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Section III. TROUBLESHOOTING - TM-5-4320-234-120026
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TM-5-4320-234-12 Pump Centrifugal Self-Priming Gasoline Engine Driven Wheel Mounted 6-Inch 1500 GPM Capacity At 60 Foot Head Manual
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Section IV. MAINTENANCE PROCEDURES - TM-5-4320-234-120028
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ENGINE-Continued
Step 6. Check overspeed governor reset.
Push reset button on top of overspeed governor. Restart and watch tachometer. If engine speed rises
above 2700 rpm, report to organizational maintenance.
4. ENGINE RUNS BUT CONTINUALLY MISFIRES.
Step 1. Check for water in fuel.
Drain fuel tank and lines. Refill with fresh fuel.
Step 2. Check for clogged fuel strainer.
a. Close the shutoff valve on the fuel strainer.
b. Loosen the bail nut and swing the bail aside and remove the glass bowl and gasket.
Empty the contents of the bowl and wipe it dry with a clean cloth.
Step 3. If engine continues to misfire, report problem to organizational maintenance.
5. ENGINE OVERHEATS.
Step 1. Check radiator water level.
If low, fill radiator to proper level.
Step 2. Check for broken or worn fan belt.
Report damaged fan belt to organizational maintenance.
Step 3. Check for broken radiator hoses.
Report broken hoses to organizational maintenance.
Step 4. Check oil level.
If oil level is low, fill to the proper level with recommended oil.
Step 5. Check that radiator stone shield is open and that radiator is clear of foreign matter.
Remove foreign matter from radiator. Make sure that stone shield is open before operating engine.
6. ENGINE RUNS BUT LACKS POWER.
Step 1. Check that throttle control is in full speed position.
If throttle control is not in full speed position, push in throttle control to provide full speed operation.
Step 2. Check that choke control is fully in when engine is warm.
Push in choke control.
Step 3. Check for restriction in air cleaner.
a. Loosen the wing belt on the clamp assembly and remove the dust cover.
b. Remove the wing nut and remove the element.
CAUTION
Do not use gasoline or other solvents for cleaning the air element.
c. To clean the element, use a 1/8 inch air nozzle with 100 psi maximum compressed air, blowing
from the inside toward the outside until all dust is removed.
d. An alternate method of cleaning the element is to wash it with a nonsudsing detergent in a container
large enough to immerse the element. Allow it to soak for 10 minutes minimum and agitate it for 2
minutes to dislodge all dirt. Rinse with clean water, using water pressure from a tap with pressure of less
than 40 psi. Air dry thoroughly before reinstallation.
e. Insert a light bulb in the cleaned element and carefully check for holes, cracks, or ruptures.
Any hole in the element will necessitate element replacement.
f. Install element and secure with wing nut. Install dust cover and tighten clamp assembly wing bolt.
Step 4. Check for stuck weather cap on muffler.
Free weather cap.
Step 5. If engine continues to run, but lacks power, report problem to organizational maintenance.
PUMP ASSEMBLY
1. PUMP FAILS TO PRIME.
Step 1. Check for insufficient fluid in pump body.
Shut off engine. Remove fill plug on top of pump and fill with fluid to be pumped. Replace fill plug.
Step 2. Check for closed suction valve, if used.
Open valve.
Step 3. Check for air leak or loose fitting on suction side of pump.
Repair leak or tighten fitting.
2. PUMP FAILS TO DEVELOP HEAD.
Step 1. Check for leak in suction line.
If leak is detected, notify organizational maintenance.
Step 2. Check for low engine speed.
Operate throttle control to increase engine speed.
3-9

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