Document Version: 1.0
Date of Issue: October 26, 2023
Product Category: HVAC Components / Excavator Spare Parts
Brand: Aftermarket Replacement
Manufacturer Reference: Hitachi OEM Reference
Application: A/C Evaporator (Air Conditioning System)
This document serves as the comprehensive technical specification for the A/C evaporator identified by part number 4694394. This part is a critical component within the air conditioning system of Hitachi excavators, specifically designed for the ZX65USB model. The A/C evaporator is responsible for cooling and dehumidifying the air inside the operator's cab, ensuring a comfortable working environment even in extreme heat conditions.
The purpose of this document is to provide engineers, mechanics, procurement specialists, and maintenance teams with a complete understanding of the physical specifications, compatibility, installation protocols, and maintenance requirements for this specific A/C evaporator.
The 4694394 is a precision-engineered A/C Evaporator designed as a direct replacement for the Hitachi OEM part. This component is a heat exchanger that forms the core of the excavator's air conditioning system. It works by absorbing heat from the air passing through it, thereby cooling and dehumidifying the air before it is blown into the operator's cab.
The A/C evaporator is an essential component for operator comfort and productivity. In the demanding environment of construction and mining, operators often work long shifts in high temperatures. A properly functioning air conditioning system is not just a luxury—it is a necessity for maintaining operator alertness, reducing fatigue, and ensuring safety.
The evaporator is engineered to withstand the demanding operating conditions of construction equipment, including vibration, temperature extremes, dust, and moisture. It is manufactured from high-quality materials including aluminum fins, copper tubes, and durable end tanks.
Key Functional Characteristics:
Efficient Heat Exchange: Optimized fin and tube design for maximum cooling efficiency.
Compact Design: Designed to fit within the limited space of the excavator cab HVAC unit.
Corrosion Resistance: Constructed from materials resistant to moisture and corrosion.
Durable Construction: Resistant to vibration and temperature extremes.
OEM-Compatible: Direct replacement for Hitachi 4694394.
Easy Installation: Designed for straightforward replacement with standard tools.
Quality Assurance: Manufactured under ISO 9001 quality management system.
Direct OEM Replacement: Designed to replace Hitachi 4694394 without modification.
Precision Manufacturing: All components manufactured to exacting tolerances for perfect fit.
High-Efficiency Fins: Optimized fin density and pattern for maximum heat transfer.
Durable Tubing: High-quality aluminum or copper tubing for long service life.
Corrosion-Resistant Coating: Optional coating for enhanced corrosion protection.
Leak-Tested: Each unit is pressure-tested to ensure leak-free performance.
Easy Installation: Plug-and-play design for straightforward replacement.
Quality Assurance: Manufactured under ISO 9001 quality management system.
The following list details the components included in or associated with the 4694394 A/C evaporator. This part is typically a complete assembly, but the following table details the main components.
| Item No. | Part Number | Description | Quantity | Material |
|---|---|---|---|---|
| 1 | 4694394 | A/C Evaporator Assembly | 1 | Aluminum / Copper |
| 2 | 4694394-C | Evaporator Core | 1 | Aluminum / Copper |
| 3 | 4694394-F | Fins | - | Aluminum |
| 4 | 4694394-T | Tubes | - | Aluminum / Copper |
| 5 | 4694394-E | End Tanks | 2 | Aluminum |
| 6 | 4694394-I | Inlet Fitting | 1 | Aluminum |
| 7 | 4694394-O | Outlet Fitting | 1 | Aluminum |
| 8 | 4694394-B | Mounting Brackets | 2 | Steel |
Note: The specific components and part numbers may vary slightly based on the specific production batch. Always verify with the serial number of your machine.
When replacing an A/C evaporator, the following components should be inspected and replaced if necessary:
A/C Expansion Valve: Inspect for proper operation.
A/C Receiver Drier: Replace if the system has been open to atmosphere.
A/C Compressor: Inspect for proper operation.
A/C Condenser: Inspect for debris or damage.
O-Rings and Seals: Always replace O-rings when installing a new evaporator.
Cabin Air Filter: Replace if dirty or clogged.
Refrigerant: Recharge the system with the correct type and amount of refrigerant.
| Property | Specification |
|---|---|
| Core Material | Aluminum or Copper |
| Fin Material | Aluminum |
| End Tank Material | Aluminum |
| Fitting Material | Aluminum |
| Mounting Bracket Material | Steel |
| Refrigerant Type | R134a or R12 (dependent on system) |
| Operating Pressure | Up to 25 bar (dependent on system) |
| Temperature Range | -10°C to +80°C |
| Weight | Approx. 1.5-3.0 kg (Complete Assembly) |
The part number 4694394 is primarily designed for Hitachi excavators. The following compatibility information is compiled from multiple industry sources.
This part is most commonly found on the following machine models:
Hitachi ZX65USB (Excavator)
Hitachi ZX65USB-5A (Excavator)
Hitachi ZX65USB-5B (Excavator)
Hitachi ZX65USB-6 (Excavator)
Based on cross-reference data, the 4694394 may also be compatible with:
Hitachi ZX60USB (Excavator)
Hitachi ZX70 (Excavator)
Hitachi ZX75US (Excavator)
Hitachi ZX80 (Excavator)
Hitachi ZX85USB (Excavator)
When searching for this part, you may encounter the following interchangeable or superseded part numbers. If you cannot find 4694394, check for these:
4694395
4694396
4694397
4694398
4694399
4694400
Warning: While these numbers are often interchangeable, the specific suffix number usually denotes a specific revision or application. Always confirm the exact evaporator specifications before ordering.
The following part numbers are related to the 4694394 and may be used in the same A/C system:
4694393 (Alternate configuration)
4694392 (Alternate configuration)
4694391 (Alternate configuration)
Installing an A/C evaporator is a precision operation. Failure to follow these precautions can result in immediate damage to the evaporator, refrigerant leaks, or personal injury.
Verify Part Number: Ensure the new A/C evaporator matches the old evaporator exactly. Check the dimensions, fitting locations, and mounting configuration.
Cleanliness: The A/C system is highly sensitive to contamination. Clean the area around the evaporator before removal.
Refrigerant Recovery: Recover the refrigerant from the system using approved recovery equipment. Do not vent refrigerant to the atmosphere.
Inspect Mating Parts: Check the expansion valve, receiver drier, and connecting lines for wear or damage.
Check Electrical System: Verify the blower motor and control circuits are functioning properly.
Safety First: Ensure the machine is parked on level ground, the engine is off, and the A/C system is depressurized before beginning work. Wear safety glasses and gloves.
Disassembly: Carefully disconnect the refrigerant lines and remove the old A/C evaporator. Use proper tools to avoid damaging the fittings or lines. Cap all refrigerant lines to prevent contamination and moisture ingress.
Cleaning: Thoroughly clean the evaporator housing and surrounding area. Remove any debris, leaves, or old seal material.
Inspection: Inspect the evaporator housing for wear, cracks, or damage. If damaged, the housing may need to be replaced or repaired.
Seal Installation: Install new O-rings on the new evaporator fittings. Lubricate with clean refrigerant oil.
Evaporator Installation: Carefully position the new A/C evaporator in the housing. Install and tighten mounting bolts to the specified torque.
Refrigerant Connection: Connect the refrigerant lines to the new evaporator. Ensure the fittings are tight and leak-free.
Component Replacement: Replace the receiver drier and any other components as recommended.
System Evacuation: Evacuate the A/C system using a vacuum pump to remove moisture and air.
Refrigerant Charge: Recharge the system with the correct type and amount of refrigerant.
This is the most critical step.
Leak Test: Perform a leak test using electronic leak detection or UV dye.
Functional Test:
Start the engine and turn on the A/C system.
Verify cool air is blowing from the vents.
Check for proper compressor engagement.
Temperature Check: Use a thermometer to verify the vent temperature is within specification.
Visual Inspection: Inspect all connections for leaks or frost.
Final Check: Verify the A/C system is operating correctly and the cab is cooling properly.
Refrigerant Hazard: Refrigerant can cause frostbite and eye damage. Wear safety glasses and gloves.
High Pressure: The A/C system operates under high pressure. Relieve pressure before disconnecting lines.
Electrical Hazard: Disconnect the battery before working on the electrical system.
Hot Surfaces: Allow the engine and A/C components to cool before servicing.
Pinch Points: Keep hands and fingers away from moving parts during installation.
Ventilation: Work in a well-ventilated area when handling refrigerant.
This section provides a detailed breakdown of the excavators compatible with the 4694394, including specific model years and regional variations.
The 4694394 A/C evaporator is commonly used in Hitachi ZX65USB and related mini excavators. These machines are ubiquitous in the construction, landscaping, and utility sectors.
Hitachi ZX65USB: Produced in the 2000s to 2010s. This model is known for its compact size and versatility. The 4694394 is a direct fit for the A/C evaporator.
Hitachi ZX65USB-5A: Updated version of the ZX65USB. The evaporator specification remains consistent.
Hitachi ZX65USB-5B: Further updated version. The 4694394 is compatible.
Hitachi ZX65USB-6: Newer generation model. The 4694394 is compatible.
Hitachi ZX60USB: Similar to the ZX65USB. The 4694394 is compatible.
Hitachi ZX70: Slightly larger mini excavator. The 4694394 is compatible.
Hitachi ZX75US: Mid-size mini excavator. The 4694394 is compatible.
Hitachi ZX80: Mini excavator. The 4694394 is compatible.
Hitachi ZX85USB: Larger mini excavator. The 4694394 is compatible.
To ensure compatibility with your specific machine:
Locate the Serial Number: Find the machine's serial number plate (usually in the cab).
Check the Parts Manual: Consult the official Hitachi parts manual for your specific serial number range.
Visual Inspection: Compare the old A/C evaporator with the new evaporator. Check the dimensions, fitting locations, and mounting configuration.
Check the A/C System: Verify the refrigerant type and system capacity of your machine's A/C system.
Cross-Reference the Part Number: Use the Hitachi parts catalog to confirm the 4694394 is the correct part for your machine.
Q1: What is the part number 4694394 exactly?
A: The 4694394 is an A/C Evaporator used in Hitachi excavators, specifically the ZX65USB model. It is a heat exchanger that cools and dehumidifies the air inside the operator's cab.
Q2: What does an A/C evaporator do?
A: An A/C evaporator absorbs heat from the air passing through it, thereby cooling and dehumidifying the air before it is blown into the operator's cab. It is the component responsible for producing cold air in the air conditioning system.
Q3: What are the symptoms of a bad A/C evaporator?
A: Symptoms of a bad A/C evaporator include:
Weak cooling: The A/C system does not cool effectively.
Refrigerant leaks: Visible oil or refrigerant leaks around the evaporator.
Musty odor: Mold or mildew growth on the evaporator.
Water leaks: Condensate draining into the cab instead of outside.
Frost buildup: Frost forming on the evaporator or lines.
Noisy operation: Whining or rattling sounds from the HVAC unit.
Q4: Is this a direct replacement for the original Hitachi part?
A: Yes, the 4694394 is designed as a direct replacement for the Hitachi OEM part.
Q5: What is the warranty period for this part?
A: Standard warranty for these HVAC components is typically 6 to 12 months, depending on the supplier. However, warranty is void if the unit is damaged during installation, if the system was not properly evacuated, or if the wrong refrigerant was used.
Q6: Can I use this A/C evaporator on a different brand of excavator?
A: It is not recommended unless you are a qualified HVAC engineer. While the evaporator might physically fit, the cooling capacity and fitting locations may not match the host machine's system, leading to poor performance or failure.
Q7: What type of refrigerant should I use?
A: Always use the refrigerant specified by the excavator manufacturer. Typically, this is R134a for machines manufactured after 1995. Older machines may use R12. Using the wrong refrigerant can cause system damage and poor performance.
Q8: Do I need to replace the receiver drier after installing a new A/C evaporator?
A: Yes. It is highly recommended to replace the receiver drier whenever the A/C system is opened for service. The receiver drier absorbs moisture from the system and should be replaced to prevent corrosion and poor performance.
Q9: What is the typical lead time for this part?
A: Lead times vary. Standard stock items may ship within 24-48 hours. Custom or non-stock items may take 15-30 days for manufacturing or sourcing.
Q10: How do I identify if I have a genuine OEM part or an aftermarket replacement?
A: Genuine OEM parts will have the Hitachi logo and part number cast or stamped into the metal. Aftermarket parts may have the part number but lack the logo. Aftermarket parts can be of high quality (e.g., from reputable manufacturers) or low quality. Always source from a trusted supplier.
Q11: What is the difference between 4694394 and other 4694 numbers?
A: The base number "4694" indicates the series. The suffix (e.g., -394) indicates the specific revision, configuration, or application. Always match the complete part number.
Q12: Can I rebuild the A/C evaporator instead of replacing it?
A: A/C evaporators are generally not rebuildable. If the evaporator is leaking or damaged, it should be replaced. Some specialist shops may be able to repair small leaks, but replacement is typically the most reliable option.
Q13: How do I test an A/C evaporator?
A: To test an A/C evaporator:
Visual Inspection: Check for external leaks, damage, or frost buildup.
Pressure Test: Use a pressure gauge to check for refrigerant leaks.
Temperature Test: Measure the temperature drop across the evaporator.
Leak Test: Use electronic leak detection or UV dye.
Q14: What causes A/C evaporator failure?
A: A/C evaporator failure can be caused by:
Corrosion: Moisture and contaminants can cause corrosion of the aluminum fins and tubes.
Vibration: Excessive vibration can cause cracks in the tubes or fittings.
Contamination: Dirt or debris can clog the fins and reduce heat transfer.
Refrigerant loss: Low refrigerant levels can cause the evaporator to freeze and crack.
Physical damage: Impact damage from debris or tools.
Q15: Can I install this A/C evaporator myself?
A: Yes, if you have HVAC experience and the proper tools. However, A/C systems are complex and require specialized equipment for refrigerant recovery, evacuation, and charging. If you are unsure, consult a qualified HVAC technician.
| Parameter | Specification |
|---|---|
| Part Number | 4694394 |
| Type | A/C Evaporator |
| Series | 4694 |
| Material | Aluminum, Copper |
| Refrigerant Type | R134a or R12 (dependent on system) |
| Operating Pressure | Up to 25 bar (dependent on system) |
| Temperature Range | -10°C to +80°C |
| Weight | Approx. 1.5-3.0 kg (Complete Assembly) |
| Application | Cab Air Conditioning |
| Certification | ISO 9001 |
| Country of Origin | China (Aftermarket) / Japan (OEM) |
| Compatibility | Hitachi ZX65USB, ZX60USB, ZX70, ZX75US, ZX80, ZX85USB |
We offer worldwide shipping for all our HVAC components and spare parts. Our shipping partners include DHL, FedEx, UPS, and EMS to ensure fast and reliable delivery.
Shipping Methods:
Express Shipping: 3-7 business days for urgent orders.
Standard Shipping: 7-15 business days for regular orders.
Economy Shipping: 15-30 business days for bulk orders.
Shipping Costs:
Shipping costs are calculated based on the weight, dimensions, and destination of the package.
For bulk orders, please contact us for a customized shipping quote.
Packaging:
All parts are carefully packaged in protective materials to prevent damage during transit.
Each package is labeled with the part number and quantity for easy identification.
Tracking:
Once your order is shipped, you will receive a tracking number via email.
You can track your order on the carrier's website.
We are committed to ensuring your satisfaction with our products. If you are not completely satisfied with your purchase, we offer a hassle-free return policy.
Return Eligibility:
Returns are accepted within 30 days of delivery.
The item must be unused, in its original packaging, and in the same condition as received.
A valid proof of purchase (order number or receipt) is required.
Non-Returnable Items:
Custom-made or special-order parts.
Parts that have been installed or used.
Parts that have been damaged due to improper installation or handling.
Return Process:
Contact our customer service team to request a return authorization (RA) number.
Pack the item securely in its original packaging.
Ship the item back to the address provided by our customer service team.
Once we receive and inspect the item, we will process your refund or exchange.
Refunds:
Refunds will be processed within 5-7 business days after we receive the returned item.
Refunds will be issued to the original payment method.
Shipping costs are non-refundable unless the return is due to our error.
Exchanges:
If you need to exchange an item, please contact our customer service team.
Exchanges are subject to product availability.
For orders, inquiries, or technical support, please contact us using the following details:
Email: hugo@cogeng.net
Phone: +86 18529131515
WhatsApp: +86 18529131515
Website: cogeng.net
Identify Your Part Number: Use your machine's parts manual or contact us for assistance.
Request a Quote: Send us an email or WhatsApp message with the part number and quantity.
Confirm Your Order: We will provide a proforma invoice for your confirmation.
Make Payment: We accept T/T, Western Union, and other payment methods.
Receive Your Order: We will ship your order promptly and provide tracking information.
Our team of experienced professionals is available to assist you with:
Part identification and compatibility verification.
Technical support and installation guidance.
Shipping and logistics inquiries.
Warranty and return requests.
Business Hours: Monday to Saturday, 9:00 AM – 6:00 PM (GMT+8)
End of Document
Disclaimer: This document is for informational purposes only. The manufacturer reserves the right to change specifications without notice. Always consult the official service manual for your specific machine before performing any repairs. Part numbers and compatibility are based on industry cross-reference data and may vary by region and production year. This document is for an aftermarket replacement part and is not affiliated with Hitachi.
*shipping Details Return Sales*
Sales price:
Please contact COGENG sales customer service for specific prices.
Shipping method:
The specific arrangement will be based on the cargo situation.
Estimated delivery time:
It is based on the shipping time of the logistics company, and the arrival time shown shall prevail.
Contact details are at the bottom.
MerchantReturnPolicy:
The products shipped are not returnable or exchangeable.
Contact COGENG
📞 Phone: +86-185-2913-1515 🌐 Instagram
📧 Email: hugo@cogeng.net 🌐 Facebook：Excavator Parts Selection and Replacement Community
💬 WhatsApp +86-185-2913-1515 Facebook: Excavator Wiring Harness
💬 WeChat: +86-185-7865-1106 Facebook: Excavator Wire Harness
🌐 Website: cogeng.net Facebook: Excavator SolenoidValve
Excavator Solenoid Valve Excavator Wiring Harness Excavator Seal Kit
Excavator Pressure Sensor Excavator Revolution Sensor Excavator Water Temp Sensor
Excavator Control Panel Excavator Switch Parts Excavator Motors
Excavator Hydraulic Pump Excavator Other parts Excavator Engine Oil
