Dear RGMArtin: A few weeks back you were good enough to help me with an issue I was having with my 1975 Case/David Brown 990. Your simple advice solved my problem and my tractor is working well for me. One of my guys (who helps me cut, rake, bail and haul my hay) has a 1985 Case - International Model 1494. It is a four wheel drive tractor and he just bought it recently. His tractor (like mine) grinds when we try to engage the PTO with the engine running. Perhaps since they are different tractors there may be different reasons for why this is happening. If we shut the tractor(s) down all together, engage the PTO and then restart the tractor the PTO hold and functions just fine but it would of course be nice to engage the PTO while the tractor is running for obvious reasons. Would you by any chance happen to know what might cause this (on one or both of these tractors) or, if not, be able to direct us to where we may find some answers? Any info would be more than we have to work with at the moment. Many thanks for anything you can offer up and thanks again for your help earlier.