What happened to the electric saw after 50 sawn blocks. Aerated concrete cutting machine repair

The electric saw installed on the aerated concrete saw did not work for a long time. I was ready for this, but I did not expect that the breakdown would happen so quickly. I thought it was enough for the first floor. From the sounds it became clear that the gearbox bearing installed on the sprocket shaft had failed.

It was not enough to finish with a couple of dozen blocks for gluing the U-blocks of the armopoyas.

A short video demonstrating the process of sawing aerated concrete.

He began to disassemble this miracle of Chinese industry:

He took off the bearing protection. It can be seen that there is no lubricant. Inside the case, everything is in aerated concrete crumb, which has adhered to the grease. The saw is not intended for use in such conditions (crumbs and dust from aerated concrete work as an abrasive). But I deliberately went to the assembly of the machine, because it made the job easier and I saved time for other work.

Fully disassembled power saw. It turned out that three of the four bearings are for replacement. The thought arose: is it necessary to continue, maybe to buy another, used electric saw according to the ad? But I decided to replace the bearings myself. In addition, a puller to replace them was previously purchased. But he was in the apartment. I took the rotor with me in the evening.

The sprocket and the chain itself practically did not wear out. The tire has slightly decreased in height.

He took off the bearings. The third bearing from the gearbox was removed on the site with a wooden wedge.

Bearings of an unknown Chinese brand. This is not even known in the company that supplies bearings (where they bought new ones). I bought Japanese ones for replacement, maybe their resource will be slightly higher and the electric saw will work longer in such conditions.

Assembling an electric saw in the field. But after assembly, it did not work. It just didn't turn on. Disassembled, probably, five times. I checked all the contacts. Spent another evening looking for the problem. The problem was the lack of contact between the brush and the rotor contacts. The brush, due to a defect in the brush receiver, did not reach the stator 1-2 mm. Even the force of the screwdriver did not help, let alone the force of the spring. I sharpened the brush from one edge and it worked.

Further the machine was modified. I didn't install the cover in the area of ​​the "asterisk" - just tightened the tire on the nut. There will be less crumbs in this knot. I installed a plastic cover so that crumbs and dust are less sucked into the body and the lower bearing does not wear out so much.

Because the oil supply is clogged with crumbs, then after 1-2 cuts, he lubricated the tire with oil with a small brush. The tire will live longer and, possibly, after repair it will be enough for the entire construction site.

For some, this is an extra fuss: assembling the machine, and then repairing it due to a low resource. It is easier to cut by hand with an Alligator saw. But an even cut along the block will not work. And it is needed for gluing U-blocks. He basically dismissed the formwork of boards for pouring lintels and armopoyas.

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Photos of the author (c)

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