103-0664 / 1-631645 PTO Clutch Replacement for Exmark Lazer Z | Warner 5218-5
$178.95
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103-0664 / 1-631645 PTO Clutch Replacement for Exmark Lazer Z | Warner 5218-5
$178.95
Overview
This 103-0664 / 1-631645 PTO clutch replacement is an aftermarket electric clutch for select Exmark Lazer Z commercial zero-turn mowers. It also replaces 1-633099 on supported applications using the corresponding Warner 5218-5 clutch configuration.
The assembly features a 1-1/8-inch crankshaft bore, single-groove pulley measuring approximately 6-1/8 inches outside diameter, clockwise rotation viewed from the pulley side, and a reverse-mount configuration.
Key Features
- Aftermarket electric PTO clutch replacement for select Exmark Lazer Z applications
- Primary OEM Reference: 103-0664
- Additional OEM References: 1-631645, 1-633099
- Manufacturer Cross-Reference: Warner 5218-5
- Crankshaft Bore: 1-1/8 inches / 1.125 inches
- Measured Pulley Outside Diameter: approximately 6-1/8 inches / 6.125 inches
- Pulley Type: single-groove V-belt pulley
- Belt Width: 5/8-inch belt on supported applications; use the OEM-specified belt for your mower
- Rotation: clockwise (CW), viewed from the pulley side
- Mounting Style: reverse mount
- Voltage: 12V DC
- Connector: flat side-by-side at clutch or optional wire harness to extend to T-plug
- Integrated electromagnetic clutch and brake assembly
Compatible Exmark Applications
This replacement is intended for select early Exmark Lazer Z commercial mower applications specifying 103-0664, 1-631645, 1-633099, or the corresponding Warner 5218-5 clutch.
The Lazer Z family includes different engine packages, crankshaft sizes, and clutch configurations. Confirm the original clutch number or consult the Exmark parts diagram for your complete mower model and serial number.
OEM Part Number References
- Toro / Exmark: 103-0664, 1-631645, 1-633099
- Additional catalog references: 631645, 633099, E633099
Manufacturer Cross-Reference
- Warner Electric: 5218-5
- Warner Electric: 52185
Before You Order
Compare your original clutch with the product photos and confirm:
- The original clutch number matches the application listed above
- The crankshaft requires a 1-1/8-inch bore
- The bore and key arrangement match your original assembly
- The mower uses a single-groove, reverse-mount clutch
- Rotation is CW when viewed from the pulley side
- The belt groove, pulley offset, and mounting height suit your mower
- The wiring connector and anti-rotation connection match the installation
Need help comparing your clutch? Send us the mower model, serial number, original clutch number, and clear photos before ordering.
What’s Included
- Complete aftermarket electric PTO clutch assembly
- Integrated single-groove pulley
- Pre-installed bearing assembly
- Electromagnetic coil and brake assembly
- Flat side-by-side clutch connector
- Optional wire harness extension
Why Buy From PTO Direct USA?
- Fast USA shipping
- Fitment Guarantee
- Fitment support before and after purchase
- Clear product photos for easier clutch identification
- Support for homeowners, commercial operators, and mower repair professionals
FAQ
Does this PTO clutch replace Exmark 103-0664 and 1-631645?
Yes. This aftermarket clutch is offered as a replacement for 103-0664, 1-631645, and 1-633099 on supported applications. Match your original clutch number and physical configuration before ordering.
Does this fit every Exmark Lazer Z?
No. Exmark used different PTO clutches across the Lazer Z range. Your mower’s model, serial number, engine configuration, and original clutch number determine the correct replacement.
Why do some reference specifications list a 6.3-inch pulley?
Warner lists a 6.31-inch outside diameter for its 5218-5 clutch. The aftermarket unit offered here has a measured outside diameter of approximately 6.125 inches.
Outside diameter and the working diameter where the belt rides are different measurements. For belt speed, the critical measurement is that working diameter—not the outer flange edge. This aftermarket clutch is designed to replace the OEM and manufacturer part numbers listed here.
What bore size does this clutch use?
This clutch has a 1-1/8-inch crankshaft bore, also written as 1.125 inches. Match the bore and key arrangement to your original clutch.
Is this a reverse-mount clutch?
Yes. This replacement uses a reverse-mount configuration. Follow the mounting orientation and spacer arrangement specified for your mower. Product-photo orientation is not an installation diagram.
What connector does this clutch use?
The clutch has a flat side-by-side connector. An optional wire harness extends the connection to a T-plug. Compare your mower’s connector before selecting the configuration.
What belt should I use?
Use the OEM-specified belt for your exact mower and deck configuration. Supported applications commonly use a 5/8-inch V-belt. Belt width, length, and profile must suit the complete drive system.
Can PTO Direct USA help confirm fitment?
Yes. We provide fitment support before and after purchase. Email support@ptodirectusa.com with your mower model, serial number, engine information, and original clutch number. Photos of the clutch label, bore, pulley, connector, and anti-rotation connection help us compare the installation.