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?

here is a step by step guide
Adjusting unloader valve on pressure washer must be one very carefully because it is a crucial responsibility. To make sure you change the valve correctly and preserve your pressure washer’s peak performance, carefully follow these instructions:

Step 1: Get the pressure washer ready.
It’s critical to follow the required safety measures before trying any adjustments:

a. Switch the pressure washer off. To prevent unintentional startup, turn off the pressure washer and unhook it from the power supply.

b. Lower the pressure: Release any accumulated pressure in the system by pulling back on the spray gun’s trigger. The safety and simplicity of adjustment depend on this action.

Step 2: Locate the Unloader Valve
The unloader valve’s precise placement can be determined by consulting the user handbook for your pressure washer. It is usually located next to the pump outlet and attached to the pressure hose. The unloader valve may contain an adjustment knob or screw for pressure regulation.

Step 3: Access the Adjustment Knob or Screw
Others could require removing a protective lid to access the adjustment screw. Some pressure washers have an exterior adjustment knob. If a cap covers the adjustment screw, carefully remove it using the proper tool.

Step 4: Adjust the Pressure
To adjust the pressure, perform the following procedures with a flat-head screwdriver or the device suggested in your pressure washer’s manual:

a. Clockwise: Rotate the adjustment screw or knob in a clockwise direction to increase pressure. To prevent overtightening, be sure to spin it slowly.

b. Counterclockwise: Rotate the adjustment screw or knob in a counterclockwise direction to lessen pressure. Again, take care to prevent any damage by doing this.

Step 5: Test the Pressure
After making the first adjustment, it’s time to check the pressure:

a. Turn on the pressure washer by plugging it in and turning it on.

b. Use the spray gun: Pull the trigger to start the water flowing from the spray gun. Keep an eye on the pressure while operating.

Step 6: Fine-tune the adjustment
You might need to fine-tune the adjustment in light of the results of the pressure test:

a. Increasing Pressure: If the pressure is still too low, move the adjustment knob or screw a bit counterclockwise to increase the pressure gradually.

b. Lowering Pressure: If the pressure is too high, lower it gradually by turning the adjustment screw or knob slightly counterclockwise.

Step 7: Lock the Setting
To stop unwanted changes, you must secure the adjustment once you’ve reached the desired pressure level:

Some pressure washers have an exterior locking mechanism.

a. exterior Adjustment Knob. Use the lock to secure the knob if yours has one.

b. Internal Adjustment Screw: If you change the pressure using an internal screw, you might need a thread-locking adhesive to keep the adjustment in place. By doing this, you can stop vibrations from the operation from causing the screw to loosen.

Step 8: Reassemble (If Applicable)
After making the adjustment and locking the setting, if you had to remove a protective cap to get to the adjustment screw, firmly reattach it.

Step 9: Test Final Adjustment
Restart the pressure washer and use the spray cannon to ensure the pressure stays where you want it.

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