511010601 Trimmer Head - Fits Redmax PT104, PT-104 Plus, BC250, BC2300 - 2 Pack Ver. 1

511010601 / PT104 Trimmer Head for Redmax String Trimmers

Key Features

• Heavy-Duty Bump-Feed Mechanism: Designed for commercial-grade durability, the PT104 "Plus" style head allows for rapid line advancement with a simple tap on the ground during full-throttle operation.
• High-Capacity Spool: Accommodates up to 20 feet of 0.095" diameter line, significantly reducing downtime spent reloading during large landscaping jobs.
• Reinforced Eyelets: Features high-grade metal alloy line exits that resist heat buildup and friction, preventing the trimmer line from "welding" to the head during heavy use.
• Split-Spool Design: Engineered with an internal divider to prevent line tangling and "overlapping," ensuring a smooth, consistent feed every time the head is bumped.
• Impact-Resistant Polymer: Manufactured from a specialized glass-filled nylon composite to withstand high-velocity impacts with rocks, curbs, and fence posts.

Replaces / Cross-Reference Part Numbers

• 511010601
• PT104
• 515638601
• 521472101
• 521540601
• 970370901
• 385-220
• BC00088

Compatibility & Fitment

This trimmer head is the standard "professional choice" for Redmax and Husqvarna-based straight shaft trimmers. Key compatible models include:

• Redmax BC Series: BC250, BC225, BC2300, BC2600.
• Redmax BCZ Series: BCZ2400S, BCZ2401S, BCZ2460S, BCZ2460TS, BCZ2600S, BCZ2601S, BCZ2660TS, BCZ3060TS.
• Redmax TR Series: TR2300S, TR2301S, TR2350S.
• Husqvarna: Fits many 200 and 300 series straight shaft trimmers (e.g., 223L, 323L, 326L) utilizing the M10 x 1.25 LHF (Left Hand Female) arbor thread.

When to Replace

• Worn-Through Bump Knob: The red center knob has ground down to the point where the internal spring is exposed or it no longer triggers the line release.
• Cracked Housing: Visible stress fractures in the black outer shell, which can lead to the head shattering at high RPMs.
• Eyelet Failure: The metal eyelets have fallen out or are deeply grooved, causing the line to snap off inside the head frequently.
• Internal Spool Jamming: The plastic "teeth" inside the head that lock the spool have rounded off, causing the head to dump all the line at once.
• Excessive Vibration: The head has become unbalanced due to uneven wear, putting unnecessary stress on the trimmer's gear head and shaft.

Installation Tips

• Left-Hand Threads: Remember, this head is Left-Hand Threaded. To tighten it onto the trimmer, you must turn it Counter-Clockwise.
• Lock the Gear Head: Use a small screwdriver or the factory locking pin to hold the gear head shaft stationary while you spin the old head off and the new one on.
• Spool Direction: When reloading line, follow the arrows molded into the spool. Loading the line in the wrong direction will prevent the bump-feed mechanism from working.
• Soak Your Line: Professional tip: soak your trimmer line in a bucket of water for 24 hours before loading. This keeps the nylon flexible and prevents it from becoming brittle and snapping at the eyelet.
• Clean the Spring: Every time you reload the line, shake out any dirt or grass trapped around the internal spring to ensure the "bump" action stays smooth.