. MAINTENANCE PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS SAFETY CRITICAL PARTS 4 - 20 PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS To en sure saf ety at all t imes wh en operating or driving t he machine , the user o f the machine m ust alw ays carry out perio dic maintenance. In additi on, to further i mprove s afety, the p arts in the safety-critical pa rts list on the below must also be r eplaced at the s pecified interva l. These parts are particularly closely connect fire prevention, so please c ontact y our Komatsu d istributor to have the m replace Mate rial qualit y of these parts c an change as t ime passes and the y are likely to wear out or de teriora te.
However, it is di fficult to determine the ext ent of w ear or d eterioration at the tim e of period ic maintenance. Hence , it is required to rep lace the m with n ew ones regardles s of their condition after a certain period of usage. This is important to ensu re that th ese parts maintai n their full performance at all times. Furthermore, s hould an ything a bnorma l be fou nd on an y of these pa rts, replac e it with a new on e even if the periodic replacement ti me for th e part h as not yet arriv ed. If any of the h ose clam ps show deterioration li ke deformation or cr acking, rep lace the clamps at the same time as the h oses.
Also perform t he check s with hy draulic hoses which need to be rep laced periodically. Tighten all loos e clamps a nd repla ce defect ive hoses , as req uired. e O-rings, gaskets, and other such parts at the same time. When replacin g hoses, always replac e O-ring s, gaskets, and othe r such part s at the same tim No.
Safety critical parts for periodic replacement Replacement interval Remarks 1 Fuel hose (strainer - fuel filter) Fuel hose (fuel filter - fuel pump) Fuel hose (engine - fuel cooler) Fuel hose (fuel cooler - fuel tank) Rubber hose for brake piping High-pressure hose in steering oil pressure circuit (pump ←→ demand valve ←→ steering valve ←→ steering cylinder) High-pressure hose in hoist circuit (pump ←→ demand valve ←→ hoist valve ←→ hoist cylinder) Hose at discharge side of retarder cooling pump Hose at discharge side of transmission pump Accumulator EVERY 4000 hours or 2 years, whichever comes sooner 2 3 4 5 Replace as Ass'y 6 7 8 9 10 Replace as Ass'y 11 Seat belt Every 3 years after beginning to use or 5 years after manufacturing of seat belt, whichever comes sooner Replace