Exmark 109-6388 Anti-Scalp Roller Kit Quest SP Pioneer E S Series 2 Pack

What It Is

The Exmark 109-6388 Anti-Scalp Roller Kit is a 2-pack of OEM replacement rollers designed to prevent the mower deck from scalping grass on uneven terrain. It’s intended for use on select Exmark Quest, SP, Pioneer, and E-Series mowers.

Fitment & Compatibility

• Exact fit: Exmark 109-6388 replaces the original rollers on 48", 52", and 60" decks used on Quest, SP (Super Pro), Pioneer, and E-Series models (check your serial number range).
• Measure first: Confirm roller diameter (~4.5") and bolt pattern (two 5/16" bolts, 3" on center). If your existing roller measures differently, this kit won’t fit.
• OEM vs aftermarket: This is genuine Exmark—pricier than generic, but guarantees exact geometry for proper deck leveling. Aftermarket copies may have slightly different bushing fit or roller hardness.
• Check your deck: Not compatible with older Exmark Lazer Z or Turf Tracer decks. Verify your deck’s part number against Exmark’s compatibility list (available on their site).

Key Things to Know

• Quality: Steel bracket with a durable nylon roller. Holds up well against wear from gravel or rough ground, but the roller itself can crack if you hit curbs or rocks repeatedly.
• Installation difficulty: Easy—remove two bolts per roller, swap, reinstall. No special tools needed. Torque bolts to 20-25 ft-lbs.
• Common gotcha: The roller brackets are handed (left vs right). The kit includes one of each, so double-check orientation before tightening. Also, if your deck has worn mounting holes, you may need to add washers or helicoils to prevent slop.
• When to replace: If the roller is flat-spotted, cracked, or the bushing is sloppy enough to let the roller wobble, replace both sides at once to maintain even deck height.

Should You Buy It

Buy this kit if you own a compatible Exmark Quest, SP, Pioneer, or E-Series mower and your current anti-scalp rollers are worn or damaged. It’s a direct OEM fit with no guesswork, ideal for DIY maintenance on a late-model deck. If you’re on a tight budget or have an older machine, a generic replacement may work, but you risk fitment or durability issues. For most Exmark owners, this is the safe, reliable choice.