Re: Reply to 2500 or 574 help

Posted by Janicholson on June 16, 2007 at 07:06:07 from (66.173.50.174):

In Reply to: Reply to 2500 or 574 help posted by chadd on June 15, 2007 at 23:10:05:

The answer to hydraulic heating may be a combination of two things, In an open center system the return to resivoir valves/lines must be open causing zero pressure on the pump when all valves are in neutral, or float. If this is not the case it needs to be. A oil cooler with a fan if possible in the return line is also desirable. It needs to flow the 17 GPM of the pump.
The carb may need to be cleaned, If it is varnished up some the main jet can restrict flow. The float level is another possible lean causing issue if it is a bit low in the bowl. Measure carefully. The third is that if it still needs choke, the main jet may need to be replaced, or drilled out. (drilling is not the best solution as it is hit or miss, and the drill sizes are in number drills, not fractional, and tiny increments are all that is needed. Do not drill anything unless you have a second main jet to take it back to where it was. A CO HC meter hooked to the exhaust can assist in setting the fuel/air ratio. If it needs choke, it needs adjustment and will suffer low power and heating till fixed. JimN

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