Ledningsfloken blokkerer hovedhjulet.

Because Norwegian, like German, very often forms compound nouns by joining words together.

• ledning
  • floke → ledningsfloke
• hoved
  • hjul → hovedhjul

English often writes these as separate words, but Norwegian usually prefers one combined word.

This is very common in Norwegian:

• bok
  • hylle → bokhylle
• barn
  • bok → barnebok

So in this sentence, both nouns are compounds, and then they are also put into the definite form:

• ledningsfloke → ledningsfloken
• hovedhjul → hovedhjulet

The -en is the definite singular ending for many masculine nouns in Norwegian. It works like the in English.

So:

• en ledningsfloke = a cable tangle / a tangle of wires
• ledningsfloken = the cable tangle / the tangle of wires

A key difference from English is that Norwegian often puts definiteness at the end of the noun instead of using a separate word before it.

The -et marks the definite singular of a neuter noun.

So:

• et hovedhjul = a main wheel
• hovedhjulet = the main wheel

This is one of the first big noun patterns learners meet in Norwegian:

• masculine: en bil → bilen
• neuter: et hus → huset

Here, hjul is a neuter noun:

• et hjul
• hjulet

And in the compound:

• et hovedhjul
• hovedhjulet

That -s- is a linking element used in some Norwegian compounds. It does not usually have a separate meaning by itself; it helps connect the parts of the compound.

So:

• ledning
  • floke → ledningsfloke

This is similar to the linking -s- seen in many Scandinavian and Germanic compounds.

Important point: you cannot always predict perfectly when the linking -s- appears, so it is often best to learn compounds as whole words. Still, you will see this pattern often enough that it becomes familiar over time.

Because Norwegian often expresses the by adding an ending to the noun.

In English:

• the wheel
• the tangle

In Norwegian:

• hjulet
• floken

So the sentence does not need a separate word like English the.

This is very normal in Norwegian:

• boken = the book
• huset = the house
• bilen = the car

In this sentence, both nouns are definite:

• ledningsfloken
• hovedhjulet

Blokkerer is the present tense of the verb å blokkere.

So:

• infinitive: å blokkere = to block
• present tense: blokkerer = blocks / is blocking

A useful feature of Norwegian is that the present tense does not change by person:

• jeg blokkerer
• du blokkerer
• han/hun blokkerer
• vi blokkerer

So unlike English, you do not need a special -s only for he/she/it. The same present-tense form is used for all subjects.

No, this sentence has very straightforward subject–verb–object word order:

• Ledningsfloken = subject
• blokkerer = verb
• hovedhjulet = object

So it matches normal English order quite closely:

• The cable tangle blocks the main wheel

This makes the sentence relatively easy for an English speaker to follow.

The likely dictionary forms are:

• en ledningsfloke
• å blokkere
• et hovedhjul

And in the sentence they appear as:

• ledningsfloken = definite singular of en ledningsfloke
• blokkerer = present tense of å blokkere
• hovedhjulet = definite singular of et hovedhjul

This is useful because when looking up Norwegian words, you usually want the indefinite singular noun or the infinitive verb.

A few things in hovedhjulet may stand out to an English speaker:

• hj at the start of hjul: in standard Norwegian, the h is usually silent, so it sounds roughly like yul
• j in Norwegian is like English y
• the final -et is an unstressed definite ending

So hjulet sounds roughly like YOO-let, and hovedhjulet is roughly HOO-vehd-yoo-let in a broad English-style approximation.

This is only an approximation, but the most important pronunciation point is:

• hjul does not sound like English h-jool
• it is closer to yool

Yes, but it would change the meaning slightly.

Compare:

• Ledningsfloken blokkerer hovedhjulet.
  = The cable tangle blocks the main wheel.

• En ledningsfloke blokkerer et hovedhjul.
  = A cable tangle blocks a main wheel.

The version in your sentence uses the definite forms, which suggests that the speaker has particular, identifiable things in mind:

• a specific tangle
• a specific main wheel

That is why -en and -et are used.

It is understandable and structurally normal, but it does sound a bit technical or mechanical, mainly because of the vocabulary:

• ledningsfloke sounds like a problem involving cables or wires
• hovedhjul sounds like a specific part in a machine or mechanism
• blokkerer is also a fairly formal/technical verb compared with a simpler everyday verb like stopper

So grammatically it is very normal Norwegian, but the overall tone feels like something from:

• a repair manual
• a technical report
• a machine description