COGENG 721/12347 72112347 Universal Main Wiring Harness | Direct OEM Replacement for JCB 3CX 4CX Backhoe Loaders

PRODUCT IDENTIFICATION

CROSS REFERENCE GUIDE

TECHNICAL SPECIFICATIONS

Electrical Specifications

Material Construction

Environmental Ratings

COMPATIBLE JCB BACKHOE LOADERS

Compatible Models & Production Eras

Universal Harness Key Features for 3CX/4CX

Optional Circuit Integrations

This universal harness includes provisions for specialized JCB systems across different production eras:

Note: This universal main harness is designed to cover multiple JCB 3CX and 4CX production eras (T0: 1980-2007, T4i: 2005-2021). Refer to the JCB Parts Catalog or consult the official Service Manual for exact connector configurations for your specific serial number. Contact COGENG with your machine serial number for compatibility confirmation and any required adapter notes.

HARNESS COMPONENTS & CIRCUITS

Main Circuit Groups

Installation decomposition diagram
Park backhoe loader on level ground, lower boom and stabilizers completely
Turn ignition OFF and remove key from all switches
Disconnect negative battery terminal first, then positive terminal
Wait 10 minutes for system capacitors to discharge
Photograph and label all existing harness connections and routing
Installation Steps:
Carefully remove old harness using proper terminal release tools
Verify new COGENG harness matches original configuration exactly
Route harness following documented factory path
Secure all mounting clamps and retention points properly
Connect all components ensuring positive connector engagement
Verify adequate clearance from moving parts and heat sources
Post-Installation Testing:
Reconnect battery and initialize system
Perform complete diagnostic system scan
Test all electrical functions through full operational cycle
Verify proper hydraulic, transmission, and control system operation

Frequently Asked Questions
A. When will get the items after I place order?
Q. Once your payment is confirmed,we will arrange the goods within 1~4 days; if not in stock, we will inform you before placing the order?

A. If I only know the excavator model, but can not offer parts No.,what should I do ?
Q. If possible, you can send us pictures of old products, nameplate or the size for reference.

A. How can you guarantee the quality??
Q. We will 100% test the goods before delivery. We also support video inspection.

A. How long will it take to delivery to my address??
Q. The normal delivery time is 3-7 days, depending on which country you are in.?

A : Which delivery method will you choose?
Q : By sea, air or express(DHL,Fedex,TNT, UPS, EMS etc.)，Sometimes we will arrange as the customer's demand.

A: What's package? Can you give me the package according my requirement??
Q. We usually packed by standard exported box or carton. And yes we can pack as per your requirement.

A: Can the price be cheaper?
Q: Of course, you will be offered a good discount for a big amount.

A: Why should I choose to buy from you?
Q:Our advantages: 100% quality assurance, develop and manufature follow original ones;Quick response within 24 hours; Small order allowed;Reasonable stock and timely delivery;Neutral packing, customized packing are allowed. Positive customer feedback from abroad market;Excellent after-sales service.
A : Which payment terms can you accept?
Q : Paypal. Western Union, Bank Transfer, T/T...

Contact COGENG

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