|
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. |
