GORMAN-RUPP 62-1/2E13-4A084, Technical Manual, Page: 44 / 107

c. Depending upon pumping conditions, the pump may
not start pumping immediately, since it is necessary
for the suction hose to fill with fluid. If, after a
reasonable time, the pump fails to pump, check the
suction line carefully for leaks. A small air leak in
the suction line will greatly reduce pumping efficiency
under any conditions, and especially when the pump
is operating with a high suction lift.
d . This pump does not have self-priming charac-
teristics. When the pump loses prime due to depletion
of the water source or excessive entrance of air into
the suction line, the pump will require repriming.
Refer to figure 2-6.
2-14. OPERATION IN EXTREME COLD
a . Keep the pump free of snow and ice at all times.
Cover it when not in use and provide some shelter
from weather while it is operating if possible.
b. Set inlet temperature control and oil baffle con-
trol to proper position (par. 2-11).
c . Heat the pump body before operating and prime
the pump with warm water.
d . Keep the fuel tank full to prevent condensation
of moisture and service the fuel filter regularly.
e. Lubricate the engine with cold-weather lubricants
as described in the engine manual, TM 5-2805-259-14
f. After operating the pump, refer to figure 2-5, and
drain the body to prevent damage from freezing.
2-15. OPERATION IN EXTREME HEAT
a . Protect the pump from direct rays of the sun
when possible.
b. Allow adequate space for ventilation.
c . Set inlet temperature control and oil baffle con-
trol to proper position (par. 2-11).
d. Keep the exterior of the engine clean to provide
proper heat transfer to the air.
e. Lubricate the engine for hot weather as described
in the engine manual, TM 5-2805-204-14.
2-16. OPERATION AT HIGH ALTITUDES
At high altitudes it may be necessary to adjust the
engine carburetor and service the air filter more
frequently to insure proper air and fuel mixture.
Carburetor adjustments are provided in engine manual,
TM 5-2805-259-14
2-6