Use and Care Manual

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14 of 16 Rev. 1/2010
Heavy Duty Power Equipment
4550 Pro, 5650, 6500(EL), 7550 Pro
Troubleshooting
Heavy Duty Power Equipment
Symptom: No spark, engine not catching, engine won't start
Potential Causes Check / solution Recommendation
Fuel valve off/out of fuel Fill tank/turn fuel valve on
Spark arrestor clogged Remove, clean and replace.
Choke is open Close choke by pulling choke wire out. Open choke after starting
Vacuum check valve has failed Replace check valve Call DEK for parts/service
On/Off switch broken Use fuel shut-off as ON/OFF switch until switch is replaced. Call DEK for parts/service
Oil level too low The engine shuts down when oil level low
Oil switch Verify oil switch/sensor is functioning . The oil switch is the gold, brass colored box about 3 inches to the
left of the oil fill cap. Dis-connect oil switch by disconnecting black lead out of finger connection. If the
engine starts, then switch/sensor is faulty or the oil level is too low, if engine still does not start, then
switch/sensor is probably ok to reassemble
Call DEK for parts/service
Recoil is broken If ratchets are broken they will not spin the engine. Call DEK for parts/service
Fuel filter is dirty Contaminates will clog filter, not allowing fuel to get to engine. Clean or replace fuel filter.
Fuel is contaminated Contaminates in fuel will not allow combustion at the specified pressure and temperate and blocks filters
Spark plug boot off/loose Press spark plug boot firmly on spark plug. Call DEK for parts/service
Ignition coil failure Call DEK for parts/service
Spark plug fouled or failed Remove spark plug, clean or replace Call DEK for parts/service
Carburator clogged Clean with fresh fuel Call DEK for parts/service
Symptom: Recoil is hard to pull or not retracting
Potential Causes Check / solution Recommendation
Spark arrestor Remove, clean and replace.
Recoil rubbing on dented housing Call DEK for parts/service
Alternator bearing failed Alternator bearing needs to be replaced. Send to service. Call DEK for parts/service
Camshaft detent has failed Call DEK for parts/service
Head valve timing is off Call DEK for parts/service
Symptom: Engine starts, but then shuts off before 10 seconds
Potential Causes Check / solution Recommendation
Remove/Clean spark arrestor Remove, clean and replace.
Oil level too low The engine shuts down when the oil level is low. Check the owners manual for oil capacity
Fuel valve off/out of fuel Fill tank/turn fuel valve on
Spark plug fouled or failed Remove spark plug, clean or replace Call DEK for parts/service
Vacuum check valve has failed Replace check valve, call DEK for replacement procedure. Call DEK for parts/service
Symptom: Choke wire broke
Potential Causes Check / solution Recommendation
Choke broke Choke should be closed while starting. Pull black choke counter-clockwise and hold in place with wire.
Release after starting.
Call DEK for parts/service
Symptom: Engine runs: rough/vibrating/oscillating
Potential Causes Check / solution Recommendation
Remove/Clean spark arrestor Remove, clean and replace.
The choke is not open Push choke lever in.
Over loading generator Disconnect some appliances
Air filter is dirty Clean air filter
Fuel filter is clogged Contaminates will clog filter, not allowing fuel to get to engine. Clean filter
Fuel is contaminated Contaminates in fuel will not allow combustion at the specified pressure and temperate
Vacuum check valve has failed Replace check valve. Call DEK for parts/service
Head valve timing is off Send to service Call DEK for parts/service
Symptom: Engine runs, but boggs down under load
Potential Causes Check / solution Recommendation
Remove/Clean spark arrestor Remove, clean and replace.
Choke is open Push choke lever in
Over loading generator Disconnect some appliances / devices
Air filter is dirty Clean air filter
Fuel filter is clogged Contaminates will clog filter, not allowing fuel to get to engine
Symptom: Engine runs, Volt meter shows 120 VAC, but no power to outlets
Potential Causes Check / solution Recommendation
Bad extension cord/power strip Try different / shorter extension cord or a different power strip
Push button breaker tripped Disconnect all loads and push reset button.
GFCI tripped Disconnect all loads. Push the red reset button very deep/firmly
GFCI failed Replace GFCI with any GFCI or household outlet Call DEK for parts/service