Seřídím převod imbusovým klíčem.

Seřídím is the 1st person singular form of the verb seřídit, so it means I will adjust / I will tune / I will set correctly.

The subject I is already built into the verb ending, so Czech does not need a separate pronoun já here unless you want emphasis.

This is because seřídit is a perfective verb.

In Czech, perfective verbs use present-tense endings, but they usually refer to a completed action in the future. So:

• seřídím = I will adjust
• not I am adjusting

If you want an ongoing or habitual meaning, Czech normally uses an imperfective verb instead.

You would normally use the imperfective verb, for example:

Seřizuji převod imbusovým klíčem.

In everyday speech, many speakers would also say the more colloquial seřizuju.

So the contrast is roughly:

• Seřídím... = I will adjust / I’ll get it adjusted
• Seřizuji... = I am adjusting / I adjust

Převod is in the accusative singular because it is the direct object of the verb: it is the thing being adjusted.

So in this sentence:

• Seřídím = I will adjust
• převod = the thing I will adjust

The dictionary form is the nominative singular, and for many masculine inanimate nouns, the accusative singular has the same form as the nominative.

So:

• nominative: převod
• accusative: převod

That is completely normal in Czech.

Převod can have several meanings depending on context, such as:

• gear
• transmission
• gear mechanism
• more generally transfer in other contexts

In this sentence, it most likely means a gear or gear mechanism, probably in a mechanical or bicycle-related context.

So the exact English translation depends on the situation, even if the Czech word stays the same.

Imbusový klíč is an Allen key or hex key.

• klíč = key, but also wrench/tool in some contexts
• imbusový = Allen / hex-type

So imbusovým klíčem means with an Allen key.

Because Czech uses the instrumental case to show the tool or means by which something is done.

Here, the tool is the Allen key, so imbusový klíč changes into the instrumental singular:

• nominative: imbusový klíč
• instrumental: imbusovým klíčem

That gives the meaning with an Allen key or using an Allen key.

Usually, not if you simply mean using an Allen key as a tool.

For the instrument used to perform an action, Czech normally uses the bare instrumental, without s:

• Seřídím převod imbusovým klíčem. = I’ll adjust the gear with an Allen key.

Using s + instrumental more naturally suggests accompaniment or having something with you, rather than the neutral idea of instrument:

• Jdu tam s imbusovým klíčem. = I’m going there with an Allen key.

So in your sentence, the version without s is the normal one.

Yes. Czech word order is fairly flexible, because the cases show the grammatical relationships.

Your sentence is a normal neutral order:

Seřídím převod imbusovým klíčem.

But other orders are possible, for example:

• Převod seřídím imbusovým klíčem.
• Imbusovým klíčem seřídím převod.

These versions are still grammatical, but the emphasis changes:

• putting převod earlier can highlight what will be adjusted
• putting imbusovým klíčem earlier can highlight the tool

So the original sentence is a good neutral choice.

Because Czech does not have articles like English a/an and the.

Whether something is definite or indefinite is usually understood from:

• context
• word order
• general situation
• sometimes other words in the sentence

So převod can mean a gear, the gear, or just gear/transmission, depending on context. English has to choose an article, but Czech usually does not.