SANDPIPER MHP2M - Manual (Page 4)

Model MHP2M Page 4 mhp2mdl4sm-rev0513
TROUBLE SHOOTING
1. Pump will not cycle
A. Check to make sure the unit has enough pressure to operate and that the air
inlet valve is open.
B. Check the discharge line to insure that the discharge line is neither closed nor
blocked.
C. If the spool in the air distribution valve is not shifting check the main spool. It
must slide freely.
D. Excessive air leakage in the pump can prevent cycling. Air leakage from the
exhaust port indicates leakage in the air distribution valve. See further service instruc-
tions.
E. Blockage in the liquid chamber can impede movement of diaphragm.
2. Pump cycles but will not pump
A. Suction side of pump pulling in air. Check the suction line for air leaks and be
sure that the end of the suction line is submerged. Check flange bolting. Check valve
flanges and manifolds to chamber flange joints.
B. Make certain the suction line or strainer is not plugged. Restriction at the suc-
tion is indicated by a high vacuum reading when a vacuum gauge is installed in the
suction line.
C. Check valves may not be seating properly. To check, remove the suction line and
cover the suction port with your hand. If the unit does not pull a good suction (vacuum),
the check valves should be inspected for proper seating.
D. Static suction life may be too high. Priming can be improved by elevating the
suction and discharge lines higher than the check valves and pouring liquid into the
unit through the suction inlet. When priming at high suction lifts or with long suction
lines operate the pump at maximum cycle rate.
3. Low performance
A. Capacity is reduced as the discharge pressure increases. Performance
capability varies with available inlet supply. Check air pressure at the pump inlet when
the pump is operating to make certain that adequate air supply is maintained.
B. Check vacuum at the pump suction. Capacity is reduced as vacuum increas-
es. Reduced flow rate due to starved suction will be evident when cycle rate can
be varied without change in capacity. This condition will be more prevalent when
pumping viscous liquids. When pumping thick, heavy material the suction line must
be kept as large in diameter and as short as possible, to keep suction loss minimal.
C. Low flow rate and slow cycling rate indicate restricted flow through the
discharge line. Low flow rate and fast cycling rate indicate restriction in the suction line
or air leakage into suction.
For more information, refer to the Warren Rupp Troubleshooting Guide.
WARRANTY: This unit is guaranteed for a period of five years against defective
material and workmanship.
For high pressure pumps used in conjunction with another diaphragm pump in “skid
mount” system: The EH2-M will not prime against the head created by the fill pump.
Run both simultaneously at start-up.
RECOMMENDED WARREN RUPP ® ACCESSORIES
TO MAXIMIZE PUMP PERFORMANCE:
• Tranquilizer ® Surge Suppressor. For nearly pulse-free flow.
• Warren Rupp Air Dryer. For clean, dry compressed air.
• Warren Rupp Filter/Regulator. For modular installation and
service convenience.
• Warren Rupp Speed Control. For manual or programmable
process control. Manual adjustment or 4-20mA reception.
For more detailed information on these accessories, contact your local
Warren Rupp Factory-Authorized Distributor, or Warren Rupp corporate
headquarters.