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I have an M149A2 water buffalo, ex-uSMC, that is in excellent condition, but I am having difficulty with the manifold valve. This is a push - pull valve. Pushed all the way in and the water is cut off from the faucet boxes. Pulled out and the water flows through the pipes to the faucet boxes. Pulled out further and the water runs out of the four drain holes. My problem is that the push-pull handle is very difficult to move in and out. Turning the handle helps. Also, when pushed all the way in, the water is not cut off from the faucet boxes, but when pulled partially out, the water is 3/4 shut off when it should be wide open. When pulled out as far as possible, the o-ring is visible through the four drain holes and it looks to be in excellent shape. I need to take valve apart to service it. My question is has anyone done this before? Is it advisable to remove the entire manifold valve from the tank first? It looks like this is not necessary. I have TM 9-2330-267-14&P and this is not covered.
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