Kubota WG972-E4 Operator's Manual page 40

28 TROUBLESHOOTING
B When engine speed is insufficient
Cause
Improper or defective spark plug
Defective ignition coil
Defective throttle body
Breather tube has separated.
Improper input signal to ECU
Disconnection
B When engine suddenly stops
Cause
Lack of fuel
Moving parts are overheated due to
shortage of lubrication oil or improper
lubrication.
Clogged air cleaner
Disconnection
B When excessive black exhaust gas is observed
Cause
Fuel system is bad.
Fuel is extremely poor quality.
B When white exhaust gas is observed
Cause
Excessive engine oil
Piston ring and liner worn or stuck
Defective valve stem seal
B When lubricant oil consumption is excessive
Cause
Oil leaking from oil seal, gasket, etc.
Defective valve stem seal
Piston ring and liner worn or stuck
* Clean or replace.
* Replace.
* Replace.
* Attach correctly.
* Check the wire harness.
* Check the wire harness.
* Check the fuel tank and refill the fuel, if necessary.
* Also check the fuel system for air or leaks.
* Check amount of engine oil with oil level gauge.
* Check lubricating oil system.
* Replace oil filter cartridge.
* Clean or replace.
* Check the wire harness.
* Check the fuel system.
* Replace fuel.
* Reduce to specified level.
* Replace.
* Replace.
* Replace.
* Replace.
* Replace.
Countermeasures
Countermeasures
Countermeasures
Countermeasures
Countermeasures