How to Adjust a Pressure Cleaner Pump Downloader

Pressure cleaner pumps are equipped with an adjustable valve known as a downloader, or an unloader on some models. The valve can be tightened or loosened to meet different pressure requirements. Virtually all pressure washing and cleaning equipment will list the maximum pressure ratings on the unit, as well as in the instruction manual. Don't adjust the pump downloader until you've identified the maximum setting. Always confirm that your adjustments do not exceed the maximum setting before using the pressure cleaner.

Garden hose
Pressure gauge
Wrench set

Instructions

- 1
  Set up the pressure cleaner for normal operation and connect the pressure gauge to the mount for the trigger wand on the cleaner. The gauge connects in the same way as the trigger wand.
- 2
  Connect the trigger wand to the other end of the pressure gauge.
- 3
  Turn on the pressure cleaner normally and wait for the motor to reach idle speed.
- 4
  Unscrew and remove the nylon cap from the top of the downloader valve. This is an L-shaped component typically mounted on the top or side of the pressure cleaner. The adjustment knob is underneath the nylon cap.
- 5
  Point the trigger wand in a safe direction and press the trigger lever. Note the pressure reading on the gauge.
- 6
  Twist the adjusting knob on the downloader clockwise while observing the pressure gauge. The pressure should not be set higher than 90 percent of the pressure cleaner's maximum rating. This is because the pressure will peak briefly when the trigger is released. Over time, these pressure bursts can wear down and damage the pump. For example, if the equipment is rated for a maximum pressure of 4,000 psi (pounds per square inch), then the downloader should not be set higher than 3,600 psi.

How to Change a Bearing on a Front-Loading Dryer

How to Fix a Frigidaire Microwave Door Switch

Appliance Repair