TM 9-2350-256-20CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONS2-17 HYDRAULIC TROUBLESHOOTING-ContinuedMAIN HYDRAULIC SYSTEM-ContinuedParticles blown by compressed air can bedangerous. Be certain to direct airstreamaway from user and other personnel in thearea. Compressed air used for cleaningpurposes will not exceed 30 psi. Use onlywith effective chip-guarding and personnelprotective equipment (goggles/shield andgloves.Clean hydraulic oil filter element in dry-cleaningsolvent (AppendixD , i t e m 9 ) a n d d r y w i t hcompressed air. Install filter element and cover andgo to step B.B Remove left- and center-front air inlet grilles (seeparagraph 9-57). Inspect power takeoff coupling tosee that drive shaft is firmly attached to powertakeoff coupling. Tighten bolts and/or replacemissing bolts and lockwashers and go to step C.Keep hands and arms away from fan bladeand drive while engine is running, orserious injury to personnel will result.C Have assistant start engine. Observe power takeoffcoupling and drive shaft. If they are not turning,remove powerplant (see paragraph 3-1). Installholding bar and pulley (Appendix C, item 14) andtighten power takeoff retaining nut. Torque nut to240-250 lb-ft (1655-1724 Nom) and go to step D.D Remove hydraulic line intermediate rear right centerfloor plate (see paragraph 9-11). Remove pipe plugfrom mechanical transmission and install pressuregage (Appendix C, item 25). Operate engine at 1600rpm. Lubricating oil pressure should be 10-19 psi(69-131 kPa). If lubricating oil pressure is 10-19 psi(69-131 kPa), go to step E. If lubricating oil pressureis not 10-19 psi (69-131 kPa), notify Direct SupportMaintenance.E Disconnect hydraulic line. Install tee and pressuregave (Appendix C, item 25). Connect hydraulic line.O p e r a t e e n g i n e a t 1 6 0 0 r p m . M e c h a n i c a l2-50Change 1
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