The COGENG Wiring Harness Set includes multiple premium OEM-grade wiring harnesses specifically engineered for JCB JS145LC and JS220 excavators equipped with the Isuzu 6HK1 diesel engine. This comprehensive harness set covers critical machine electrical systems including engine control, cab electronics, hydraulic controls, chassis systems, and sensors. Manufactured to meet or exceed original JCB and Isuzu specifications, these durable, plug-and-play harnesses ensure reliable electrical performance, optimal signal integrity, and long service life in demanding construction and excavation applications.
| Parameter | Harness 1 | Harness 2 | Harness 3 | Harness 4 | Harness 5 | Harness 6 |
|---|---|---|---|---|---|---|
| COGENG Part Number | GG 721/112522 |
GG 332/J13663 |
GG 332/J13254 |
GG 332/K2954 |
GG 332/K8925 |
GG 332/K0486 |
| OEM Equivalent | JCB 721/112522 | JCB 332/J13663 | JCB 332/J13254 |
JCB 332/K2954 |
JCB 332/K8925 |
JCB 332/K0486 |
| Product Type | Main Harness | Engine Harness | Cab Harness | Chassis Harness | Sensor Harness | Control Harness |
| Application | Complete machine | Engine systems | Cab electronics | Chassis & hydraulics | Sensors & actuators | Control circuits |
| Compatible Models | JS145LC, JS220 | JS145LC, JS220 | JS145LC, JS220 | JS145LC, JS220 | JS145LC, JS220 | JS145LC, JS220 |
| Engine Compatibility | Isuzu 6HK1 | Isuzu 6HK1 | Isuzu 6HK1 | Isuzu 6HK1 | Isuzu 6HK1 | Isuzu 6HK1 |
| Brand | Part Number |
|---|---|
| COGENG | GG721/112522, GG332/J13663, GG332/J13254, GG332/K2954, GG332/K8925, GG332/K0486 |
| JCB | 721/112522, 332/J13663, 332/J13254, 332/K2954, 332/K8925, 332/K0486 |
| Interchange | 721/112523, 332/J13664, 332/J13255, 332/K2955, 332/K8926, 332/K0487 |
| Parameter | Specification |
|---|---|
| Model | JCB JS145LC Excavator |
| Type | 14-ton Crawler Excavator |
| Series | JS Series |
| Engine | Isuzu 6HK1 |
| Displacement | 7.8L |
| Cylinders | 6-cylinder |
| Engine Power | 85-100 kW (114-134 HP) |
| Operating Weight | 14,000 - 15,000 kg |
| Parameter | Specification |
|---|---|
| Model | JCB JS220 Excavator |
| Type | 22-ton Crawler Excavator |
| Series | JS Series |
| Engine | Isuzu 6HK1 |
| Displacement | 7.8L |
| Cylinders | 6-cylinder |
| Engine Power | 110-125 kW (147-168 HP) |
| Operating Weight | 21,000 - 23,000 kg |
| Parameter | Specification |
|---|---|
| Engine Model | Isuzu 6HK1 |
| Displacement | 7.8L (7,790 cc) |
| Cylinders | 6 in-line |
| Bore x Stroke | 115mm x 125mm |
| Fuel System | Common rail (high pressure) |
| Emission Standards | Tier 3 / Stage IIIA |
| Applications | JCB JS145LC, JS220 excavators |
Note: Verify compatibility with your equipment model, engine serial number, and production year before ordering. Contact COGENG with your machine details for exact application verification.
| System | Components Connected |
|---|---|
| Main Controller | VCU / ECU interface |
| Power Distribution | Main fuse box, relays, battery |
| Engine Interface | CAN bus to engine ECU |
| Cab Systems | Display, switches, joysticks |
| Hydraulic Systems | Main control valve solenoids |
| Interface Connectors | To all other harnesses |
| Circuit Group | Components | Wire Specification |
|---|---|---|
| Main Power Distribution | Battery, alternator, main fuse box, starter relay | 4-6 AWG (battery) / 8-10 AWG (alternator) |
| Cab Power | Fuse panel, ignition switch, cab lights | 14-16 AWG |
| CAN Bus Communication | J1939 / VCU / ECU network | Shielded twisted pair |
| Interface Connectors | To engine, cab, chassis, sensor harnesses | 16-36 pin sealed |
| System | Components Connected |
|---|---|
| Engine Control (ECU) | Main ECU, power, ground, CAN bus |
| Fuel System | Injectors (6), fuel pump, rail pressure sensor |
| Timing System | Crank position sensor, cam position sensor |
| Air Intake | Boost pressure sensor, intake air temp sensor |
| Exhaust / EGR | EGR valve, temperature sensors |
| Charging System | Alternator, starter motor |
| Circuit Type | Components Connected | Wire Specification | Shielding |
|---|---|---|---|
| Engine Control (ECU) | Main ECU, crank sensor, cam sensor | Shielded 18-20 AWG | Yes |
| Fuel System | Injectors (6), fuel pump, rail pressure sensor | 14-16 AWG + shield | On sensors |
| Air Intake | Turbo actuator, MAF sensor, boost sensor | 18-20 AWG shielded | Yes |
| Exhaust / EGR | EGR valve, temp sensors | 18-20 AWG shielded | Yes |
| Cooling System | Fan motor, coolant temp sensor | 14-16 AWG (fan) + 20 AWG (sensor) | No |
| Charging System | Alternator, starter motor | 8-10 AWG (alternator) / 4-6 AWG (starter) | No |
| Connector Type | Location | Pins | Sealing |
|---|---|---|---|
| Isuzu OEM | Engine Control Module (ECU) | 48-60 pin | IP67 |
| Injector Connectors | Valve cover (6 injectors) | 2-pin each | IP67 |
| Deutsch DT | Crank/cam sensors | 3-pin | IP67 |
| AMP/Tyco | Alternator, starter | 2-pin + ring terminal | IP65 |
| Rail Pressure Sensor | Common rail | 3-pin | IP67 |
| Coolant Temp | Thermostat housing | 2-pin | IP67 |
| Oil Pressure | Engine block | 2-pin | IP67 |
| Interface Connector | To main harness (721/112522) | 24-pin sealed | IP67 |
| System | Components Connected |
|---|---|
| Cab Power | Fuse panel, ignition switch, cab lights |
| Instrumentation | Display unit, gauges, warning lights |
| Joystick Control | Pilot control signals (L/R joysticks) |
| Switch Panel | Wiper, lights, beacon, horn, A/C |
| Safety Systems | Seat switch, seatbelt, emergency stop |
| HVAC System | Climate controls, blower motor |
| Wiper / Washer | Windshield wiper motor, washer pump |
| Audio / Accessories | Radio, speakers, 12V outlet |
| Interface Connector | To main harness (721/112522) |
| System | Components Connected |
|---|---|
| Hydraulic Control | Main pump solenoids, control valve, pressure sensors |
| Swing System | Swing motor brake solenoid, swing sensors |
| Travel System | Travel motor brake solenoids (L/R), travel sensors |
| Lighting System | Work lights (boom, chassis, cab), beacon, tail lights |
| Safety Systems | Reverse alarm, travel alarm |
| Ground System | Chassis ground points |
| Interface Connector | To main harness (721/112522) |
| System | Components Connected |
|---|---|
| Hydraulic Sensors | Main pump pressure, pilot pressure, implement pressure |
| Temperature Sensors | Hydraulic oil temperature, coolant temperature |
| Position Sensors | Boom angle, arm angle, bucket angle |
| Level Sensors | Fuel level, hydraulic oil level |
| Speed Sensors | Engine speed, pump speed |
| Interface Connector | To main harness (721/112522) |
| System | Components Connected |
|---|---|
| Proportional Control | Pilot proportional solenoids |
| Attachment Control | Auxiliary hydraulic control (breaker, shear) |
| Fine Control Circuits | Precision control circuits |
| Diagnostic Interface | Service port, data link |
| Interface Connector | To main harness (721/112522) |
| Parameter | Specification |
|---|---|
| System Voltage | 24V DC (JCB/Isuzu standard) |
| Current Capacity | Up to 60A (main power circuits) |
| Wire Gauge Range | 16AWG - 20AWG (signal) / 10AWG - 14AWG (power) / 4AWG-6AWG (battery) |
| Insulation Resistance | ≥100MΩ @ 500V DC |
| Dielectric Strength | 1500V AC/60s No Breakdown |
| Voltage Drop | <0.5V @ rated load |
| Temperature Rating | -40°C to +125°C (engine bay) / -40°C to +105°C (cab/chassis) |
| Component | Material Specification |
|---|---|
| Conductor | High-purity tinned copper (99.9% OFC) |
| Wire Insulation | Heat-resistant XLPE / PVC / TPE |
| Outer Wrapping | Automotive-grade cloth tape / Corrugated conduit |
| Connector Housings | OEM-grade Nylon 66 / PBT (UL94 V-0) |
| Terminals | Tin-plated / Gold-plated brass |
| Grommets/Bushings | EPDM Rubber / Silicone (UV resistant) |
| Shielding | Aluminum foil + copper braid (sensor and CAN circuits) |
| Identification | Heat-shrink printed circuit labels (JCB/Isuzu-standard) |
| Parameter | Engine Bay Section | Cab/Chassis Section |
|---|---|---|
| Temperature Range | -40°C to +125°C | -40°C to +105°C |
| Ingress Protection | IP67 / IP69K | IP65 / IP67 |
| Vibration Resistance | 15G @ 50-1000Hz | 10G @ 50-500Hz |
| UV Resistance | 500+ hours | 500+ hours |
| Chemical Resistance | Diesel, oil, coolant, hydraulic fluid | Oil, hydraulic fluid |
| Salt Spray Resistance | 500+ hours | 500+ hours |
| Feature | Benefit |
|---|---|
| Complete 6-harness set | Full machine electrical coverage |
| OEM-Grade Materials | JCB/Isuzu spec wire, terminals, connectors |
| Model-Specific Fit | Exact routing for JS145LC/JS220 |
| Pre-Formed Branches | Matches factory routing paths |
| Color-Coded Wires | JCB/Isuzu-standard wire colors |
| Labeled Connectors | Circuit identification at every junction |
| 100% Tested | Every harness individually verified |
| Shielded Circuits | Critical sensor circuits fully shielded |
| Sealed Connectors | IP67/IP69K rated |
| Heat-shrink labeling | Permanent circuit identification |
| CAN bus specific | Proper twisted pair for J1939 |
| Symptom | Root Cause | COGENG Solution |
|---|---|---|
| No power / machine dead | Main power circuit failure | New heavy-gauge power cables |
| Engine cranks but no start | ECU communication failure | New CAN bus twisted pair |
| Engine runs rough / misfire | Injector circuit failure (6-cylinder) | New injector harness |
| Reduced power / derate | Sensor signal loss | New sensor circuits |
| No communication with ECU | CAN bus failure | New twisted pair CAN lines |
| Check engine light on | Multiple circuit faults | Complete harness replacement |
| Symptom | Root Cause | COGENG Solution |
|---|---|---|
| Blank / dead display | Cab power or CAN bus failure | New cab power circuits |
| Joystick no response | Broken signal wire | New pilot control circuits |
| Switches not responding | Broken switch circuit | New switch panel wiring |
| Wipers intermittent | Wiper motor circuit failure | New wiper control wiring |
| Symptom | Root Cause | COGENG Solution |
|---|---|---|
| No hydraulic response | Solenoid circuit failure | New solenoid circuits |
| Swing not working | Swing motor circuit failure | New swing control wiring |
| Travel issues | Travel motor circuit failure | New travel control wiring |
| Work lights not working | Lighting circuit failure | New power circuits |
| Symptom | Root Cause | COGENG Solution |
|---|---|---|
| Pressure sensor errors | Sensor circuit failure | New shielded sensor wiring |
| Attachment not working | Auxiliary control circuit failure | New control circuits |
| Intermittent operation | Loose sensor connections | New secure connections |
| Symptom | Root Cause | COGENG Solution |
|---|---|---|
| Rodent damage | Chewed wires | New complete harness set |
| Chafed / exposed wires | Rubbing against metal | New conduit protection |
| Corroded connectors | Moisture ingress | New sealed connectors |
| Burnt / melted wires | Overload, short, heat damage | New properly rated wires |
| Broken wires at connector | Vibration fatigue | New strain relief |
| Oil-soaked harness | Fluid contamination | New oil-resistant insulation |
| Order | Harness | Location | Estimated Time |
|---|---|---|---|
| 1 | 721/112522 (Main) | Central connection point | 1-2 hours |
| 2 | 332/J13254 (Cab) | Cab interior | 2-3 hours |
| 3 | 332/K2954 (Chassis) | Under cab, frame rails | 2-3 hours |
| 4 | 332/J13663 (Engine) | Engine bay | 2-3 hours |
| 5 | 332/K8925 (Sensors) | Engine, hydraulic systems | 1-2 hours |
| 6 | 332/K0486 (Control) | Control valve area | 1-2 hours |
| Total | Complete Set | All locations | 9-15 hours |
Q: What JCB models use this wiring harness?
A: The COGENG wiring harness is a direct OEM replacement for JCB part numbers 721/2522, 721/112522, 332/J13663, 332/J13254, 332/K2954, 332/K8925, and 332/K0486. These part numbers represent the same or functionally equivalent harnesses used across various JCB backhoe loaders, excavators, Loadall telehandlers, and other construction equipment. The multiple part numbers typically denote different revisions, supersessions, or cross-references within the JCB parts system. Always verify the specific part number against your machine's parts manual or original harness tag to confirm exact compatibility before ordering.
Q: What are the symptoms of a failing wiring harness on JCB equipment?
A: Common symptoms include intermittent electrical faults, multiple warning lights illuminated on the display panel, unresponsive hydraulic or transmission controls, erratic gauge or sensor readings, 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 construction environments.
Q: What is the relationship between these seven part numbers?
A: These seven part numbers (721/2522, 721/112522, 332/J13663, 332/J13254, 332/K2954, 332/K8925, 332/K0486) represent the same or functionally equivalent wiring harness across different JCB equipment models and production periods. The 721 prefix numbers and the 332 prefix numbers are often cross-references or supersessions of each other, with different prefixes indicating different JCB parts categorization systems. The COGENG harness is designed to be a direct replacement for all seven part number references.
Q: Is this harness a direct plug-and-play replacement?
A: Yes, the COGENG wiring harness is manufactured to exact OEM specifications for connector types, pin assignments, wire gauge, and routing length. It is a direct plug-and-play replacement requiring no wire splicing, soldering, or modifications when installed on compatible JCB equipment.
Q: What is the warranty coverage for this wiring harness?
A: COGENG provides a standard 12-month warranty against manufacturing defects from the date of installation. Proof of purchase and installation by a qualified technician are required. Warranty does not cover damage caused by improper installation, unauthorized modifications, rodent damage, or use on incompatible equipment.
Q: Does COGENG offer technical support for installation or troubleshooting?
A: Yes, COGENG provides complimentary technical support to assist with installation guidance and basic troubleshooting. For complex electrical diagnostics on JCB equipment, we recommend consulting a certified JCB service technician.
Q: How is the wiring harness protected during shipping?
A: Each COGENG wiring harness is individually packaged in a heavy-duty, moisture-resistant corrugated carton with custom foam inserts to prevent connector damage and wire kinking during transit. All connectors are capped and bagged for additional protection. Factory direct shipping ensures the product reaches you in optimal condition.
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