SANDPIPER ET2 - M - Manual (Page 8)

et2dl2sm-0614 Model ET2-M Type 1 Page 7
ate. It may be necessary to use a fine piece of wire to pull them out. The bushing can
be turned out through the inner chamber by removing the outer chamber assembly.
Replace the bushings if pins have bent (see Fig. 10 and Fig. 11).
SERVICE INSTRUCTIONS: 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 (vacu-
um), the check valves should be inspected for proper seating.
D. Static suction lift may be too high. Priming can be improved by elevating the suc-
tion 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.
E. Incorrect driver fluid level or air has not been properly purged.
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 var-
ied 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 ex-
hausts. Cycling that is not consistently unstable may indicate partial exhaust restric-
tion due to freezing and thawing of exhaust air. Use of an anti-freeze lubricant in an
air line
lubricator should solve this problem.
E. Incorrect driver fluid level or air has not been properly purged.
For additional information, see the Warren Rupp Trouble Shooting Guide.
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.