Injection Nozzle - Nanni 5.280HE Workshop Manual

03-M Series, WSM
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 (1) jetted with the proper injection
pressure to the injection pump pressure tester (2). (Refer to the
figure.)
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 pump
Allowable limit
element
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 Nozzle

(2) Injection Pump Pressure Tester
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 (1) jetted with the proper injection
pressure to the injection pump pressure tester (2).
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
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
2
, from 1991 to 1849 psi).
to 130 kgf/cm
8. Measure the time needed to decrease the pressure from 13.73 to
12.75 MPa (140 to 130 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.
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 Nozzle
(2) Injection Pump Pressure Tester
S-96
DIESEL ENGINE
13.73 MPa
2
140 kgf/cm
1991 psi
(3) Protection Cover for Jetted Fuel
W1017430
2
, 1991 psi).
2
, 1991 to 1849 psi).
10 seconds
13.73 → 12.75 MPa
2
140 → 130 kgf/cm
1991 → 1849 psi
5 seconds
13.73 → 12.75 MPa
2
140 → 130 kgf/cm
1991 → 1849 psi
(3) Protection Cover for Jetted Fuel
W1017786
KiSC issued 08, 2012 A