1. Loose hose. One of the common causes is not having the hose installed properly. Remove the hose from the tank. Most sprayers have a hose barb (2 plastic, white tabs) located at the end of the hose under the hose nut. Reinsert the dip tube into the tank making sure to align the hose barb with the cut outs (see picture below). Push the tabs down into the notches until they cannot go any further. Then hand tighten the hose nut onto the tank - being careful not to cross thread or overtighten. (NEED TO INSERT VIDEO) If your sprayer does not have a hose barb, you can just reinsert the dip tube into the tank and hand tighten the hose nut as described previously.
2. Inspect the pump gasket. Depressurize the sprayer and remove the pump from the tank. The pump gasket is located at the top of the pump right above the threads (see picture below). Remove the dirt or debris from the gasket and pump threads by wiping with a clean cloth. Then lubricate gasket with a light oil (i.e., 3-IN-ONE® Multi-Purpose Oil) to keep gasket from drying out. Replace pump in tank and hand tighten until it is snug. Do not overtighten as it can cause damage to the gasket. NOTE: If you notice the gasket is chipped, torn, swollen or misshaped, it will need to be replaced by ordering a pump service kit.*
3. Inspect the pump check valve. With the pump removed, locate the check valve at the bottom of the pump. Make sure there is no dirt or debris underneath the check valve. It can be easily removed, washed and put back into place. If you notice it is damaged or worn, it will need to be replaced by ordering a pump service kit.*
4. Inspect pump piston o-ring. Again, have the pump removed from the tank. You will be separating the pump piston from the pump barrel. First pull the pump handle up until it cannot go any further. Then use a flat screwdriver to push the tabs in on both sides of the pump cylinder and pry up. At the end of the plastic piston/rod, there will be a black o-ring. Periodically this o-ring needs to be lubricated with a heavy coating of petroleum jelly to ensure a nice tight seal in the pump barrel - delivering as much air as possible per stroke. If you find this o-ring seal to be worn, damaged, or swollen, it will need to be replaced by ordering a pump service kit.*

Hose Barb

Pump Gasket

Check Valve

Piston O-Ring 1

Piston O-Ring 2

The shut-off lock might be engaged. Squeeze shut-off handle (red, yellow, or green), then slide it back towards the sprayer to disengage the lock. The handle should pop up to stop the spraying. If this does not fix the issue, the shut-off assembly might need to be replaced.*

Shutoff Lock

There may be dirt or debris stuck under the pump check valve. Remove the pump from the tank and locate the check valve at the bottom of the pump. It can be easily removed, washed and put back into place. If you notice it is damaged, worn, or misshaped, it will need to be replaced by ordering a pump service kit.*

Check Valve

1. Loose hose. One of the common causes is not having the hose installed properly. Remove the hose from the tank. Most sprayers have a hose barb (2 plastic, white tabs) located at the end of the hose under the hose nut. Reinsert the dip tube into the tank making sure to align the hose barb with the cut outs (see picture below). Push the tabs down into the notches until they cannot go any further. Then hand tighten the hose nut onto the tank - being careful not to cross thread or overtighten. (NEED TO INSERT VIDEO) If your sprayer does not have a hose barb, you can just reinsert the dip tube into the tank and hand tighten the hose nut as described previously.
2. Cracked, swollen or faulty hose. If the hose becomes cracked or swollen, it will need to be replaced by ordering a shut-off assembly.* Note: The hose cannot be removed from the shut-off.

Hose Barb

1. Too much liquid in the tank. The sprayer has raised fill markings on the side of the tank - only fill to the max fill line. This will allow enough room in the tank for the air/pressure needed to allow the sprayer to function properly.
2. Inspect pump piston o-ring. f you are having a hard time pumping the sprayer, you could have a damaged piston o-ring. Again, have the pump removed from the tank. You will be separating the pump piston from the pump barrel. First pull the pump handle up until it cannot go any further. Then use a flat screwdriver to push the tabs in on both sides of the pump cylinder and pry up. At the end of the plastic piston/rod, there will be a black o-ring. Periodically this o-ring needs to be lubricated with a heavy coating of petroleum jelly to ensure a nice tight seal in the pump barrel - delivering as much air as possible per stroke. If you find this o-ring seal to be worn, damaged, or swollen, it will need to be replaced by ordering a pump service kit.*

Piston O-Ring 1

Piston O-Ring 2

There may be dirt or debris in the shut-off valve, which is located inside the handle. Loosen and remove the black knob on the bottom of the shut-off. You might need a pliers to loosen it initially. Remove the spring and flush water through the opening to remove any blockage that might be present. If this does not fix the issue, the shut-off assembly will need to be replaced.*

Shutoff Valve

Shutoff Valve 2

1. Substance is too thick for the sprayer. These sprayers are not designed to spray liquids with thicker viscosities (i.e., paint, stains, some sealers, etc.). They are ideal for herbicides, insecticides, pesticides, fungicides, fertilizers, and other chemicals with the consistency of water (Caution: Never use flammable liquids, caustics, acids, or hot water in these sprayers.) Please contact our customer service if you have a question regarding a specific chemical.
2. Sprayer wand or nozzle is clogged. Remove the nozzle from the wand. Flush wand, shut-off and nozzle with clean, cold water. NOTE: The all-in-one nozzle cannot be taken apart. If clogged, the nozzle will need to be replaced.*
3. Dip tube filter clogged. If your sprayer is equipped with a filter at the end of the dip tube, it can be removed and cleaned. Simply loosen the hose nut and pull the dip tube out of the tank. Remove the filter and flush out with clean, cold water.
4. O-Ring is missing from the end of the wand. Remove the nozzle from the wand. Check to make sure there is an o-ring (color may vary) at the end of the wand. If it is missing and cannot be located, the o-ring can be replaced by ordering the Roundup® Parts Repair Kit.*

Dip Tube Filter

Dip Tube Filter Callout

Wand Tip O-Ring

1. Loose hose. Inspect the connection to ensure it is not cross threaded, and then hand tighten the hose nut.
2. Inspect the pump gasket. Depressurize the sprayer and remove the pump from the tank. The pump gasket is located at the top of the pump right above the threads (See Figure 2). Remove the dirt or debris from the gasket and pump threads by wiping with a clean cloth. Then lubricate gasket with a light oil (i.e., 3-IN-ONE® Multi-Purpose Oil) to keep gasket from drying out. Replace pump in tank and hand tighten until it is snug. Do not overtighten as it can cause damage to the gasket. NOTE: If you notice the gasket is chipped, torn, swollen or misshaped, it will need to be replaced by ordering a pump service kit.*
3. Inspect the pump check valve. With the pump removed, locate the check valve at the bottom of the pump (See Figure 3). Make sure there is no dirt or debris underneath the check valve. It can be easily removed, washed and put back into place. If you notice it is damaged or worn, it will need to be replaced by ordering a pump service kit.*
4. Inspect pump piston o-ring. After you have removed the pump from the tank, you will need to separate the pump piston from the pump barrel. Squeeze the tabs on the cap and pull away from the barrel (See Figure 4). At the end of the metal piston/rod, there will be an o-ring (See Figure 5). Periodically this o-ring needs to be lubricated with a heavy coating of petroleum jelly to ensure a nice tight seal in the pump barrel - delivering as much air as possible per stroke. If you find this o-ring seal to be worn, damaged, or swollen, it will need to be replaced by ordering a pump service kit.*

Figure 2

Figure 3

Figure 4

Figure 5

1. Shut-off lock is partially engaged. Squeeze shut-off lever all the way down and push the trigger lock towards the nozzle to unlock (See Figure 6).
2. Dirt or debris in the shut-off valve. The valve is located inside the handle, so the first step is to depressurize the sprayer and release all liquid from the wand. Then unscrew and remove the shut-off assembly from the black rubber grip and hose (See Figure 7). It will come apart right above the section that reads "FILTER". Remove the white filter inside the handle and flush with clean, cold water to remove any debris. Then flush cold water through the shut-off poppet (metal rod located within yellow nut). Press the shut-off lever (like you would as if you were spraying) for the poppet to open and allow the water to flow through. Lastly run cold water through the handle and hose.
3. Damaged o-ring or seal in shut-off. If the steps above haven't solved the issue, the o-rings or seals could be damaged and need to be replaced by ordering the shut-off service kit. *

Figure 6

Figure 7

Inspect the pump check valve. Depressurize the sprayer and remove pump from the tank. Locate the check valve at the bottom of the pump (See Figure 3). Make sure there is no dirt or debris underneath the check valve. It can be easily removed, washed and put back into place. If you notice it is damaged or worn, it will need to be replaced by ordering a pump service kit.

Figure 3

1. Loose hose. Inspect the connection to ensure it is not cross threaded, and then hand tighten the hose nut.
2. Cracked, swollen or faulty hose. If the hose becomes cracked or swollen, it will need to be replaced by ordering a shut-off assembly *Note: The hose cannot be removed from the shut-off, so it will also need to be replaced.

1. Too much liquid in the tank. The sprayer has raised fill markings on the side of the tank - only fill to the max fill line. This will allow enough room in the tank for the air/pressure needed to allow the sprayer to function properly.
2. Inspect pump piston o-ring. Depressurize the sprayer and remove the pump from the tank. You will need to separate the pump piston from the pump barrel. Squeeze the two tabs on the cap and pull away from the barrel (See Figure 4). At the end of the metal piston/rod, there will be an o-ring (See Figure 5). Periodically this o-ring needs to be lubricated with a heavy coating of petroleum jelly to ensure a nice tight seal in the pump barrel - delivering as much air as possible per stroke. If you find this o-ring seal to be worn, damaged, or swollen, it will need to be replaced by ordering a pump service kit.*

Figure 4

Figure 5

1. Substance is too thick for the sprayer. These sprayers are not designed to spray liquids with thicker viscosities (i.e., paint, stains, some sealers, etc.). They are ideal for herbicides, insecticides, pesticides, fungicides, fertilizers, and other chemicals with the consistency of water (Caution: Never use flammable liquids, caustics, acids, or hot water in these sprayers.) Please contact our customer service if you have a question regarding a specific chemical.
2. Flat seal (for flat fan tips) is missing or damaged. Remove the nozzle from the wand and then remove the flat fan tip from the cap nut. Make sure there is a flat seal at the bottom of the cap nut. If it is missing or damaged, it can be ordered with the poly nozzle kit or the brass nozzle kit.*
3. Sprayer wand or nozzle is clogged. Remove the nozzle from the wand. Flush wand, shut-off and nozzle with clean, cold water.
4. Dirt or debris in the shut-off valve. The valve is located inside the handle, so the first step is to depressurize the sprayer and release all liquid from the wand. Then unscrew and remove the shut-off assembly from the black rubber grip and hose (See Figure 7). It will come apart right above the section that reads "FILTER". Remove the white filter inside the handle and flush with clean, cold water to remove any debris. Then flush cold water through the shut-off poppet (metal rod located within yellow nut). Press the shut-off lever (like you would as if you were spraying) for the poppet to open and allow the water to flow through. Lastly run cold water through the handle and hose.

Figure 7