ENCORE
®
700 METERING PUMP
Table 4.3 - Troubleshooting
No Feed Rate or
Insufficient Feed Rate.
Zero or insufficient stroke
length.
Adjust to proper stroke length.
Ball valves on suction or
discharge side do not close
tightly.
Replace balls in valves. Remove
possible deposits in valves or pump
head. Replace pump head.
Gas in suction line or pump
head.
Check for cavitation and, if
necessary, use a suction line with
a larger inside diameter. Dilute the
liquid (sodium hypochlorite).
Air in suction line or pump
Bleed the suciton line and pump
Shut-off valves in suction or
discharge lines are closed.
Open valves.
Damaged drive mechanism.
Check mechanism and replace
No Feed Rate on Point of
Application, Though Pump
is Running.
Pressure relief valve is defective
or misadjusted, so that the
liquid flows back into the
Adjust pressure relief valve to
proper relief pressure.
Liquid is Emerging From
Pump Head Near the
Diaphragm.
Broken diaphragm or broken
crosshead oil seal.
Replace diaphragm, or replace oil
seal.
Pump is Pumping
Erratically or Feed Rate is
Inaccurate.
No back pressure.
Install back pressure valve into the
discharge line. Discharge pressure
must be at least 15 PSI more than
the suction pressure.
Erratic Diaphragm
Movement or No
Movement At All.
Diaphragm Movement
Does Not Correspond to
the Stroke Length Setting
Adjuster bearing (23) is loose
or completely unscrewed.
Remove the knob and tighten the
adjuster bearing. Clean the threads
of oil and apply "Locktite 242".
Extremely Noisy or Hot
Gear Box.
Insufficient lubrication or
defective bearing(s).
Check oil level through oil
check hole, if required, replace
bearing(s).
Incorrect worm shaft end play.
Add or remove shims to achieve
Motor Will Not Run.
Power off or fuse is blown.
Turn on the power. Replace the
fuse after correcting the cause.
WT.440.400.001.UA.IM.1012
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