Posted by jfharper on November 30, 2012 at 20:49:47 from (173.255.107.30):
The key on my front mount hydraulic pump (3/4" shaft) sheared off and I think it was because the key seat on the mechanical element (drive shaft) has a larger height. The key was a square key, 3/16" x 3/16" x 7/8" (WxHxL). I think the key seat on the drive shaft allowed the key to work itself out until the key sheared off. The shaft on the pump shows a couple chips where the key seat set into...hopefully it is OK.
I was thinking of just getting some key stock that was rectangular, like 1/2" x 3/16", cutting the length I need and then grinding down the height so the key cannot work itself out of the pump shaft key seat.
Question is, should I go with carbon steel or stainless? I want to go hard enough on the steel to handle the torque, but also allow for shearing to avoid damaging the pump shaft if it comes to it. Anyone know or have a recommendation?
My pump is a 1.95 cu in displacement pump, 2300 PSI peak and I have a pressure relief on my valve set to 2150 psi. My tractor is a massey 205 industrial...I have no backhoe, just a 200 davis front loader and 3 pt rear implement with rams for tilting and such. TIA
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