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Causes and Solutions of Unstable Speed of Tractor Engine

Views: 278     Author: Site Editor     Publish Time: 2020-06-30      Origin: Site


Tractors will encounter many tractor engine problems like unstable engine speed during operation, which needs to be eliminated in time, otherwise it may cause very serious consequences. The specific exclusion method can refer to the following three points.

 

tractor engine


1. The tractor does not run smoothly under heavier loads, but it runs more smoothly when it is empty or downhill. Check whether the tractor fuel system is clogged and the incoming oil is not smooth.

 

2. Remove the observation hole cover on the tractor gear chamber cover, start the engine, and hold the speed lever with a screwdriver to fix it at a certain position. If the operation is stable, it indicates that the fault may be in the tractor engine governor, and the following checks should be carried out.

 

(1) First of all, check whether there are too loose parts in the connections of the external speed governing mechanism of the tractor engine, otherwise, remove the obstacles of looseness.

 

(2) If the operation is still unstable after removal, remove the gear chamber cover and check the internal structure of the governor. The internal structure of the governor should mainly check whether the tractor gear shaft of the governor and the body are loose, and whether the two arms of the governor lever are uneven.

 

(3) If the two forks are severely worn, a paper gasket with a thickness of about one millimeter can be added between the speed control slide and the one-way thrust bearing. Note that the paper pad must not be too thick, otherwise, the maximum engine speed will be reduced, thereby reducing the power.

 

If the speed is not stable after the above treatment, check whether the governor lever is blocked, whether the plunger adjustment arm of the fuel injection pump is too large in the fork slot of the governor lever, and whether the plunger is blocked in the plunger sleeve, etc. We should pay attention to the tractor engine parts and their functions and maintain them better.

 

tractor engine parts


3. Use a screwdriver to press and hold the speed lever. If the operation is not stable, it means that the fault is not in the governor, and the fuel system should be checked.

 

First, loosen the nut of the fuel pipe joint on the fuel injection pump. If air bubbles come out, it can be confirmed that air has entered the oil passage, and the oil pipe should be checked for rupture and whether the pipe joint nut is loose. The tractor engine cleaner is very important. In particular, pay attention to whether the oil pump outlet valve gasket is cracked or the seal is not tight, whether the oil pump plunger positioning screw is loose, etc. After checking these situation, it is good for avoiding tractor engine burning oil situation.

 

tractor engine cleaner


After the above inspection and repair, the engine speed is still not stable, you can remove the injector from the cylinder head and replace it with a new injector for testing. If the fault is resolved, the fault is on the fuel injector. You can also remove the fuel injector and reinstall it on the high-pressure fuel pipe, shake the engine, and observe the fuel injection of the fuel injector. If the atomization is bad, there is dripping oil or the needle valve is stuck, you can grind or replace it. 


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