Turn off the ignition switch and
(6) Check valve. Examine the operation
stop the engine.
of the check valve and be sure that it
(2) Fuel and oil. Check fuel and oil
can be adjusted to close automati-
levels. Add fuel and oil as neces-
cally when the pumping operation is
(7) Visual inspection. Make a complete
(3) Check the entire unit for leaks, pay-
visual inspection of the pumping
ing particular attention to the pump
unit. Check for any missing bolts
seal. Report all deficiencies. Do not
and nuts. Examine the engine air
start operation again if there is a
shrouds for dents and dirt which
bad leak that cannot be corrected im-
would restrict the normal flow of air.
mediately. Examine the suction hose
See that the tires are filled with air to
assembly and check valve connections
a pressure of 45 psi, and are in good
condition. Correct any deficiencies or
(4) Visual inspection. Check the entire
report them to the proper authority.
pump assembly visually, checking
for broken or damaged parts, for
28. Maintenance and Safety Precautions
loose or missing mountings and as-
a. Report and correct any mechanical defi-
sembly nuts and bolts, and for signs
ciencies that may result in damage to the equip-
ment if operation is continued.
f. After-operation services. To insure that
b. Always stop the engine before making re-
the equipment is ready to operate at any time,
pairs or adjustments on any part of the pump.
the following services must be performed by
c. After starting the engine, allow it to warm
the operator or crew immediately after any op-
up at 1000 rpm and then increase speed to 1500
crating period of 8 hours or less, All defi-
rpm for a few minutes.
ciencies should be corrected and reported to the
d. Make sure that fuel and oil containers are
(1) Fuel. Check fuel supply in tank. Re-
e. Always provide a metallic contact between
fill if necessary.
container and tank when adding gasoline.
f. Always run engine at idling speed for a
few minutes before stopping.
g. Do not start pump until the suction
on oil gage. See lubrication order
valves have been closed and the pump filled
with the liquid that is to be pumped.
(3) Clean equipment. With an approved
h. Stop the pump immediately if unusual
cleaning solvent, remove all dirt and
noises or odors are noticed. Do not continue
grease from the engine, housing parts,
operations until causes have been discovered
frame, and towing tongue. Remove
all dirt and mud from the wheels,
wheel hubs, axle, and springs, espe-
29. Organizational Maintenance
cially if freezing temperatures prevail.
a. Preventive maintenance is performed by
(4) Air cleaner. Remove the bowl from
organizational maintenance personnel at quar-
the air cleaner and fill with the same
terly intervals. The quarterly interval is equiv-
grade of lubricant as used in the
alent to 3 calendar months or 250 hours of
crankcase (see par. 29b).
operation, whichever occurs first.
b. The preventive maintenance services to be
(5) Pump strainer. Examine the pump
performed at these regular intervals are listed
strainer in the suction manifold and
and described below.
clean it if necessary.