TM 9-2350-256-20CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONS2-17 HYDRAULIC TROUBLESHOOTING-ContinuedHOISTING BOOM-ContinuedA Attempt operation of the hoist winch, main winch,and spade. If hoist winch, main winch, and spadedo not operate, troubleshoot main hydraulic systemand/or auxiliary hydraulic system. If hoist winch,main winch, and spade operate go to step B.B Visually inspect for damage. If damage exists andboom cannot be repaired, replace hoisting boom (seeparagraph 11-11). If signs of damage exist and canbe repaired, notify Direct Support Maintenance. Ifno signs of damage exist, go to step C.C Visually inspect for any indication of class III oil leakat stayline cylinder and actuating cylinder hydraulicconnections. If class III oil leaks are present, tightenfittings (see paragraph 12-1). If no leaks are present,go to step D.Do not attempt to loosen or tightenhydraulic fittings or lines when system ispressurized. Severe injury or death topersonnel may result.D Inspect for anydamaged or restricted hoses.Replace hoses as necessary (see paragraph 12-1). Ifno damaged or restricted hoses exist, go to step E.E Visually inspect for failed or missing boom orhydraulic cylinder attaching pins. If any failed orm i s s i n g p i n s e x i s t ,n o t i f y D i r e c t S u p p o r tmaintenance. If no failed or missing pins exist, go tostep F.Test equipment must be able to withstand1950-2050 psi (13,445-14,135 kPa),Improper test equipment could burst duringtesting and cause personnel injury or death.F Test for boom combination control valve failure.Perform STE/ICE-R Test No. 51 with 0-10,000 psigpressure transducer (Appendix C, item 51) installedin pilot-operated relief and unloading valve gageport. With the main hydraulic system operating,actuate boom combination control valve lever. If2 - 4 6Change 1
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