Air Conditioning Conversion Kit for John Deere 4230, 4240, 4430, 4440 - Sanden Style, 990-403K

Ditch the aging A6 compressor and upgrade your John Deere tractor to a modern Sanden-style A/C system with this complete, all-in-one conversion kit from AP Air. Everything you need for a clean, reliable installation is included — no sourcing individual parts.

What's Included (SKU: QFS-990-403K)

• Sanden-Style Compressor Conversion Kit (990-403) — replaces the original A6 piston compressor with a lightweight, efficient rotary unit
• Receiver Drier — new desiccant to keep moisture out of the system
• Expansion Valve — controls refrigerant flow for optimal cooling performance
• O-Ring Kit — all seals needed for a leak-free installation

Designed to use your original belt and hoses — no custom fabrication or hose rerouting required.

Compatible John Deere Models

• John Deere 4040 & 4040 Euro
• John Deere 4230
• John Deere 4240, 4240 Euro & 4240S
• John Deere 4350
• John Deere 4430
• John Deere 4440
• John Deere 7720
• And more — contact us to confirm fitment on your specific model

Why Upgrade from the A6 Compressor?

The original A6 piston compressor is heavy, inefficient, and increasingly difficult to find parts for. The Sanden rotary compressor offers:

• Less engine load — lighter weight means less parasitic drag
• Better cooling efficiency — especially at low RPMs during field work
• R134a compatibility — works with the modern, readily available refrigerant standard
• Widely serviceable — any shop with modern A/C equipment can service a Sanden system

Installation Notes

• Flush the system before installing to remove residual mineral oil from the old A6 system
• Use PAG oil specified for the Sanden compressor — do not mix with old mineral oil
• Replace all O-rings with HNBR (green) O-rings rated for R134a (included in kit)
• Have the system professionally evacuated and recharged with R134a refrigerant