LiftMaster K75-35400-1 Cover with Access Door for RSW12V and RSW12VH Operators
The K75-35400-1 is a replacement cover assembly with access door for compatible LiftMaster RSW12V and RSW12VH swing gate operators. The cover is the first layer of protection for the control area and internal operator components. In outdoor use, covers can crack from sun exposure, impact, age, or repeated service access, and a damaged cover can shorten the life of the electronics underneath.
This part is often ordered when the existing cover is broken, missing the access door, no longer fastening correctly, or allowing water and insects into the operator. When replacing the cover, inspect the base housing, seal surfaces, hinges, latches, and mounting hardware. A new cover should sit correctly against the enclosure; if the lower housing is warped or cracked, the cover may not seal properly.
Compatible With
Supported references identify this cover with access door for LiftMaster RSW12V and RSW12VH swing gate operators.
- LiftMaster RSW12V swing gate operators
- LiftMaster RSW12VH swing gate operators
- RSW12V / RSW12VH units where the parts breakdown lists K75-35400-1
- Not confirmed as a universal cover for RSL12V, LA400, LA412, LA500, CSW, or CSL operators
Features and Specifications
| Manufacturer | LiftMaster |
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| Product Type | Cover with access door |
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| Part Number | K75-35400-1 |
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| Application | Operator enclosure cover replacement |
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| Compatible Operator Type | Low-voltage swing gate operator |
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| Primary Models | RSW12V, RSW12VH |
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| Notes | Verify cover style and enclosure generation before ordering |
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Also Known As / Related Part Numbers
- K75-35400-1
- 75-35400-1
- LM-K75-35400-1
- Cover With Access Door
- Operator Cover Assembly With Access Door
- RSW12V cover
- RSW12VH cover
Technician Note
A cracked cover is often a sign to inspect the entire operator enclosure. Look for water trails, insect nests, brittle seals, missing screws, and corrosion before simply replacing the cover.
Before Ordering
- Confirm the operator is RSW12V or RSW12VH
- Compare access door position and cover shape to the existing enclosure
- Inspect lower housing and seal surfaces for cracks or warping
- Check that mounting hardware and latch points are still usable
- Do not assume this cover fits RSL slide gate operators or LA/CSW operator boxes
Professional Advisory
If the old cover allowed water into the operator, inspect the control board, battery wiring, and low-voltage connections before returning the gate to daily use.
Important Ordering Warning
Operator covers can look similar across LiftMaster low-voltage models. Verify K75-35400-1 by model and parts diagram before ordering.
Product Questions and Answers
What models use the K75-35400-1 cover?
It is listed for LiftMaster RSW12V and RSW12VH swing gate operators.
Does this cover include an access door?
Yes. The part is described as a cover with access door for compatible RSW operator enclosures.
Will it fit an RSL12V slide gate operator?
Do not assume RSL fitment. This part is supported for RSW12V and RSW12VH applications.
Why replace a gate operator cover?
A damaged cover can allow water, insects, dust, and debris into the operator and may no longer secure the service area properly.
Should the operator be inspected if the cover was broken?
Yes. Check for water intrusion, corrosion, damaged seals, and loose hardware before installing the new cover.
