LT-155 mower won't back up
I'm working on my neighbor's LT-155. He owns a high-end horse arena and training farm. The mower is used to cut down pasture and gets worked pretty hard. The mow deck is cranked up to just below where it locks in the up position.
I also own an LT-155, but it's hard to use it as a baseline when I'm not sure what to look for. Need help from the collective to diagnose the issue.
When I try to back up with WOT it makes a 'weird' noise and won't back up a slight incline. It barely moves backward on level ground, but has fairly good go in forward. I've got the mow deck off and don't know how to check the belt tautness or tensioner function when it's not moving.
The belt doesn't appear really worn. It's not glazed, but have no idea how to test if it's slipping.
The rear hydrostatic appears to have some weeping as it's stained on one side. Not sure where it's coming from, but appears to be from the top coming down.
The fan is in tact with no broken fins.
How do I isolate whether it's the belt or rear drive? Is there some test for either case?
80 JD-400: backhoe - Front loader - 54" blade - 42" rototiller
89 JD-318: 54" blade - 42" mow deck - 30" rototiller
99 LT-166: V-twin - 42" Freedom mulch deck
00 LT-155: 42" Freedom mulch deck (now a cart tug)