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.MAINTENANCE PROCEDURE
BLEEDING AIR FROM HYDRAULIC SYSTEM
For details, see "STARTING ENGINE ( 3-77 )". If it is necessary to refer to the items for starting the engine, mov-
ing the machine off, steering, or stopping, see the OPERATION section.
1. Bleeding air from pump
1) Loosen air bleed plug (1) and check that oil oozes out
from the air bleeder.
2) If the oil does not ooze out, remove the drain hose from
the hydraulic pump case and fill the pump case com-
pletely with hydraulic oil through drain port (2).
Hold the removed hose firmly, keeping the mouthpiece
higher than the oil level in the hydraulic tank so that oil
will not spill out of the hose.
3) After completing the air bleed operation, tighten air bleed
plug (1) and install the drain hose.
NOTICE
If the drain hose is installed first, oil will spurt out from plug hole (1).
If the pump is operated without filling the pump case with hydraulic oil, abnormal heat will be generated
and this may cause an unexpected damage to the pump.
2. Starting engine
Start the engine, referring to "STARTING ENGINE ( 3-77 )".
Run the engine at low idling for 10 minutes after starting, then start operations.
3. Bleeding air from cylinders
1) Run the engine at low idling, and extend and retract each cylinder 4 to 5 times, taking care so that a cylinder
may not be brought up to its stroke end. (Stop the cylinder approx. 100 mm (3.9 inches) short of its stroke
end)
2) Next, operate each cylinder 3 to 4 times to the end of its stroke.
3) Finally, operate each cylinder 4 to 5 times to the end of its stroke to completely remove the air.
NOTICE
If the engine is run at high speed immediately after startup or a cylinder is pushed up to its stroke end, air
taken inside the cylinder may cause damage to the piston packing.
4. Bleeding air from swing motor
1) Run the engine at low idling, loosen hose (1) at port S,
and check that oil oozes out from port S hose (1).
NOTICE
Do not operate the swing under any circumstances.
2) If oil does not ooze out, stop the engine, remove port S hose (1), and fill the inside of the motor case with
hydraulic oil.
3) After completely bleeding the air, tighten port S hose (1).
4) Run the engine at low idling and slowly swing at least two times uniformly to the left and right. This will auto-
matically bleed the air.
NOTICE
If the air is not bled from the swing motor, the motor bearings may be damaged.
When replacing the travel motor safety valve, please contact your Komatsu distributor to have it
replaced and to have the air bled.
4-36
MAINTENANCE
0.
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