99
DIAPHRAGM PUMP PROBLEMS
PROBLEM
PROBABLE CAUSE
REMEDY
A . Pump does not draw or
deliver liquid. Pressure
gauge fluctuates badly
1. The pump is sucking in air through suction line.
2. Air has not been entirely evacuated from the pump.
3. Blocked suction filter.
4. Damaged or worn suction valves.
1. Examine the suction hose and ensure it is firmly secured.
2. Rotate the pump with outlet hose and taps open.
3. Clean suction filter.
4. Replace suction valves.
B. Liquid flow is irregular
(Also check items under A)
1. The air in the air chamber of the pump is incorrectly set.
2. Diaphragm split.
3. Damaged or worn valves.
4. Foreign matter holding valves open.
1. Check pressure in air chamber of pump. Set as required (refer p.49).
2. Replace diaphragm.
3. Replace valves.
4. Clean valves.
C. Pump delivers insufficient
pressure
1. Regulating valve:
• Sticking open
• Not set for pressure
• Damaged or worn seat or spring
2. Cylinder diaphragm ruptured.
3. Pump valves blocked, worn or damaged.
4. Spray nozzles worn, missing or exceed pump capacity.
1. Fix the regulator:
• Unstick/renew the valves
• Set the pressure
• Replace the spring
2. Replace diaphragms.
3. Unblock valves and or replace.
4. Replace spray nozzles with appropriate size.
D. Output drops & pump
is noisy
1. Blocked suction lines or filter screen.
1. Check and clean as required.
E. Oil being discharged
through delivery line or
discoloured oil in sight
glass of pump
1. One or more diaphragms split or ruptured.
1. Immediately drain oil from pump and flush to remove all spray
residues from sump. Remove pump heads & fit new diaphragms.
Fill to correct level with oil as per pump manual.
SECTION 9
TROUBLESHOOTING
Summary of Contents for Cropliner 1500XL
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