Horn 704/37300 JCB, aftermarket

401/L8899

Brand
SET PARTS
Article
401/L8899
Machine system
Electrics
Part type
Horn
Machine brand
JCB
Manufacturing type
Aftermarket
All the features

In stock

0.00 ₺

We do not publish prices: they depend on exchange rates and change often. Click «Request price» and we will quote the current price on the day you ask.

Check the exact specifications and compatibility with your machine with our managers.

We are available Monday to Saturday, 9:00 – 18:00; closed on Sunday.

Free delivery to the carrier of your choice, or collect your order in Istanbul.

Could not find the part you need? Write to us and we will help you find an alternative or order it from the manufacturer.

Message on WhatsApp Message on Telegram Call us: +90 531 224 49 66

Horn 704/37300 is an aftermarket part for the JCB machines. The card also lists 335/B4669, 401/L8899.

The horn is an electromagnetic sound signal that lets the operator warn people nearby, a basic part of safety on site and on the road. A coil inside vibrates a diaphragm to produce a loud sound. The horn is worked by a button on the column switch or panel, and on some machines it is fed through a relay. If the horn does not work, check the fuse, relay, button and earth first; a weak or rasping sound may mean water has got inside or the diaphragm is damaged. On many sites the horn, together with the reversing alarm, is among the items checked in safety inspections. The horn is chosen for voltage, since a 12 V horn soon burns out on a 24 V system.

Specifications

Part number	704/37300
Cross / alternative numbers	335/B4669, 401/L8899
Production type	Aftermarket
Part type	Horn
System / group	Electrics
Machine make	JCB

Compatibility

The catalogue also has the genuine version of this part. Other parts are in Beacons.

Fitting

Moisture and corrosion inside the connector are a common cause of false signals from sensors and switches, so clean the connector and use contact spray if needed. Renew the connector seal if it is missing. The part is chosen by part number, and its connector type is compared with the old part.

Specifications

Machine system
Electrics
Part type
Horn
Machine brand
JCB
Manufacturing type
Aftermarket

Questions: 0

No questions about this product.

07/10/2026 67

JCB 3CX and 4CX wiring diagrams before and after May 2009: sheets and component keys

Section C of the JCB service manual (publication 9803/3290-15) gives the JCB 3CX and 4CX backhoe loader wiring diagram in two versions: one for machines built up to May 2009 with analogue instruments and one for machines from May 2009 with the digital instrument panel. On the earlier machines the main machine circuit takes two sheets, with separate circuits for the gearboxes and options; the later circuit runs to 15 sheets. Below are the main sheets, the component keys and a guide to reading wire numbers.

07/10/2026 37

JCB 3CX / 4CX Electrics: Fuses, Relays, Battery, Alternator and Starter Motor Tests

Section C of the JCB service manual (publication 9803/3290-15) covers the electrical system of JCB 3C, 3CX and 4CX backhoe loaders: fuses and relays, circuit diagrams for machines of different build years, battery, alternator and starter motor testing, the wire numbering system, harness repair, earth points and harness drawings. The PDF has 402 pages, most of them harness drawings.