Usage:
D11N (4HK) Track-Type Tractors;
776C (2TK),
784B (5RK) Tractors;
777C (4XJ),
785B (6HK),
789B (7EK),
793B (1HL) Trucks;
5130 (5ZL),
5230 (7LL) Excavators
Reference: Service Manual Module, Systems Operation Testing And Adjusting 3508 EUI Engine, SENR5190-02, Page 14, "Automatic Altitude Compensation".
Service Manual Module, Systems Operation Testing And Adjusting 3512 And 3516 EUI Engines, SENR5596, Page 14, "Automatic Altitude Compensation".
Service Manual Module, Electronic Troubleshooting, 3508 EUI Engine, SENR5191-02, Page 5-116, "Engine Power Derating Map According To Atmospheric Pressure".
Service Manual Module, Electronic Troubleshooting, 3512 And 3516 EUI Engines, SENR5597-01, Page 5-106, "Engine Power Derating Map According To Atmospheric Pressure".
Service Manual Module, Systems Operation Testing And Adjusting 3508 EUI Engines, SENR5589, Page 14, "Automatic Altitude Compensation".
Service Manual Module, Electronic Troubleshooting, 3508 EUI Engine, SENR5590-01, Page 5-91, "Engine Power Derating Map According To Atmospheric Pressure".
Current 3500 EUI Machine Engines will automatically derate engine output for high altitude operation. Engine deration is necessary because there is less air for the engine to mix with the fuel for combustion at high altitude. If the fuel rate was not reduced at high altitude, higher than acceptable exhaust temperatures could be produced. This could result in damage to the engine.
All 3500 EUI Machine Engines are derated at the rate of 1 percent drop in output power for each 1.0 kPa (.15 psi) drop in atmospheric pressure. Chart A identifies the atmospheric pressure where deration begins, the corresponding altitude, and the correct Altitude Deration Chart for each machine. Chart B identifies the calculated altitude derate percentage.
Chart B
The Altitude Deration Charts in the References are not correct. The correct Altitude Deration Charts follow:
