LiftMaster K75-50146 Arm Assembly Q088
The LiftMaster K75-50146 arm assembly is a replacement drive linkage assembly used on select LiftMaster HCT and HCTDCU overhead gate operator systems. The arm assembly connects the operator movement to the gate hardware and helps keep the travel path controlled under normal open and close cycles. If the existing arm is bent, worn at the pivot points, loose, or damaged from a gate strike, the operator may move unevenly, bind, make noise, or put extra stress on the trolley and drive components. This is a model-specific mechanical service part, not a generic gate arm. Correct fitment depends on the overhead operator model, mounting geometry, and the Q088 reference in the original parts diagram.
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.
Compatible With
- LiftMaster HCT overhead gate operators
- LiftMaster HCTDCU overhead gate operators
- select legacy Elite Hercules overhead gate operator applications where Q088 or K75-50146 is specified.
Compatibility note: Do not confuse this arm assembly with LA, CSW, RSW, or swing gate operator arms. The mounting style and linkage length are different.
Features
- Replacement arm assembly for select LiftMaster overhead gate operators
- Commonly referenced as Elite Q088
- Used in HCT and HCTDCU drive/linkage service work
- Helps restore proper operator-to-gate movement when the original arm is worn or damaged
- Mechanical fit should be confirmed before ordering
Features & Specifications
| Manufacturer | LiftMaster |
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| Product Type | Arm Assembly |
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| Part Number | K75-50146 |
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| Also Known As | K75-50146, 75-50146, Q088, Q88, Elite Q088 |
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| Application | Overhead gate operator arm/linkage replacement assembly |
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| Compatible Operator Type | LiftMaster HCT overhead gate operators; LiftMaster HCTDCU overhead gate operators; select legacy Elite Hercules overhead gate operator applications where Q088 or K75-50146 is specified. |
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| Reference Number | Q088 |
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| Notes | Verify by model number, original part number, and parts diagram before ordering. |
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Also Known As / Related Part Numbers
- K75-50146
- 75-50146
- Q088
- Q88
- Elite Q088
- LiftMaster Q088
- LM-K75-50146
Technician Note
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.
Before Ordering
- Confirm the LiftMaster model number on the operator nameplate.
- Compare the original part number and Q-number with the parts diagram.
- Check mounting holes, linkage shape, cover style, hardware length, or electrical/mechanical configuration as applicable.
- Inspect related worn hardware before replacing only one part.
- For commercial gates, restore all covers and safety equipment before returning the operator to service.
Professional Advisory
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.
Important Ordering Warnings
Do not confuse this arm assembly with LA, CSW, RSW, or swing gate operator arms. The mounting style and linkage length are different.
Product Questions & Answers
What is the LiftMaster K75-50146 used for?
The LiftMaster K75-50146 is a replacement arm assembly used for overhead gate operator arm/linkage replacement assembly. It is ordered when the original part is worn, damaged, missing, or no longer functioning correctly.
Is K75-50146 the same as Q088?
Yes. Q088 is the common Elite or LiftMaster reference number associated with K75-50146. Related search numbers may appear in parts lists, but the installed operator diagram should still be checked.
Which operators is K75-50146 compatible with?
K75-50146 is commonly associated with LiftMaster HCT overhead gate operators; LiftMaster HCTDCU overhead gate operators; select legacy Elite Hercules overhead gate operator applications where Q088 or K75-50146 is specified. Use the exact operator model and parts diagram to confirm final fitment.
What should be checked before ordering K75-50146?
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.
Can this part be used as a universal replacement?
No. K75-50146 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.
