SANDPIPER EB2-SM - Manual (Page 4)

MODEL EB2-SM PAGE 4 520-097-000 8/00
PILOT VALVE ACTUATOR
The bushings for the pilot valve actuators are threaded into the intermediate
bracket from the outside. The plunger may be removed for inspection or replacement
from the inside by removing the air distribution valve body and the pilot valve body
from the pump. The plungers should be visible as you look into the intermediate from
the top. Depending on their position, you may find it necessary to use a fine piece of
wire to pull them out.
Under rare circumstances, it may become necessary to replace the o-ring seal.
The bushing can be turned out through the inner chamber by removing the outer
chamber assembly to reach the bushing.
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. This condition will be
evident. Air leakage into the discharge line indicates a ruptured diaphragm. Air
leakage from the exhaust port indicates leakage in the air distribution valve. See
further service instructions.
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 manifold to chamber flange joints.
B. Make certain the suction line or strainer is not plugged. Restriction at the suction
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 lift 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, as indicated on the
performance curve. Performance capability varies with available inlet air 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 increases.
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 materials 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.
D. Unstable cycling indicates improper check valve seating on one chamber. This
condition is confirmed when unstable cycling repeats consistently on alternate
exhausts. Cycling that is not consistently unstable may indicate partial exhaust
restriction due to freezing and thawing of exhaust air. Use of an anti-freeze lubri-
cant in an air line lubricator should solve this problem.
For additional information, see the Warren Rupp Troubleshooting Guide.
WARNING
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.
CAUTION
BEFORE PUMP OPERATION all external
gasketed fasteners must be inspected
for looseness caused by gasket creep
after leaving the factory. Retorque loose
fasteners to insure against leakage.
Follow recommended torques where
called out. A card is attached to each
new pump stating this fact.
IMPORTANT
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.