Backhoe control valve 25/615600, genuine, option 2

25/615600

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

In stock

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For the JCB 3CX and 4CX backhoe loaders: backhoe control valve 25/615600, a genuine JCB part. The card also lists 25/624300, 25/613700.

The spools are matched to the body with very small clearances, so spool and body are assessed together, and when the body wears the block is usually replaced complete. When replacing it, compare the section count, spool types and ports with the old block. Dirty hydraulic oil is the most common cause of scored and sticking spools. This block is the second genuine option for the same number, with the same internals, section count and ports. Confirm the cause by measurement before replacing the valve: creep under load can come from a cylinder seal, an ARV or a spool. If the cylinder does not leak internally and the ARV is sound, the creep points to spool wear. Check the control linkage pins and bushes during the swap, as slack linkages stop the spools making a full stroke. The block is supplied new. The part number label on the block body helps compare it with the old one. The block comes with its ports capped. The spool ends are protected in transit.

Specifications

Part number	25/615600
Cross / alternative numbers	25/624300, 25/613700
Manufacturer	JCB
Production type	Original
Part type	Control valve
System / group	Hydraulic system
Machine make	JCB

Compatibility

The catalogue also has the genuine version and OEM version of this part. Other parts are in Hydraulic control valves.

Fitting

If the oil is dirty, clean the tank and renew the oil along with the block change, or the new spools will soon be scored.

Specifications

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

Questions: 0

No questions about this product.

JCB 3CX / 4CX 07/10/2026 50

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.