Left-Hand (LH Driver Side) Cabin Door Lock Latch Mechanism for Case IH & Deutz-Fahr Tractors - Part Number: 65404008
The heavy-duty left-hand (LH driver-side) cab door lock latch mechanism (part number 65404008, cross-referenced genuine Case IH OEM references I87639168, K303805, 87639168 and Deutz-Fahr OEM references 04339352/10, 04339352) is an authentic OEM-grade door closure and capture assembly engineered to provide positive, secure, and vibration-free cab door locking on Case IH (including Maxxum, CX, and MX cab enclosures) and Deutz-Fahr agricultural tractors (07C series, classic DX, DX 4, DX 6, and DX 7 cabs). Fabricated with a heavy-gauge stamped steel housing protected by an anti-corrosion galvanized coating, it incorporates a progressive two-stage safety rotary catch system with linkage sockets for internal release handles, external door handles, and locking rods. Built strictly to original equipment tolerances, it delivers uniform perimeter clamping pressure against the left door weatherseal, preventing cab rattles, wind noise, draft ingress, exhaust fumes, and fine field dust contamination. It offers direct plug-and-play fitment across widespread Case IH tractor models (94 series, A-Familie, CX, D-Linie, Maxxum 5100/5200, MX / MX Maxxum) and Deutz-Fahr tractor lines (07C series, DX, DX 4, DX 6, and DX 7).
Key Features & Engineering Advantages
- Two-Stage Positive Rotary Safety Catch: Progressive two-position latching cycle (initial capture and full lock) prevents accidental door unlatching under harsh field vibrations, engine harmonics, and rough terrain haulage.
- Direct Multi-Brand Fitment (Case IH / Deutz-Fahr): Mounting hole centers, backset, and linkage pivot points strictly conform to original cab door profiles, ensuring seamless bolt-on fitment without drilling, slotting, or rod re-engineering.
- Anti-Corrosion Tropicalized Zinc Plating: Rugged metallic casing and internal pivot pins resist oxidation, moisture, acidic agrochemicals, mud, and high-pressure steam cleaning.
- High-Tensile Internal Return Spring Pack: Calibrated spring pack delivers crisp, low-effort handle return, eliminating handle rattle, sag, and sticky mechanical actuation from both inside and outside the cab.
- Acoustic & Climate Cab Insulation: Exerts uniform clamping force on the perimeter door rubber seal, ensuring full cab soundproofing and maintaining climate control pressurization.
Technical Specifications
| Commercial Part Number |
65404008 |
| Mounting Location / Side |
Left-Hand (LH - Driver Side Door) |
| Case IH OEM References |
I87639168, K303805, 87639168 |
| Deutz-Fahr OEM References |
04339352/10, 04339352 (cross-ref: I87639168) |
| Component Classification |
Mechanical internal cabin door lock latch mechanism |
| Structural Material |
High-tensile zinc-plated stamped steel with wear-resistant hardened pivot pins |
| Actuation Mechanism |
Dual-stage rotary latch with linkage rod attachment sockets |
Equipment Compatibility & Tractor Application Guide
| Manufacturer |
Tractor Series |
Supported Tractor Models |
| Case IH |
94 Series & D-Linie Series |
1194, 1294, 1394, 1494, 1594, 1694 • D 440 |
| A-Familie Series |
440, 540, 640, 740, 840, 940 (1/90-12/92) |
| CX Series |
CX 50, CX 60, CX 70, CX 80, CX 90, CX 100 |
| Maxxum 5100 Series |
Maxxum 5120, Maxxum 5130, Maxxum 5140, Maxxum 5150 |
| Maxxum 5200 Series |
Maxxum 5220, Maxxum 5230, Maxxum 5240, Maxxum 5250 |
| MX & MX Maxxum Series |
MX 80C, MX 90C • MX 100 Maxxum, MX 110 Maxxum, MX 120 Maxxum, MX 135 Maxxum, MX 150 Maxxum, MX 170 Maxxum |
| Deutz-Fahr |
07C Series |
D 4507C, D 4807C, D 5207C, D 6007C, D 6207C, D 6507C, D 6807C, D 6907C, D 7007C, D 7207C, D 7807C |
| DX Series |
DX 80, DX 85, DX 86, DX 90, DX 92, DX 110, DX 120, DX 145, DX 160 |
| DX 4 Series |
DX 4.10, DX 4.30, DX 4.50, DX 4.70 |
| DX 6 Series |
DX 6.05, DX 6.10, DX 6.30, DX 6.50 |
| DX 7 Series |
DX 7.10 |
Installation Advice & Workshop Notes: Before installation, dismantle the interior door trim panel on the LH door to reveal the latch pocket, and carefully unclip the linkage rods linking the exterior handle and the inside release mechanism. Unbolt the mounting fasteners from the door profile and remove the old latch unit. Position the new 65404008 latch mechanism, reconnect all operating linkage rods, and verify that they actuate freely without bending or binding. Tighten mounting screws securely, then align the striker pin on the cab B-pillar: the door should catch cleanly on the initial safety catch and close into the full lock position with moderate pressure, fully compressing the perimeter rubber seal. Periodically lubricate internal moving pawls and pivot points with white lithium grease or water-resistant PTFE spray.
