SANDPIPER GH2 - Manual (Page 4)

Model GH2 Page 4 gh2dl1sm-REV0714
1. Pump will not cycle
A. Check to make sure the unit has enough pressure to operate and that the gas
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 gas distribution valve is not shifting check the main spool. It
must slide freely.
D. Excessive gas leakage in the pump can prevent cycling. Natural Gas leakage
from the exhaust port indicates leakage in the gas distribution valve. See further ser-
vice 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 gas 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 gas pressure at the pump inlet when the pump
is operating to make certain that adequate gas 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 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 gas
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.