05-E2B, 05-E2BG, WSM G GENERAL Checking Injection Pump (Fuel Tightness of Pump Element) 1. Remove the engine stop solenoid. 2. Remove the injection pipes and glow plugs. 3. Install the injection pump pressure tester to the injection pump. 4. Install the injection nozzle (2) jetted with the proper injection pressure to the injection pump pressure tester (1). (Refer to the photo.) 5. Set the speed control lever to the maximum speed position. 6. Run the starter to increase the pressure. 7. If the pressure can not reach the allowable limit, replace the pump with new one or repair with a Kubota-authorized pump service shop. (Fuel Tightness of Delivery Valve) 1. Remove the engine stop solenoid. 2.
Remove the injection pipes and glow plugs. 3. Set a pressure tester to the fuel injection pump. 4. Install the injection nozzle (2) jetted with the proper injection pressure to the injection pump pressure tester (1). 5. Run the starter to increase the pressure. 6. Stop the starter when the fuel jets from the injection nozzle. After that, turn the flywheel by the hand and raise the pressure to approx. 13.73 MPa (140 kgf/cm 2 , 1991 psi). 7. Now turn the flywheel back about half a turn (to keep the plunger free). Maintain the flywheel at this position and clock the time taken for the pressure to drop from 13.73 to 12.75 MPa (from 140 to 130 kgf/cm 2 , from 1991 to 1849 psi). 8.
Measure the time needed to decrease the pressure from 13.73 to 12.75 MPa (140 to 130 kgf/cm 2 , 1991 to 1849 psi). 9. If the measurement is less than allowable limit, replace the pump with new one or repair with a Kubota-authorized pump service shop. NOTE Q Never try to disassemble the injection pump assembly. For repairs, you are strongly requested to contact a Kubota- authorized pump service shop. (1) Injection Pump Pressure Tester (2) Injection Nozzle (3) Protection Cover for Jetted Fuel W1022357 G-23 KiSC issued 06, 2011 A Fuel tightness of pump element Allowable limit 13.73 MPa 140 kgf/cm2 1991 psi Fuel tightness of delivery valve Factory spec.
10 seconds 13.73 → 12.75 MPa 140 → 130 kgf/cm2 1991 → 1849 psi Allowable limit 5 seconds 13.73 → 12.75 MPa 140 → 130 kgf/cm2 1991 → 1849 psi