35/901800
  • Brand
    JCB
  • Article
    35/901800
  • Machine system
    Hydraulic system
  • Part type
    Priority valve
  • Machine brand
    JCB
  • Manufacturing type
    Original
  • Compatibility
    JCB 3CX, 4CX
  • All the features
In stock
0.00 ₺
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Priority valve 35/901800 is a genuine JCB part for the JCB 3CX and 4CX backhoe loaders.

The priority valve makes pump oil go to the steering circuit first; once the steering demand is met, the remaining flow goes to the loader and backhoe functions. This keeps the steering light and safe even during heavy hydraulic work. A faulty priority valve makes the steering heavy, slows its response or slows the hydraulic services. The valve is supplied new. On JCB backhoe loaders the priority valve sits between the pump outlet and the valve block and feeds the steering unit line. Its spool responds to the load signal from the steering unit and sets aside the flow the steering needs; when the wheel is not turned, almost all the flow goes to the hydraulic services. The port letters on the body guide the connections. The valve has a cast iron body and comes with its ports capped. Compare the port threads with the old valve.

Specifications


Part number35/901800
ManufacturerJCB
Production typeOriginal
Part typePriority valve
System / groupHydraulic system
Machine makeJCB

Compatibility

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

Fitting

After assembly, check the priority function by using the steering and hydraulic services at the same time.

Specifications

  • Machine system
    Hydraulic system
  • Part type
    Priority valve
  • Machine brand
    JCB
  • Manufacturing type
    Original
  • Compatibility
    JCB 3CX, 4CX
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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.
Useful articles 05/10/2026 35
Heavy steering on a JCB 3CX/4CX: causes and checks
If the steering of a backhoe loader has become heavy, do not rush to replace the steering unit: the cause is often simpler. Here is the order to check things in, from tyres to track rods. The data comes from the JCB service manual for 3C, 3CX and 4CX backhoe loaders.
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