Solo 425 - Operating Features; Nozzle Tip Specifications Overview; Spray Tip Assembly Guide; Spraying Operation

3
BACKPACK SPRAYER TROUBLE SHOOTING GUIDE
PROBLEM
Difficulty In moving Pump lever
Insufficient resistance during
repeated pumping
and no pressure
High resistance after just a few
pumping strokes, pressure lasts
only briefly
During Spraying, upward
pumping becomes more &
more difficult and tank walls
may indent inwards.
When handle is pulled up it
wants to move itself forcibly
back down.
Leaks inside cylinder (425)
Leaks outside cylinder (425)
Leaks on diaphragm pump (475)
Leaks from end of spray Wand
CAUSE
Dirty bushing
Dirty cylinder walls (425).
Collar swollen (425) from long
term exposure
Lack of lubrication (425).
Damaged/ dirty valve plates
Damaged o-ring at valve seat
Collar or piston (425) worn
Sealing in pressure regulator
is leaking
Little or no air cushion in
pressure cylinder
Wrong formula tank cap
(No vent hole)
Vent hole clogged
Lower valve plate sticks
Intake channels clogged
Screen at base of pressure
cylinder clogged
Damaged/ dirty collar or piston
Damaged o-ring on cylinder
Damaged o-ring on pressure
cylinder
Damaged diaphragm
Damaged o-ring on diaphragm
housing
Damaged o-ring on pressure
cylinder
Worn or damaged shut-off
valve
SOLUTION
Remove pump lever, clean &
grease bushings
Remove piston, clean/ replace
piston & collar
Replace collar and maintain
according to instructions
Lubricate viton collar
Clean or replace valve plates or
cylinder
Replace o-ring
Replace collar or piston
Check seal and valve seat
Remove PVC hose, drain
pressure cylinder, reconnect
hose, preventive measure:
release pressure after each use
Replace with vented cap
Clean vent hole
Replace valve plate
Clean channels & tank
Clean intake screen with a
small brush and detergent
Clean or replace collar and
possibly cylinder if worn
Replace o-ring
Replace o-ring
Replace diaphragm
Replace o-ring
Replace o-ring
Inspect and rebuild shut-off
valve