2003/06/09 Caterpillar

Excavator:

5130B (S/N: 4CS1-UP)

5230 (S/N: 7LL1-UP)

5130 (S/N: 5ZL1-UP)

5230B (S/N: 4HZ1-UP)

Off-Highway Truck/Tractor:

776D (S/N: 5ER1-UP)

784C (S/N: 2PZ1-UP)

789C (S/N: 2BW1-UP)

776C (S/N: 2TK1-UP)

777C (S/N: 4XJ1-UP)

777D (S/N: 3PR1-UP; 2YW1-UP; AGY1-UP)

784B (S/N: 5RK1-UP)

785B (S/N: 6HK1-UP)

785C (S/N: APX1-UP; 5AZ1-UP)

789B (S/N: 7EK1-UP)

793B (S/N: 1HL1-UP)

793C (S/N: 4AR1-UP; 4GZ1-UP)

797 (S/N: 5YW1-UP)

797B (S/N: JSM1-UP)

Wheel Loader:

992G (S/N: 7HR1-UP)

994D (S/N: 3TZ1-UP)

Track-Type Tractor:

D11N (S/N: 4HK1-UP)

D11R (S/N: AAF1-UP; 8ZR1-UP; 9TR1-UP; 9XR1-UP)

Wheel Dozer:

854G (S/N: AMP1-UP; 1JW1-UP)

Service Magazine SEPD0452, 18 January 1999, "Altitude Deration Charts For Caterpillar Machines Powered By 3500 EUI And 3500B Engines". Disregard this article. This article has been replaced by the following article.

The 3500 EUI and 3500B machine engines that power the machines that are listed above have schedules for the engine power derating that is dependent upon the altitude of operation. Refer to the tables and the graphs for the information for the engine derate that is specific for each machine.

Current 3500 EUI and 3500B Machine Engines will automatically derate engine output for high altitude operation. This altitude deration is necessary because the engine has less air for the air/fuel mixture for combustion at higher altitudes. If the fuel rate was not reduced at higher altitudes, higher than acceptable exhaust temperatures could be produced. This could result in damage to the engine.

All 3500 EUI and 3500B Machine Engines are derated at the rate of 1 percent drop in output power for each 1.0 kPa (0.15 psi) drop in atmospheric pressure. Table 1 identifies the following: the lowest atmospheric pressure with no engine derate, the corresponding altitude for the derate and the correct chart for the altitude deration for each machine. Table 2 identifies the percentage of the altitude derate.

Table 1

Model of machine	Approximate altitude with no derate	Lowest pressure with no derate	Application altitude deration chart
D11N, D11R, D11R CD, 776C, 776D, 777C, 777D, 784B, 785B, 789B, 789C, 5130, 5230	0 to 2286 m (0 to 7500 ft)	77 kPa (11.2 psi)	2286 m (7500 ft)
797B	0 to 2590 m (0 to 8500 ft)	74 kPa (10.7 psi)	2590 m (8500 ft)
793C HD (1)	0 to 2743 m (0 to 9000 ft)	72 kPa (10.4 psi)	2743 m (9000 ft)
784C, 785C, 797, 854G, 992G, 994D, 5130B, 5230B	0 to 3048 m (0 to 10000 ft)	70 kPa (10.2 psi)	3048 m (10000 ft)
793B, 793B HD, 793B HAA (2), 793C, 793C HAA	0 to 3650 m (0 to 12000 ft)	64 kPa (9.3 psi)	3658 m (12000 ft)
5130 HAA	0 to 3962 m (0 to 7500 ft)	62 kPa (9 psi)	3962 m (13000 ft)
785C HAA	0 to 4572 m (0 to 13000 ft)	57 kPa (8.3 psi)	4572 m (15000 ft)
797 HAA, 797B HAA	3048 to 4572 m (10000 to 15000 ft)	57 kPa (8.3 psi)	4572 m (15000 ft)
777D HAA	0 to 4877 m (0 to 16000 ft)	55 kPa (8 psi)	4877 m (16000 ft)

( 1 )	High displacement
( 2 )	High altitude arrangement

Table 2

Altitude	Atmospheric pressure	Percent of hp at 2286 m (7500 ft)	Percent of hp at 2590 m (8500 ft)	Percent of hp at 2743 m (9000 ft)	Percent of hp at 3048 m (10000 ft)	Percent of hp at 3658 m (12000 ft)	Percent of hp at 3962 m (13000 ft)	Percent of hp at 4572 m (15000 ft)	Percent of hp at 4877 m (16000 ft)
1458 m (4783 ft)	85 kPa (12.3 psi)	100	100	100	100	100	100	100	100
1558 m (5112 ft)	84 kPa (12.2 psi)	100	100	100	100	100	100	100	100
1660 m (5446 ft)	83 kPa (12.0 psi)	100	100	100	100	100	100	100	100
1762 m (5781 ft)	82 kPa (11.9 psi)	100	100	100	100	100	100	100	100
1865 m (6119 ft)	81 kPa (11.7 psi)	100	100	100	100	100	100	100	100
1969 m (6460 ft)	80 kPa (11.6 psi)	100	100	100	100	100	100	100	100
2074 m (6804 ft)	79 kPa (11.5 psi)	100	100	100	100	100	100	100	100
2179 m (7149 ft)	78 kPa (11.3 psi)	100	100	100	100	100	100	100	100
2286 m (7500 ft)	77 kPa (11.2 psi)	100	100	100	100	100	100	100	100
2394 m (7854 ft)	76 kPa (11.0 psi)	99	100	100	100	100	100	100	100
2502 m (8209 ft)	75 kPa (10.9 psi)	98	100	100	100	100	100	100	100
2612 m (8570 ft)	74 kPa (10.7 psi)	97	100	100	100	100	100	100	100
2722 m (8930 ft)	73 kPa (10.6 psi)	96	99	100	100	100	100	100	100
2833 m (9295 ft)	72 kPa (10.4 psi)	95	98	100	100	100	100	100	100
2945 m (9662 ft)	71 kPa (10.3 psi)	94	97	99	100	100	100	100	100
3058 m (10033 ft)	70 kPa (10.2 psi)	93	96	98	100	100	100	100	100
3172 m (10407 ft)	69 kPa (10.0 psi)	92	95	97	99	100	100	100	100
3287 m (10784 ft)	68 kPa (9.9 psi)	91	94	96	98	100	100	100	100
3403 m (11165 ft)	67 kPa (9.7 psi)	90	93	95	97	100	100	100	100
3520 m (11549 ft)	66 kPa (9.6 psi)	89	92	94	96	100	100	100	100
3637 m (11932 ft)	65 kPa (9.4 psi)	88	91	93	95	100	100	100	100
3728 m (12231 ft)	64 kPa (9.3 psi)	87	90	92	94	100	100	100	100
3876 m (12716 ft)	63 kPa (9.1 psi)	86	89	91	93	99	100	100	100
3996 m (13110 ft)	62 kPa (9.0 psi)	85	88	90	92	98	100	100	100
4117 m (13507 ft)	61 kPa (8.8 psi)	84	87	89	91	97	99	100	100
4239 m (13907 ft)	60 kPa (8.7 psi)	83	86	88	90	96	98	100	100
4363 m (14314 ft)	59 kPa (8.6 psi)	82	85	87	89	95	97	100	100
4487 m (14721 ft)	58 kPa (8.4 psi)	81	84	86	88	94	96	100	100
4612 m (15131 ft)	57 kPa (8.3 psi)	80	83	85	87	93	95	100	100
4738 m (15545 ft)	56 kPa (8.1 psi)	79	82	84	86	92	94	99	100
4864 m (15958 ft)	55 kPa (8.0 psi)	78	81	83	85	91	93	98	100
4992 m (16378 ft)	54 kPa (7.8 psi)	77	80	82	84	90	92	97	99
5121 m (16801 ft)	53 kPa (7.7 psi)	76	79	81	83	89	91	96	98

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