Disassembling the refrigerator compressor: from theory to practice with photos and diagrams

The compressor is the “heart” of the refrigerator, and its failure often seems like a death sentence for old equipment. However, in 80% of cases, the fault can be diagnosed independently, and sometimes it can be fixed without calling a technician. It is possible to disassemble a refrigerator compressor Samsung, Atlant or Indesit releases of the 1990–2010s even without special education, if you act carefully and with an understanding of the principles of the system.

This article is not about how to “fix everything in 5 minutes”, but about a conscious approach: from preparing tools to testing windings with a multimeter. We will analyze when disassembly is justified, and when it is better to immediately look for a replacement, what parts inside the compressor can be restored, and why some “folk” repair methods (for example, knocking on the housing) only aggravates the problem. If your refrigerator hums but does not freeze, or the compressor turns off 5 seconds after starting, here you will find a checklist for diagnostics.

⚠️ Important: Working with a compressor involves high refrigerant pressure and electricity. If you are not confident in your skills, limit yourself to external inspection and diagnostics with a multimeter - entrust the rest to a specialist with equipment for vacuuming and refilling freon.

1. When disassembling the compressor is justified: symptoms and diagnostics

Before you start disassembling, make sure that the problem is in the compressor. Typical signs of its malfunction:

• 🔊 The compressor hums, but does not start —the sound of operation is heard, but the refrigerator does not cool. More often, the starting relay or interturn short circuit of the windings is to blame.
• ⏱️ Short-term switching on (1-5 seconds) with subsequent shutdown. Triggers thermal protection due to overheating or high current.
• 💨 The compressor works, but does not pump freon —the tubes do not heat up, the condenser is cold. Valve failures or piston jamming are possible.
• 🔥 Constant overheating of the housing (the hand does not tolerate touch). The reason is wear of the bearings or lack of oil.

A multimeter is enough for initial diagnosis. Check:

1. Winding resistance (between terminals C-S, C-R, S-R). The norm for most models: 20–50 Ohm (working), 10–30 Ohm (starting), 30–70 Ohm (total). Deviations of more than 20% are a sign of malfunction.
2. The resistance between the case and the terminals must be ∞ (breakdown to the body = danger of electric shock!).

If tests show a malfunction, and the refrigerator is older than 15 years, think about: the cost of a new compressor (from 5,000 ₽) + work of a master (from 3,000 ₽) can exceed the price of a used refrigerator of the same brand. Disassembly is justified if:

• 🔧 You plan to use the parts (for example, oil or valves) for another project.
• 🔄 You want to understand the cause of the breakdown for prevention in the future.
• ♻️ You are recycling equipment and need to drain the oil/freon according to the rules.

2. Preparation: tools and safety

To disassemble the compressor you will need:

⚠️ Safety is paramount total:

⚠️ Attention: The compressor remains freon (even in a non-working refrigerator) and oil under pressure. When cutting pipes, wear safety glasses gloves - a stream of oil may escape with force. Carry out work outdoors or in a well-ventilated area: freon vapors are toxic.

Before you start:

Unplug the refrigerator at least 12 hours in advance|Drain the water from the drainage system|Prepare a container for oil (volume ~0.5 l)|Cover the floor with cardboard or rags|Prepare a marker for marking the pipes-->

If the compressor is still “alive”, but working unstable before disassembling, try replacing the starting relay - in 30% of cases this solves the problem without opening. The relay costs 500–1,500 rubles and is attached to the compressor with two bolts.

3. Step-by-step disassembly: from the housing to the piston group

The compressor disassembly process is conventionally divided into 3 stages: external dismantling, opening the case and disassembling internal components. Let's look at each in detail.

Stage 1: Removing the compressor from the refrigerator

1. Unplug the refrigerator and move it away from the wall.

2. Remove the back cover (usually secured with latches or screws).

3. Find the compressor - it’s a black “barrel” with pipes and a relay. Disconnect starting relay (unscrew the bolts, disconnect the terminals).

4. Snack with a pipe cutter suction (thick, usually with a filter) and discharge (thin) tubes at a distance of 10–15 cm from the compressor. Do not cut closely - you can damage the valves!

5. Unscrew 3-4 bolts securing the compressor to the frame and carefully remove it.

Step 2: Opening the compressor housing

The compressor housing is sealed and sealed. To open it:

1. Place the compressor in a vice vertically (tubes up) or clamp it between the boards.
2. Use a hacksaw to make a cut along the seam of the body (usually visible as a thin line). The cutting depth is 2–3 mm.
3. Carefully split the body with a hammer and chisel, starting from the top. Do not hit the tubes!
4. Drain the oil into a prepared container. In old compressors it can be up to 400 ml.

⚠️ Attention: If freon remains inside the compressor, when opened, the housing may “shoot out” scraps of metal. To avoid this, before sawing drill a small hole (∅2–3 mm) in the upper part of the body to relieve pressure.

Step 3: Disassembling internal components

After opening you will see:

• 🔩 Electric motor with a rotor and stator.
• 🛢️ Piston group (piston, connecting rod, crankshaft).
• 🔄 Valve plate (metal plate with holes).

For further disassembly:

1. Unscrew the electric motor mounting bolts (usually 3-4 pcs.).
2. Remove the valve plate - it can be screwed or pressed by springs.
3. Remove the piston with connecting rod. Assess the condition rings (should not be chipped) and bushings (there should be no play).

What to do if the piston jammed?

If the piston does not move even after removing the valve plate, do not hit it with a hammer! Pour kerosene or WD-40 and leave for 2-3 hours. Then carefully loosen the piston with pliers. If it doesn’t help, the compressor needs to be replaced: repairs will cost more than a new unit.

4. Diagnostics of faults: what can be repaired?

After disassembly, inspect the key components:

The most common breakdowns that can be fixed by yourself:

• 🔧 Oil change are if it is blackened or chips are visible in it. Use synthetic oil for compressors (for example, Emkarate RL 32H or Mobil Gargoyle Arctic Oil).
• 🔄 Cleaning the valves - remove carbon deposits from the valve plate with fine sandpaper (grain 1000–1500).
• 🛠️ Replacing the starting capacitor - if the compressor hums but does not start, the capacitor capacity is indicated on the relay label.

⚠️ Attention: If it is found interturn short circuit in the windings (resistance between the terminals ≤ 5 Ohm or tends to zero), repair is impractical. Rewinding the windings at home is impossible - special equipment and skills are required.

5. Assembly and testing: how to avoid mistakes

You need to assemble the compressor in in reverse order, but taking into account the nuances:

1. Check the gaps: between the piston and there should be a gap in the cylinder 0.05–0.1 mm (checked with a feeler gauge). If the gap is larger, the cylinder needs to be bored.
2. Install new gaskets: old seals (especially under the valve plate) are losing elasticity.Use paronite gaskets or silicone sealant.
3. Fill the oil: fill in fresh oil to the level 1/3–1/2 from the height of the case For refrigerators. on R134a or R600a is suitable POE oil.
4. Solder the case: use argon welding or high-temperature solder (for example, POS-40). Ordinary solder will not withstand pressure.

After assembly, the compressor needs to be tested:

1. Connect it to starting relay and supply power 220V via residual current device (RCD).
2. Measure current consumption by clamps. Norm for most models: 0.8–1.5 A in operating mode, 2–3 A at startup.
3. Check the pressure on the discharge tube with a pressure gauge. It should be 8–15 bar (depending on the model).

⚠️ Attention: If the compressor works after repair, but the refrigerator does not freeze, the problem may be freon leakage or clogging of the capillary tube. To refill freon you need vacuum pump and manometric manifold —without them, repairs are pointless.

6. Alternatives to repair: when it is easier to buy a new compressor

Repairing a compressor is not always justified. Consider alternatives if:

• 💰 The cost of repairs exceeds 50% of the price of the refrigerator. For example, for Atlanta MHM-1705 (price ~15,000 ₽) a new compressor (Danfoss NL6) will cost 6,000–8,000 ₽ + work.
• ⏳ The refrigerator is over 20 years old. In older models (ZIL, Orsk, Nord), spare parts are almost impossible to find, and energy consumption is 2-3 times higher than modern ones.
• ☠️ The stator windings are burned out. Rewinding in a workshop costs 3,000–5,000 ₽, but there is no guarantee that the compressor will last long.

If you decide to replace the compressor, choose a model with the same parameters:

• Refrigerant type (for example, R134a or R600a).
• Cooling capacity (indicated on the nameplate, for example, 120 W).
• Oil type (for R600a - only POE).

Popular analogues for Soviet refrigerators:

When replacing the compressor, be sure to:

1. Flush the system freon or alcohol to remove moisture and chips.
2. Replace filter drier (costs ~300 ₽).
3. Vacuum the system 15–20 minutes before refilling freon.

7. Disposal of an old compressor: rules and useful ones. life hacks

If the compressor cannot be repaired, it must be disposed of in compliance with environmental standards. The following remains inside:

• 🛢️ Oil (300–500 ml) - can be used to lubricate other mechanisms (for example, door hinges).
• ⚗️ Freon —even in a non-working refrigerator, its residues are dangerous for the ozone layer. Hand over the compressor to scrap metal collection points with a license for the disposal of refrigerants.
• 🧲 Copper —tubes and windings contain up to 1–1.5 kg of copper. Scrap price ~500–700 RUR/kg (for 2026).

How to prepare the compressor for disposal:

1. Drain the oil through the service station valve or after sawing the body.
2. Cut through all the copper tubes with a pipe cutter - this will make it easier to access copper during processing.
3. Remove the starting relay - it has a capacitor, which is also sold separately.

⚠️ Attention: According to the law (Federal Law No. 89 “On Production and Consumption Waste”), throw it away compressor with remaining freon in a regular trash container impossible. Fine for individuals - up to 2,000 rubles. Take it to specialized points (for example, EcoSystem or Megalom).

8. Common mistakes and how to avoid them

Even experienced craftsmen make mistakes when disassembling compressors. Here are the most common:

A few more anti-advicethat are floating around the forums:

• ❌ "Hit the compressor with a hammer - and it will work!" → This can temporarily move a jammed piston, but will lead to damage valves.
• ❌ "Fill with freon without vacuuming" → Moisture will remain in the system, which will freeze in the capillary tube.
• ❌ "Use car oil instead of compressor oil" → Car oil is not compatible with freon and destroys rubber seals.

FAQ: Answers to frequently asked questions

Is it possible to disassemble a compressor without cutting off the tubes?

Theoretically, yes, but in practice it is almost impossible. The tubes are soldered to the compressor housing high-temperature solder, and it will not be possible to unsolder them without damaging the housing. An alternative is to use special puller for service valves (costs ~2,000 rubles), but it is only suitable for modern models with detachable connections.

How to check if the compressor is working after repair?

Connect the compressor to the network via starting relay i measure:

1. Current consumption (should be 0.8–1.5 A in operating mode).
2. Pressure on the discharge tube (should rise to 8–15 bar in 10–20 seconds).
3. Casing temperature (should be 50–70°C, but not higher 90°C).

If the compressor starts, but the pressure does not increase - the problem is in valves or piston rings.

What to do if after assembly the compressor does not start?

Check:

• 🔌 Correct connection of the windings (starting and working windings should not be mixed up).
• 🔧 State of the starting relay (often burns out during a short circuit).
• 🛢️ Oil level (if there is a shortage, the compressor overheats and turns off).
• 🔍 Gaps between the piston and cylinder (if the gap is too large, the compressor does not create pressure).

If the compressor hums but does not rotate, it is likely the piston is jammed or the winding burned out.

Is it possible to use a compressor from an old refrigerator for other purposes?

Yes! Old compressors are often converted into:

• 🔨 Compressors for paint guns (a receiver and a pressure switch are needed).
• 💨 Pumps for inflating wheels (requires modification of valves).
• 🌬️ Homemade sandblasting machines (suitable for compressors with a power of 1 kW).

For such projects, the compressor needs modify: installed pressure switch, pressure gauge and water separator. Without modifications, the compressor from the refrigerator is not suitable for pneumatic tools - it is not designed for long-term operation without stopping.

How much oil should be poured into the compressor after repair?

The volume of oil depends on compressor models:

• For compressors with power 80–120 W (for example, Danfoss NL6) — 300–350 ml.
• For power 150–200 W (for example Embraco EG120) — 400–450 ml.

⚠️ Important: The oil should be same typeas original (indicated on the compressor nameplate). You cannot mix mineral and synthetic oil!