i just purchased a bobcat 630 gas machine. the problem was is the left side wouldnt drive so i then took the seat and cover plates of and noticed the brake disk was of and that the sheer pin had sheered and the gear was spinning on the shaft. i got a new gear shear pin and brake disk along with the nut and washer. put it all back together added the fluid, put new hydrolic fluid in and changed the filter, changed the oil, change the plug wires and distributer, cleaned air filter, and put new spark plugs in it. i got it all together and when i tried to test it out the left side steers and works fine with power, and the right side seems to have not as mutch power as the left. i belive from using it that the right side drive pump isnt working correctly? and how mutch does it cost to rebuild or have it rebuilt? and any ideas on what the machine is worth, any help would be greatly appreciated.