The engine is the powerhouse of any construction machine, but in the motor grader, the case is slightly different. Indeed, the engine is the essential component; however, along with the powerful engine, there is another essential part. The blade is the most crucial part of the motor grader after all other components.
The overall productivity and finish of the grading work depend on the blade. It is the part that is used not only to smooth the roads but also to efficiently level the surfaces.
Thus, it is important to maintain the most essential part of the machine. Because over time, from the excessive use of the blade, it becomes rusty and shows some wear and tear.
Nonetheless, there are many options that you can keep your blade maintained and smooth. Also, if you want to replace it, that is another option.
For an operator working with a “used motor grader“, particularly, maintaining the blade becomes crucial. Over time, they get to know that the efficiency of the blade is low, so it needs some changes or repair work.
Knowing how to remove and replace the blade correctly ensures safety, protects the machine, and keeps projects running smoothly.
Here is a breakdown of the process, highlighting critical considerations and sharing practical tips to make this maintenance task efficient and safe.
What is to be Done According to the Project?
The changes of the blade depend on the work of the motor grader and the longevity of the construction project. Since many other things need to be done along with replacing the blade. That is why it is important to know the project type and budget.
If you are a small contractor working on a limited project with little budget. Then you do not have to replace the blade because it might cost you a lot. Rather, you can opt for the repair and maintenance option.
For that, you do not have to put an extra amount of money on a new blade and the process to change it.
Keep maintaining the blade in good condition, and over time, repair work would be an ideal option for small contractors.
However, if you utilize the motor grader recurrently and have a number of construction projects. Then you must replace the blade according to the project and work.
Preparing for Blade Removal
It is crucial to prepare before starting. Lower the motor grader’s blade to the ground after placing it on a level, stable surface. For extra safety, turn off the engine, apply the parking brake, and unplug the battery.
It is important for contractors to take extra time to examine the moldboard assembly when working with older or used motor graders.
Look for signs of excessive dirt accumulation, worn cutting edges, or rusted bolts, as these can make removal more challenging. It can save a lot of time to apply penetrating oil to bolts beforehand.
Safely Removing the Old Blade
It is a sensitive work and needs more attention and expertise. Thus, it is important to ensure all safety precautions are taken before starting the work.
A variety of bolts and clamps hold most motor grader blades at the boundary of the moldboard. Apply the proper socket size or impact wrench to loosen the bolts one at a time, and apply even tension.
Bolts may become seized on a used motor grader through age, or prolonged exposure to adverse conditions due to corrosion. In this situation, it might require a combination of penetrating oil, application of heat, and use of mechanical leverage.
In order to protect against flying debris or a chance release of bolts, always wear gloves and eye protection.
After completing the process of removing bolts, keep them away and safe from the blade. This could take two individuals or, with a hoist, since the weight of the blade might be too much to lift as a single individual to lift.
Inspect the Moldboard and Mounting Hardware
Following the removal of the blade, inspect the moldboard and attached components. Check for cracks, bending, or excessive wear on the moldboard face.
Verify that the mounting holes are not elongated or damaged, as this may influence the tight fit of the new blade.
For a used motor grader, worn bolt holes and rough moldboard edges are not uncommon.
Fixing this upfront before putting on the new blade guarantees proper alignment and minimum premature wear.
Removing damaged bolts, nuts, or shims at this point is much simpler than having to go back later in the field.
Installing a New Blade
Installing a new blade is one of the complex tasks. It is time-consuming as well because you have to be very careful about the alignment. When you install the new blade, make sure you align everything perfectly.
Later, set the blade and contact with the moldboard, and all the mounting holes are in the correct alignment.
Insert the hand bolts initially to prevent cross-threading and then tighten them down evenly in sequence to give an even pressure.
Torque settings for blade bolts are usually specified by the manufacturer, particularly on larger machines. Using a torque wrench, bolts are not over-tightened (thereby risking them moving during grading) or under-tightened (which can cause bolt breakage or moldboard stress).
For a contractor owning a used motor grader, it may be worthwhile to invest in good-quality replacement blades since this will help in enhancing grading accuracy and lower subsequent maintenance expenses. Wear-resistant (heat-treated) blades can be more costly at purchase but tend to last much longer.
Testing the Installation
After the new blade is installed, operate the motor grader and test on a controlled surface in slow motion.
Pay attention to any unusual sounds and observe for blade movement or vibration. Adjust blade pitch and angle slightly to ensure that the new blade cuts cleanly and evenly.
For used motor graders, testing becomes particularly crucial. Prior frame wear, linkage looseness, or hydraulic inconsistencies can still affect grading performance even after you install a new blade.
Detection of these problems at an early stage prevents uneven wear on the new blade
Maintenance Tips for Longer Blade Life
Proper maintenance increases your motor grader blade’s lifespan and reduces the need for replacements.
Steer clear of high-grading speeds as they hasten blade wear. When the wear becomes uneven, flip or rotate the cutting edge to keep the blade sharp.
To keep abrasive dirt and debris from prematurely wearing down the blade, clean the moldboard after every use.
Regularly lubricating the pivot points and moldboard slide rails on a used motor grader enhances grading control and subtly shields the blade from needless strain.
Final Thoughts
Removing and installing the blade of a used motor grader is an easy yet complex task. For removing and new blade, you have to take all the important measures.
Contractors can make their graders work to the best by learning how to remove the old blade, examine the moldboard, install the new blade, and learn how to identify the signs of wear.
Downtime, in construction, is expensive, and blade replacement is among those types of maintenance work that will pay back in performance and efficiency right away.
Be it road building, site work, or fine grading, a properly maintained blade is what it takes to yield smooth and accurate work.
