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300U hydraulic problems

Peter When we bought the 300U, the rear lift had no down pressure, even though it has a 2-way ram. It didn't matter which way the valve was turned (valve is near the lift control lever under seat, right side). Due to leaks and low pressure, pump was replaced and 2-way ram rebuilt last fall. We didn't expect that to solve the problem and it didn't.

Plowing snow this winter, the scrapper blade began to have down pressure (practically lifts the rear end).

Now I can't get turn off down pressure--doesn't matter which way the valve is turned, both ways supply down pressure. Any ideas? Thanks.

P Answering my own question (for anyone watching):

I forgot that there is a place in the lift mechanism where a 3/4 inch pin can be inserted or removed. We had inserted the pin and forget about it. REmoving the pin allows the lift to operated in such a way that it has no down pressure. --Peter

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