Maeda CC423S-1, Руководство по эксплуатации

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[7] VENTING AIR IN HYDRAULIC CIRCUITS
CAUTION
Running the pump without filling the pump case with hydraulic oil cause an early damage of
pump after giving off abnormal noise. Be sure to exercise the air venting.
1. Venting air in piston pump
1) Remove the oil filler cap of the hydraulic oil tank.
2) Loosen the venting bleeder (1) of the pump to
ensure that oil is oozing out of the bleeder
(indicating the completion of venting.)
3) After venting is completed, tighten the venting
bleeder.
Tightening torque: 7.9 ± 0.9 N · m (0.8 ± 0.1 kg · m)
4) Tighten the oil filler cap of the hydraulic oil tank.
CAUTION
Omitting pressurisation of the hydraulic tank causes the pump to suck air, resulting in adverse
effect on the units.
5) Set the boom in the completely retracted and fully raised state, mount the oil filler cap and
pressurise the tank.
6) After venting, refer to “Operation 3.1.2 Pre-operation Inspection [5] Inspection of Oil Level and
Refilling Oil in Hydraulic Oil Tank” to check the oil level in the hydraulic oil tank.
CAUTION
Revving the engine at the outset and allowing the cylinder to move the stroke end may damage
piston packing or other parts because of air inclusion in the cylinder.
2. Start the engine by referring to “Operation 3.2 Starting Engine”, and then keep at low idling for 10
minutes before starting work.
3. Venting the cylinder
1) While keeping the engine at low idling and refraining the cylinder from reaching the stroke end
(by stopping it approximately 100 mm before the stroke end), repeat telescoping for 4 to 5 times.
2) Next, allow each cylinder to reciprocate to the stroke ends for 3 to 4 times.
3) Further allow each cylinder to reciprocate to the stroke ends for 4 to 5 times to vent the air
thoroughly.
CAUTION
• If there are venting instructions specified by the manufacturer in the attachment itself, vent
the air as specified.
• After completion of air venting, stop the engine once to allow it to be standing still for 5
minutes, and then start the engine again. This releases the bubbles within the oil tank.
• Check for oil leakage, and wipe clean spilt oil.