I'm the guy who recently had his Cat pump throw a rod...
After doing some math, it seems the pump was running at 1815 rpm, while it is designed to run at 1415 rpm. No doubt this contributed to its' demise.
Perhaps the problem arose due to the rail height on the pump, which puts the center of the crankshaft at 5 inches off the deck. My math tells me the correct pulley size (based on a 4.5 inch motor pulley) is 11.5 inches more or less, considerably larger then the 8.75 inch pulley that was on it. And too big to fit in the space allotted. My engine (18HP Vangard) runs at 3600 rpm, which is probably pretty common.
I looked at going to an AR pump which runs at 1750 rpm, so that a smaller (9.25 inch) pulley could be used, but now that I have a "spare" pump, I'm thinking I'll stay with Cat. But, I will need to raise the mounting height at least one inch, easy enough with steel tubing.
I guess I'm just looking for some feedback on other's experience with pulley sizes and mounting problems, and to verify I did my math right...
After doing some math, it seems the pump was running at 1815 rpm, while it is designed to run at 1415 rpm. No doubt this contributed to its' demise.
Perhaps the problem arose due to the rail height on the pump, which puts the center of the crankshaft at 5 inches off the deck. My math tells me the correct pulley size (based on a 4.5 inch motor pulley) is 11.5 inches more or less, considerably larger then the 8.75 inch pulley that was on it. And too big to fit in the space allotted. My engine (18HP Vangard) runs at 3600 rpm, which is probably pretty common.
I looked at going to an AR pump which runs at 1750 rpm, so that a smaller (9.25 inch) pulley could be used, but now that I have a "spare" pump, I'm thinking I'll stay with Cat. But, I will need to raise the mounting height at least one inch, easy enough with steel tubing.
I guess I'm just looking for some feedback on other's experience with pulley sizes and mounting problems, and to verify I did my math right...
