Hydraulic tank hose 834/11566 JCB 3CX/4CX, aftermarket

834/11566

Brand
OKKS
Article
834/11566
Machine system
Hydraulic system
Part type
Hydraulic tank hose
Machine brand
JCB
Manufacturing type
Aftermarket
Compatibility
JCB 3CX, 4CX
All the features

In stock

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Hydraulic tank hose 834/11566 is an aftermarket part for the JCB 3CX and 4CX backhoe loaders. The card also lists 332/Y9145.

Moulded tank hoses take up less space than straight hose and keep their cross-section even on tight bends, which keeps flow resistance in the suction line low. Over time hot hydraulic oil and engine bay heat harden the rubber, and a hardened hose loses its seal under the clamp. To change the hose, bring the tank oil level below the hose connection or drain the tank. After fitting the new hose, refill the tank, start the engine and check the hose and clamps for leaks. Keep dirt out of the tank openings during the job, since dirt in the hydraulic system speeds up pump and valve wear. The hose is chosen by part number and compared with the old one for shape, diameters and branches. It is made of rubber that resists hydraulic oil and heat. The hose comes new and is kept in its packaging until fitting.

Specifications

Part number	834/11566
Cross / alternative numbers	332/Y9145
Production type	Aftermarket
Part type	Hydraulic tank hose
System / group	Hydraulic system
Machine make	JCB

Compatibility

Other parts are in Hydraulic pipes.

Fitting

Route the hose so it does not touch moving parts or hot surfaces. Do not reuse the old clamps.

Specifications

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

Questions: 0

No questions about this product.

JCB 3CX / 4CX 07/10/2026 41

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.

Useful articles 07/10/2026 38

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.