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Troubleshooting Backpack Low Pressure and Leaks

Troubleshooting Backpack Low Pressure and Leaks

Wear and tear are normal after using a backpack sprayer for a long time but that doesn't make it any less frustrating. Low pressure and leaks are two issues that can cause major headaches.  Many people can understand the frustration of discovering a leak or finding their backpack sprayer won’t hold pressure before a busy day.

If you find yourself in a similar situation, there is no need to buy a new sprayer. All you need to do is identify the source to figure out exactly what you need to repair or replace.  Once you repair or replace the right part, your backpack sprayer should continue to work as normal

Possible Causes of Pressure Loss




Damaged valve plates

Replace the valve plate

4061257 [requires 2]

Worn or damaged O-ring on the piston

Replace the O-ring


No lube on Viton® Collar

Lubricate Viton® collar with petroleum jelly or Vaseline piston


With pressure issues, a swollen valve plate is usually the culprit. The valve plates in backpack sprayers serve as a barrier to stop liquid from escaping, essentially creating a seal.   When it comes to pressure loss, you’ll need to find areas where air could escape.

Possible Causes for Leaks

The most common reason sprayers leak is a worn or damaged component, whether that be a valve or an O-ring. To fix a leaking sprayer, you need to locate the source of the leak.





Dripping at end of the spray wand

Worn or damaged O-ring

in the shut-off valve

Rebuild the shut-off valve


Hose connections

Loose clamp

O-ring is worn or damaged

Check clamp

Replace O-ring


Under the cap

Tank cap not lubricated/ tight

O-Ring damage

Lubricate lid gasket or O-ring

Replace O-Ring if damaged



Complete repair kits are available that include all O-rings and seals to rebuild units.

Piston type: 0610407-K

Diaphragm type: 06100406-K

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