25/966100
  • Brand
    PARKER
  • Article
    25/966100
  • Machine system
    Hydraulic system
  • Part type
    Load holding valve
  • Machine brand
    JCB
  • Manufacturing type
    OEM
  • All the features
In stock
0.00 ₺
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Lock valve 25/966100 is an OEM part made by Parker for the JCB machines.

The load holding (counterbalance) valve fits on the load-bearing side of a cylinder: with the control in neutral it blocks the oil and holds the load, and when operated it opens under pilot pressure for a slow, smooth descent. If a hose bursts, it stops the boom or load dropping uncontrolled, making it an important safety element. A faulty valve lets the load creep down, causes jerky movements or stops the arm being lowered. The cartridge is supplied new with a factory setting. Load holding valves are fundamental to the safety of lifting machines, so they are replaced only with the same part number. The setting is chosen above the cylinder pressure at full load. The valve sits in the block on the cylinder and protects against a hose burst. The valve is made of steel.

Specifications


Part number25/966100
ManufacturerParker
Production typeOEM
Part typeLoad holding valve
System / groupHydraulic system
Machine makeJCB

Compatibility

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

Fitting

Do not alter the valve setting; replace it only with a valve of the same part number. Check the sealing after fitting.

Specifications

  • Machine system
    Hydraulic system
  • Part type
    Load holding valve
  • Machine brand
    JCB
  • Manufacturing type
    OEM
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JCB 3CX / 4CX 07/10/2026 52
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 41
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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