. MAINTENANCE MAINTENANCE PROCEDURE NOTICE When doing this, do not operate the swing. 2) If no oil oozes out, stop the engine, remove air bleeding 4 - 41 BLEEDING AIR FROM HYDR AULIC SYSTEM For details, see "STARTING EN GINE (PAGE 3-79)". If it is necessary to refer to the ite ms for starting the e ngine, moving the machine off, steering , or stopping, see the OPERATION section. and check that oil oozes out from ve the drain hose from the pump oil through drain port (2) to fill the the drain hose is removed, so iece at a position higher than the raulic tank. bleed operation, tighten air bleed ain hose. 1. Bleeding air from pump 1) Loosen air bleed plug (1) the air bleeder.
2) If no oil oozes out, remo case, and add hydraulic pump case. Oil will come out when secure the hose mouthp level of the oil in the hyd 3) After completing the air plug (1) and install the dr 1. Bleeding air from pump 1) Loosen air bleed plug (1) and check that oil oozes out from ve the drain hose from the pump oil through drain port (2) to fill the the drain hose is removed, so iece at a position higher than the NOTICE will spurt out from plug hole (1). If the drain hose is installed first, oil If the pump is operated without fillin g the pump case with hydraulic oil, abnormal heat will be gene rated and this may ca use an unexpected damage to the pump. 2.
Starting engine "STARTING ENGINE (PAGE 3-79)". r 10 minutes after starting, then start operations. Start the engine, referring to Run the engine at low idle fo 3. Bleeding air from cylinders 1) Run the engine at low idl not moved to the end of 2) Next, operate each cylin 3) Finally, operate each cyl 1) Run the engine at low idl e, and extend and retract each cylinder 4 to 5 times, tak ing care that a cylin der is its stroke. (Stop the cylinder approx. 100 mm (3.9 in) sh ort of its stroke end 2) Next, operate each cylin der 3 to 4 times to the end of its stroke.
3) Finally, operate each cyl inder 4 to 5 times to the end of its stroke to completely r NOTICE If the engine is run at high speed imm ediately after startup or a cylinder is pushed up to its stroke end , air taken inside the cy linder may cause damage to the piston pac king. 4. Bleeding air from swing mot or 1) Run the engine at low idle check that oil oozes out 1) Run the engine at low idle , Loosen air bleedingplug (1) and from air bleeding plug (1). plug (1), then fill the mot or case with hydraulic oil.