Reaper-Binder – How to Deal with Binding Failure

This is the article translated from NOUKINAVI blog.

You can find the original post (in Japanese) here: バインダーの結束不良とその対処法について | ブログ|ノウキナビ (

The problems that account for 80% of all binder problems are “binding failure,” where the string does not bind the rice well, and cases where the string gets tangled in the machine.
However, this is a problem that can often be solved by simply taking a few precautions before use, so I would like to introduce some of the key points.

Common Cause No.1

The most common cause is the string itself. I recommend using the genuine binder string provided by each manufacturer.


Genuine binder twine has a consistent thickness and accuracy, and is naturally designed to be compatible with the machine, so it is less likely to cause binding errors.

Also, be careful with strings that have been bought and stored for years, such as strings that you bought last year.
The condition of the cord can also be a cause of trouble, as it may contain a lot of moisture.

Common Cause No.2

The next thing to consider is the lacing part of the binder. Usually, there are instructions on the binder on how to thread the strings, so just follow the instructions and you should be fine.


The points to note are the “string brake” and “how to thread the string through the string feed bar. If a stone or fir is caught in the string brake, you will not get the normal friction and it is easy to make a binding mistake.
Also, be sure to thread the string through the hole at the end of the string feed bar.


If the tying error does not subside even after performing the above steps, the machine itself may be malfunctioning, so please consult your local agricultural machinery repair store.

KiliMOL’s Reaper-Binder stocks are found in the following link:

Reaper Binders (

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