Chapin 61900 Tree/Turf Pro Backpack Sprayer

Important Safety Information

⚠️ WARNING! Improper use or failure to follow instructions can result in product failure or injuries. Read and follow all instructions before using.

⚠️ WARNING: Handling brass parts may expose you to lead, a chemical known to cause birth defects and other reproductive harm. Wash hands after handling.

Rules for Safe Operation

• Before assembling and operating, read all instructions thoroughly.
• When working with pressurized equipment, safety precautions must be observed.
• NEVER spray flammable materials or pressure/gas producing chemicals.
• ALWAYS read chemical labels before filling.
• ALWAYS wear protective gear: goggles, gloves, long-sleeve shirt, long pants, and full foot protection. Work in a ventilated area or outdoors.
• PRE-USE CHECK: Ensure hose nut is tight, hose is securely attached to the tank, and all nozzle/wand connections are tight.
• DO NOT leave a pressurized sprayer in hot sun or near heat sources.
• NEVER pressurize sprayer by any means other than the original pump.
• DO NOT attempt to modify or repair with non-original parts.

NOTE: Tank and hose may contain residual water from quality testing.

Sprayer Components & Use Information

Pressure Regulator

The sprayer has a built-in, adjustable regulator. To adjust:

1. Remove tank cap and filter basket.
2. Locate the regulator knob (four fingers numbered 1-4 corresponding to 15, 30, 45, 60 psi).
3. Push down on the knob and rotate to align with the desired pressure setting.
4. To adjust spray pressure, release excess pressure into the tank through the spray wand.

Higher pressure results in more liquid output but smaller droplets, increasing drift.

4-Stage Filtering System

The sprayer is equipped with a 4-stage filtering system:

• Stage 1: Filter basket in tank opening.
• Stage 2: Removable In-Tank filter (at pressure cylinder inlet).
• Stage 3: Removable filter cartridge (integrated into pressure cylinder).
• Stage 4: Removable filter (at shut-off assembly inlet).

Periodic cleaning is recommended for consistent fluid flow and component longevity.

CF Valve™ Assembly

Assemble nozzle gasket to CF Valve™ inlet, screw onto elbow. Place fan nozzle tip into retaining nut, then gasket onto tip flange. Screw assembly onto CF Valve™ outlet. Reverse to uninstall.

The CF Valve™ is designed for fixed nozzles and is rated at 0.4 GPM @ 40 psi.

Nozzle Assembly

Detailed instructions for assembling and disassembling the nozzle are provided with diagrams. Key steps involve unscrewing retaining nuts and caps, replacing gaskets and tips.

Wand Assembly

1. Ensure o-ring is on wand end. Insert wand into shut-off valve. 2. Turn and tighten screw cap.

Installing the Pump Handle

Hardware is included. Mount handle on either end of shaft (A). Align handle (C) and shaft holes. Insert cotter pin (B) through aligned holes.

Installing the Shoulder Strap

Attach top of straps to tank. Clip lower ends to metal frame where it exits the tank.

Wand Clip

The wand can be attached to the metal frame using wand clips.

Disassembling and Repairing

Shut-Off Valve

Instructions for disassembling and repairing the shut-off valve are provided, involving removing a retaining pin, handle, screw cap, spring, and valve body. Parts should be replaced if worn. Lubricate o-rings and reassemble.

Piston Pump

Detailed steps for disassembling the piston pump are provided, including removing the pump handle, hose, protective cap, lever bolts, and piston assembly. Instructions cover checking for scratches, replacing the collar, valve plates, and o-rings. Reassembly involves greasing o-rings and aligning components.

Pressure Cylinder

Remove pressure cylinder only if the cartridge filter is clogged or there's a leak at the tank union. Steps include releasing pressure, removing hose, In-Tank filter, pivot lever bolts, and the main clamp. The cylinder is then rocked and pushed free. Reassembly is the reverse.

Specific instructions for cleaning/replacing the filter cartridge in the pressure cylinder base, replacing the pressure cylinder o-ring, and adjusting/replacing the pressure regulator are also included.

Filling the Sprayer

1. Ensure filter basket is in place.

2. Determine water amount based on chemical label ratio.

3. Add chemical, then water through the filter basket.

4. Stir mixture. The sprayer capacity is 4 gallons (15.0L) plus chemical.

You do not need to fill the tank completely each time.

Always follow chemical manufacturer's instructions.

Helpful Spraying Information

• Use RAPID pump strokes to prime.
• Firm resistance indicates pressure cylinder is filling.
• Shut-off lever opens the valve. A retaining clip can hold it in the "OPEN" position.
• Use the END of the pump handle for easy pumping.
• Spray delivery depends on pressure regulator setting and pump stroke rate.
• If pressure drops rapidly: drain sprayer, pump with empty tank. This refills the pressure cylinder with air.

Powder-Based Chemicals: These are often abrasive. Ensure they are fully dissolved. Clean sprayer thoroughly after use.

Cleaning

1. Empty and clean tank thoroughly after each use.
2. Pump handle until all contents and air exit through the nozzle.
3. Fill tank halfway with water and pump out. Repeat as needed.

Other Cleaning Hints:

• Poor spray distribution usually means a clogged nozzle. Remove and clean it.
• Soap can be added to water for cleaning.
• Do not use strong cleaning agents or abrasives.
• Follow chemical manufacturer's recommendations for waste disposal.
• Follow chemical manufacturer's instructions for cleanup.

Storing / Maintaining Your Sprayer

• Store out of direct sunlight in a cool, dry space.
• Before freezing weather, drain all liquid from tank, pump, pressure cylinder, hose, shut-off valve, wand, and nozzle to prevent expansion and cracking. Lock shut-off valve in "open" position.
• For service, contact nearest Chapin dealer and insist on original Chapin parts.
• Regularly inspect hose, wand, pump, tank, and shut-off valve for wear, damage, or leaks. Repair promptly.

Troubleshooting

Troubleshooting Your Sprayer

• Symptom: Difficulty actuating pump lever.
  Possible Reason: Dirty bushing.
  Solution: Remove lever, clean & grease bushings.
• Symptom: Little or no resistance during pumping - no pressure.
  Possible Reason: Dirty piston cylinder wall / Dirty piston collar / Damaged or dirty valve plate / Damaged O-ring at valve seat / Piston Collar or piston cylinder assembly worn / Leaky seal in pressure regulator.
  Solution: Clean/grease piston assembly, lubricate/replace collar, clean/replace valve plate, replace O-ring, replace collar/cylinder assembly, tighten/replace regulator.
• Symptom: Too much resistance after a few pumps, but pressure only lasts briefly.
  Possible Reason: Insufficient air cushion in pressure cylinder / Vent hole clogged / Upper valve plate sticks / Clogged intake filter.
  Solution: Drain cylinder, reconnect hose. Clear vent hole. Clean/replace valve plate. Clean In-Tank filter/cartridge filter.
• Symptom: Upward pumping more difficult and/or tank wall indents.
  Possible Reason: Valve plate sticking.
  Solution: Clean/replace valve plate.
• Symptom: Handle moves itself back down when pulled up.
  Possible Reason: Damaged/Dirty Collar / Damaged Piston Cylinder / Damaged Piston / Worn Piston Cylinder O-ring.
  Solution: Clean/Replace Collar. Replace Piston Cylinder. Replace Piston. Replace O-rings.
• Symptom: Leaks at Piston Cylinder.
  Possible Reason: Connections loose / Damaged or worn shut-off / Damaged or worn o-ring/gasket.
  Solution: Tighten connection. Rebuild/replace shut-off valve. Replace o-ring/gasket.
• Symptom: Shut-off leaks.
  Possible Reason: Connections loose / Worn or damaged shut-off.
  Solution: Tighten connection. Rebuild or replace shut-off valve.
• Symptom: Wand assembly leaks.
  Possible Reason: Connections loose / Damaged or worn o-ring/gasket.
  Solution: Tighten connection. Replace o-ring/gasket.
• Symptom: Nozzle assembly leaks.
  Possible Reason: Connections loose / Damaged or worn o-ring/gasket.
  Solution: Tighten connection. Replace o-ring/gasket.
• Symptom: Leak between pressure cylinder and tank.
  Possible Reason: Clamp loose / O-ring worn or damaged.
  Solution: Tighten clamp. Replace pressure cylinder o-ring.
• Symptom: Hose leaking at tank outlet.
  Possible Reason: Clamp loose.
  Solution: Tighten clamp.

Replacement Parts

A list of replacement parts is provided with part numbers and names. Key components include:

• 6-8178 Piston Cylinder Assembly
• 6-8179 Pump Piston Assembly
• 6-8151 Pressure Regulator
• 6-8146 Filter Basket & Cap
• 6-8181 Straps
• 6-8165 CF Valve™
• Nozzle Assemblies (various types: 6-8096 Flat Fan, 6-8122 Brass Adjustable, 6-8093 Poly Adjustable)
• 6-8148 Nozzle Kit
• 6-8169 Filter Replacement Kit
• 6-8173 Wand Assembly
• 6-8105 Hose Assembly
• 6-8175 Shut-off Assembly
• 6-8120B Shut-off Valve Repair Kit
• 6-8177 Gauge
• 6-8180 Piston Pump Repair Kit
• 6-8153 O-ring Kit
• 6-8189 Wand Clips

Contact Information

Chapin International, Inc.

P.O. Box 549

700 Ellicott St.

Batavia, NY 14021-0549 U.S.A.

Phone: 1-800-950-4458

Website: www.chapinmfg.com

For warranty registration, visit: www.chapinmfg.com/warranty.asp

DO NOT RETURN THIS SPRAYER TO STORE. CALL: 1-800-950-4458