Why does the rig run fine at low speeds but no high speeds and too little smoke exhaust?

Low engine speed is good, but acceleration speed can never be increased, driving weakness, is the cycle of insufficient oil supply caused by

1. Improper adjustment of the injection pump, so that the fuel supply is reduced.
2. The spring force of the governor is reduced due to fatigue. When the throttle pedal to the end, the oil regulator lever can not be moved forward to the head, resulting in a reduction in the amount of fuel supplied by the injection pump, the engine can not reach the rated speed
3. The injector pump plunger and sleeve, injector needle valve, and needle valve body had serious wear and tear, so the pumping of diesel fuel leakage increased, resulting in the relative reduction of fuel supply.
4. Improper adjustment of the throttle lever, or the throttle pedal pin is too open, so that the throttle pedal can not be in place, resulting in too little fuel supply at full load.
5. There is air in the oil circuit.

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