Komatsu PC1250-11 Original Instructions Manual page 426

HANDLE AUTO-GREASING SYSTEM
NOTICE
Grease pressure does not rise to the specified pressure, or it takes longer to reach the specified pres-
sure, then the injector does not operate correctly.
Check item
• Loosen the plug which is attached to the injector in order to bleed air from the main piping. Perform the
work by two workers.
• Perform bleeding of the air from the nearest injector to the grease pump in order.
(Swing circle → boom cylinder bottom → boom → arm)
• Check that the auto-greasing and grease gun selector valve lever in the battery relay case is on the auto-
greasing side.
METHOD FOR BLEEDING AIR
1.
Remove the plug (2) of the injector (1).
The plug (2) is attached to the manifold end of each termi-
nal injector. Remove the plug (2) to bleed air if air bleeding
is needed for the main piping.
2.
The greasing mode selector switch is in the box next to the
right console in the operator's cab. Another worker turn it
to manual position to actuate the grease pump.
For operating the grease pump, see "MACHINE OPERA-
TIONS AND CONTROLS".
3.
Grease which is mixed air is discharged through the plug
hole of the injector. (It is often cloudy due to the mixed air.)
4.
Stop the grease pump by turning the greasing mode selector switch to AUTO position when normal grease
comes out.
5.
Tighten the plug (2) to the injector so that grease does not
leak.
Allowable tightening torque of plug (2):19.6 to 29.4 Nm
{2.0 to 3.0 kgm}
Perform Steps 1. Through 5. for all injectors.
6.
Remove the cap (4) of the service grease nipple (3) in the
injector.
7.
Fill all branch lines with grease completely by manually us-
ing the grease gun.
For location of the injectors, see "GREASING POINTS
FOR AUTO-GREASING SYSTEM".
REMARK
If the auto-greasing system does not operate correctly to
lubricate, you can perform lubrication by using the grease
gun through the service grease nipple (3) which is attach-
ed to the each injector.
8.
Tighten the cap (4) of the service grease nipple (3) in the
injector.
Allowable tightening torque of cap (4):3.92 to 5.88 Nm {0.4
to 0.6 kgm}
The service nipple (3) has no counterflow prevention function. If the cap (4) is left open, highly pressurized
grease will spurt out when the grease pump operates, and it is dangerous. Be sure to tighten it.
9.
The auto-greasing switch is in the box next to the right console in the operator's cab. Turn it to auto-greas-
ing position after the work of Step 1. through 8. Is finished.
6-20
ATTACHMENTS AND OPTIONS