Backhoe control valve 25/615600 JCB 3CX/4CX, OEM Husco

25/615600

Brand
Husco
Article
25/615600
Machine system
Hydraulic system
Part type
Control valve
Machine brand
JCB
Manufacturing type
OEM
Compatibility
JCB 3CX, 4CX
Machine series
3CX, 4CX
All the features

In stock

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Backhoe control valve 25/615600 is an OEM part made by Husco for the JCB 3CX and 4CX backhoe loaders. The card also lists 25/624300, 25/613700.

The valve block is the heart of the machine's hydraulic system; its pressure settings come factory-set and are verified by measuring after fitting. The control linkages are adjusted so the spools make their full stroke. The ARVs on the block protect each cylinder line from pressure spikes. Husco makes the control valves for JCB backhoe loaders, and the OEM Husco block has the same design as the JCB-numbered block. Its sections serve the boom, dipper, bucket, slew, stabilisers and, where fitted, the extending dipper and auxiliary attachment line. The slew section may carry extra valves that cushion the side-to-side swing. The block is supplied new. The OEM block has the same lever connections and port threads as the JCB-numbered block. The block comes with its ports capped and the spool ends protected.

Specifications

Part number	25/615600
Cross / alternative numbers	25/624300, 25/613700
Manufacturer	Husco
Production type	OEM
Part type	Control valve
System / group	Hydraulic system
Machine make	JCB
Series / model	3CX, 4CX

Compatibility

The catalogue also has the genuine version (option 1) and genuine version (option 2) of this part. Other parts are in Hydraulic control valves.

Fitting

Mark the hoses and pipes and relieve pressure before removing the block. Connect the new block with new O-rings and check the oil and filter; on first start, slowly run every service through its full stroke to purge air and then measure the pressures.

Specifications

Machine system
Hydraulic system
Part type
Control valve
Machine brand
JCB
Manufacturing type
OEM
Compatibility
JCB 3CX, 4CX
Machine series
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.

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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.