In the heavy machinery sector, downtime translates directly into financial loss.

The only way to maintain on-site efficiency for the world's most preferred heavy machinery—JCB 3CX, JCB 4CX, JCB 214E, and JS series excavators (JS145W, JS160W, JS200W)—is through the correct spare parts and original reference code matching. In this comprehensive guide, we technically analyze over 500 critical parts, ranging from transmissions to engines, sensor technology to electrical systems.

1. Transmission and Powertrain: The Center of Movement

Torque transmission and gear shifting precision in JCB machines depend on the micron-level fit of parts within the transmission system.

Transmission Solenoids and Gear Control

Especially for machines in the 1992-1993 model range, solving gear shifting issues requires the use of the correct coils.

• 25/105200-X: JCB Transmission Forward Gear Solenoid. Provides a high magnetic field with 12V operating voltage.

• 332/M5111: FNR (Forward-Neutral-Reverse) transmission coil. Features precise switching capacity.

• 25/221054, 25/221145: Transmission control valve coils.

• 25/103300, 25/104800: Powershift transmission solenoid groups.

Sealing Technology (O-Rings and Seals)

Pressure drops in the transmission pump cause the machine to lose traction.

• 904/50024, 445/09402, F03/18378: Transmission pump sealing rings and input shaft seals.

• 904/50033, 904/50040, 904/50047: Rear and front axle hub seals.

• 828/00196, 828/00451: Hydraulic tank and transmission cover sealing elements.

Shaft Joints and Spiders (U-Joints)

High torque-resistant spiders measuring 32x95.2 mm are used to transmit power to the wheels without vibration.

• 914/82201, 914/80303, 914/82103, 914/82603: Shaft and axle spider kits.

• 10/901802, 10/901801: Rear shaft joint groups.

• 914/86403, 914/86601, 914/83304: Heavy-duty propshaft spiders.

2. Engine and Turbocharger Group: Dieselmax Power

In JCB Dieselmax and Perkins engines, the tightening torque of every bolt and the heat resistance of every gasket are vital.

Cylinder Block and Fasteners

The structural integrity of the engine is ensured by studs manufactured from high-tensile steel.

• 1317/3318Z: Cylinder block lower body (Bedplate) bolt. Secures the lower block bearing the crankshaft to the main body.

• 320/03001, 320/03008: Crankshafts.

• 320/04133, 320/04134: Main bearing and connecting rod bearing sets.

Turbocharger Assembly and Sealing

A small air leak in turbo units can mean up to 30% power loss.

• 320/04208: Turbine (Turbo) gasket.

• 320/06007, 320/A6017: M8x75 exhaust manifold and turbo connection studs.

• 826/11384: M10x37 turbo mounting stud.

• 320/06047, 320/06078, 320/06159: Turbocharger units.

3. Sensors, Switches, and Electronic Control

Sensors, the "nervous system" of the machine, provide instant data to the operator and protect the machine.

Pressure and Temperature Monitoring

• 320/04046, 320/A4146, 320/04038: Engine oil pressure sensors and switches.

• 701/80322: Automatic transmission (AKPP) oil pressure sensor.

• 701/71300, 701/54900: Transmission oil temperature sensors (5/8" UNF AMP connector).

• 701/33500, 701/80145: Water temperature and overheating sensors.

Level and Fluid Quality Sensors

• 32/925709: Fuel filter water sensor. Detects water in fuel to protect injectors.

• 332/H3476, 123/08053, 123/06187, 32/925278: Hydraulic tank level and fuel level floats.

4. Electrical System and In-Cabin Controls

Operator comfort and signal management directly affect the machine's field performance.

Relays and Switching Units

• 716/30149, 332/C3148, 716/23900, 721/12543: 12V Micro relays and fuse box control elements.

• 475/51090, 701/D0529, 701/E0001, 701/58833: Panel switches and gear selection buttons.

Keycaps and Panel Ergonomics

• 701/58825: Beacon light keycap.

• 701/58826: Front work light control key.

• 701/80184, 701/60001: Instrument panel and ignition switch sets.

Why Choose Parts with Original References?

When selecting parts for JCB construction machinery, the accuracy of codes (e.g., 25/105200-X or 320/04046) is essential for the electronic and mechanical health of the system. A wrong sensor or a poor-quality solenoid can lead to irreversible damage in high-cost units like transmissions.

All parts provided through our site are fully compatible with the OEM codes listed above and have passed durability tests for heavy-duty conditions.

Please feel free to contact us for wholesale spare parts inquiries or technical code verification.