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Old 10-25-2012, 10:09 AM
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bobcat_ron bobcat_ron is offline
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Join Date: Nov 2007
Location: Abbotsford, British Columbia
Posts: 10,121
The pump vibrates because there is an imbalance on the mulcher head, that transmits through the oil pressure. My brother's 48" disc mower would vibrate everything on the 320CL at full speed with no load, and that disc was severely out of balance from either missing teeth or teeth that were only down to half a tooth.
You might also want to think about getting a case drain line with a small 10lb check valve inline drilled and threaded into the motor to take any excess back pressure away, that might help with the vibrations as well.
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