Our church has a Ramsomes XM3654 walk behind that has ran excellant the last few years. I noticed though the last few times I mowed with it that it just isn't handling the hills like it use to. I don't think any belts are slipping though I couldn't actually see the drive belt on the tranny. When I take a big hill it just seems to peter out like I am in a high gear even though I am in low gear. Any insight is much appreciated!