Unloader valve 25/222834 JCB 3CX/4CX, aftermarket

25/222834

Brand
INTER
Article
25/222834
Machine system
Hydraulic system
Part type
Unloader valve
Machine brand
JCB
Manufacturing type
Aftermarket
Compatibility
JCB 3CX, 4CX
All the features

In stock

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For the JCB 3CX and 4CX backhoe loaders: unloader valve 25/222834, an aftermarket part.

The valve is a cartridge type that screws into its cavity on the pump or valve block, with a factory setting. Its body may carry the maker's marks and setting data. To diagnose it, measure the unloading pressure and the flow of each pump section separately. The aftermarket valve matches the original in cavity, thread and setting. An unloader fault can show as the engine bogging down and smoking black while digging; the same sign appears with fuel system faults, so the decision is made on hydraulic pressure readings. The valve is supplied new. The aftermarket valve comes with its O-rings fitted; oil them before fitting. The valve is made of steel. The valve is supplied new with a factory setting.

Specifications

Part number	25/222834
Production type	Aftermarket
Part type	Unloader valve
System / group	Hydraulic system
Machine make	JCB

Compatibility

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

Fitting

Relieve pressure, remove the valve and clean the cavity; oil the new valve's O-rings and tighten it to the specified torque. Start the engine and check engine speed under load and the unloading pressure.

Specifications

Machine system
Hydraulic system
Part type
Unloader valve
Machine brand
JCB
Manufacturing type
Aftermarket
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).

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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.