4426048 Engine Air Heater Controller Unit Hitachi Excavator Electric Parts ZX Hydraulic Excavator Electric Parts

Technical specifications

Fits this Hitachi machine

It is used on the Hitachi ZX excavator. Send us the machine serial and the number plate or photos of the old unit and we will confirm the part before dispatch. Browse our Hitachi parts and excavator electric parts range.

Why fit this engine air heater controller unit

• Correct coil resistance - so the controller drives it without fault codes.
• Sealed connector - keeps water and dust out of the pins on a wet machine.
• Plug and play - original connector and mounting, no rewiring.
• Bench checked - coil and valve function tested before packing.

Signs this engine air heater controller unit needs replacing

• Fault code - or a function that stops responding.
• No click from the solenoid - when the function is commanded.
• Intermittent operation - that changes with temperature or vibration.
• Burnt smell or a melted connector - at the coil.

If your ZX shows any of these signs, replacing the part is the fastest way back to full production.

Installation notes

• Key off and discharge the harness before unplugging any connector.
• Check the supply voltage and earth at the plug before condemning the part.
• Keep the connector seals in place when refitting.
• Clear the fault codes and test every function after the swap.

Q: Which machines does this engine air heater controller unit fit?

A: Hitachi ZX. Send your machine serial number and a photo of the old part so we can cross-check before ordering.

Q: What does this part do?

A: It switches hydraulic flow electrically or reports machine condition back to the controller.

Q: How do I know it needs replacing?

A: Watch for fault code, no click from the solenoid and intermittent operation. Any of these on a working machine usually means the part is at the end of its life.

Q: Is this an original Hitachi part?

A: This is an OTTO aftermarket part built to replace Hitachi 4426048. It is not a Hitachi branded part. We also quote genuine parts on request.

Q: What are the lead time, shipping and payment terms?

A: In-stock units ship within 1-3 working days. We ship worldwide by DHL, TNT, UPS, air or sea freight with export packing. Trade terms: EXW, FOB, CIF or DDP; payment by T/T, Western Union, L/C or Paypal.

Q: Why choose OTTO?

A: Listed manufacturer and exporter with 20+ years in excavator parts.
OEM quality at competitive prices; components tested before shipment.
Stable supply and export packing for wholesale and dealer programs.
Worldwide shipping with full documents and after-sales support.