Kubota 07-CR-E5 - Page 190

COMMON RAIL SYSTEM
07-CR-E5,07-CR-TE5,07-CR-TIE5, DM
1-S152
1. Check the Data Related to the Rail Pressure
1. Connect the diagnosis tool to the CAN1 connector, and select
the "Actual rail pressure" and "Target rail pressure" on the data
monitor.
2. Observe the data signals by operating the accelerator pedal and
others and by performing the actual run test.
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2. Check the Fuel System for the Existence of Air
1. Check each joint of the fuel system for the existence of air.
To detect the existence of air effectively, replace the fuel hose
with a transparent one.
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3. Check the Fuel System
CAUTION
• Visually check there is no leak in the high pressure fuel
pipe system.
• A visual check is not possible if a leak (high pressure
system) occurs inside the head cover, so check that the oil
level has not increased.
1. Check in accordance with "6.[2] FUEL SYSTEM INSPECTION
PROCEDURE". (Refer to page 1-S321)
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Service
specification
The "Actual rail pressure" always follow to the "Target rail
pressure"
1. When idling:
40 to 50 MPa (410 to 500 kgf/cm
2
, 5800 to 7200 psi)
2. Accelerator opening 0 → 100 % (During acceleration):
Maximum value 95.0 to 130 MPa (969 to 1320 kgf/cm
2
,
13800 to 18800 psi)
3. No-load maximum speed:
95.0 to 115 MPa (969 to 1170 kgf/cm
2
, 13800 to
16600 psi)
4. The numerical value is stable under normal operating and
the target value corresponds with actual pressure value.
OK Use all of the available information and try to reproduce the problem by
operating the accelerator pedal in different ways and by changing the
environmental conditions.
NG Go to "2. Check the Fuel System for the Existence of Air".
(a) CAN1 Connector
OK Go to "3. Check the Fuel System".
NG
Rotate the fuel feed pump sufficiently and bleed the air.
Locate the position of the fuel leakage in the piping and repair it.
(1) Fuel Hose
OK Go to "4. Check the Rail Pressure Sensor".
NG Repair in accordance with "6.[2] FUEL SYSTEM INSPECTION
PROCEDURE". (Refer to page 1-S321)
(1) Rail
(2) Supply Pump
(3) Dipstick
KiSC issued 03, 2022 A