O desgaste estragou o carreto.

In Portuguese, nouns very often appear with an article when they refer to something specific.

• o desgaste = the wear / the wear and tear
• o carreto = the specific gear/pinion/reel part being talked about

English often drops the article in cases like wear damaged the gear, but Portuguese usually sounds more natural with the article here.

Estragou is the pretérito perfeito of estragar, 3rd person singular.

That means it corresponds to:

• it damaged
• it ruined
• it broke
• it spoiled

depending on context.

Here the subject is o desgaste, so estragou means the wear damaged/ruined it.

Because Portuguese normally follows the same basic word order as English here:

subject + verb + object

So:

• O desgaste = subject
• estragou = verb
• o carreto = direct object

Literally: The wear damaged the gear/component.

Yes, O desgaste estragou o carreto is a natural, standard order.

Portuguese can change word order for emphasis, but this neutral version is the most straightforward one. For example, putting o carreto first would sound more marked or emphatic, not the default.

So for normal statements, this order is exactly what a learner should expect.

They overlap, but they are not identical.

• estragar = to damage, ruin, spoil, make unusable or less good
• danificar = to damage, often a bit more formal/technical
• quebrar = to break
• partir = to break/split

So estragou is a broad, natural choice if the wear caused the part to stop working properly or become damaged. If the idea is specifically physical breakage, quebrou or partiu might be used instead. If the tone is more technical, danificou is also possible.

Yes. Desgaste is a noun related to desgastar.

• desgastar = to wear down
• desgaste = wear, wearing, wear and tear

This is a very common pattern in Portuguese: a verb and a related noun with similar meaning.

So if you know desgastar, it is easy to connect it to desgaste.

In this sentence, the article tells you:

• o desgaste → masculine
• o carreto → masculine

For carreto, the ending -o already strongly suggests masculine, which is common.

For desgaste, the ending -e does not reliably tell you the gender, so the best way is to learn the noun together with its article: o desgaste.

That is a very good habit in Portuguese in general.

In European Portuguese, rr is not pronounced like the English r. It is a stronger Portuguese r, produced farther back in the mouth/throat.

A rough pronunciation guide for the whole sentence is:

O desgaste estragou o carreto
≈ u dzh-GASHT uhsh-truh-GOH u kuh-REH-tu

That is only an approximation. A few important points:

• rr in carreto is a strong r
• unstressed vowels in European Portuguese are often reduced
• o as an article often sounds like u

So the sentence may sound more compressed than a learner expects from the spelling.

Yes, especially in a mechanical or technical context.

The structure is completely natural. The only thing that depends on context is carreto, because it is a somewhat technical word and can refer to different kinds of parts depending on the field or machine.

So:

• grammatically: very natural
• stylistically: normal in technical/mechanical speech
• vocabulary: context matters for exactly what carreto refers to

Not in normal Portuguese. That would sound very unnatural and incomplete.

Portuguese usually wants the articles here:

• o desgaste
• o carreto

You might see article omission in notes, labels, headlines, or very fragmented technical writing, but in a normal sentence you should keep them.

Because estragar is an -ar verb, and in the pretérito perfeito, the 3rd person singular ends in -ou.

So:

• eu estraguei
• tu estragaste
• ele/ela/você estragou

In this sentence, the subject is o desgaste, which is grammatically treated like ele (it), so estragou is the correct form.