Complete workshop & service manual with electrical wiring diagrams for Komatsu 125 Series Engines. It's the same service manual used by dealers that guaranteed to be fully functional and intact without any missing page.
This Komatsu 125 Series Engines service & repair manual (including maintenance, overhaul, disassembling & assembling, adjustment, tune-up, operation, inspecting, diagnostic & troubleshooting…) is divided into different sections. Each section covers a specific component or system with detailed illustrations. A table of contents is placed at the beginning of each section. Pages are easily found by category, and each page is expandable for great detail. The printer-ready PDF documents work like a charm on all kinds of devices.
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01 GENERAL................ 01-1
11 STRUCTURE AND FUNCTION, MAINTENANCE STANDARD................... 11-1
12 TESTING AND ADJUSTING............... 12-1
13 DISASSEMBLY AND ASSEMBLY............ 13-1
15 REPAIR AND REPLACEMENT OF PARTS.......... 15-1
REPAIR AND REPLACEMENT OF PARTS CYLINDER BLOCK
★ When grinding the crankshaft to correct wear, light seizure or damage, grind to an undersize.
★ If there is curvature of the crankshaft, it is preferable to replace the crankshaft and not to grind it to an undersize. (There are problems with balancing.)
★ Do not try to correct a bent crankshaft with a press. When the engine is run, the crankshaft will gradually return to its bent shape.
★ The journal portion has been given induction hardening, so do not try to repair it by bead welding or plating.
★ Unevenly worn crankshafts will bend or be unbalanced even if repaired, so always replace unevenly worn crankshafts.
★ Measure the part for grinding to decide the undersize dimension.
★ Judge from the measured dimension, and if the undersize dimension will exceed the repair limit, replace the crankshaft.
★ When repairing the plating of the damaged surface, repair only the following places.
1) Rear seal journal portion
2) Crankshaft gear mount
★ When correcting damage to the crankshaft, pay particular attention when finishing the R portion of the fillet and shoulder r (see the diagram on the right) and the R at the inlet port of the oil hole.