Kubota GR1600EU Workshop Manual page 103

GR1600EU, WSM
CAUTION
• Check the injection pressure and condition after you make sure that there is nobody standing in the
direction the fume goes.
• If the fume from the nozzle directly contacts the human body, cells may be destroyed and blood
poisoning may be caused.
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 hand and raise the pressure to
approx. 13.7 MPa (140 kgf/cm
7. Now turn the flywheel back about half a turn (to keep the plunger
free). Keep the flywheel at this position and clock the time taken
for the pressure to drop from 13.7 to 12.8 MPa (from 140 to 130
2
kgf/cm , from 1990 to 1850 psi).
8. Measure the time needed to decrease the pressure from 13.7 to
12.8 MPa (from 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 specification
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
Nozzle Spraying Condition
1. Set the injection
No. 07909-31361), and check the nozzle spraying condition.
2. If the spraying condition is damaged, replace the nozzle piece.
(a) Good
1-S17
2
, 1990 psi).
2
, 1990 to 1850 psi).
10 seconds
13.7 → 12.8 MPa
140 → 130 kgf/cm
1990 → 1850 psi
5 seconds
13.7 → 12.8 MPa
140 → 130 kgf/cm
1990 → 1850 psi
(3) Protection Cover for Jetted Fuel
9Y1210595ENS0093US0
9Y1210595ENS0094US0
nozzle to a nozzle
(b) Bad
9Y1210595ENS0018US0
KiSC issued 11, 2013 A
ENGINE
2
2
tester (Code