Description
Overview:
This throttle lockout is a genuine Husqvarna safety component for cordless trimmers and related machines. Made from durable moulded plastic in high-visibility Husqvarna orange, it sits above the trigger to prevent accidental throttle engagement until intentionally pressed. Designed for precise fit and reliable function, it helps maintain safe operation and consistent trigger feel on tools such as the 315iC and 520iLX. Supplied as a Genuine Part, it matches the original specification and interfaces correctly with the trigger and handle housing. Identified by MPN 577512301 (also referenced as 577 51 23-01), it is suitable for replacing worn, cracked, or missing lockout levers during routine maintenance or repair, restoring the intended interlock action and reducing the risk of unintended start-up in everyday use.
Key Features:
- Genuine Husqvarna part for correct fit and function on compatible models
- Prevents unintended throttle activation by providing a positive interlock
- Robust moulded plastic construction for long service life
- High-visibility orange finish for quick identification during checks
- Quick to install with basic hand tools; no modifications required
- Restores proper trigger feel and safety compliance after wear or damage
- Designed to align with OEM handle geometry and pivot points
- Reliable performance in professional, rental, and domestic environments
- Clear part numbering (577512301 / 577 51 23-01) for easy reordering
- Cost-effective replacement to maintain tool uptime and safety
Typical Applications:
Ideal for routine maintenance and repairs on Husqvarna battery trimmers and pole tools. Use it to replace a damaged or missing lockout, to resolve sticky or unsafe triggers, or after impact, wear, or plastic fatigue. Suitable for landscapers, grounds teams, hire fleets, and homeowners maintaining safe, controlled throttle operation.
Also known as:
Throttle interlock, safety trigger, trigger interlock lever, throttle safety lock, operator presence lockout, trigger release lock, throttle blocking lever, safety latch for trigger.
Fits Models:
136 LiC, 136LIC, 315iC, 336 LiC, 336LiC, 520iHE3, 520iHT4, 520iLX, 530iP4, 530iPT5, 530iPX, 536 LiL, 536 LiLX, 536LIL, 536LILX, 536LiHE3, 536LiP4, 536LiPT5, 536LiPX
Alternate Part Numbers:
577 51 23-01, 577512301
Product Specifications
| L&S Part No. | 577 51 23 01 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Husqvarna |
| OEM No. | 577512301 |
| Unit of Sale | 1 |
| Applications | 136 LiC, 136LIC, 315iC, 336 LiC, 336LiC, 520iHE3, 520iHT4, 520iLX, 530iP4, 530iPT5, 530iPX, 536 LiL, 536 LiLX, 536LIL, 536LILX, 536LiHE3, 536LiP4, 536LiPT5, 536LiPX |
| Fits Brands | Husqvarna |
| Fits Models | 536LiHE3 | 536LiP4 | 536LiPT5 | 536LiPX | 136 LiC | 336 LiC | 536 LiL | 536 LiLX | 530iPT5 | 520iLX | 520iHE3 | 520iHT4 | 315iC | 336LiC | 530iP4 | 530iPX |
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