Komatsu Part COMPRESSOR ASS' 423-S62-4330

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Product Overview

The 423-S62-4330 COMPRESSOR ASS' is a genuine Komatsu OEM replacement compressor assembly from the 423 prefix series. The air conditioning compressor is the heart of your machine's climate control system — it compresses refrigerant gas and circulates it through the condenser, expansion valve, and evaporator to remove heat from the cab air. On a hot day on a construction site or in a mine, a working air conditioner isn't a luxury — it's essential for operator comfort, concentration, and safety during long shifts.

Part Number: 423-S62-4330 Part Name: COMPRESSOR ASS' Part Type: OEM Komatsu Replacement Component Availability: In stock — ready to ship

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Signs Your Compressor Needs Attention

AC compressor problems typically announce themselves before complete failure. The most common early sign is reduced cooling — the cab doesn't get as cold as it used to, or takes longer to cool down after start-up. This can be caused by low refrigerant charge (from a slow leak elsewhere in the system), but it can also indicate the compressor is wearing internally and not pumping efficiently. Unusual noise from the compressor — grinding, rattling, or knocking — indicates internal mechanical problems. A compressor clutch that doesn't engage when the AC is turned on can be an electrical problem (bad clutch coil, wiring, or pressure switch) or a mechanical problem (seized compressor). And visible refrigerant oil around the compressor shaft seal or housing joints indicates a leak that will eventually lead to refrigerant loss and compressor failure from inadequate lubrication.

Before replacing the compressor, have a qualified technician diagnose the system. Low refrigerant or a failed pressure switch produces the same symptoms as a bad compressor, and replacing the compressor without fixing the root cause wastes money if the new compressor is damaged by the same condition.

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When to Replace

Replace the 423-S62-4330 when the compressor has seized or makes grinding noise indicating internal mechanical failure; when the shaft seal is leaking refrigerant oil; when the compressor clutch has failed and is not available as a separate service part; or when the compressor's pumping efficiency is below specification and cannot be restored through service.

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Installation

1. Confirm 423-S62-4330 in your Komatsu parts catalog
2. Recover refrigerant from the system using approved recovery equipment — never vent refrigerant to atmosphere
3. Remove the old compressor — note belt routing and all mounting bracket positions
4. Install the new compressor with the correct amount of refrigerant oil — drain and measure oil from old compressor to determine how much to add
5. Install new O-rings on all refrigerant line connections lubricated with clean refrigerant oil
6. Evacuate the system with a vacuum pump to remove air and moisture
7. Recharge with the correct refrigerant type and quantity
8. Test operation — verify cooling performance and check connections for leaks

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