Anyone who works with concrete on a regular basis needs to maintain their concrete mixer. A common problem that you may run into is a worn-out bearing. The functioning of your mixer may be impacted when the bearing wears out, potentially leading to further damage over time and decreased efficiency. By keeping your mixer in top condition, knowing how to change the bearing will save you money and time.
Although changing a concrete mixer’s bearing may seem like a difficult task, you can do it yourself if you have the right equipment and some guidance. From recognizing the warning indications of a faulty bearing to taking out the old one and putting in a new one, this guide will lead you through every step. Whether you are an expert or a do-it-yourself enthusiast, these instructions are meant to make the process simple.
It’s crucial to gather all required parts and tools before you begin. The task will go more easily if you have everything you need on hand. Basic tools such as screwdrivers, wrenches, and possibly a bearing puller will be needed. Ensure that the new bearing you have fits the requirements of your concrete mixer. Remember to wear protective gear, such as gloves and safety glasses, as safety is also very important.
You can quickly restore the smooth operation of your concrete mixer by following these easy steps. Let’s get started with the information you need to know and the steps you’ll need to take in order to effectively and efficiently replace that worn-out bearing.
- Signs of malfunction
- Necessary tools and spare parts
- Work procedure
- Disassembly
- Assembly
- Video on the topic
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- How to replace bearings on a concrete mixer and how to melt teeth on a gear.
Signs of malfunction
If there is excessive crackling, noise, or rumbling when the concrete mixer is operating (even when it is not loaded), the bearing unit is probably malfunctioning. You should flip the bowl over and give it a quick shake with your hands to be sure. If there are two bearings on the shaft and one of them is faulty, you will notice a very noticeable play right away. This indicates that they need to be replaced.
Take note! Only in pairs, or simultaneously, are bearings changed, even if only one of them is no longer functional!
Although changing a concrete mixer’s bearing can seem difficult, anyone skilled in simple repairs can complete the task with the correct equipment and advice. To ensure that your mixer operates smoothly and effectively, this article will guide you through every step of the process, from determining whether a new bearing is needed to safely removing the old one and installing the new one. You’ll find the advice and methods required to maintain the best possible condition for your concrete mixer, regardless of your level of experience or expertise.
Necessary tools and spare parts
You will need a minimal set of replacement parts, which you can easily purchase at any construction market, and tools (which are typically already owned by any owner of a private home or cottage) in order to replace the bearings by hand:
- two new bearings (usual standard size 6203);
- wrench;
- hammer (quite heavy);
- puller (or vice);
- angle grinder with metal cutting disc;
- can of "liquid wrench" (WD40);
- bolts, nuts, lock washers (usually M8, 10 sets);
- pipe section (with a diameter corresponding to the diameter of the inner bearing race);
- metal spacer (slightly smaller in diameter than the concrete mixer shaft).
Work procedure
There are two steps involved in replacing the bearing on a gravity concrete mixer, and the process is not very difficult.
Disassembly
This step is to get rid of the outdated bearings.
- Turn the concrete mixer container over so that the crossbar is on top of the structure. Using a wrench, unscrew the bolt securing the concrete mixer shaft to the crossbar. Remove the washer and Grover, screw this bolt back into the shaft (to avoid damaging the thread). Using a spacer of a suitable diameter, carefully knock the shaft out of the crossbar and disconnect the drum from the frame. Remove the adjusting washers from the shaft.
Take note! The main gear’s proper contact with the crown will be disrupted if even one adjustment washer is lost, which could put an excessive amount of strain on the engine and cause it to overheat and fail.
- Disconnect the support from the tank. As practice shows, the nuts of the fastening bolts, which are located on the outside of the drum, rust heavily, since the production of concrete mix occurs with the use of water and at high humidity. To facilitate unscrewing the fastening bolts, use a "liquid key" (WD40), which we spray on the bolts. After 5-10 minutes, we try to unscrew them. If this method does not help, cut off the old nuts with a grinder.
- Separate the bowl support from the drum and separate it into two components (in which recesses are made – seats for bearings). To do this, with a pipe (or spacer) of a suitable diameter, knock out the shaft together with the bearings from the halves of the drum support.
- We remove old bearings from the shaft using a three-jaw puller or a vice.
Assembly
This stage’s objective is to install new bearings:
- Clean the shaft from dirt and rust with gasoline or solvent, then press new bearings onto it using a puller. If there is no puller, this operation is performed by carefully tapping the inner bearing races evenly around the circumference through a piece of pipe or a wooden block.
- Carefully hammer the shaft with pressed bearings into the lower half of the support. After this, put the second half on the upper bearing. Pre-lubricate the seats with lithol (this will simplify the pressing process).
- After this, attach the support with the pressed shaft to the container using bolts, washers, Grovers and nuts. To prevent the bolts from turning inside the drum, they must be held with a wrench. Therefore, you will need an assistant to perform this operation. Before installing the support along its entire perimeter in places of contact with the drum, we apply a layer of silicone sealant (to increase tightness and protect bearings from moisture).
- We put the adjusting washers on the shaft, then insert it into the hole in the crossbar and fix it with a clamping bolt through the washer and Grover.
Next, we test the concrete mixer without a load to see if there is enough engagement between the drive gear and the crown.
Video showing how to replace a bearing in a home concrete mixer:
Step | Description |
1. Preparation | Disconnect the mixer from power, clean it, and gather tools like wrenches, screwdrivers, and a new bearing. |
2. Remove the Drum | Detach the drum from the mixer by unscrewing bolts or nuts holding it in place. |
3. Access the Bearing | Locate the bearing housing, typically found at the bottom of the drum or on the motor shaft. |
4. Remove the Old Bearing | Use a puller tool to carefully extract the old bearing from its housing. |
5. Install the New Bearing | Place the new bearing into the housing, ensuring it fits snugly. |
6. Reassemble | Reattach the drum to the mixer and secure all bolts and nuts. |
7. Test the Mixer | Reconnect the power and run the mixer to ensure it operates smoothly with the new bearing. |
Although it may seem difficult, changing a concrete mixer’s bearing can be done quickly and effectively with the correct equipment and a little perseverance. You can approach the task with confidence if you know the fundamentals of your mixer and the function of the bearing. The secret is to go slowly and not rush the process.
Before you start, make sure you have all the required instruments and spare parts. You’ll avoid frustration and wasted time with this preparation. Pay close attention to the instructions and don’t forget to take safety measures like unplugging the mixer from any power sources. To prevent misplacing any tiny parts, work in a spotlessly ordered workspace.
Make careful to observe the fit of the parts as you remove the old bearing and replace it. Do not hesitate to consult the mixer’s manual or ask an experienced person for assistance if you run into any problems. Your mixer must be installed correctly to function properly.
Finally, perform a few tests to make sure everything is operating as it should after replacing the bearing. Keep an ear out for any strange sounds and look for any indications of misalignment. Your concrete mixer’s lifespan will be extended and it will remain in good operating order with routine maintenance, which includes timely replacement of its bearings.
You can successfully replace the bearing on your concrete mixer and make sure it keeps working well for your projects by following these steps. You’ll quickly resume mixing concrete with a little care and attention.