OE Quality
60-Day Returns

Baldwin BT420 Transmission Oil Filter
Reliable Transmission Oil Filter for Hyster Lift Trucks
The Baldwin BT420 transmission oil filter is engineered to maintain optimal transmission performance in Hyster lift trucks. Designed with essential features like an anti-drainback valve and an 8 psid by-pass valve, this filter ensures consistent fluid flow and protection under various operating conditions.
- Includes anti-drainback valve to prevent fluid loss during shutdown
- Equipped with an 8 psid by-pass valve for pressure regulation
- Compatible with Hyster lift trucks, replacing Hyster part number 309112
- Height of 4 15/32 inches (113.5 mm) for precise fitment
- Outside diameter of 3 11/16 inches (93.7 mm) with 4-mar thread
- Integral gasket (G401) ensures secure sealing
- 16 per inch thread pitch for proper installation
The Baldwin BT420 transmission oil filter is specifically designed to meet the filtration requirements of Hyster lift trucks. Its integral gasket (G401) provides a reliable seal to prevent leaks, while the anti-drainback valve helps maintain fluid in the transmission during engine shutdown, reducing wear on components. The 8 psid by-pass valve allows fluid to bypass the filter element if it becomes clogged, ensuring continuous transmission operation. With precise dimensions including a height of 4 15/32 inches and an outside diameter of 3 11/16 inches, this filter replaces the Hyster 309112 part number, making it a direct fit for compatible models.
Applications and Problem Solving
- Prevents transmission fluid starvation during engine off cycles
- Maintains proper fluid pressure with built-in by-pass valve
- Protects transmission components from contaminants and debris
- Reduces risk of transmission overheating due to clogged filters
- Ensures consistent transmission performance in Hyster lift trucks
Installation Notes and Tips
When installing the Baldwin BT420 transmission oil filter, ensure the integral gasket (G401) is properly seated to avoid leaks. Verify the 4-mar thread engagement and torque specifications according to the Hyster lift truck service manual. It is recommended to replace the filter during scheduled transmission maintenance intervals to maintain optimal performance.
Quality Assurance and Warranty
Baldwin transmission oil filters are manufactured to meet industry standards for filtration efficiency and durability. The BT420 model undergoes rigorous quality control to ensure reliable operation in demanding environments. Please refer to Baldwin's official documentation for warranty details applicable to this transmission oil filter.
| Brand | Baldwin |
| Part Number | BT420 |
| Contains | Anti-drainback valve;8 psid by-pass valve |
| Fits | Hyster lift trucks |
| Height | 4 15/32 |
| Height (mm) | 113.5 |
| Integral Gasket | {g401} |
| Outside Diameter 1 | 3 11/16 |
| Outside Diameter 1 (mm) | 93.7 |
| Per Inch | 16 |
| Replaces | Hyster 309112 |
| Thread | 4-mar |
This part fits 0 vehicles. Search below:
| Year | Make | Model | Position | Notes |
|---|
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.