Snapper Drive Disc 5-3103 and 5-7423 with Brake Liner Installed. OD 6" ID 5-1/8"

What It Is

This is a pre-assembled Snapper drive disc (OEM part numbers 5-3103 and 5-7423) with a brake liner installed. It couples the engine to the drive system on rear-engine riding mowers, engaging forward motion when the drive lever is pressed.

Fitment & Compatibility

• Measure first: The disc is 6" outer diameter with a 5-1/8" inner diameter. Confirm your old disc matches these exact dimensions—variations exist.
• Snapper models: Fits most Snapper rear-engine riders (RER) from the 1980s through early 2000s, including 33" and 38" cut deck models (e.g., 331416, 381417). Check your model number on the frame tag under the seat.
• OEM vs aftermarket: This is a genuine Snapper part, not a generic. It replaces both 5-3103 and 5-7423. Aftermarket versions may lack the pre-installed brake liner or use thinner material.
• What to verify: Ensure your mower uses a rubber drive disc (not a metal clutch) and that the brake liner is worn—if the liner is intact, you may only need the disc itself.

Key Things to Know

• Pre-assembled saves time: The brake liner is riveted in place, so you don’t need to align and install it separately. Just bolt the disc onto the engine shaft.
• Installation difficulty: Moderate. You’ll need to remove the mower deck and belt for access. A socket set and a puller for the old disc are helpful—tapping it off can damage the shaft.
• Common gotcha: Don’t overtighten the center bolt. Torque to about 20-25 ft-lbs; too much force can distort the disc or strip the crankshaft threads.
• Wear indicator: If the mower hesitates or slips when engaging drive, the disc surface is likely glazed or the liner is thin. Replace both at once to avoid repeat labor.

Should You Buy It

If your Snapper RER slips or won’t engage drive, and your disc measures 6" OD with a worn liner, this is the correct, hassle-free replacement. It’s a solid value for a genuine OEM part that includes the liner—skip cheap knockoffs that may wear faster or fit poorly.