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301.01.0009 Unloader Valve, Brake System
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301.01.0009 Unloader Valve for Case and Freightliner

301.01.0009

Summary

High-performance unloader valve designed for heavy-duty air brake systems. Features 3/4" - 14 NPTF port sizes and a cut-out pressure of 8,1 BAR / 0,2 BAR. Compatible with Case, Freightliner, Kenworth, Leyland, Mack, and Peterbilt vehicles. Equivalent to OE Case J905367, Cummins 3905367 and Freightliner TDAS9753030630.

Product identifiers
EAN Code8683457010949
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Compatible OEM Codes

  • WABCO
    • 975 303 063 0
  • PETERBILT
    • S 975-303-063-0
  • MERITOR
    • S9753030630
  • MACK
    • 6300-9753030630
  • LEYLAND
    • 1203027
  • KENWORTH
    • S975-303-063-0
  • FREIGHTLINER
    • TDAS9753030630
  • CUMMINS
    • 3905367
  • CASE
    • J905367

Description

What does an unloader valve do?

This unloader valve plays a critical role in the pneumatic brake system by managing air pressure within the lines. It ensures that the compressor operates efficiently by releasing air once the required threshold is reached, preventing over-pressurization. Built with high-strength components, it provides reliable performance under demanding heavy commercial vehicle conditions.

Vehicle and engine compatibility

The component is engineered for compatibility with various heavy commercial vehicles including Case, Freightliner, Kenworth, Leyland, Mack, and Peterbilt. It is also suitable for use in systems associated with Cummins, Meritor, and WABCO brands. This part ensures seamless integration within complex air brake and compressor assemblies.

Installation and maintenance

For proper maintenance, technicians should verify that the 3/4" - 14 NPTF ports are free from debris before installation. Monitoring the 8,1 BAR cut-out pressure is essential to ensure the air brake system maintains correct operating levels. Regular inspection of the recycle valve functionality helps prevent system leaks or pressure drops during operation.

System troubleshooting

Consult your authorized distributor for precise fitment verification.

OE cross-reference

301.01.0009 (Unloader Valve) is the equivalent of the Case, Cummins, Freightliner, Kenworth, Leyland, Mack, Meritor, Peterbilt and WABCO OE numbers. This part directly replaces Case OE number J905367. It also replaces Cummins OE number 3905367, Freightliner OE number TDAS9753030630, Kenworth OE number S9753030630, Leyland OE number 1203027, Mack OE number 63009753030630, Meritor OE number S9753030630, Peterbilt OE number S9753030630 and WABCO OE number 9753030630.

Technical Specifications

Technical Specifications
Port 13/4" - 14 NPTF
Port 4-
Port 213/4 "14 NPTF
Port 22-
Port 23-
PluggedOK
Cut-Out Pressure8,1 BAR / 0,2 BAR
Inflation Valve-
Recycle ValveOK

Other OEMs

CASE

  • J905367

CUMMINS

  • 3905367

FREIGHTLINER

  • TDAS9753030630

KENWORTH

  • S975-303-063-0

LEYLAND

  • 1203027

MACK

  • 6300-9753030630

MERITOR

  • S9753030630

PETERBILT

  • S 975-303-063-0

WABCO

  • 9753030630
  • 975 303 063 0

Related Products

Repair Kits

Compatible Vehicles

Compatible Vehicles
BrandModelModel TypeEngine
CASE
CUMMINS
FREIGHTLINER
KENWORTH
LEYLAND
MACK
MERITOR
PETERBILT
WABCO

FAQ

What is the function of this unloader valve?
This component manages air pressure by releasing air from the system once the specific cut-out pressure of 8,1 BAR is reached, ensuring stable pneumatic operation.
Which vehicle brands is this part compatible with?
It is designed for heavy commercial vehicles including Case, Freightliner, Kenworth, Leyland, Mack, and Peterbilt trucks.
What are the technical port specifications?
This unloader valve features Port 1 and Port 21 both configured as 3/4" - 14 NPTF to ensure standard industrial fitment.
How can I identify if the unloader valve needs replacement?
Technicians should look for symptoms such as inconsistent air pressure levels or failure to reach the 8,1 BAR cut-out threshold in the pneumatic system.
What are the OE reference numbers of this part?
301.01.0009 directly replaces Case OE number J905367. It also replaces Cummins OE number 3905367, Freightliner OE number TDAS9753030630, Kenworth OE number S9753030630, Leyland OE number 1203027, Mack OE number 63009753030630, Meritor OE number S9753030630, Peterbilt OE number S9753030630 and WABCO OE number 9753030630.