Table 11-2. Operator's Troubleshooting Chart - Liquid Loading System.
Malfunction
Probable cause
Corrective action
a.
a.
1. Engine will not start.
Ignition switch not at ON position.
Place ignition switch to ON position.
b.
b.
Low fuel level.
Fill tank with fresh fuel/oil mixture.
c.
c.
Choke or throttle not set properly.
Adjust choke or throttle as required.
d.
d.
Loosen cap or clean vent.
Gas cap vent plugged.
e.
Vacuum in gas tank.
e.
Loosen cap.
a.
a.
2. Engine not running properly.
Low fuel level.
Fill tank with fresh fuel/oil mixture.
b.
b.
Gas cap vent plugged.
Loosen cap or clean vent.
c.
Air filter dirty.
c.
Clean air filter.
d.
d.
Choked engine.
Push choke in.
3. Pump not pumping.
a. Pump not primed.
a. Fill pump with water.
b. Loose intake line connections.
b. Tighten intake line connections.
c. Pump plugged with contaminant.
c. Stop engine; drain pump and fill with clear, clean
water.
d. Inlet strainer clogged.
d. Clean strainer.
e. Open inlet valve.
e. Input valve closed (handle across tube).
f. Supply fluid depleted.
f. Change supply drums.
g. Pump defective.
g. Refer to organizational maintenance level.
e. Throttle Rod Friction. If throttle rod (28, fig. 11-
(2) Clean the air cleaner element as follows
19) slips or "walks" during engine operation, tighten as
(a) Loosen captive nut (1) and remove
follows:
air cleaner element cover (2). Do not remove nut from
(1) Position ignition switch at OFF to stop
cover.
engine.
(2) Tighten two screws (34) as required to
CAUTION
increase friction of throttle rod clamp (29).
Use care not to allow loose dirt or
(3) Resume normal operation.
dust particles to fall into carburetor
f.
Pump Priming. Since the fluid being pumped
chamber.
lubricates the pump and keeps it cool, make sure the
(b) Before removing air cleaner element
pump contains water or the pumped fluid at all times
(3), remove all loose dirt or dust particles. Then remove
while running. Refer to paragraph 2-1, step b (5) for
air cleaner element.
pump priming procedure.
(c) Slosh the element in clean solvent
g. Inlet Strainer, Hoses, and Couplings.
(not fuel mix), and dry thoroughly before use. If cleaning
WARNING
with solvent is not possible, clean the element by tapping
Insecticide
spray
fluids
are
against a flat surface or by blowing out dust or dirt with
poisonous and should be handled
an air hose.
(d) Replace element after 100 hours of
with care. Avoid splashing fluid or
operation or when it appears clogged and cleaning will
prolonged contact or breathing of
not restore engine power.
fumes. Wash hands before smoking
(e) Install air cleaner element, and
or
eating,
after
contact
with
secure in position with air cleaner element cover and
insecticide fluid.
captive nut.
Prior to operating the equipment, inspect the inlet
c. Fuel Line. Inspect the fuel line (5 fig. 11-2)
strainer, hoses, and couplings for condition and
prior to use, and while engine is running. Observe for
serviceability.
fuel leakage caused by cracked hose or loose
(1) Strainer. Loosen the screw assembly (2,
connections. Stop pump right away if a leak occurs.
Secure loose connections prior to restarting.
(5), and screen (6). Clean the screen by sloshing in
d. Fuel Mixture and Level. Check fuel level prior
clean, running water. Inspect the O-ring, and replace if
to starting pump engine, and fill upon completion of
defective.
operations to prevent moisture condensation in fuel tank.
(2) Hoses. Inspect the hose assemblies for
breaks, cracks, or loose connections. Replace any hose
that proper fuel mixture is used to prevent engine
assembly found to be defective.
malfunctions.
11-6
