Ruble krankla birlikte dönüyor.

It means together with the crank.

• krank = crank
• -la = with
• birlikte = together

So krankla birlikte is a very natural way to say together with the crank.

A little literally, yes, but it is completely normal Turkish.

• krankla by itself can mean with the crank
• birlikte adds the idea of together / along with

So krankla birlikte strongly emphasizes that the two things are moving together. Turkish often uses this combination:

• X ile birlikte
• X’le birlikte
• X’la birlikte

All of these mean together with X.

Both are possible.

• krank ile birlikte
• krankla birlikte

The second one is just the shorter, more attached form. In Turkish, ile often turns into a suffix-like ending:

• araba ile → arabayla
• çocuk ile → çocukla
• krank ile → krankla

So krankla is simply the more compact form of krank ile.

Dönüyor comes from the verb dönmek, which means to turn, rotate, revolve.

It breaks down like this:

• dön- = verb stem
• -üyor / -yor = present continuous ending

So dönüyor means is turning, is rotating, or sometimes just turns, depending on context.

Because the sentence is probably describing motion happening now, is turning / is rotating is the most natural understanding.

Because Turkish normally puts the main verb at the end.

So the structure here is:

• Ruble = subject
• krankla birlikte = accompanying phrase
• dönüyor = verb

That gives:

Ruble + together with the crank + is turning

This verb-final order is one of the most important differences from English.

Yes. Ruble is the subject, and dönüyor is the verb describing what it is doing.

So grammatically, the sentence is saying:

Ruble + is turning
and it is doing so together with the crank.

Turkish does not have an English-style definite article like the.

A bare noun like Ruble can mean:

• the ruble
• a ruble
• just ruble

Which one is intended depends on context.

So the sentence does not need a separate word for the.

Yes. Turkish word order is flexible, although the verb usually stays at the end.

For example:

• Ruble krankla birlikte dönüyor.
• Krankla birlikte Ruble dönüyor.

Both are possible, but the emphasis changes a little.

• Starting with Ruble makes Ruble the topic.
• Starting with Krankla birlikte puts more focus on the idea of together with the crank.

Yes, depending on context.

The -yor form is mainly the present continuous, so it often means:

• is turning
• is rotating

But in some contexts it can also describe what something is doing in a general present situation.

Still, if you are describing a machine or part in motion right now, is turning is usually the best interpretation.

Yes, you could, and it would still be understandable.

• Ruble krankla dönüyor = Ruble is turning with the crank
• Ruble krankla birlikte dönüyor = Ruble is turning together with the crank

The version with birlikte sounds a bit fuller and emphasizes the idea of moving together more clearly.

Not necessarily.

In Turkish, just like in English, the first word of a sentence is capitalized. So Ruble is capitalized anyway because it comes first.

That means capitalization alone does not prove it is a proper noun here.