323-9531 24V Solenoid Valve Coil for CAT Automatic Transmission – Modulating Valve Coil, Compatible with 725/730/735/740B, 5110B

Short Description:

323-9531 / 3239531: 24V DC modulating valve coil for CAT automatic transmissions, regulates fluid pressure for optimized shifting.
Official CAT Definition: Controls modulating valve operation in automatic transmissions.
Aftermarket Dimensions (Verify): 13mm ID × 44mm H, 34mm OD, 9Ω, 62W per one seller — confirm against original.
Wide Compatibility (Reference): Listed for CAT 725/730/735/740B trucks, 5110B excavator, D-series tractors, C-series engines. Confirm by serial number.

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Product Detail

Product Tags

323-9531 24V Solenoid Valve Coil — CAT Modulating Valve Coil

This 24V DC solenoid coil is a replacement for the Caterpillar 323-9531 (also formatted as 3239531 / CA3239531). According to CAT’s official description, this coil controls the operation of the modulating valve within automatic transmissions, regulating fluid pressure and optimizing gear shifts.

Confirmed Specifications

Part number: 323-9531 (interchangeable formatting: 3239531, CA3239531)
Voltage: 24V DC
Function: Modulating valve coil for automatic transmissions

Aftermarket Specifications (Vary by Supplier — Verify Before Purchase)

One aftermarket listing provides dimensional and electrical data that may assist with physical fitment checks:

Inner diameter: 13 mm
Height: 44 mm
Outer diameter: 34 mm
Resistance: 9 Ω
Power: 62 W
Current: 2.6 A

Important: These figures come from a single aftermarket seller and are not confirmed by CAT official documentation. Verify against your original coil before ordering.

Compatible Equipment (Reference List)

Multiple aftermarket sources list compatibility with a broad range of CAT machinery, including:

Articulated Trucks: 725, 725C, 730, 730C, 735, 735B, 740B
Mining Excavator: 5110B
Motor Graders: 120H, 120K, 12H, 140H, 160H, 24H and others
Track-Type Tractors: D6R, D7R, D8R, D10R, D11R and others
Engines: C4.4, C7.1, C9, C9.3

This list is not exhaustive and is compiled from aftermarket listings. Always confirm fitment using your machine’s serial number and CAT’s official parts catalog.

Ordering Notes

Confirm whether the unit is genuine CAT or an aftermarket replacement — listings exist for both, with significant price differences.
Verify coil resistance and dimensions against your original part.
Request the exact part number on the quotation to avoid substitution.