pb025nmdl3sm-rev0913
Page 6
TROUBLESHOOTING
Possible Symptoms:
• Pump will not cycle.
• Pump cycles, but produces no
flow.
• Pump cycles, but flow rate is
unsatisfactory.
• Pump cycle seems unbalanced.
• Pump cycle seems to produce
excessive vibration.
What to Check:
Excessive suction lift
in system.
C o r r e c t i v e A c t i o n :
F o r l i f t s
exceeding 20 feet (6 meters), filling the
pumping chambers with liquid will prime
the pump in most cases.
What to Check:
Excessive flooded
suction in system.
Corrective Action:
For flooded
conditions exceeding 10 feet
(3 meters) of liquid, install a back
pressure device.
What to Check:
System head exceeds
air supply pressure.
Corrective Action:
Increase the
inlet air pressure to the pump. Most
diaphragm pumps are designed for 1:1
pressure ratio at zero flow.
What to Check:
Air supply pressure or
volume exceeds system head.
Corrective Action:
Decrease in-
let air pressure and volume to the
pump as calculated on the published
PERFORMANCE CURVE. Pump is
cavitating the fluid by fast cycling.
What to Check:
Undersized suction
line.
Corrective Action:
Meet or exceed
pump connection recommenda-
tions shown on the DIMENSIONAL
DRAWING.
What to Check:
Restricted or
undersized air line.
Corrective Action:
Install a larger
air line and connection. Refer to air
inlet recommendations shown in your
pump’s SERVICE MANUAL.
What to Check:
Check ESADS, the
Externally Serviceable Air Distribution
System of the pump.
Corrective Action:
Disassemble and
inspect the main air distribution valve,
pilot valve and pilot valve actuators.
Refer to the parts drawing and air valve
section of the SERVICE MANUAL.
Check for clogged discharge or closed
valve before reassembly.
W h a t t o C h e c k :
R i g i d p i p e
connections to pump.
Corrective Action:
Install flexible
connectors and a Warren Rupp
®
Tranquilizer
®
surge suppressor.
What to Check:
Blocked air exhaust
muffler.
Corrective Action:
Remove muffler
screen, clean or de-ice and reinstall.
Refer to the Air Exhaust section of your
pump SERVICE MANUAL.
What to Check:
Pumped fluid in air
exhaust muffler.
Corrective Action:
Disassemble
p u m p c h a m b e r s . I n s p e c t f o r
diaphragm rupture or loose dia-
phragm plate assembly. Refer to the
Diaphragm Replacement section of
your pump SERVICE MANUAL.
What to Check:
Suction side air
leakage or air in product.
Corrective Action:
Visually inspect
all suction side gaskets and pipe
connections.
What to Check:
Obstructed check
valve.
Corrective Action:
Disassemble
the wet end of the pump and
manually dislodge obstruction in
the check valve pocket. Refer to
the Check Valve section of the pump
SERVICE MANUAL for disassembly
instructions.
What to Check:
Worn or misaligned
check valve or check valve seat.
Corrective Action:
Inspect check
valves and seats for wear and proper
seating. Replace if necessary. Refer
to Check Valve section of the pump
SERVICE MANUAL for disassembly
instructions.
What to Check:
Blocked suction line.
Corrective Action:
Remove or flush
obstruction. Check and clear all
suction screens and strainers.
What to Check:
Blocked discharge
line.
Corrective Action:
Check for
obstruction or closed discharge line
valves.
What to Check:
Blocked pumping
chamber.
Corrective Action:
Disassemble
and inspect the wetted chambers
of the pump. Remove or flush any
obstructions.
What to Check:
Entrained air or
vapor lock in one or both pumping
chambers.
Corrective Action:
Purge chambers
through tapped chamber vent plugs.
PURGING THE CHAMBERS OF
AIR CAN BE DANGEROUS! Contact
the Warren Rupp Technical Services
Department before performing this
procedure. Any model with top-ported
discharge will reduce or eliminate
problems with entrained air.
If your pump continues to perform
below your expectations, contact
your local Warren Rupp Distributor
or factory Technical Services
Group for a service evaluation.
WARRANTY
This pump is warranted for a period of
five years against defective material
and workmanship. Failure to comply
with the recommendations stated in
this manual voids all factory warranty.
RECYCLING
Many components of Warren Rupp Metallic
AODD pumps are made of recyclable materials
(see chart on page 9 for material specifications).
We encourage pump user to recycle worn out
parts and pumps whenever possible, after any
hazardous pumped fluids are thoroughly flushed.
Before pump operation,
i n s p e c t a l l g a s k e t e d
fasteners for looseness
caused by gasket creep. Re-
torque loose fasteners to
prevent leakage. Follow recommended torques
stated in this manual.
CAUTION
B e f o r e m a i n t e n a n c e
or repair, shut off the
compressed air line,
bleed the pressure, and
disconnect the air line from
the pump. The discharge
line may be pressurized and must be bled of
its pressure.
WARNING
IMPORTANT
Read these safety warnings
and instructions in this
manual completely, before
installation and start-up
of the pump. It is the
responsibility
of the purchaser to retain
this manual for reference. Failure to comply with
the recommendations stated in this manual will
damage the pump, and void factory warranty.
WARNING
Airborne particles and loud
noise hazards.
Wear ear and eye
protection.
B e f o r e d o i n g a n y
maintenance on the pump,
be certain all pressure is
completely vented from the
pump, suction, discharge,
piping, and all other
openings and connections. Be certain the air
supply is locked out or made non-operational,
so that it cannot be started while work is being
done on the pump. Be certain that approved
eye protection and protective clothing are worn
all times in the vicinity of the pump. Failure to
follow these recommendations may result in
serious injury or death.
WARNING
This pump is pressurized
internally with air pressure
during operation. Always
make certain that all bolting
is in good condition and
that all of the correct bolting
is reinstalled during assembly.
WARNING
When used for toxic or
aggressive fluids, the pump
should always be flushed
clean prior to disassembly.
WARNING
WARNING
In the event of diaphragm
rupture, pumped material
may enter the air end of the
pump, and be discharged
into the atmosphere. If
pumping a product which is hazardous or toxic,
the air exhaust must be piped to an appropriate
area for safe disposition.
Take action to prevent static
sparking. Fire or explosion
can result, especially when
handling flammable liquids.
The pump, piping, valves,
containers or other miscellaneous equipment
must be grounded.
WARNING
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