Komatsu 114E-3 Series Shop Manual page 231

40 Troubleshooting
4 Defective supply pump
Possible causes
and standard
5 Defective pressure limiter
value in normal
state
Defects in supply pump
6
plunger
7 Air in low-pressure circuit
114E-3 Series
Causes
a For testing of return rate from supply pump, see Testing and
adjusting, "Testing leakage from pressure limiter and return rate
from injector."
Return rate from supply
a For testing of leakage from pressure limiter, see Testing and
adjusting, "Testing leakage from pressure limiter and return rate
from injector."
Leakage from pressure
a Remove supply pump head, and inspect plunger for damage
directly.
Inspect it for air entry directly according to the following procedure.
1) Remove pressure pickup plug (outlet side) from fuel main filter.
2) Operate feed pump of fuel pre-fuel filter.
3) Inspect fuel and air from pressure pickup plug for leakage level.
• If this error occurs during bleeding air after replacement of the fuel
filter, air left in the fuel circuit is suspected. Continue engine oper-
ation at low idle approximately 3 minutes. When air is bled from
the fuel circuit, engine speed becomes stable and the error indi-
cation disappears.
Standard value in normal state/Remarks on troubleshooting
Cranking (When
engine cannot be
pump
At low idle (When
engine can be
limiter
SEN00460-01
Max. 200 cc/
30 sec.
started)
Max. 300 cc/
30 sec.
started)
Below 30 drops/
At low idle
60 sec.
31