Handling Of Fuel System Equipment; Remaining Pressure Relief From Fuel System Equipment - Komatsu Galeo PC800-8 Shop Manual

SEN00786-02
Handling of fuel system
equipment
a Precautions in Inspection and Maintenance of
Fuel System Equipment
The common rail type fuel injection system
(CRI) is composed of more precise components
than the usual fuel injection pump and nozzle
and will probably get out of order when foreign
matters enters the system.
During inspection and maintenance of the fuel
system, pay more attention to foreign matters
than in case of usual fuel injection pumps and
wash the system carefully with clean fuel if dusts
enter the system.
a Precautions in Replacement of Fuel Filter Car-
tridge
Be sure to use genuine fuel filter cartridge of
Komatsu.
The common rail type fuel injection system
(CRI) is composed of more precise components
than the usual fuel injection pump and nozzle
and is equipped with special filter with highly
efficient filtration performance to prevent foreign
matters from entering the system.
Therefore, be sure to use genuine filters only.
Otherwise, the fuel system will possibly get out
of order.
14
Remaining pressure relief
from fuel system equipment
a While the engine is rotating, pressures occur in
the low pressure circuit and the high pressure
circuit of the fuel system.
Low pressure circuit : Among Feed pump – Fuel
filter – Fuel supply pump
High pressure circuit : Among Fuel supply pump –
Common rail – Fuel injector
a When 30 seconds elapse after the engine
stopped, pressures in both the low pressure cir-
cuit and the high pressure circuit drop to the
safe level automatically.
a Since pressure remaining in the fuel system
should be relieved certainly before inspection of
the fuel system and mounting and removing of
equipment, be sure to observe the following pre-
k Inspect the fuel system or mount or remove
cautions:
equipment more than 30 seconds later after the
engine stopped and after pressure remaining in
the fuel system is relieved. (Pressure remains in
the fuel system right after the engine stopped,
so do not start any work until 30 seconds
elapse.)
30 Testing and adjusting
PC800, 850-8