Product Description
The 91246-35300 is a direct replacement master cylinder for Mitsubishi and Caterpillar electric forklifts. This heavy-duty component delivers reliable brake system performance in 30,000-35,000 lb capacity lift trucks. The cast iron construction provides thermal stability and durability for rigorous industrial service. Compatible with DOT 3 and DOT 4 brake fluids, the 91246-35300 maintains consistent hydraulic pressure across thousands of lift cycles. This factory-spec replacement upgrades braking efficiency and safety for your fleet.
Specifications
Dimensional
| Bore Diameter | 7/8 inch |
| Mounting Hole Pattern | 2-bolt flange, 2.25 inch center-to-center |
| Reservoir Capacity | 2.5 fluid ounces |
Hydraulic
| Fluid Compatibility | DOT 3 or DOT 4 hydraulic brake fluid |
| Working Pressure | Nominal operating pressure 1200 PSI |
| Service Factor | 1.0 continuous duty |
Material
| Body Material | Cast iron, SAE J431 grade |
| Reservoir Material | High-density polyethylene (HDPE) |
| Sealing Material | EPDM rubber, SAE J200 compliant |
Part Numbers
| Part Number | 91246-35300 |
| Cross-Reference Part Numbers | Supersedes 505963537; equivalent factory-spec replacement for Mitsubishi 91246-35300 and Caterpillar 91246-35300 |
| Compatible Models | FD20-25 (F18A), FG20-25 (F17A), FD30-35 (F14B), FG30-35 (F13C), Caterpillar M20, M25, MC30 |
Frequently Asked Questions
Q: What are the compatible models for the 91246-35300 master cylinder?
A: The 91246-35300 fits Mitsubishi models FD20-25 (F18A), FG20-25 (F17A), FD30-35 (F14B), FG30-35 (F13C), and Caterpillar M20, M25, MC30 electric lift trucks. Always verify your specific model and serial number range before ordering to confirm cross-compatibility.
Q: What is the bore diameter and construction material of the 91246-35300?
A: The 91246-35300 features a 7/8 inch bore diameter and is constructed from cast iron per SAE J431 standards. This heavy-duty construction provides thermal stability and durability for extended service in industrial electric forklifts.
Q: What cross-reference part numbers are associated with the 91246-35300?
A: The 91246-35300 is a direct replacement that supersedes part number 505963537. Both part numbers refer to the same assembly. If you encounter the older number in service manuals or equipment documentation, they are functionally equivalent.
Q: What brake fluid types are compatible with the 91246-35300?
A: The 91246-35300 is compatible with DOT 3 and DOT 4 brake fluids. Always use only the fluid type specified in your equipment service manual. Fluid compatibility is critical to seal integrity and brake system reliability.
Q: What equipment weight capacity does the 91246-35300 support?
A: The 91246-35300 is used in 30,000 to 35,000 pound capacity electric lift trucks. The 7/8 inch bore is sized to provide adequate hydraulic pressure and brake force for equipment in this weight range.
Q: How do I verify that the 91246-35300 is the correct replacement for my lift truck?
A: Check your equipment serial number plate against the compatible model list (FD20-25, FG20-25, FD30-35, FG30-35 for Mitsubishi; M20, M25, MC30 for Caterpillar). Verify the bore diameter matches your existing cylinder. When in doubt, measure the bore diameter on the current unit before ordering.
Q: What is the working pressure rating of the 91246-35300?
A: The 91246-35300 operates at a nominal working pressure of 1200 PSI with a service factor of 1.0 continuous duty. This rating ensures reliable performance across the full operational range of compatible lift trucks.