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Solo Sprayers > Solo Sprayer Parts > Solo Backpack Sprayer Troubleshooting Guide

Solo Backpack Sprayer Troubleshooting Guide

Difficulty in moving pump lever Dirty bushing Remove pump lever, clean & grease bushings
Dirty cylinder walls (425) Remove piston, clean/replace piston & collar
Collar swollen from long term exposure (425) Replace collar and maintain according to instructions
Lack of lubrication (425) Lubricate Viton collar
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Insufficient resistance during repeated pumping and no pressure Damaged/dirty valve plates Clean or replace valve plates or cylinder
Damaged O-ring at valve seat Replace O-ring
Collar or piston (425) worn Replace collar or piston
Seal in pressure regulator is leaking Check seal and valve seat
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High resistance after just a few pumping strokes, pressure lasts only briefly Little or no air cushion in pressure cylinder Remove PVC hose, drain pressure cylinder, Reconnect hose. Preventive measure - release pressure after each use
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During spraying, upward pumping becomes more & more difficult and tank walls may indent upwards Wrong formula tank cap (no vent hole) Replace with vented cap
Vent hole clogged Clean vent hole.
Lower valve plate sticks Replace valve plate
Intake channels clogged Clean channels & tank
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When handle is pulled up it wants to move itself forcibly back down Inlet screen at base of pressure cylinder clogged Clean intake screen with a small brush and detergent
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Leaks inside cylinder (425) Damaged/dirty collar or piston Clean or replace collar and possibly cylinder if worn
Leaks outside cylinder (425) Damaged O-ring on cylinder

Damaged O-ring on pressure cylinder
Replace O-ring

Replace O-ring
Leaks from diaphragm pump  (474, 475, 476, 485) Damaged diaphragm

Damaged O-ring on diaphragm housing

Damaged O-ring on pressure cylinder
Replace diaphragm

Replace O-ring

Replace O-ring
Leaks from end of spray wand Worn or damaged shut-off valve Inspect and rebuild shut-off valve

Note: Always wear rubber gloves, safety goggles and appropriate protective clothing when repairing a sprayer. Work in well ventilated area. Prior to repair, flush unit with water by filling, then spraying the water into an appropriate container or area. Ensure that all pressure is released by locking the shut-off valve in the open position. Once a repair is completed, fill the unit with clean water, pressurize, and check for leaks. If the sprayer leaks, Do Not Use. Repair leaks and recheck.

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