Liftmaster LA500 LA500DC LA500U LA500UL Parts
LiftMaster LA500, LA500DC, LA500U & LA500UL Replacement Parts
Genuine LiftMaster replacement parts for the LA500 family of linear actuator swing gate operators — the 24 VDC heavy-duty arm operators for larger and heavier swing gates, with battery backup and the UL325 K1D8388-1CC main board. All four versions share the same board, bracket, receptacle, transformer kit, batteries and mounting hardware; they differ only in the control box and the arm.
Which control box do I have? Plastic: K74-36798-1 (LA500), K74-36798-4 (LA500U), K74-39307-1 (LA500UL), K74-34582-1 (LA500CONT). Metal: K74-39309-1 (LA500UL) or K94-36894 with the reset switch already fitted. The older LA500 metal box K74-34696-3 is no longer available.
Which arm do I need? LA500, LA500U and LA500UL take K-LA500UL. The LA500DC takes LA500DC for a single gate, plus LA500DCS as the secondary arm on a dual-gate installation.
Battery choice sets the harness. The 7AH build uses K94-36274-1; the 33AH build needs K94-36596 and the K10-36395 tray. Solar installs use K94-37236.
This is a 24 VDC operator. The LA400 family is 24 V but a different platform, and the LA412 family is 18 V — neither shares parts with the LA500.
Common LA500 Repairs
| Symptom | Usual cause | Parts to check |
|---|---|---|
| Gate runs on mains but dies in a power cut | Batteries at end of life | 29-NP712 battery, K74-30762 battery pack, K94-36274-1 harness |
| Operator completely dead | Transformer kit or receptacle | LA500HDTKITSTD transformer kit, K76-36296-1 receptacle |
| No response to remotes, wired controls work | Antenna or receiver module | K77-36541 antenna, K001A5747 receiver module |
| Gate will not reset after an obstruction | Reset switch and its ID resistor | K94-36408-1 reset switch kit, K94-36894 box with switch |
| No warning tone before the gate moves | Piezo alarm failed | K94-36411 piezo alarm |
| Arm hums but the gate does not move | Actuator arm worn out | K-LA500UL arm, or LA500DC / LA500DCS on the DC model |
| Play or knocking at the gate bracket | Mounting bracket or carriage washers | K77-50240 bracket, K77-50336 washer kit |
| Accessories or loops not responding | Expansion board | K1D8387-1CC expansion board |
Standard Control Box
| Ref | Part # | Description |
|---|---|---|
| 1 | K74-36798-1 | Control Box, Plastic — LA500 |
| 1 | K74-36798-4 | Control Box, Plastic — LA500U |
| 1 | K74-39307-1 | Control Box, Plastic — LA500UL |
| 1 | K74-34582-1 | Control Box, Plastic — LA500CONT |
| 2 | K76-36296-1 | Receptacle |
| 3 | K1D8388-1CC | Main Board, Linear Actuators, UL325 |
| 4 | K75-36635 | Control Board Mounting Bracket |
| 5 | 29-NP712 | Battery, 12V, 7AH |
| 6 | K74-30762 | Battery Pack, 12V, 7A |
| 7 | LA500HDTKITSTD | Toroidal Transformer Kit |
| 8 | K1D8387-1CC | Expansion Board, UL325 |
| 9 | K94-36411 | Piezo Alarm |
| 10 | K94-36408-1 | Reset Switch with ID Resistor Kit |
| 11 | K77-50240 | Mounting Bracket, Q230 |
| 12 | K77-50336 | Traveler Carriage Washer Kit, Q232 |
| 13 | 041ASWG-0119 | Release Key, Qty 2 |
| — | K1D8388-1CCU | Upgrade Kit with Eyes, LA, UL325 |
| — | K77-36541 | Antenna |
| — | K77-36389 | Hardware Kit, LA500 |
| — | LA500CONTUL | Control Box, Plastic, LA500CONTUL |
| — | K94-36274-2 | Wire Harness Kit, LA500 |
| — | K94-34778 | Board to Board Wire Harness, 24V |
| — | K001A5747 | Receiver Module, 315MHz |
| — | K74-30754 | Battery Harness |
| — | XLSOLARCONTUL | Solar XL Control Box |
| — | K74-34696-3 | Control Box, Metal, LA500 — no longer available |
| — | K74-39309-1 | Control Box, Metal, LA500UL |
| — | K76-34771 | Metal Receptacle |
| — | K94-36894 | LA500 Metal Box with Reset Switch |
| — | K94-37236 | Solar Harness Kit |
| — | K94-36274-1 | Battery Wire Harness, 7AH |
| — | K94-36596 | Battery Wire Harness, 33AH |
| — | K10-36395 | Battery Tray, 33AH |
Gate Operator Arm
| Ref | Part # | Description |
|---|---|---|
| K1 | LA500DC | Primary 24VDC Actuator Arm — LA500DC, single gate |
| K1 | LA500DCS | Secondary 24VDC Actuator Arm — LA500DC, dual gate |
| K1 | K-LA500UL | Replacement Arm — LA500 / LA500U / LA500UL |
| K2 | K94-36591 | Junction Box with Cable Kit |
| K3 | KSWG-0623 | Rear Connector Kit, LA500 |
Accessories
| Ref | Part # | Description |
|---|---|---|
| — | APOW3 | Transformer |