Posted by RayP(MI) on March 02, 2008 at 13:20:33 from (216.46.211.210):
Thanks for those who helped me locate information on my Monarch hydraulic pump. We located manufacturer's infro, and it is a M-683. Designed for snow plow use, and that was what I was using it on. Developed a leak on a port on the side that looked like a threaded rod with two jam nuts on it.
Took the risk of taking it apart without a service manual, which I would have dearly have loved to have had. Turns out the port is indeed a pressure relief valve. The bottom nut is the valve body which holds the spring that holds the ball valve shut. The threaded rod is a 3/8" x 1" coarse thread setscrew. (Think of a common setscrew like you would find on a v-belt pulley, only longer.) The top jamnut is actually a nut with a plastic insert/washer which forms a seal at the top of the valve body. That setscrew, which had a hex shaped hole recessed in the top had snapped off right at the junction of the valve body and the jamnut - this allowed fluid to escape past the threads, go through the crack, and leak into the recessed hex hole in the setscrew. Craziest thing I have seen in a long time!
On a Sunday, only parts place I could go was the local Ace hardware. Bought a 3/8" x 1" square head setscrew and used that. Think I got a good repair!
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
... [Read Article]
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