Kubota WSM 07-E3B Series Workshop Manual page 44

07-E3B SERIES, WSM
Checking Injection Pump
(Fuel Tightness of Pump Element)
1. Remove the engine stop solenoid.
2. Remove the injection pipes.
3. Install the injection pump pressure tester (1) 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
figure.)
5. Set the speed control lever to the maximum speed position.
6. Operate 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.
3. Install 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. Operate the starter to increase the pressure.
6. Stop the starter when the fuel jets from the injection nozzle (2).
After that, turn the flywheel by the hand and raise the pressure to
approx. 18.63 MPa (190.0 kgf/cm
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 18.63 to 17.66 MPa (from
2
190.0 to 180.0 kgf/cm
8. Measure the time needed to decrease the pressure from 18.63 to
17.66 MPa (from 190.0 to 180.0 kgf/cm
9. If the measurement is less than allowable limit, replace the pump
with new one or repair with a Kubota-authorized pump service
shop.
Fuel tightness of pump
Allowable limit
element
Factory spec.
Fuel tightness of
delivery valve
Allowable limit
NOTE

• 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
G-26
2
, 2702 psi).
, from 2702 to 2561 psi).
2
, from 2702 to 2561 psi).
18.63 MPa
190.0 kgf/cm
2702 psi
10 seconds
18.63  17.66 MPa
190.0  180.0 kgf/cm
2702  2561 psi
5 seconds
18.63  17.66 MPa
190.0  180.0 kgf/cm
2702  2561 psi
(3) Protection Cover for Jetted Fuel
G GENERAL
2
2
2
W1022357
KiSC issued 06, 2020 A