Chapin Mixes On Exit 15L Backpack Sprayer

Quick Guide

The Chapin Mixes On Exit backpack sprayer is designed for precise chemical application. Before use, perform a pre-use check to ensure all connections are tight, including the hose nut, nozzle, wand, pump clamp, and pump lever bolts. Always wear protective gear (goggles, gloves, long sleeves, pants, and full foot protection) when spraying. Do not exceed a solution temperature of 120°F (49°C).

Safety Warnings

• Explosion Hazard: Do not leave a pressurized sprayer in the hot sun. Never pressurize the sprayer using any means other than the original pump.
• Chemical Safety: Never spray flammable, caustic, acidic, chlorine, bleach, or other corrosive solutions. Always follow the chemical manufacturer's instructions.
• Cleaning: If the sprayer has been used for herbicides, clean it thoroughly before using it for plant feeding or general household use.

Assembly

Nozzle Assembly

To disassemble, unscrew the nozzle cap from the nozzle body while the retaining nut is fastened to the elbow. Unscrew the retaining nut and push the nozzle body and gasket out. Reverse these steps to reinstall.

Pump Handle Installation

The pump handle can be mounted on either the left or right side of the pump shaft. Align the handle holes with the shaft holes, slide the bolts through, and tighten the nuts.

Shoulder Strap Installation

The backpack features a shoulder strap, chest strap, waist belt, and lumbar support. The top of the shoulder strap attaches to the top of the tank, and the lumbar support hook attaches to the base tube at the bottom of the tank.

Operation

Filling the Tank

Ensure the filter basket is in place to prevent debris from entering the tank. Fill the sprayer tank with water. For the chemical tank, push it up to remove, fill it on a flat surface, and snap it back onto the sprayer.

Mixes On Exit Adjustment

Set the sprayer knob to the desired concentration. The setting controls how quickly the chemical is delivered per gallon. For calibration, fill both tanks with water, weigh the concentrate tank, spray 1 gallon of water, and weigh the concentrate tank again to calculate the mix ratio.

Spraying

Use rapid pump strokes to prime the pump. For continuous spraying, push down on the handle and move the red locking mechanism to the lock-on position. To stop, move the mechanism to the neutral position.

Maintenance and Cleaning

The sprayer features a 3-stage filtering system: a filter basket in the tank opening, an in-tank filter at the pressure cylinder inlet, and a removable filter in the shut-off assembly. Clean these filters periodically to ensure consistent flow.

Cleaning Procedure:

1. Empty the sprayer and clean the tank thoroughly after each use.
2. Pump the handle until all contents and air exit through the nozzle (minimum 30 strokes).
3. Fill the tank halfway with water and repeat the pumping process.

Troubleshooting

If you experience a rapid drop in pressure, drain the sprayer completely and pump the handle with an empty tank to refill the pressure chamber with air. For other issues, such as leaks or difficulty pumping, refer to the troubleshooting table in the manual for specific component checks, such as valve plates, O-rings, and hose clamps.

Repair

The manual provides detailed steps for disassembling and repairing the piston pump and the shut-off valve. Always release pressure before performing repairs. When replacing parts, use only manufacturer-original components.