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PROBLEM
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CAUSE
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SOLUTION
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Difficulty in moving pump lever
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Dirty bushing
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Remove pump lever, clean & grease bushings
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Dirty cylinder walls (425)
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Remove piston, clean/replace piston & collar
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Collar swollen from long term exposure (425)
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Replace collar and maintain according to instructions
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Lack of lubrication (425)
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Lubricate Viton collar
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Insufficient resistance during repeated pumping and no pressure
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Damaged/dirty valve plates
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Clean or replace valve plates or cylinder
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Damaged O-ring at valve seat
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Replace O-ring
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Collar or piston (425) worn
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Replace collar or piston
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Seal in pressure regulator is leaking
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Check seal and valve seat
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High resistance after just a few pumping strokes, pressure lasts only briefly
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Little or no air cushion in pressure cylinder
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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
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Wrong formula tank cap (no vent hole)
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Replace with vented cap
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Vent hole clogged
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Clean vent hole.
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Lower valve plate sticks
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Replace valve plate
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Intake channels clogged
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Clean channels & tank
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When handle is pulled up it wants to move itself forcibly back down
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Inlet screen at base of pressure cylinder clogged
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Clean intake screen with a small brush and detergent
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Leaks inside cylinder (425)
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Damaged/dirty collar or piston
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Clean or replace collar and possibly cylinder if worn
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Leaks outside cylinder (425)
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Damaged O-ring on cylinder
Damaged O-ring on pressure cylinder
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Replace O-ring
Replace O-ring
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Leaks from diaphragm pump (474, 475, 476, 485)
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Damaged diaphragm
Damaged O-ring on diaphragm housing
Damaged O-ring on pressure cylinder
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Replace diaphragm
Replace O-ring
Replace O-ring
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Leaks from end of spray wand
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Worn or damaged shut-off valve
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Inspect and rebuild shut-off valve
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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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