Need to reset and adjust downloader.

you are referring to the walking foot tension
ask a sewing machine repair shop how to adjust it
could be a lock washer held in place by a set screw where you loosen off the screw and push it closer against the spring and re tension the screw

Cathy, there is a way to adjust belt tension on some models whether it is by the cable or a slotted bracket where the idler wheel is mounted, depends on make and model. If you have your manual check in it for belt adjustment. Could be stretched belt, stretched cable, worn/oil on pulley, seized tensioner, stretched/broken spring on tensioner,etc.
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It is adjustable. Remove the square cover nut and adjust the spring tension. . It would be best to lower to 110-115 psi. The compression rings will thank you for it..

Most likely the tension adjustment dial. Is this on the front of the machine head or on top above the pressure foot.

If it is close to the tension device then it will be the top thread tension adjustment dial, these are usually numbered from zero to 10. Normal setting 4-5.

If it is a knob directly above the pressure foot, then it will be the adjustment for how much pressure the presser foot applies to the fabric, some machines allow you to adjust this; if you are sewing very light fabric you might need to add a little pressure. Or very heavy coat weights you'd need to slacken it off a little.

The unloader/bypass valve is jamming or defective. When you are not pressing the button the water is directed through the unloader valve/check valve to recirculate.It is common for them to corrode or for the spring to break.If it has an adjustment screw on the unloading valve for unloading pressure make sure you count the turns before disassembling it to make sure you dont over pressurize it.It is not opening causing the engine to choke out.Please let me know if this helps

Is there pressure in the tank already? The reset is usually on the end of the motor.
The pressure switch, a diaphragm pushes against an adjustable tension spring. Less spring tension cuts the motor out at lower pressure, more tension at a higher pressure. Has this adjustment been used? It may have a second adjustment, either nut or screw, that adjusts the pressure differential between cut in and cut out.

There is no adjustment on the Craftsman mower belt tension. The tension is maintained by a spring. If the belt is to loose you either have the wrong belt or something is broken like a mandrel housing that holds the fixed pulleys in place.

The following link will give you great troubleshooting for all pressurewashers. http://www.pressurewasherservice.ca/serv02.htm

There are several way to increase pressure. Primary way is to turn the pressure regulator knob in the direction to increase tension on the spring. Pressure regulator is located on the pump (or very neer) and usually has a large spring. Sometimes the spring is hidden under a twist knob. If the adjuster seems to be already turned to max then you may need to just change the pressure tip. The tip/nozzle is actually where the pressure is created by restricting the flow of water thru a very small opening. Use a new tip of the same gpm flow that is required by your machine. 18 hp machine has potential for very high pressure and high gallons per minute. Use trouble shooting guide above for more information. Good luck

There is no tension adjustment it has an idler pulley working off from a spring. Check to make sure that the spring did not come off or break. If neither of these have happened then the belt is stretched and you need to purchase a new one.

On the Rio 2002, the tensionner is only used to apply pressure to the timing belt (installation) and cannot be adjusted. Once install the tensionner is "auto adjust" using a spring. If you need to adjust it,may be it time to change the timing belt KIT. Around 60,000 M.