24. SERVICE PROCEDURE 24.2.20 CHECK APS (Automatic Priming System) Check the APS in autumn (ambient temperature below 15°C, engine cooling water temperature below 13°C). If it is necessary to inspect the APS when the engine cooling water is above 13°C, so please contact your Komatsu distributor. 1. Open fuel valve 1 of the APS and remove hoses 2 of the nozzle inlet. 2. Move feed pump 3 up and down to bleed air until no air bubbles comes out of the hose connecting port. At the same time, check for fuel leakage and clogging of fuel pipe. 3. Place the fuel control lever in the “engine stop” position. Turn the starting switch to ON position. Turn on the preheater switch.
Then, confirm the following. Confirm that the preheater monitor lamp stays on for about 80 seconds. Confirm that when the preheater monitor lamp goes off, the two glow plugs are red hot. With preheater monitor lamp off, turn the starting switch key to START position (do not keep the key in this position for more than 20 seconds), and check for proper fuel combus- tion inside the intake manifold. When checking the glow plug, remove plug. If any abnormality is assumed, refer to the “16. TROUBLE SHOOTING”. 3-41