I had to replace the pump on my 3205 with the same engine and also the thermostat too. It's not too bad of a job. Look at your cam gear while you have it off for any problems and if it is plastic or steel. I got all my parts from TEW. Good luck and lets see some pictures.
http://tewarehouse.com/490442066
Don't forget about all the gaskets too.
http://tewarehouse.com/110602451
http://tewarehouse.com/110602450
Do a "parts look up" because these were from a 3000 series machine and yours is a SGT but they should be the same.