Kubota B1830, Workshop Manual

Page: 119 / 548

ENGINE B1830,B2230,B2530,B3030, WSM
1-S18
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
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 (from 140 to 130 kgf/cm
2
, from 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
• Never try to disassemble the injection pump assembly. For
repairs, you are strongly requested to contact a
Kubota-authorized pump service shop.
9Y1210003ENS0018US0
Nozzle Spraying Condition
CAUTION
• Check the injection pressure and condition after
confirming that there is nobody standing in the direction
the fume goes.
• If the fume from the nozzle directly injects the human body,
cells may be destroyed and blood poisoning may be
caused.
1. Set the injection nozzle to a nozzle tester, and check the nozzle
spraying condition.
2. If the spraying condition is defective, replace the nozzle piece.
9Y1210003ENS0019US0
Fuel tightness of delivery
valve
Factory specification
10 seconds
13.73
→ 12.75 MPa
140 → 130 kgf/cm
2
1991 → 1849 psi
Allowable limit
5 seconds
13.73
→ 12.75 MPa
140 → 130 kgf/cm
2
1991 → 1849 psi
(1) Injection Nozzle
(2) Injection Pump Pressure Tester (3) Protection Cover for Jetted Fuel
(a) Good (b) Bad
KiSC issued 05, 2012 A