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Setting new AR Gymatic unloader valve
Setting new AR Gymatic unloader valve
Good morning. Had to replace a pump on pressure washer. engine is Honda GX340. old pump was an AR 4G 3200psi. They don't make a 3200psi anymore so i went with a AR 4G 3700psi. Couple of questions please. The Gymatic unloader has to be set. My understanding is that you set it up so when the unloader is set to max (so that it is the highest that it will go without further adjustment) you can always turn it down when needed. My question is with a pump that on paper can do 4G 3700psi will that engine handle that without undo stress on it? Or do I set it at max of 3200psi? Somewhere in between? Just as an example if I settle on 3400psi and continue to use the 4.5 tips. I installed pressure gauge at outlet on pump before hose. Is this correct method to adjust?
1. bring locking nut up all the way to top of bolt
2. tighten unloader valve all of the down with knob
3. start pump and open trigger.
4. adjust bolt down until you reach the desired pressure (which would always be max) which in this case would be 3400psi.
5. release trigger and check for spike in pressure.
6. pressure spike should be no more than 400psi max
If it is more than 400psi does that mean that I need to lower max with trigger pulled to something less than 3400psi? Once I get it set to be no more than 400psi and put everything back together does that 400psi spike remain constant no matter if i turn the pressure down with the adjustment knob?
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