What happened?

[hummod 0]

I wanted to mow with my 1992 520H and something broke. I was driving

it about a bolck to get to the back side of the lawn when all of a sudden the

rear wheels locked up. I can move it one wheel rotation each direction

then it acts like the hydro pump hits an immovable object and starts whining

loudly. The lift still works. I had to balance the rear end on a floor jack

for the return trip to the garage. What happened?

Larry

[rickv1957 72]

Possible broken end cap bolt?,Rick

[hummod 0]

I am starting to take the 520H apart to find out what happened. Most

of the parts are off and I am ready to pull the hydro pump. I will need

to pressure wash the transaxle first to try to keep dirt from getting inside.

I need to get another 100 ft of garden hose to reach the tractor. The tractor

cannot move and there is a 2 ft ditch where the road was now due to a paving

progect.

Rick, The wheels turn fine with the rear off the ground in opposite directions. The

problem is there when both wheels turn in the same direction. I would think a loose/broken end cap bolt would prevent a complete rotation even in opposite

directions. Thanks for the advice. I guess I will know more as I get further along.

This is a good example of why we all need more than one Wheel Horse.

Larry

[hummod 0]

Problem found. That Rick sure knows his Wheel Horses. As my

only responce to my post he was right on the money too. The

end cap bolts on the rear axle had come loose. One was already out,

one was half out and binding the transmission, and the other two were

only finger tight. Now comes the fun part of repair. I have a low hour

518-H rear that with a swap of the hydro pump and a few other parts

should work. Numbers cast on the side of the transaxle match.

Larry

[Horse'n Around 22]

The word OUCH comes to mind I dont know anything about that system but I hope that it isnt too much trouble to repair.

John

[Save Old Iron 1,566]

You may want to double check to see if those bolts are Grade 8.

Usually you don't see them bend that much before they snap.

Nuts on the bolts are supposed to be hi strength also.

:D

[rickv1957 72]

That same problem is common with the Ds,dont see it much with the smaller tractors, Rick

[Raider12 13]

I have seen these differentials on Ebay resently going for little to no money at all. $25? Might be worth looking into.

[refracman 167]

Haven't seen that happen to often since the D's. Before you start tearing apart the 518 make sure the pump drive gears are the same. They did change them.

Might be easier to get new bolts from the dealer also.

[hummod 0]

I checked the pump output gear and the 1989 518-H and the 1992 520-H use the

same 20 tooth gear. I did get a chance to put it back together tonight. It seems

to work just fine now. All I had to buy was a 3 dollar pump gasket plus a new

filter and some oil. I finally found a use for the 518-H tranxaxle that I have been

moving around the garage for the last two years. Thanks to everyone for the replies and advice.

[rickv1957 72]

Glad to hear your up and running Rick