TM 5-3805-262-343-29. CLEANING HYDRAULIC SYSTEMa. RemovalofContamimants(Sheet1of3).This task covers removal of contami-nants from hydraulic system oil.TOOLS: Fitting kit (FSCM 45225 PN CAS-10508)Portable filter (FSCM 45225 PN CAS-10162A)Vacuum pumpREFERENCES: TM 5-3805-262-20NOTEIf hydraulic system oil is contaminatedremove water from hydraulic system.by water, go to page 3-757 toIf there is visible evidence of contamination (hydraulic system oilcontains air, contains particles of metal or dirt, is dark and thick, orhas the odor of burnt oil) or if there is evidence of microscopiccontamination of hydraulic system (cylinder rod seals leak, controlvalve spools do not return to neutral position or resist movement,hydraulic oil is excessively hot, hydraulic system components wearrapidly or fail quickly after repair, or hydraulic system operation issluggish) remove contaminants as described below.(1) If contamination is visible, drain and refill hydraulic reservoir (referto TM 5-3835-262-20). If contamination is microscopic, drain and refillhydraulic reservoir only if scheduled (refer to PMCS table of TM 5-3805-262-20).(2)Remove and disassemble one hydraulic cylinder as-sembly (page 3-722, page 3-737, or page 3-744) ineach of two different circuits. Check for damageto seals, scoring of cylinder tubdamage. Repair as necessary. If dbe caused by severe contaminationnormal wear, it is necessary to rand repair all hydraulic system clines, and fittings.(3) Prepare portable filter for opera(a) Remove all hydraulic oil from inhoses of portable filter.(b) Remove filter element from porta(c) Drain all hydraulic oil from por(d) Clean inside surface of filterelement housing.(e) Install new filter element inportable filter.INLET ANDOUTLET HOSES3-754
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