TM5-3810-305-10Lower Boom1.2.When lowering boom to a hori-zontal position, work from sideof upperstructure, not underboom. Failure to follow thisprocedure could cause DEATHor serious injury.With a 5/ 16 in. hex allen wrench, remove plugfrom the hold valve cartridge protruding upon bottom side of hoist cylinder (Figure 4-55).With the same wrench, back-out internal plugcounterclockwise until wire retaining ringstops it. Do not force plug beyond this point.It cannot be removed because approximately0.5 in. (13 mm) of threads remain at stop.3.4.5.6.Everyone must be clear of thearea before moving hoist controllever. Failure to follow thisprocedure could cause DEATHor serious injury.Turn ignition switch ON. Push forward onboom hoist control lever in cab until boom islowered to horizontal position.Turn ignition switch OFF.Swing boom mechanically over one side(refer to page 4-56).Tighten internal plug on hold valve cartridge7.until it bottoms out in the original position.Replace plug.Swing boom mechanically over cab (refer topage 4-56).Figure 4-55. Internal Plug4-60
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