Exmark deck V-belt for Lazer Z 60-inch mowers — 135-5774-SL OEM replacement, restores factory drive performance

Genuine Exmark 135-5774-SL deck V-belt for Lazer Z 60-inch mower decks, designed to restore reliable deck drive performance.

This Exmark 135-5774-SL is an OEM deck V-belt made for many Lazer Z series 60-inch decks. It replaces worn or broken deck drive belts and matches factory specifications so pulleys, spindles, and idlers run as intended. Fitment depends on machine submodel, serial number and production date, so verify compatibility with your owner's manual before ordering.

Which Exmark models use this belt?

This belt is specified for a wide range of Lazer Z 60-inch decks across several Lazer Z families, including E-Series, S-Series, X-Series, AS and AC variants. Model lists can vary by year and configuration, so cross-reference your exact model and serial to confirm fit.

• Commonly fits Lazer Z E-, S- and X-Series 60-inch decks.
• Also listed for Lazer Z AS/AC and select propane/air-cooled models.
• Works with many factory part numbers cited in Exmark fitment tables.

How do I know this belt will replace my worn deck belt?

Check your mower’s parts diagram or owner’s manual for the Exmark part number 135-5774-SL or equivalent numbers like 116-1985 or 109-8073. Measure your old belt and compare routing to diagrams — identical tooth/angle profiles and length indicate a match.

• Compare part numbers stamped on the old belt or parts list.
• Confirm belt length, cross-section and V-profile match the original.
• Verify routing and pulley diameters match your deck assembly.

What are the installation and maintenance pointers?

Install the belt following Exmark’s deck routing diagram and recommended tensioning procedure to avoid premature wear. Inspect pulleys, idlers and spindle bearings while replacing the belt — damaged components will shorten belt life even if the replacement is correct.

• Remove debris and check pulleys for grooves or wobble before installing.
• Use correct tensioning and a secure routing path per the manual.
• Replace worn idlers or bearings to protect the new belt.

What performance should I expect after fitting this OEM belt?

Using an OEM Exmark belt restores factory drive geometry for consistent blade speed and deck engagement. Expect smoother power transfer to the spindles and reduced slipping under load when the belt and related components are in good condition.

• Improved engagement and reduced belt slip on loads.
• Longer service life when installed with healthy pulleys and idlers.
• Restores original equipment drive characteristics and alignment.

Who is this for: Service technicians and owners of Exmark Lazer Z 60-inch mowers who need an authentic factory replacement belt to maintain OEM performance. If your mower is slipping, squealing, or showing uneven blade speed and your parts list includes 135-5774-SL (or compatible numbers provided), this belt is the direct-fit replacement to return your deck to proper operation. Always consult your owner’s manual or an authorized Exmark dealer for final confirmation of fitment, especially when serial numbers or production dates differ from listed model groups.