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Home›Repair guides›Fuel Injector Assembly Removal and Installation

Komatsu — Fuel Injector Assembly Removal and Installation

A Komatsu service procedure — check it applies to your exact model before use.

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Procedure

  1. Disconnect the negative (–) terminal from battery.
  2. Drain coolant.
  3. Close the fuel stopper valve on the fuel tank.
  4. Remove connector (P24), overflow tube (1) and sub-tank (2).
  5. Remove the mounting bolt and then hoist the engine hood assembly (3) to remove.
  6. Remove clamp (4) and remove air intake tube (5).
  7. Remove the clamp and disconnect hose (9) between the radiator and the engine at the radiator side.
  8. Remove covers (6), (7), and fan guard (8).
  9. Remove oil filter (10), leaving the tube unremoved.
  10. Remove fuel pre-filter (11).
  11. Remove priming pump (12).
  12. Remove fuel main filter (13).
  13. Disconnect the terminal of intake air heater harness (14).
  14. Remove the air intake connector (15).
  15. Disconnect the connector EGR (16), SEGR (17), TIM boost temperature (18), wiring clamp (19), PIM boost pressure sensor (20), PAMB atmospheric pressure sensor (21) and connector (22).
  16. Remove clamp (23), bolts (24) and bracket (25) to remove the housing complex (diffuser) (26).
  17. Disconnect injector harness connectors (27) at 6 places, remove the clamp and shift the harness to the lower left-hand side of the engine.
  18. Remove clamps (28) and boots (29).
  19. Remove the clamp and 6 high-pressure injection tubes (30).

Specs & torque values

  • Coolant: 36 l

Source: manual:Komatsu Hydraulic Excavators PC400, PC400LC, PC450, PC450LC Repair Service Manuals (p4513-p4514).pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.