XCMG QAY220, Operation Manual, Page: 60 / 172

QAY220 All Terrain Crane Operation Manual
4-6
Independent superstructure engine system is available for supplying power to lifting operation.
Acceleration makes engine speed up and down by hydrostatic pressure oil. Depress the accelerator
pedal in operator's cab, and the speed will be increased in engine, winch as well as in boom telescoping,
boom elevation and slewing operation. Remove your foot, the accelerator pedal will be reset by spring
force, and engine returns to idle. Refer to Fig. 4-5
1. During crane operation, never depress the accelerator pedal abruptly in prevention of accident
and damage. Steady increasing or decreasing oil will not only make the operation stable but also
prolong the engine life and reduce the oil consumption.
2. Max. engine rotation torque is gained when it is running in 1400 r/min. The movement of the
control lever combined with the accelerator pedal will make an ideal engine speed.
3. Before delivery of the crane, the mechanical accelerator has been set fully, and no necessary to
reset. Reset it only when bad return of the accelerator pedal or lumpy movement of accelerator pedal is
found. Adjustment of the accelerator should be done by professional staff. After resetting, 900 r/min of
idle speed should be reached, and 2100 r/min should not be exceeded when the accelerator is depressed
to its max. stroke.
Fig. 4-5 Accelerator pedal
4-3 Acceleration
4-3-1 Operating method
4-3-2 Notes on operation
Crane operation
Chapter 4
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