MTD Lawn & Garden Equipment Hi-Pro Key 914-0388

Basic information

• Part name: Lawn and garden equipment Hi-Pro key
• Manufacturer: MTD
• Category: Lawn and garden equipment hardware
• Primary function: Provides a keyed connection to transfer torque between mating components on a shaft

Technical specifications

• Size: 3/16 x 5/8 inch
• Type: #61 Hi-Pro key

Installation & compatibility

• Compatible models: Fits select MTD, Craftsman, Sears, Troy-Bilt, and Yard-Man lawn and garden equipment; confirm compatibility using your models parts diagrams
• Installation difficulty: Easy; requires inserting the key into the matching shaft keyway
• Tools required: Pliers, small punch

Additional information

This lawn and garden equipment Hi-Pro key, part number 914-0388, fits into a keyway on a shaft and the corresponding slot in a hub, gear, or pulley to help transfer torque and maintain a positive mechanical connection. The Hi-Pro design and square profile help prevent slippage between the shaft and mating component so they turn together consistently.

If the Hi-Pro key wears, rounds off, or breaks, components connected by the key may slip on the shaft, which can lead to reduced performance, sudden loss of drive, or uneven motion. You might notice noise, vibration, or intermittent engagement if the key is damaged or missing.

Disconnect the spark plug wire or battery, depending on your equipment, before starting the repair to prevent accidental startup. Shaft and keyway areas can have sharp edges, so wearing work gloves can help protect your hands during installation. Make sure the key seats fully in both the shaft and mating component before using the equipment.

Lawn and garden equipment Hi-Pro key 914-0388 replaces part numbers A-1375, 714-0388, 3/16X5/8, 400061, 73-3-0-10-0, FF-1375, 706-15940, 21539, 70811, 72-3-0-10-0, 71-3-0-10-0, 714-388.