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Common faults and troubleshooting methods of small road rollers

Views : 650 Update time : 2022-01-10

With the wide application of road rollers, its own defects have gradually emerged. The failure rate of road rollers in work is high, which greatly affects the quality of work. Through the analysis of common faults of road rollers, this paper proposes specific solutions to the faults of road rollers.

1. Fuel line air removal method

The diesel engine of the road roller stalled due to lack of diesel in the fuel tank during use. After the diesel engine is turned off, although diesel is added to the fuel tank, air has entered the diesel pipeline at this time, and the fuel supply cannot be restored by using the hand pump.

In order to remove the air in the diesel pipeline and make the diesel engine start smoothly, we take the following methods: first, find a small basin and hold a certain amount of diesel oil, and place it at a position slightly higher than the diesel pump; secondly, put the fuel tank Remove the diesel pipe connecting the hand oil pump, and remove the diesel oil in this small basin; again, pump the diesel oil with the hand oil pump to remove the air in the low-pressure oil circuit; finally, install the diesel pipe connecting the fuel tank to the hand oil pump. Test machine, the diesel engine starts normally.

2. Solenoid valve damage disposal method

If it is difficult to start the diesel engine, it will take a long time to start the diesel engine. We initially thought that it was caused by the poor atomization of the injector, but the inspection of the injector and the fuel injection pump were all good. When I checked the start solenoid valve again, it was found that its solenoid was not attractive.

We will remove the starting solenoid valve, and when the fuel valve stem connecting the fuel injection pump and the solenoid valve is pulled by hand, the diesel engine can be started smoothly, which means that the solenoid valve has been damaged. Since the new solenoid valve cannot be purchased in the nearby market temporarily, we use thin copper wire to bind the fuel injection pump stem to prevent it from returning, and thicken the solenoid valve gasket to prevent the fuel injection pump stem hole. Oil leaks from the mouth. After the above treatment, the solenoid valve is reassembled, and the roller is put into use. After purchasing a new start solenoid valve, it can be replaced.

3. Deformation repair method of front wheel support

When the static pressure road roller failed to start, in order to start the road roller, a loader was used on site to push and start the road roller. As a result, the frame supporting the front wheel of the road roller was deformed, and the welding part of the shaft sleeve matched with the front fork and the vertical shaft was dislocated. , the roller cannot be used.

Usually, to repair this fault, the front wheel frame, vertical shaft and front fork must be disassembled, but such repairs are time-consuming and laborious. To this end, we have adopted the following simple recovery method: first, adjust the front wheel to the forward direction; secondly, cushion the front wheel, the front wheel frame and the front fork beam with wood, so that it can move forward when turning the steering wheel. The wheel does not rotate; again, turn the steering wheel, remember the total number of turns of the steering wheel, turn to the limit position and then turn back half of the total number of turns, the misaligned front fork and the shaft sleeve matched with the vertical shaft can return to the correct position; then , Remove the 14 fixing bolts on both sides of the front wheel frame, use the jack to lift the front wheel frame about 400mm to make it away from the front wheel axle; finally, use electric welding to weld the vertical shaft bushing firmly, loosen the jack, and drop the front Wheel fork, install the front wheel frame and the front wheel axle. In this way, only one person can adjust the deformation of the front wheel frame in place.

4. Repair method for poor positioning of gear lever

The locating pin of the shifting lever equipped with the static calendering roller is easy to fall out or be cut off, thus causing the shifting lever to be unable to be positioned. The locating pin is 4mm in diameter and is used to prevent the gear lever from turning.

In order to solve this problem, we take the following methods: first, expand the diameter of the pin hole of the shift lever to 5mm, and tap the M6 internal thread; secondly, modify the width of the pin slot of the shift lever to 6mm; finally, configure 1 M6 screw and 1 For M6 nut only, screw the screw into the seat pin hole, back it half a turn, and then tighten the nut.

5. The solution to the oil leakage of the sealing ring

The vibrating valve of the vibratory roller leaked oil. After the Y-shaped sealing ring was replaced, the oil leaked after a short period of use. The inspection found that after long-term use of the vibration valve, the wear between the upper cover of the valve core and the valve core was serious.

In order to solve this problem, we adopt the method of adding O-shaped or flat-shaped sealing ring, that is, adding O-shaped or flat-shaped sealing ring to the groove of Y-shaped sealing ring. There is no oil leakage phenomenon after the vibration valve is installed with a sealing ring, which proves that the method achieves good results.