Slew cylinder hose 612/26500 JCB 3CX/4CX, genuine

612/26500

Brand
JCB
Article
612/26500
Machine system
Hydraulic system
Part type
Hydraulic hose
Machine brand
JCB
Manufacturing type
Original
Compatibility
JCB 3CX, 4CX
All the features

In stock

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Slew cylinder hose 612/26500 is a genuine JCB part for the JCB 3CX and 4CX backhoe loaders.

A hydraulic hose carries pressurised oil between moving parts; it has an inner rubber tube, steel wire braid reinforcement and an outer cover, with crimped fittings at the ends. The slew cylinder hose flexes constantly as the arm swings side to side and so is prone to wear. A hose with a worn or bulging cover, or weeping at a fitting, must be replaced before it bursts, as a high-pressure oil jet can cause injury. The genuine hose is made to the length and pressure rating JCB specifies, with factory-crimped fittings. The print on the hose shows the pressure rating and production date, and old hoses should be replaced after a certain age even without visible damage. The hose is supplied new with its ends capped. The hose fittings and length are defined by the part number; check the old hose's marking when ordering.

Specifications

Part number	612/26500
Manufacturer	JCB
Production type	Original
Part type	Hydraulic hose
System / group	Hydraulic system
Machine make	JCB

Compatibility

The catalogue also has the aftermarket version of this part. Other parts are in High-pressure hoses.

Fitting

After fitting, check the joints for leaks under load, using a piece of card rather than your hand.

Specifications

Machine system
Hydraulic system
Part type
Hydraulic hose
Machine brand
JCB
Manufacturing type
Original
Compatibility
JCB 3CX, 4CX

Questions: 0

No questions about this product.

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JCB 3CX and 4CX hydraulic circuit diagrams by build year, with component keys

There is no single hydraulic circuit for the JCB 3CX and 4CX backhoe loader: it depends on the build year and the pump type. Section E of the JCB service manual (publication 9803/3290-14) gives separate circuits for the gear pump 3CX built before and after September 2007, for the variable flow 4CX (7-spool and 6-spool), and for the 3C-14 (214e) and 3C machines. Below you will find the circuits themselves, the component keys and some notes on tracing the oil flow through a circuit.

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JCB 3CX / 4CX Hydraulic Pressure: Settings, Pressure Testing and Causes of Low Pressure

On JCB 3CX and 4CX backhoe loaders with a gear pump, the working pressure of the hydraulic system is limited by the main relief valve in the loader valve: 236–241 bar on machines up to serial number 964124 and 248–252 bar on machines from serial number 964125 (standard and high-pressure hydraulics). It is checked with a 0–400 bar pressure gauge connected to the loader valve test point, with the engine at 1500 rev/min and the oil warmed to 50 °C. Below are the settings, the test procedure and the reasons why pressure drops, taken from the JCB service manual (Section E).

JCB 3CX / 4CX 07/10/2026 18

JCB 3CX / 4CX Hydraulics: Circuit Diagrams, Pumps and Relief Valve Pressures

Section E of the JCB service manual (publication 9803/3290-14) deals with the hydraulic system of the JCB 3C, 3CX and 4CX backhoe loaders. It brings together technical data for the pumps and valve blocks, hydraulic circuits for machines of different build years, valve operation, fault finding tables, and the procedures for pressure testing and for overhauling the pump, valves and rams. The section PDF runs to 302 pages.