Croplands PEGASUS 4000, Parts & Operators Manual

Page: 71 / 168

5.5 Pegasus BT-POM 1212 - Rev 3
Section 5 Diaphragm Pumps
Excessive
Diaphragm Failure
If you have excessive diaphragm failure
check the following points. These will
cause failure of diaphragms due to added
stress or chemical attack.
1. Most Important - Pump not being
flushed out daily with clean water
after use.
2. Oil level too low allowing air between
piston and diaphragm.
3. Air leaks in suction line.
4. Restricted suction line.
5. Restriction through suction filter.
6. Not cleaning suction filter regularly.
7. Worn suction and discharge valves.
8. Bypass line too small to carry full
capacity of pump.
9. In cold climates - frozen suction/
discharge lines or water remaining in
the pump after flushing.
10. Incorrect air setting or no air in air
chamber.
11. Agitator excessively restricting bypass
from pump.
12. Diaphragm material construction
incorrect for chemical or solution
being pumped.
13. Chemicals containing toluene
or other aggressive solvents
may require viton diaphragms
- particularly if the pump is not
properly flushed after use.
Pre-Season
Servicing
For thorough pre-season servicing -
check all aspects of the Pegasus and its
operating components as outlined in the
pre-delivery check list on page 1.7.
Pump Storage and
Corrosion Protection
1. Warm Climates
If you operate in a warm climate with
no chance of frost in the winter, you
will not have any problems with frost
damage.
If you are storing your sprayer
between seasons, ensure your
pump has been thoroughly flushed
with clean water. A good idea is
to run a mixture of 1% solution of
summer mineral spraying oil through
the pump and plumbing system.
Summer spraying oil is water-soluble
oil such as DC-Tron. This will coat
and protect all internal pump parts.
Ensure this mixture is flushed out
before spraying commences in the
new season.
2. Cold Climates
For prolonged storage, an anti-
freeze mixture can be flushed
through the pump. Ensure this is
thoroughly flushed out prior to the
commencement of spraying again.
If the pump is being stored overnight
and a risk of freezing is imminent,
drain all liquid from the pump and
lines, including boom lines.