LiftMaster K74-34821 Reset Switch Kit for SL575, SL585 and Select Commercial Slide Gate Operators
The LiftMaster K74-34821 reset switch kit is a service replacement for select commercial slide gate operator reset circuits. On SL575, SL585 and related commercial slide gate operators, the reset switch helps restore the operator after certain fault or shutdown conditions. A damaged or unreliable reset switch can create nuisance service calls, intermittent reset response or an operator that cannot be properly returned to service after a fault.
This switch is part of the operator safety and fault recovery system. It is not a general-purpose substitute switch, and it should never be bypassed to keep a gate running. If the operator repeatedly trips, faults or requires reset, the technician should inspect obstruction events, monitored safety devices, drive hardware, limit travel, battery/power condition and control board diagnostics before assuming the switch is the root cause.
Features and Specifications
| Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Reset Switch Kit |
| Part Number | K74-34821 |
| Application | Reset switch replacement for select commercial slide gate operators |
| Compatible Operator Type | LiftMaster commercial slide gate operators |
| Common Model References | SL575, SL585, SL585GL |
| Notes | Match switch style and harness to original operator |
Compatible With
- LiftMaster SL575 commercial slide gate operators where K74-34821 is listed
- LiftMaster SL585 commercial slide gate operators where K74-34821 is listed
- LiftMaster SL585GL slide gate operator applications
- Various LiftMaster commercial slide gate operators when confirmed by parts diagram
Also Known As / Related Part Numbers
- K74-34821
- K7434821
- 74-34821
- LiftMaster reset switch
- SL575 reset switch
- SL585 reset switch
- SL585GL reset switch kit
Technician Note
Do not bypass a reset switch. If the gate keeps requiring reset, inspect fault codes, safety inputs, gate travel, obstruction load, chain tension and power condition before replacing parts blindly.
Before Ordering Checklist
- Confirm the operator is SL575, SL585 or another model that lists K74-34821.
- Compare the mounting style and harness connection to the original switch.
- Check whether the operator has a GL, U or UL suffix.
- Inspect why the operator required reset in the first place.
- Do not bypass or jumper reset/safety circuits.
Professional Advisory
Commercial slide gate operators can start unexpectedly if not secured. Lock out power and have a qualified gate technician service reset, safety and control circuits.
Product Questions and Answers
What does the K74-34821 reset switch do?
It provides the replacement reset switch function used on select LiftMaster commercial slide gate operators after certain fault or shutdown conditions.
Which models is it most commonly associated with?
It is commonly listed for SL575 and SL585 operators, including SL585GL style applications where the parts diagram confirms it.
Can I bypass the reset switch?
No. Bypassing reset or safety-related circuits can create an unsafe gate system.
Will replacing this switch fix repeated operator faults?
Only if the switch is the problem. Repeated resets usually point to a fault condition that needs diagnosis.
Is this the same as a limit switch?
No. A reset switch and a limit switch serve different functions and are not interchangeable by appearance.
