[Lifetime Warranty] 537185801 T35 Trimmer Head Bump Knob - Pack of 4

537185801 T35 Trimmer Head Bump Knob - Pack of 4

Key Features

• Package contains four (4) replacement bump knobs.
• Enables tap-to-advance line feeding for the trimmer head.
• Constructed from high-impact plastic for durability.
• Diameter: 2.5 inches

Replaces / Cross-Reference Part Numbers

• 537185801

Compatibility & Fitment

• Fits trimmer head model: T35
• Compatible with select string trimmers from Husqvarna, Poulan, RedMax, Jonsered, AYP, and Craftsman.
• Example of a compatible model: Husqvarna 224L
• Note: Verify fitment by confirming your trimmer uses a T35 head and requires part number 537185801.

When to Replace

• The existing knob is cracked, broken, or severely worn from ground contact.
• The line-feeding mechanism fails to activate when tapped.
• The knob no longer threads securely onto the spool.

Installation Tips

• Disconnect the spark plug before performing any maintenance.
• Unscrew the old knob from the trimmer head. Note that some models may have reverse threading.
• Remove the spring from the old knob and place it into the new one.
• Thread the new knob onto the spool assembly until it is hand-tight.