Liftmaster K19-35056, LIMIT SWITCH CHAIN
The LiftMaster K19-35056 limit switch chain is a small but important part of the SL3000U / SL3000UL limit system. Unlike the main drive chain that moves the gate, the limit chain helps transfer movement to the limit switch assembly so the control system knows where the gate should stop. If this chain breaks, skips, or becomes loose, the operator can lose accurate open and close positioning. Replacing the chain can help restore consistent limit actuation, but the limit sprockets, limit nuts, collars, and switch hardware should also be inspected. After replacement, the gate limits normally need to be checked and adjusted by a qualified technician.
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Limit switch chain |
| Part Number | K19-35056 |
| Application | Limit switch drive/positioning system |
| Compatible Operator Type | SL3000U and SL3000UL slide gate operators |
| Function | Helps operate the limit switch assembly for open and close position control |
| Notes | Inspect limit sprockets and reset limits after replacement |
Compatible With
This part may be used with the following operators or product families when the original part number and parts diagram match:
- LiftMaster SL3000U commercial slide gate operators
- LiftMaster SL3000UL commercial slide gate operators
- Select SL3000U-series limit switch assemblies using K19-35056
- Do not use as a main drive chain; this is a limit switch chain
Also Known As / Related Part Numbers
- K19-35056
- 19-35056
- 1935056
- LiftMaster limit switch chain
- SL3000U limit chain
- SL3000UL limit switch chain
Technician Note
Chain, spring, and limit-system parts should be matched by the original part number and by the operator parts diagram. Similar-looking parts can vary by chain size, pitch count, spring dimension, operator generation, finish, and whether a master link is included.
Before Ordering Checklist
- Confirm the manufacturer part number on the old part or parts diagram
- Verify the operator model and generation
- Compare chain size, pitch count, finish, spring size, or kit contents as applicable
- Inspect related sprockets, bearings, clips, brackets, and limit hardware for wear
- Do not substitute a different chain size, spring, or master link without confirming the parts diagram
Professional Advisory
Gate operators, barrier systems, and traffic control equipment include moving mechanical parts that can create pinch, crush, or stored-tension hazards. Disconnect power where required and use a qualified gate technician when servicing drive chains, limit systems, torsion springs, or traffic spike hardware.
Product Questions & Answers
Is K19-35056 the main gate drive chain?
No. K19-35056 is a limit switch chain, not the main drive chain that moves the slide gate.
What models use this limit chain?
It is commonly listed for LiftMaster SL3000U and SL3000UL commercial slide gate operators.
What happens if the limit chain fails?
The gate may lose accurate open or close stopping points, overtravel, or fail to set limits correctly.
Do the limits need adjustment after replacement?
Yes. The limit system should be checked and adjusted after replacing the chain.
What other parts should be inspected?
Inspect limit sprockets, limit nuts, collars, switches, and any worn hardware in the limit assembly.
