332/D1079
  • Article
    332/D1079
  • Machine system
    Hydraulic system
  • Part type
    Check valve
  • Machine brand
    JCB
  • Manufacturing type
    Aftermarket
  • Compatibility
    JCB 3CX, 4CX, 5CX
  • All the features
In stock
0.00 ₺
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For the JCB 3CX and 4CX backhoe loaders: check valve 332/D1079, an aftermarket part. The card also lists 332/D7251.

Inside a check valve is a spring and a poppet that the spring holds against its seat; when oil pressure overcomes the spring, the valve opens, and in the reverse direction pressure keeps it shut. The opening pressure is set by the spring, so a valve with a different spring changes how the circuit works. When fitting, renew the joint seals and check the flow direction against the mark on the body, since a check valve fitted the wrong way shuts the line completely. The aftermarket valve has the connection dimensions and opening pressure of the original, while the genuine valve comes with the setting JCB specifies. The valve comes new with its O-rings fitted.

Specifications


Part number332/D1079
Cross / alternative numbers332/D7251
Production typeAftermarket
Part typeCheck valve
System / groupHydraulic system
Machine makeJCB

Compatibility

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

Fitting

After changing the valve, run the related function through its full stroke several times to bleed the circuit. Check the valve joint again after the first hours of work, since a slight leak can mean an O-ring has not seated properly.

Specifications

  • Machine system
    Hydraulic system
  • Part type
    Check valve
  • Machine brand
    JCB
  • Manufacturing type
    Aftermarket
  • Compatibility
    JCB 3CX, 4CX, 5CX
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JCB 3CX / 4CX 07/10/2026 49
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 40
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.
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