The more skills you have, the better! Two maintenance methods for road rollers

1. Method for expelling air from fuel pipelines

During the operation of a diesel engine, it stalls due to a lack of diesel in the fuel tank. After the diesel engine is turned off, although diesel is added to the fuel tank, air has already entered the diesel pipeline at this time, and it is impossible to restore fuel supply by using the hand oil pump.

To remove the air in the diesel pipeline and ensure the smooth start of the diesel engine, we adopt the following methods: First, find a small basin and fill it with a certain amount of diesel, then place it slightly higher than the hand oil pump. Secondly, remove the diesel pipe connecting the fuel tank to the hand oil pump and insert it into this small basin of diesel. Secondly, use a hand oil pump to pump diesel and completely remove the air in the low-pressure oil circuit. Finally, after reassembling the diesel pipe connecting the fuel tank to the hand oil pump and conducting a test run, the diesel engine started normally.

2. Disposal methods for damaged solenoid valves

It is difficult to start the diesel engine. Each time it starts, it takes a relatively long time before the diesel engine can be started with difficulty. We initially believed that the poor atomization was caused by the wear of the fuel injector, but after inspection, both the fuel injector and the fuel injection pump were found to be in good condition. When checking the start solenoid valve again, it was found that its electromagnet had no attraction.

When we remove the start solenoid valve and pull the fuel valve stem connecting the fuel injection pump and the solenoid valve by hand, the diesel engine can start smoothly. This indicates that the solenoid valve has been damaged. If new solenoid valves cannot be purchased in the nearby market for the time being, we can use thin copper wire to bind the fuel injection pump valve stem to prevent it from returning to its original position, and thicken the solenoid valve gasket to prevent oil leakage from the fuel injection pump valve stem hole. After the above processing, the solenoid valve was reinstalled and the roller was put into use. Just replace it after purchasing the newly started solenoid valve.