Allyn,
It would appear that you are missing the sleeve (10A7223) and 2 copper gaskets (10A9810) that go between the back of the bearing race in the tractor and the face of the hydraulic pump.Pumps are available with two diferent styles of front shaft, which use different drive shafts and couplers. One style of pump shaft is round with a key. This style originally was used with a drive shaft that was also round and keyed. It uses an adapter on both the pump shaft and the drive shaft, with a splined coupler between the adapters that has a spline that looks like an 1-3/8" 6 spline PTO shaft. The other style used a splined end on both the pump shaft and the drive shaft. These splines are about 7/8" 6 spline & use a coupler that goes directly between the pump shaft and the drive shaft. If by chance the styles of your pump and drive shaft are not the same, MM did make an adapter that was used on some of the other tractors that can be used on the 7/8" 6 spline to match it to the 1-3/8" 6 spline that can be used on either shaft. The measurements that I mention (7/8 & 1-3/8) are approximate from memory. The 335 used several diferent regular pumps that were rated from 4.5 thru 17.5 GPM depending on type of hydraulic equipment and serial number. As for the power steering or lack of it. The pump for use with power steering has a priority valve that is close to the tractor on the top right side. To use it without power steering, remove the priority valve and spring & put the plug back in. You must also plug the hole on the top right rear of the pump. A special pug is available to plug that hole. The thread is 5/8"-18. I have seen two different type used. One uses a copper washer to seal between the housing and the plug. The other seals on the fitting in the bottom of the hole that the tube on the hose assembly would normally seal on if the unit had power steering. Hope this helps John
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