Komatsu HD785-5, Руководство по эксплуатации и техническому обслуживанию

Страница: 220 / 307

.
MAINTENANCE
SERVICE PROCEDURE
REPLACE FUEL FILTER CARTRIDGE
WARNING
Each part is at high temperature after the engine has been operated, so never change the filter immediately after finishing
operations. Wait for each part to cool down before changing it.
Do not bring fire or sparks near the fuel.
Prepare a filter wrench
1. Close supply valve (1) of the fuel tank.
2. Set the container to catch the fuel under the filter cartridge.
3. Using a filter wrench, turn filter cartridge (2) counterclockwise
to remove it.
4. Clean the filter holder, fill a new filter cartridge with clean fuel,
coat the packing surface with engine oil, then install it to the
filter holder.
5. When installing, tighten until the packing surface contacts the
seal surface of the filter holder, then tighten a further 1/2 to
3/4 turns.
If the filter cartridge is tightened too far, the packing will be
damaged and this will lead to leakage of fuel. If the filter is too
loose, fuel will also leak from the packing, so always tighten the
correct amount.
6. After replacing filter cartridge (2), loosen air bleed plug (3), and
open supply valve (1).
7. Loosen knob (4) (one each on left and right) of the feed pump,
and move it up and down to make the fuel overflow until no
more bubbles come out from air bleed plug (3).
8. Tighten air bleed plug (3), then push in knob (4) (one each on
left and right) of the feed pump, and tighten it.
9. After replacing the filter cartridge, start the engine and check
that there is no leakage of fuel from the filter seal surface. If
there is any leakage of fuel, check the tightening of the filter
cartridge. If there is still leakage of fuel, follow Step 2 and 3 to
remove the filter cartridge, then check the packing surface for
damage or foreign material. If any damage or foreign material
is found in the packing, replace the cartridge with a new part,
then repeat Steps 4 to 9 to install the filter cartridge.
When the engine is started after stopping because fuel is used up, if misfirming or black exhaust emission occur,
bleed air from the fuel line according to the following procedure.
10. Loosen the air bleed plugs of both injection pumps, bleed air by operating both feed pumps as explained in Steps
6 - 8 above.
Be sure to use both priming pumps to bleed air.
If any air remains in the fuel line, it can cause a problem in the fuel system.
4 - 55