Komatsu Galeo PC800-8 Shop Manual page 259

Hydraulic excavator

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10 Structure, function and maintenance standard

1) Control method in each mode

Matching point in P, E mode: Rated output point

(Including fan pump absorption horsepower at

fan max. speed)

When the load on the pump rises and the pres-

sure rises, the engine speed goes down.

At this time, the pump discharge (Q) is reduced

and the engine speed (N) is set about the rated

output point. If the pressure lowers, the pump

discharge (Q) is increased until the engine

speed is set about the rated output point.

By repeating this control, the engine can always

be used at near the rated output point.

Compared with the P mode, which provides the

maximum output, the E mode lowers the engine

output to provide matching at a point which gives

better fuel consumption efficiency than the P

The P mode uses the CO cancel so it can gener-

ate a greater discharge (Q) of oil than in the E

mode at high pressure.

PC800, 850-8

370 kW/1,800 rpm

{496 HP/1,800 rpm}

316 kW/1,650 rpm

{423 HP/1,650 rpm}

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