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Collection of faults and solutions for wood chippers

Date: 06/16/2020 08:29:47 From: Clicks:

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We know that the wood chipper is the first step of the wood pellet production line. Only after the step of the chipper can the wood enter the hammer mill for crushing. Wood chippers and other mechanical equipment, no matter how good the quality, will fail after a period of operation. We will solve it if something goes wrong. The following small series summarize some faults and solutions that are prone to occur in the wood pellet plant.

Disc Wood Chipper
Disc Wood Chipper

1. Great Vibration of Wood Chipper

The reason of wood chipper vibration

The hydraulic system is out of oil, the wood chipper is running without oil.

The globe valve of the wood chipper hasn’t been turned off, and the handle of the manual fuel pump is on the position of oil return which makes the hydraulic system of wood chipper out of oil.

The oil pressure of the oil cylinder is not enough, the oil pressure is lower than the atmospheric pressure, so the energy accumulator doesn’t work.

The nitrogen pressure inside the energy accumulator is lower or higher than the required pressure, so the functions of energy storage and buffer are out of work.

The globe valve or the oil cylinder seals is damaged, so the oil pressure is not keepable.

The one-way throttle valve is fitted reversely which makes the feeding roller go down in a high speed.

The anchor bolt has not been fastened.

The discharge system is blocked.

The grinding quantity of the edges of the fly-cutters is not the same, or the weight of the fly-cutters is different.

Drum Wood Chipper
Drum Wood Chipper

The solution of wood chipper vibration

Feed the oil in the oil pump, and inject the regular oil pressure in the big oil cylinder.

During the working period of the wood chipper, the globe valve must be shut down, and the handle of the manual fuel pump must be put on the middle position.

Add the oil pressure, makes it just above the atmospheric pressure about 0.3 – 0.6 MPa.

Supplement or release part of the nitrogen, makes the nitrogen pressure meet the regular requirements.

Change the globe valve and the oil cylinder seals.

Reinstall the one-way throttle valve in the right direction.

Fasten the anchor bolt.

Remove the materials that cause the block of the discharge system, make sure that the discharged materials flow smoothly.

Exam the fly-cutters, and then regrind the blade or reweigh the fly-cutters.

2. What are the recommended safety precautions when using a wood chipper?

Basic common sense goes a long way. Wear gloves, a face shield, and ear protection when operating a wood chipper. Never look down the chute while the machine is running in case debris is thrown out. Always turn the machine off before clearing a jam. Keep children and animals away—accidents can occur if you're distracted.

Drum Wood Chipper
Drum Wood Chipper

3. How often do wood chipper blades need sharpening?

Manufacturers recommend sharpening after six to eight hours of use. You can tell by the way the machine is cutting. If the blades are blunt, you'll get ragged ends and splits instead of small, neat chips. Some blades can be re-sharpened, while others need to be replaced.

As chippers are used to produce large volumes of wood chippings and even sawdust, they are known to experience performance issues that are a result of blockages and other issues. The most common problems experienced by chippers include: a flooded engine, dirty air filters and incorrect settings. Use these instructions to help fix these problems before they get too serious:

Step 1: Check the throttle level of your chipper – if it is not set to the “start/run” position, the engine will not start. You should also check the choke level and make sure that it is set to “choke”. If the engine is running erratically, change the choke to the “run” position.

Step 2: If you believe that you have flooded the engine of your chipper, just leave it to sit for a few minutes and then try starting it as per normal.

Step 3: Check the fuel tank and top it up if you notice low or even no fuel level. If the tank is full but your chipper is still experiencing problems, drain the tank and fill it up with fresh fuel (old fuel can cause issues).

Step 4: Remove the air filter and replace it with a new one. You will need a screwdriver to loosen the screws on its cover, but then swapping over your filter is simple. Make sure that you put the cover back on before starting your chipper.

If none of the above steps have been able to fix the problem your chipper has been experiencing, you will need to take it to a professional for a more serious repair. To make sure that your machine is kept running in optimal condition, you should change its air filter after every 25 hours of use.

The above is the article for you: Collection of faults and solutions for wood chippers. If you are interested in our products or project solutions, please contact us. We will give you the best product quality and the best price. Email:

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