Galeo PC78MR-6, Руководство по эксплуатации и техническому обслуживанию

Страница: 242 / 295

.
MAINTENANCE
MAINTENANCE PROCEDURE
BLEEDING AIR FROM HYDRAULIC SYSTEM
For details, see "STARTING ENGINE (PAGE 3-72)". If it is necessary to refer to the items for starting the engine,
moving the machine off, steering, or stopping, see the OPERATION section.
1. Bleeding air from pump
NOTICE
If the pump is operated without filling the pump case with hydraulic oil, there is danger that the pump may be prematurely
damaged. Be sure to bleed the air completely.
1) Loosen air bleed plug (1) installed to the drain port and
check that oil oozes out (air bleeding is completed).
2) After completion of the air bleeding operation, tighten the
air bleed plug.
2. Bleeding air between pump and hydraulic tank
NOTICE
If the engine is run at high speed without bleeding the air between the pump and hydraulic tank, there will be abnormal generation
of heat, and this will lead to premature failure of the pump.
1) Start the engine and maintain it at a mid-range speed (1650 rpm). For details, see "STARTING ENGINE
(PAGE 3-72)".
2) Operate the work equipment slowly for approx. 5 minutes to bleed the air.
3. Bleeding air from LS circuit
(This work is to be conducted only when any of the hydraulic pump, valve and hoses in the LS circuit is replaced)
NOTICE
Unless air is bled from the LS circuit, malfunction of the work equipment may be invited.
1) Loosen air bleeder (2) installed at the LS port of the
hydraulic pump.
2) Idle the engine for two minutes.
3) Continue to operate the bucket for approx. two minutes
(extension and retraction to each stroke end).
4) Tighten air bleeder (2) after air bleeding has been finished.
4 - 47