According to the normal operation can't stall failure analysis engine

WD series engine flameout is accomplished by means of the exhaust braking device. When the engine to stall, the pilot foot exhaust brake button pneumatic valve, pneumatic valve ventilation exhaust brake adjustment after power cylinder, pneumatic valve adjustment power cylinder, pneumatic valve pneumatic butterfly valve core to rotate, blocking the exhaust pipe, at the same time on the pneumatic valve, exhaust brake button to stop the oil and gas cylinder, the oil quantity is close to the minimum position, in order to achieve the purpose of the engine.
the main cause of damage in the correct operation can't stall has the following several aspects:
( Exhaust brake button pneumatic valve failure. Air leakage or pipeline rupture stuffy, cause adjustment power cylinder pneumatic valve does not work, so the adjustment of pneumatic valve and pneumatic valve core cannot turn will exhaust pipe plug; Oil and gas cylinder stuffy, leakage, oil is still in a certain position, the engine cannot be shut down.
( Exhaust brake adjustment pneumatic valve fault power cylinder. Don't work, a flat, although on the exhaust brake button pneumatic valve, but because of the power cylinder gas leakage, the piston stroke, the exhaust pipe wall, so can't stall.
( Exhaust brake adjustment of pneumatic valve and power cylinder loose linkage, although power cylinder action, blocking the exhaust pipe.
( Biting, fuel injection pump plunger plunger spring break, stop although oil and gas cylinder movement, but does not move the throttle regulating rod, the engine is turning at a certain speed.
( Throttle stay stuck, don't return, can't stop the oil supply, so can't stall.
elimination method:
( If the stop button pneumatic valve or cylinder fault, should be replaced.
( Butterfly pneumatic valve power cylinder fault should be repair, if badly damaged should be replaced.
( Loose linkage should tighten, leakage should be replacing nylon - Pipeline.
( If the fuel injection pump plunger is biting, should repair, and check on the check table.
( If the throttle stay stuck, not return. It should be replaced the gas anchor.