What are Common Misconceptions about Excavator Maintenance?

 Regular excavator maintenance, as we all know, is designed to reduce machine failures, extend machine life, reduce machine downtime, increase job efficiency, and lower operating expenses. But do you truly know how to keep it up to date? Do you know what the most common misunderstandings about excavators are? Let's look at some of the common misunderstandings concerning excavators in the following information.

Do Not Check the Plunger Stroke Allowance

When fixing and debugging the fuel injection pump, check the stroke margin first to see if the fuel injection pump can still be changed. The following approaches should be employed during the inspection, depending on the varied structures of the fuel injection pump:

1. Rotate the camshaft, push the plunger to the top dead center, remove the oil outlet valve and valve seat, and use a depth vernier to measure the distance.
2. After the plunger has been pushed to the top dead center, pull up the plunger spring seat with a screwdriver and lift the plunger to its maximum point. Then, using a thickness gauge, measure the distance between the plunger's bottom plane and the tappet's adjusting bolt. The plunger's standard stroke allowance is roughly 1.5mm, and after wear, the maximum stroke allowance should not be less than 0.5mm.

Do Not Use Abrasive Cloth to Polish the Bearing Bush

Tile scraping is a challenging task. The bearing bush is difficult to meet the technical standards because the scraping process is tough to master. As a result, instead of using a scraping pad to replace the bearing pad, some people use an abrasive cloth to enhance the contact area between the bearing pad and the crankshaft. Because the abrasive granules on the abrasive cloth are quite strong and the bearing metal is very soft, this procedure is exceedingly inadvisable in actual maintenance. As a result, abrasive particles are easily entrenched in the alloy during the grinding process, accelerating journal wear and shortening crankshaft service life when the diesel engine is running.

Avoid Adding Oil but not Changing it

Diesel engines require oil for lubrication, cooling, and cleaning, among other things. As a result, many drivers pay attention to checking the amount of lubricating oil and adding it according to the standard, but neglect to check the lubricating oil quality and replace deteriorated oil, resulting in some moving parts of the engine running in a poor lubricating environment all of the time, accelerating the wear of various parts.

Avoid Heating the Piston with an Open Flame

Because the piston and piston pin are an interference fit, the piston should be heated and enlarged before fitting the piston pin. Some repair workers will heat the piston directly over an open flame at this point, which is quite dangerous. If the piston cools naturally after reaching a particular temperature, the metallographic structure is damaged, the wear resistance is dramatically lowered, and the service life is drastically reduced. Heat the piston uniformly in hot oil before attaching the piston pin to allow it to expand slowly. Avoid heating directly over an open flame. If your piston is broken, you can have a look at the piston for Kubota v3800t.

Avoid Installing New Cylinder Liner and Piston without Matching

Consider the new cylinder liners and pistons to be interchangeable standard parts that can be utilized after installation for replacing cylinder liners and pistons. In practice, the dimensions of the cylinder liner and piston are within a specified tolerance range. The fit gap between the largest cylinder liner and the smallest piston will be too large, resulting in weak compression force and trouble starting. When replacing the standard cylinder liner and piston, it is required to check the size grouping code. Liners and pistons must be placed so that the standard piston's size group code matches the standard cylinder liner's size group code.

Do not Tighten the Bolts too Tightly

Many parts, such as gearboxes, cylinder heads, wheels, connecting rods, and front axles, have specific torque requirements throughout the disassembly and assembly operation of construction machines. The torque for tightening is defined in the manual and should not be modified at will. Many people, however, wrongly feel that tightening a little is safer, but overtightening can damage the screw or bolt, as well as cause failure due to thread slip.

Excavator maintenance problems should be recognized and avoided as soon as possible! I hope that the information provided above will assist excavator operators in maintaining their machines. Please contact us at Landtopmall if necessary!