|
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. |
