice if I first back off the screw that you loosen on the pump to allow the machine to be easily pushed, the control lever moves easily and the engine does not bog down when engaging the clutch. I can tighten up this screw with the clutch engaged, engine running and all seems fine after that till the next time I start the engine.