Gorman-Rupp Pumps 06C1-GHH 1071445 and up - Manual (Page 21)

OM-03179 0 SERIES
OPERATION PAGE C - 3
The air cylinder must maintain air pressure of 70 to
140 psi (5,1 to 10,2 kg/cm
@) at the gearbox for air
shift operation.
When shifting from vehicle drive to pump
mode, or vice versa, input shaft rotation
must be limited to no less than 2 RPM or
no more than 15 RPM at the time of the
shift. Stopping the input shaft entirely may
cause a “butt‐shift” condition, which will
prevent the shift from occurring. Shaft rota­
tion in excess of 15 RPM causes raking of
the gears. Either of these conditions can
damage gears, resulting in premature
gearbox failure.
When this pump is operated by a diesel en­
gine, low idle speed should be increased
approximately 200 RPM, or to a speed en­
suring even, vibration‐free operation of the
drive shaft to prevent excessive wear of
components.
OPERATING CHECKS
Leakage
No leakage should be visible at pump mating sur­
faces, or at pump connections or fittings. Keep all
line connections and fittings tight to maintain maxi­
mum pump efficiency.
Strainer Check
If a suction strainer has been shipped with the
pump or installed by the user, check the strainer
regularly, and clean it as necessary. The strainer
should also be checked if pump flow rate begins to
drop. If a vacuum suction gauge has been in­
stalled, monitor and record the readings regularly
to detect strainer blockage.
Never introduce air or steam pressure into the
pump casing or piping to remove a blockage. This
could result in personal injury or damage to the
equipment. If backflushing is absolutely neces­
sary, liquid pressure must be limited to 50% of the
maximum permissible operating pressure shown
on the pump performance curve (see Section E,
Page 1).
Liquid Temperature And Overheating
The maximum liquid temperature for this pump is
160
_
F (71
_
C). Do not apply it at a higher operating
temperature.
Overheating can occur if operated with the valves
in the suction or discharge lines closed. Operating
against closed valves could bring the liquid to a
boil, build pressure, and cause the pump to rup­
ture or explode. If overheating occurs, stop the
pump and allow it to cool before servicing it. Refill
the pump casing with cool liquid.
Allow an over‐heated pump to cool be­
fore servicing. Do not remove plates,
covers, gauges, pipe plugs, or fittings
from an overheated pump. Vapor pres­
sure within the pump can cause parts
being disengaged to be ejected with
great force. After the pump cools, drain
the liquid from the pump by removing
the casing drain plug. Use caution when
removing the plug to prevent injury from
hot liquid.
Pump Vacuum Check
Since the pump does not have a suction check
valve, the discharge line must be fitted with a check
valve if a pump vacuum reading is taken.
With the pump inoperative, install a vacuum gauge
in the system, using pipe dope on the threads.
Block the suction line and start the pump. At oper­
ating speed the pump should pull a vacuum of 15
to 17 inches (381 to 432 mm) or more of mercury
when pumping petroleum. If it does not, check for
air leaks in the seal, gasket, or discharge valve.