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
O-ring is worn or damaged
Under the cap
Tank cap not lubricated/ tight
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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