Грузовой лифт находится внизу.

Грузовой means freight, cargo, or for carrying goods.

So грузовой лифт is a freight elevator or service elevator, not a regular passenger elevator.

It comes from груз = load / cargo.

Because the correct adjective is грузовой. Some Russian adjectives are formed in ways that are not fully predictable from the noun alone, so you simply learn the adjective as a vocabulary item.

• груз = load, cargo
• грузовой = freight, cargo-related

In this sentence, грузовой is masculine singular nominative because it describes лифт, which is masculine singular.

Лифт means elevator or lift.

So:

• British English: lift
• American English: elevator

In Russian, лифт is the normal everyday word.

Находится means is located, is situated, or literally is found.

So the sentence is very naturally understood as:

• The freight elevator is downstairs
• The freight elevator is located downstairs
• The freight elevator is at the bottom / below

Russian often does not use есть to mean simple is in the present tense.
Also, находится sounds more specific and location-focused than a simple zero-copula sentence.

Compare:

• Грузовой лифт внизу. = The freight elevator is downstairs.
  (shorter, more conversational)
• Грузовой лифт находится внизу. = The freight elevator is located downstairs.
  (slightly more explicit or formal)

Yes, находится is a reflexive verb form, ending in -ся.

The verb is находиться, which often means to be located.

For learners, it is best to treat находиться as its own vocabulary item meaning:

• to be located
• to be situated

You do not need to interpret the reflexive ending literally here. In modern Russian, this verb is commonly used as a standard way to express location.

Внизу means down below, downstairs, at the bottom, or below, depending on context.

In this sentence, the most natural translations are:

• downstairs
• below
• on the lower level

So Грузовой лифт находится внизу suggests that the freight elevator is on a lower floor or at the bottom level.

Because внизу is a fixed adverb meaning below / downstairs / at the bottom.

It is written as one word.

This is important:

• внизу = adverb, down below / downstairs
• not a normal phrase with в + noun

So in this sentence, внизу is simply an adverb of place.

In this sentence, внизу is best understood as an adverb, so it is not functioning like a regular noun in a case form.

That is why it is useful to learn it as a whole word meaning:

• downstairs
• below
• at the bottom

A beginner might expect в to be followed by a noun in the prepositional or accusative case, but here внизу is a fixed adverbial form.

This is the most neutral word order:

• Грузовой лифт = the subject
• находится = the verb
• внизу = the location

So it is basically:

[subject] + [verb] + [place]

Russian word order is flexible, but this version sounds natural and standard.

Other orders are possible, but they change emphasis:

• Внизу находится грузовой лифт.
  = Downstairs is the freight elevator.
  (emphasizes the location)

• Грузовой лифт внизу.
  = shorter, less formal

Russian has no articles like a or the.

So Грузовой лифт can mean:

• a freight elevator
• the freight elevator

The exact meaning depends on context.

In many real situations, this sentence would naturally mean the freight elevator, because both speakers already know which elevator is being discussed.

A native speaker might very well say the shorter version:

Грузовой лифт внизу.

That is more conversational and direct.

The full version with находится is still correct and natural, but it can sound a little more formal, descriptive, or explanatory.

A natural stress pattern is:

Грузово́й лифт нахо́дится внизу́.

Main stresses:

• грузово́й
• нахо́дится
• внизу́

Hearing and repeating the stress is important, because Russian stress is not fixed and must often be learned word by word.

Yes. Depending on context, внизу can mean:

• downstairs
• below
• at the bottom
• down there

For example, it could refer to:

• a lower floor in a building
• the bottom of a shaft
• a lower part of a page or screen
• a place below the speaker

In this sentence, because it is about an elevator, downstairs or below is the most likely meaning.