Product Manual

Two marks in correspon-
dence to valve seat
Causes
1. Restricted suction.
Blocked suction filter.
Suction hose blocked or
kinked. Suction lift too
high. Spray mixture too
thick (dense)
2. Pump RPM above specifi-
cation
3. Suction valve not sealing
4. Cylinder Sleeve holes not
in correct position
5. Chemical incompatible
with diaphragm material,
in addition to one of the
above causes.
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Fatigued and worn under-
neath piston retaining disc
and two marks in corre-
spondence to valve seat.
Causes
1. Chemical incompatible
with diaphragm material
2. Diaphragm swollen and
soft
3. Diaphragm soft and
spongy (Below 60º)
4. Diaphragm profile dis-
torted
5. Diaphragm shape dis-
torted
6. Increase in external di-
ameter
7. Diaphragm swollen
Straight fracture
Causes
Incorrect air bleeding, air
trapped under diaphragm
Fracture on external diame-
ter and worn or fatigued
under piston retaining disc.
Causes
Fatigue breakage, diaphragm
worn out
Remedy
Diaphragm must be checked
once a year.
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A. Standard shape
B. Diaphragm distorted
B. Swollen diaphragm
Circular fracture on piston
side of diaphragm that is
same size as piston.
Causes
1. Excessive wear between
piston and valve
2. Suction has too much pres-
sure (excessive head)
3. Low pump RPM
4. Cylinder sleeve holes not in
correct position
5. Delivery valve not sealing
6. Low oil level in pump
OIL
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Common causes of diaphragm failure