Service Manual

G-28
SM-E3B SERIES 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 hands and raise the pressure to approx.
13.73 MPa (140.0 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
140.0 to 130.0 kgf/cm
2
, from 1991 to 1849 psi).
8. Measure the time needed to decrease the pressure from 13.73 to
12.75 MPa (140.0 to 130.0 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.
NOTEQ
• Never try to disassemble the injection pump assembly. For
repairs, you are strongly requested to contact a Kubota-
authorized pump service shop.
W1022357
Fuel tightness of pump
element
Allowable limit
13.73 MPa
140.0 kgf/cm
2
1991 psi
Fuel tightness of
delivery valve
Factory spec.
10 seconds
13.73 → 12.75 MPa
140.0 → 130.0 kgf/cm
2
1991 → 1849 psi
Allowable limit
5 seconds
13.73 → 12.75 MPa
140.0 → 130.0 kgf/cm
2
1991 → 1849 psi
(1) Injection Pump Pressure Tester
(2) Injection Nozzle
(3) Protection Cover for Jetted Fuel
KiSC issued 03, 2011 A