24.2. Safety Bypass Switch
The safety bypass switch (14, fig. 11) provides a means
shuts down the engine if conditions of excessive water
of overriding the control that automatically
temperature or low oil pressure are encountered.
Section III. OPERATION UNDER USUAL CONDITIONS
operates at governed speed (approx.
(3) The pump should prime and pump within
a. Perform the
5 minutes. If the engine runs for more
than 5 minutes without pumping, there is
b. Make sure the valves in both the intake and
probably a mechanical defect. Shut down
discharge lines are open.
the pump engine; check for leaks in the
intake lines and check for other defects.
(4) Maintain a check of the intake pressure
gage (13) and of the discharge pressure
Prime the pump as directed in
gage (9) to assure that the pump is
operating within normal capabilities. If
c. Position of Controls.
(1) Increase or decrease the pumping rate of
the pump by varying the setting of the
throttle (5). No other control operation is
b. Perform the daily preventive maintenance (para
necessary during operation.
(2) Do not completely close any valves in the
discharge line. This will cause heating of
the fluid in the pump. Make sure that
some passage of fluid continues through
the pump during operation.
a. Preliminary Steps To Be Taken Before Starting
d. Details on Performance of Pump.
(1) Pump performance at 1,800 rpm and at
(1) Prime the pump by removing the primer
normal elevations must be as indicated in
port plug (7, fig. 4) and filling the pump
casing with the fluid being pumped. Fill
(2) For operations at higher elevations, refer
until fluid reaches the top of the priming
port. Reinstall the plug.
Never operate the engine without
first priming the pump.
(2) Perform the daily preventive maintenance
b. Starting the Equipment.
(2) After the engine has warmed up, push in
the throttle (5, fig. 11) so that the engine