. MAINTENANCE MAINTENANCE PROCEDURE 1. Bleeding air from pump the pump case with hydraulic oil, there is danger that the pump may be prematurely and 2) After completion of the air bleeding operation, tighten the air bleed plug. 4) Tighten air bleeder (2) after air bleeding has been finished. 4 - 47 BLEEDING AIR FROM HYD For de tails, see "STARTING EN GINE (PAGE 3-74)". If it is necessary to refer to the ite ms for starting t he en gine, movin g the machine off, steerin NOTIC E ump is operated without fil If the p damaged. Be sure to bleed the air ) Loosen air bleed plug ( check that oil oozes out (air bleeding is completed). 2.
Bl eeding air between pump NOTIC E If the e ngine is run at high speed wit hout bleeding the air between the p ump and hydraulic tank, ther e will be abnorma l generation o f heat , and this will lead to premat ure failure of the pump. ) Start the engine and ma intain it at a mid-range speed (1650 rpm). For details, (PAGE 3-74)". ) Operate the work equip ment slowly for approx. 5 minutes 3. Bl eeding air from LS circuit his work is to be conducte d only when any of the hydrauli c pump, valve and hoses i n the LS circuit i s replaced) NOTIC Unless air is bled from the LS circu it, malfunction of the work equipment ) Loosen air bleeder (2) hydraulic pump.
installed at the LS port of the minutes. e bucket for approx. two minutes n to each stroke end). the ) Idle the engine for two ) Continue to operate th (extension and retractio