24VDC Heavy-Duty Variable Speed Slide Gate Operator
Built for heavy gates and extreme use, the HDSL24UL is rated for slide gates up to 75 ft and 3,000 lb, with a variable cycle speed of 0.5 to 1 ft per second. Eagle Automatic Gate & Door, an authorized LiftMaster dealer, supplies, installs and services the HDSL24UL across the Bay Area.
Official specs and manuals: LiftMaster HDSL24UL page
From LiftMaster’s HDSL24UL product page, installation manual and spec sheet. Confirm against the manual for your unit.
The questions homeowners ask us most about the HDSL24UL, answered in one line each.
From the published HDSL24UL spec sheet and installation manual. Have a different question? Ask a specialist
“We put the HDSL24UL on the big ones: long, heavy estate and commercial slide gates up to 3,000 lb. Set up right, it runs them smoothly for years.”
No, and it’s the most common mistake I see. If a heavy gate drags, the problem is the track, rollers or guide, and a stronger motor just pushes harder against it until something wears out. Before we install an HDSL24UL, we roll the gate by hand. It should move with steady pressure on a clean, level track. If it doesn’t, we fix the rollers or track first. That’s what makes the operator last.
— Jeff, Gate Installation Manager
Every HDSL24UL ships with the monitored safety devices LiftMaster includes for UL 325.
Monitored retro-reflective photo eye
5 ft small-profile resistive edge with aluminum channel
Pick the operator by gate weight, length and how hard it works. Every figure is from LiftMaster’s product pages.
| CSL24UL | This modelHDSL24UL | INSL24UL | IHSL24UL | |
|---|---|---|---|---|
| Type | 24VDC high-traffic commercial | 24VDC heavy-duty, variable speed | 24VDC continuous-duty industrial | 24VDC continuous-duty industrial |
| Max gate weight | 1,500 lb | 3,000 lb | 2,200 lb | 5,500 lb |
| Max gate length | 50 ft | 75 ft | 70 ft | 90 ft |
| Battery backup | Yes | Not listed | Yes | Yes |
| Solar-ready | Yes | Not listed | Not listed | Not listed |
| Operator warranty | 7 yrs residential, 5 yrs commercial | See LiftMaster | See LiftMaster | See LiftMaster |
| View CSL24UL | You’re here | View INSL24UL | View IHSL24UL |
Sources: CSL24UL · HDSL24UL · INSL24UL · IHSL24UL. “Not listed” means LiftMaster’s page doesn’t state it.
All-O-Matic’s SL-150 DC PRO is its heavy-gate DC slide operator, in ½ HP and 1 HP versions.
| LiftMaster HDSL24UL | All-O-Matic SL-150 DC PRO ½ HP | All-O-Matic SL-150 DC PRO 1 HP | |
|---|---|---|---|
| Motor | 24VDC, variable speed | 24VDC brushless, ½ HP | 24VDC brushless, 1 HP |
| Max gate weight | 3,000 lb | 3,000 lb | 4,000 lb |
| Max gate length | 75 ft | 60 ft | 60 ft |
| Battery backup | Not listed | Included (2 × 12V 7Ah) | Included |
| Solar | Not listed | Solar capable | Solar capable |
| App / smart control | myQ Community, myQ Facility | Not listed | Not listed |
| Safety devices included | Photo eye + 5 ft safety edge | Two monitored photo eyes | Two monitored photo eyes |
| Warranty | See LiftMaster | 7 yrs res. / 5 yrs com. | 7 yrs res. / 5 yrs com. |
All-O-Matic figures are from dealer-published spec sheets; confirm with the manufacturer before ordering. Not sure which fits your gate? Ask a specialist
LiftMaster hosts the HDSL24UL documents on its product page, under Installation & Support. Open them there for the latest version.
Quick, safe checks for the most common issues. Never bypass a safety device or force a powered gate.
Still not working? Our technicians service the HDSL24UL every week.
Ask a gate specialistLikely causes: LiftMaster operators stop and sound an alarm after repeated obstructions: a blocked sensor, a binding gate or something in the track.
Safe check: Clear the gate’s path, then reset with the reset button or a remote.
Likely causes: A dirty or misaligned photo eye, a pressed or damaged safety edge, or force settings that no longer match the gate.
Safe check: Wipe the photo-eye lens and reflector and check nothing touches the edge.
Likely causes: A worn backup battery, a charger or power-supply fault, or a tripped breaker.
Safe check: Check the breaker and the operator’s power switch.
Likely causes: Limits that have drifted, a stretched chain, or a gate that has shifted on its track or rollers.
Safe check: Look for debris in the track. Don’t adjust a powered gate.
Likely causes: A dead remote battery, lost programming, or a receiver or antenna problem.
Safe check: Replace the remote battery and try a second remote.
Likely causes: Chain tension, a worn sprocket or idler, a bent gear rack, or failing gate rollers.
Safe check: Stop using the gate if the noise gets worse.
LiftMaster publishes the HDSL24UL installation manual, wiring information and UL 325 troubleshooting guide on its HDSL24UL product page, linked in the Manuals section above.
LiftMaster rates it for slide gates up to 3,000 lb and 75 ft long. For lighter gates the CSL24UL (1,500 lb) is usually enough; for heavier ones, the IHSL24UL goes to 5,500 lb.
LiftMaster’s HDSL24UL page doesn’t list battery backup. Ask us about backup power for your site before you order.
Yes. It is a variable speed operator, set between 0.5 and 1 ft per second. Because speed changes how hard the gate hits an obstruction, have a technician make the change and re-test the safety devices.
LiftMaster lists the LMRRUL (monitored retro-reflective photo eye) and the S505AL (5 ft small-profile resistive edge with aluminum channel) as included with the HDSL24UL.
It is tested to UL 325. External monitored entrapment devices, such as photo eyes and safety edges, must be added and tested on every install.
LiftMaster’s HDSL24UL page doesn’t state the term; check LiftMaster’s warranty page or ask us.
Eagle Automatic Gate & Door is an authorized LiftMaster dealer and installs, replaces and services the HDSL24UL across the Bay Area, starting with a free consultation.
