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

Solo Backpack Sprayer Troubleshooting Guide

PROBLEM	CAUSE	SOLUTION
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

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

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

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

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

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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