1. Why can't I increase the throttle when the loader forklift diesel engine is just started?
After the diesel engine of the loader forklift is just started, it should run at a low speed for 3 to 5 minutes to:
① Warm up: let all parts of the body warm up slowly and evenly to reach the normal working temperature, reduce wear and avoid mechanical strain;
② Ensure lubrication: when the diesel engine is just started, the lubricating oil viscosity is high, and the lubrication of all parts is poor. After the engine is warmed up, the lubricating oil gradually reaches the lubrication parts to avoid dry friction and damage to the mating surface;
③ After the diesel engine has just started, the machine temperature is low and the diesel combustion is incomplete. At this time, if the throttle is increased and the fuel supply is increased, the excess unburned diesel will form carbon deposits, which will aggravate the emissions of the diesel engine. In addition, excess diesel oil may flow into the crankcase along the cylinder wall, affecting the lubrication of the cylinder wall, diluting the oil in the oil pan, reducing the lubrication performance and reducing the service life of the diesel engine.
For diesel engines equipped with exhaust gas turbochargers, more attention should be paid to warming up.
If the throttle is increased immediately after starting, the speed of the turbine will increase, and the oil will not reach the surface of each lubricating part in time, which will not form a good lubrication, and it is easy to cause the turbine shaft to jam, resulting in failure.
2. What are the reasons for the sudden shutdown of the loader forklift diesel engine? What should be done?
When the diesel engine suddenly stops automatically while working, do not start the diesel engine again immediately, carefully analyze and check the reasons for the sudden shutdown of the diesel engine, and then start the operation after repair.
The main reasons for sudden shutdown of loader forklift diesel engine are:
A sudden shutdown is caused by the failure of the oil supply system. This shutdown phenomenon is caused by air entering the fuel supply circuit of the diesel engine or fuel supply interruption. Before the sudden shutdown of the diesel engine, the rotating speed fluctuates from high to low, and the working temperature is unstable. The causes of fuel supply interruption include:
A. In case of insufficient fuel in the diesel tank, add enough fuel;
B. The oil circuit is not tightly sealed. In case of such failure, it can be judged by bleeding the fuel system after shutdown. If a large number of foam like oil bubbles are released at the vent screw by pumping oil with the hand oil pump, the shutdown is caused by oil and gas in the oil. The tightness of the low pressure oil circuit should be carefully checked.
C. The camshaft of the fuel injection pump is broken or the key is rolled, and the connecting plate is broken. The fuel injection pump should be repaired.
II. Crankshaft locking causes sudden shutdown
After shutdown, observe whether the water temperature is abnormal and whether there is water in the oil pan (the oil is emulsified). If the inspection is normal, the crankshaft of the diesel engine should be turned. If it feels hard to turn or cannot turn, it can be judged that the crankshaft is burnt or locked after burning the bearing bush.
After the failure of bearing bush burning occurs, it is necessary to find out the cause, clean the oil passage, grind the crankshaft, replace the bearing bush and a few parts (connecting rod, etc.) before assembling the test machine.
Sudden shutdown caused by three-cylinder pulling
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