MQ Power WBH16 troubleshooting: 79 symptom-cause-remedy entries from the manufacturer's own service documentation.
MQ Power WBH16 — full specs, parts & maintenance.
| Symptom | Cause | Remedy |
|---|---|---|
| Loss of Power | Speed control cable out of adjustment | Adjust speed control cable; Replace cable if necessary |
| Loss of Power | Hydraulic oil level low | Check hydraulic oil level; Add oil if necessary |
| Loss of Power | Contaminated hydraulic oil filter | Replace hydraulic oil filter |
| Loss of Power | Low engine RPM | Check engine speed |
| Loss of Travel | Forward/Reverse lever in neutral position | Place lever in either forward or reverse position; Check hydraulic motors |
| Loss of Travel | Parking brake partially engaged | Release parking brake |
| System Operating Hot | Hydraulic oil level low | Check hydraulic oil level; add hydraulic oil if necessary |
| System Operating Hot | Defective cooling fan | Inspect cooling fan, replace if necessary |
| Slow Dumping | Low engine speed | Check engine speed; Adjust engine speed if necessary |
| Slow Dumping | Dump cylinder is internally bypassing oil | Replace dump cylinder |
| System jerky when started | Speed cable out of adjustment | Adjust speed control cable |
| System jerky when started | Defective drive motors | Check drive motors, replace if necessary |
| Parking brake will not hold | Brake linkage out of adjustment | Use smaller diameter hose or replace hose |
| Engine will not start | Low on fuel or fuel tank empty | Add fuel |
| Engine will not start | Defective kill switch | Check kill switch; Replace if necessary |
| Engine will not start | Engine ON/OFF switch in OFF position | Set engine ON/OFF switch to ON position |
| Engine will not start | Fuel Shut-off valve CLOSED | Open Fuel shut-off valve |
| Difficult to start, fuel is available, but no spark at spark plug | Spark plug bridging | Check gap, insulation or replace spark plug |
| Difficult to start, fuel is available, but no spark at spark plug | Carbon deposit on spark plug | Clean or replace spark plug |
| Difficult to start, fuel is available, but no spark at spark plug | Short circuit due to deficient spark plug insulation | Check spark plug insulation, replace if worn |
| Difficult to start, fuel is available, but no spark at spark plug | Improper spark plug gap | Set to proper gap |
| Difficult to start, fuel is available, but no spark at spark plug | Fuel reaching carburetor | Check fuel line |
| Difficult to start, fuel is available, but no spark at spark plug | Water in fuel tank | Flush or replace fuel tank |
| Difficult to start, fuel is available, but no spark at spark plug | Fuel filter clogged | Replace fuel filter |
| Difficult to start, fuel is available, but no spark at spark plug | Stuck carburetor | Check float mechanism |
| Difficult to start, fuel is available, but no spark at spark plug | Spark plug is red | Check transistor ignition unit |
| Difficult to start, fuel is available, but no spark at spark plug | Spark plug is bluish white | If insufficient compression, repair or replace engine; If injected air leaking, correct leak; If carburetor jets clogged, clean carburetor |
| Difficult to start, fuel is available, but no spark at spark plug | No spark present at tip of spark plug | Check transistor ignition unit is broken, and replace defective unit; Check if voltage cord cracked or broken and replace; Check if spark plug if fouled and replace |
| Difficult to start, fuel is available, but no spark at spark plug | No oil | Add oil as required |
| Difficult to start, fuel is available, but no spark at spark plug | Oil pressure alarm lamp blinks upon starting (if applicable) | Check automatic shutdown circuit, "oil sensor" (if applicable) |
| Difficult to start, fuel is available, and spark is present at the spark plug | ON/OFF switch is shorted | Check switch wiring, replace switch |
| Difficult to start, fuel is available, and spark is present at the spark plug | Ignition coil defective | Replace ignition coil |
| Difficult to start, fuel is available, and spark is present at the spark plug | Improper spark gap, points dirty | Set correct spark gap and clean points |
| Difficult to start, fuel is available, and spark is present at the spark plug | Condenser insulation worn or short circuiting | Replace condenser |
| Difficult to start, fuel is available, and spark is present at the spark plug | Spark plug wire broken or short circuiting | Replace defective spark plug wiring |
| Difficult to start, fuel is available, spark is present and compression is normal | Wrong fuel type | Flush fuel system, and replace with correct type of fuel |
| Difficult to start, fuel is available, spark is present and compression is normal | Water or dust in fuel system | Flush fuel system |
| Difficult to start, fuel is available, spark is present and compression is normal | Air cleaner dirty | Clean or replace air cleaner |
| Difficult to start, fuel is available, spark is present and compression is normal | Choke open | Close choke |
| Difficult to start, fuel is available, spark is present and compression is low | Suction/exhaust valve stuck or protruded | Reseat valves |
| Difficult to start, fuel is available, spark is present and compression is low | Piston ring and/or cylinder worn | Replace piston rings and/or piston |
| Difficult to start, fuel is available, spark is present and compression is low | Cylinder head and/or spark plug not tightened properly | Torque cylinder head bolts and spark plug |
| Difficult to start, fuel is available, spark is present and compression is low | Head gasket and/or spark plug gasket damaged | Replace head and spark plug gaskets |
| No fuel present at carburetor | No fuel in fuel tank | Fill with correct type of fuel |
| No fuel present at carburetor | Fuel cock does not open properly | Apply lubricant to loosen fuel cock lever, replace if necessary |
| No fuel present at carburetor | Fuel filter/lines clogged | Replace fuel filter |
| No fuel present at carburetor | Fuel tank cap breather hole clogged | Clean or replace fuel tank cap |
| No fuel present at carburetor | Air in fuel line | Bleed fuel line |
| Weak in power, compression is proper and does not misfire | Air cleaner dirty | Clean or replace air cleaner |
| Weak in power, compression is proper and does not misfire | Improper level in carburetor | Check float adjustment, rebuild carburetor |
| Weak in power, compression is proper and does not misfire | Defective spark plug | Clean or replace spark plug |
| Weak in power, compression is proper and does not misfire | Improper spark plug | Set to proper gap |
| Weak in power, compression is proper but misfires | Water in fuel system | Flush fuel system and replace with correct type of fuel |
| Weak in power, compression is proper but misfires | Dirty spark plug | Clean or replace spark plug |
| Weak in power, compression is proper but misfires | Ignition coil defective | Replace ignition coil |
| Engine overheats | Spark plug heat value incorrect | Replace with correct type of spark plug |
| Engine overheats | Wrong type of fuel | Replace with correct type of fuel |
| Engine overheats | Cooling fins dirty | Clean cooling fins |
| Engine overheats | Intake air restricted | Clear intake of dirt and debris; Replace air cleaner elements as necessary |
| Engine overheats | Oil level too low or too high | Adjust oil to proper level |
| Rotational speed fluctuates | Governor adjusted incorrectly | Adjust governor |
| Rotational speed fluctuates | Governor spring defective | Replace governor spring |
| Rotational speed fluctuates | Fuel flow restricted | Check entire fuel system for leaks or clogs |
| Recoil starter malfunctions (if applicable) | Recoil mechanism clogged with dust and dirt | Clean recoil assembly with soap and water |
| Recoil starter malfunctions (if applicable) | Spiral spring loose | Replace spiral spring |
| Starter malfunctions | Loose, damaged wiring | Ensure tight, clean connections on battery and starter |
| Starter malfunctions | Battery insufficiently charged | Recharge or replace battery |
| Starter malfunctions | Starter damaged or internally shorted | Replace starter |
| Burns too much fuel | Over-accumulation of exhaust products | Check and clean valves; Check muffler and replace if necessary |
| Burns too much fuel | Wrong spark plug | Replace spark plug with manufacturer's suggested type |
| Exhaust color is continuously "white" | Lubricating oil is wrong viscosity | Replace lubricating oil with correct viscosity |
| Exhaust color is continuously "white" | Worn rings | Replace rings |
| Exhaust color is continuously "black" | Air cleaner clogged | Clean or replace air cleaner |
| Exhaust color is continuously "black" | Choke valve set to incorrect position | Adjust choke valve to correct position |
| Exhaust color is continuously "black" | Carburetor defective, seal on carburetor broken | Replace carburetor or seal |
| Exhaust color is continuously "black" | Poor carburetor adjustment, engine runs too rich | Adjust carburetor |
| Will not start, no power with key "ON" (if applicable) | ON/OFF device not activated ON | Turn on/OFF device |
| Will not start, no power with key "ON" (if applicable) | Battery disconnected or discharged | Check cable connections; Charge or replace battery |
| Will not start, no power with key "ON" (if applicable) | Ignition switch/wiring defective | Replace ignition switch; Check wiring |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: Spark plug bridging; Carbon deposit on spark plug; Short circuit due to deficient spark plug insulation; Improper spark plug gap. See the table for the matching fixes.
Documented causes: ON/OFF switch is shorted; Ignition coil defective; Improper spark gap, points dirty; Condenser insulation worn or short circuiting. See the table for the matching fixes.
Documented causes: No fuel in fuel tank; Fuel cock does not open properly; Fuel filter/lines clogged; Fuel tank cap breather hole clogged. See the table for the matching fixes.