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4.3 Corrective Maintenance
Situation
Cause
Resolution
NO PUMP DISCHARGE
• Suction &/or discharge check
valves not seating
• Pump vapour locked
• Suction or discharge line
plugged/blocked
• Clean or replace suction &/or
discharge check valves
• Open bleed plug & prime
• Check for closed isolating valve
• Check inlet and discharge lines for
blockage
PUMP DOES NOT CYCLE • Plunger stuck due to tight or
dry seal
• Process line pressure too high
for unit selected
• Blown fuse
• No power supply to DC motor
drive
• Timer switch in OFF position
• Timer set to minimum cycle
rate
• Check seal, if swollen , check
chemical compatibility and replace
• Check selection and ensure
discharge line is not blocked
• Check and replace fuse in DC
supply. If this condition repeats
itself, check the drive mechanism
for seizure.
• Check and connect correct power
supply
• Set switch to CONTINUOUS for
testing
• Adjust timer accordingly
SHORT SEAL LIFE
• Nick, Burr or scratches on
plunger
• Seal &/or plunger materials not
compatible with chemical being
injected
• Lack of lubricant
• Incorrect lubricant or chemical
crystallising on plunger and
scoring seal/plunger
• Replace plunger
• Refer to chemical compatibility
charts or contact Solar Injection
Australia
• Maintain visible lubricant level in
reservoir.
• Change lubricant to be compatible
with chemicals being pumped.