The LiftMaster K75-50138 dolly latch kit is a replacement latch component for the dolly or trolley area of select LiftMaster overhead gate operator systems. The latch hardware helps the trolley assembly engage and hold correctly during gate movement. A worn or damaged latch can cause poor engagement, sloppy movement, nuisance release, inconsistent travel, or a gate that does not respond correctly under load. This part is most commonly associated with HCT-style overhead gate operator applications and older Elite Q080 references. Because overhead gate operator trolleys use model-specific latch geometry, this kit should be matched to the original part number or the illustrated parts breakdown before ordering.
This part is best suited for service work where the operator has already been identified and the original part location is known. On older LiftMaster and Elite gate operators, small differences in production date, UL listing generation, enclosure style, arm geometry, or mounting hardware can change which replacement part is correct. For that reason, this product page uses careful compatibility language and includes the common related numbers customers may use when searching for the part.
Compatibility note: Verify the operator model and original Q080 reference. A latch for an HCT overhead operator should not be substituted for slide gate, swing gate, or different trolley hardware.
| Manufacturer | LiftMaster |
|---|---|
| Product Type | Dolly Latch Kit |
| Part Number | K75-50138 |
| Also Known As | K75-50138, 75-50138, Q080, Q80, Elite Q080 |
| Application | Overhead gate operator dolly/trolley latch service part |
| Compatible Operator Type | LiftMaster HCT Series overhead gate operator perimeter access systems; select HCT overhead gate operators; legacy Elite overhead gate operator applications when Q080 or K75-50138 is listed in the parts diagram. |
| Reference Number | Q080 |
| Notes | Verify by model number, original part number, and parts diagram before ordering. |
When replacing this part, inspect the surrounding brackets, fasteners, bushings, pivots, wiring, covers, seals, and drive hardware in the same assembly. A failed support part can sometimes be caused by a misaligned gate, loose mounting hardware, worn clutch parts, or a cabinet that has been exposed to water or debris. Replacing only the visible damaged part without correcting the cause can lead to repeat failures.
Commercial gate operators can move heavy gates and may contain high-voltage wiring, stored mechanical force, or pinch points. Mechanical service should be performed with the gate secured and the operator power disconnected by a qualified technician when needed. Do not bypass monitored safety devices or operate a damaged gate system without proper safety protection.
Verify the operator model and original Q080 reference. A latch for an HCT overhead operator should not be substituted for slide gate, swing gate, or different trolley hardware.
The LiftMaster K75-50138 is a replacement dolly latch kit used for overhead gate operator dolly/trolley latch service part. It is ordered when the original part is worn, damaged, missing, or no longer functioning correctly.
Yes. Q080 is the common Elite or LiftMaster reference number associated with K75-50138. Related search numbers may appear in parts lists, but the installed operator diagram should still be checked.
K75-50138 is commonly associated with LiftMaster HCT Series overhead gate operator perimeter access systems; select HCT overhead gate operators; legacy Elite overhead gate operator applications when Q080 or K75-50138 is listed in the parts diagram. Use the exact operator model and parts diagram to confirm final fitment.
Check the operator model, original part number, Q-number, mounting style, hardware condition, and any model suffix or production-date notes that apply to the installed unit.
No. K75-50138 should not be treated as a universal LiftMaster gate operator part. Similar-looking covers, arms, latches, clutch parts, and hardware kits may use different dimensions or mounting points.