| Specification Category | Technical Details |
|---|---|
| Compatible Machine Models | JCB JS160, JCB JS200 Excavators |
| COGENG Part Number | CG-JCB-JS16-20-MWH08 |
| Replaces OEM Part Numbers | 721-11637, 721-12522 |
| Product Name | Main Wiring Harness Assembly |
| Application Scope | Complete electrical system integration including engine, hydraulic, and control systems |
| Wire Specifications | High-temperature resistant insulation (-40°C to 125°C), oil and abrasion resistant |
| Connector System | IP67 rated sealed connectors, OEM-equivalent specifications |
| Quality Assurance | 100% continuity, insulation resistance, and dielectric strength tested |
| Warranty Coverage | 2,000-hour limited warranty |
| NO | Number | Name | Qty |
| 1 | JHP0046 | Washer M10 | 1 |
| 2 | JHR0128 | Bolt | 2 |
| 3 | KHR0611 | Screw pan head | 4 |
| 4 | 1316/0305Z | Bolt High Tensile | 4 |
| 5 | 1316/0405Z | Screw M10 X 20 | 1 |
| 6 | 1316/9403Z | Screw M4X16 | 4 |
| 7 | 1420/0004Z | Washer M4 | 4 |
| 8 | 1420/0007Z | Washer (M8) | 4 |
| 9 | 6063/0008Z | Washer starlock | 1 |
| 10 | 242/00290 | Tie Panel Fixing Cable | 4 |
| 11 | 331/17400 | Bracket Earth Harness | 1 |
| 12 | 6012/0198Z | Screw pan head | 1 |
| 13 | 701/58826 | Actuator Switch Front Worklights | 1 |
| 13 | 701/E8826 | Actuator Front Working Lamps | 1 |
| 14 | 701/58853 | Cap decal,boom priority | 1 |
| 14 | 701/E8853 | Cover decal boom priority | 1 |
| 15 | 701/58855 | Decal mute,radio | 1 |
| 15 | 701/E8855 | Actuator etched mute | 1 |
| 16 | 701/58906 | Cover decal,cab interior | 1 |
| 16 | 701/E8906 | Actuator etched interior lamp | 1 |
| 17 | 701/60000 | Switch 12V | 1 |
| 18 | 701/60030 | Switch 24V | 1 |
| 18 | 701/E0030 | Switch 24V | 1 |
| 19 | 701/60031 | Panel Switch 24V | 1 |
| 19 | 701/E0034 | Switch 24V | 1 |
| 20 | 701/60041 | Switch 24V | 1 |
| 20 | 701/E0041 | Switch 24V | 1 |
| 21 | 701/80214 | Switch Redundancy locking | 1 |
| 22 | 716/30075 | Relay Stop solenoid | 1 |
| 22 | JHR0174 | Relay 24 volt | 3 |
| 23 | 717/12900 | Lighter cigarette 12 volt | 1 |
| 24 | 717/20154 | Convertor volt 24 volts to 12 volts | 1 |
| 25 | 722/10250 | Relay Stop solenoid | 1 |
| 26 | 721/11637 | Harness | 1 |
| 26 | 721/12522 | Harness | 1 |
| 27 | 701/80369 | Switch panel,fascia | 1 |
| 28 | 728/80073 | Unit EMS monitor Programmed | 1 |
| 29 | 728/80071 | Unit ECU1 Mk3 Programmed unit | 1 |
| 31 | 1391/3407D | Capscrew M10 x25mm | 3 |
| 32 | 1420/0008D | Washer (M10) | 3 |
| 33 | 728/80099 | Computer engine control | 1 |
| 34 | 2410/1209 | Grommet | 2 |
| 35 | 721/12060 | Harness cab engine Isuzu | 1 |
| 36 | 331/55578 | Bracket ECM mounting | 1 |
| 37 | 826/01281 | Capscrew button head | 4 |
| 38 | 1315/0405D | Setscrew M10 x 20 | 3 |
| 39 | 1420/0008D | Washer (M10) | 3 |
complete Power Shutdown: Turn off the excavator and disconnect all battery connections. Activate the main power isolation switch if equipped and wait at least 10 minutes for system capacitors to discharge completely
Thorough Pre-Installation Documentation: Photograph the existing harness routing, connector positions, and cable securing points from multiple angles for reference during installation
Careful Connector Handling: Release all locking mechanisms before disconnection. Pull only on connector housings, never on wires, to prevent terminal damage
Comprehensive Component Inspection: Examine all sensors, control units, and mating connectors for signs of wear, corrosion, or damage before installing the new harness
Precise Routing Installation: Follow the original factory routing exactly, ensuring the harness is properly seated in all clamps, guides, and protective conduits
Secure Connection Verification: Push each connector until audibly locked. Gently tug to confirm secure engagement and verify all weatherproofing seals are properly positioned
System Function Verification: Reconnect batteries and power up the system. Check for diagnostic codes and verify proper operation of all electrical functions before returning to service
Q: What are the symptoms of a failing wiring harness on this equipment?
A: Common symptoms include intermittent electrical faults, multiple warning lights illuminated on the monitor panel, unresponsive hydraulic or engine controls, erratic gauge or sensor readings, CAN bus communication errors, specific functions not responding, or unexpected machine shutdowns. Wiring harness degradation is often caused by prolonged heat exposure, vibration, moisture ingress, and connector terminal corrosion in demanding operating environments.
Q: What is the difference between the 721/11637 and 721/12522 harnesses?
A: In this two-harness set, the part numbers represent different harness sections that together form the machine's complete electrical system. Common configurations include one serving as the main chassis or cab harness and the other as the engine harness. Each harness handles distinct circuits and connectors, and both work together to ensure proper machine operation.
Q: Is this harness set a direct plug-and-play replacement?
A: Yes, each COGENG harness in this set is manufactured to exact OEM specifications for connector types, pin assignments, wire gauge, and routing length. They are direct plug-and-play replacements requiring no wire splicing, soldering, or modifications when installed on compatible equipment models.
Q: Do I need to replace both harnesses at the same time?
A: While individual harness replacement is possible, replacing both harnesses together as a complete set is recommended during major electrical system repairs. Harness degradation often affects multiple sections simultaneously, and installing both ensures all connectors mate properly with new terminals, eliminating potential weak points that could cause future electrical issues.
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
#ExcavatorWiringHarness #ExcavatorThrottleMotor #ExcavatorSolenoidValve #ExcavatorSealKit
