LiftMaster SJ Speed Jack Operator Parts
Genuine replacement parts for the LiftMaster SJ Speed Jack operator itself — the motor, limit gear reducer, brake and mounting hardware. The starter panel that drives it is a separate assembly with its own parts pages, linked at the bottom.
The motor is model specific. Match yours from the table below using the model number on the operator's data label. Parts marked no longer available have been discontinued and are listed for identification only.
Which Motor Do I Need?
| Model |
Part # |
Description |
| SJ1011, SJ1021 |
K20-1100C-2P |
Motor — single phase models |
| SJ1023, SJ1043 |
K20-3100C-4 |
Motor — three phase models |
| SJ1053 |
K20-3100M-5 |
Motor — 575V three phase (K20-3100M-5-H25) |
Drive Assembly
Brake Assembly — B Group
| Ref |
Part # |
Description |
| B3 |
36-16803 |
Brake with Disconnect |
| B1 |
08-16114-1 |
Housing (no longer available) |
| B2 |
11-16112-1 |
Extension Shaft (no longer available) |
| B4 |
80-16113 |
Step Key (no longer available) |
| B5 |
82-NH10-04 |
Set Screw, #10-32 x 1/4" (no longer available) |
Mounting Hardware — M Group
| Ref |
Part # |
Description |
| M3 |
28-3004 |
1 Gang Blank Cover |
| M1 |
27-17190 |
Nipple, 1/2" x 3" (no longer available) |
| M2 |
28-3003 |
Mulberry Mounting Box (no longer available) |
Options & Safety
| Part # |
Description |
| CPICARD |
CPI interface box |
| CPS-U |
Commercial photo eye |
| CPSUN4G |
Monitored through-beam photo eyes |
| CPS |
Safety eye sensors — mechanical operators |
| CPS-UN4 |
Safety eye sensors — commercial doors |
| K77-16011 |
Mounting hardware, CPS N4 |
| 65-5302 |
Pneumatic sensing edge, 22 ft, with take-up reel |
| LC-36A |
Safety eye sensors (no longer available) |
Starter Panel Parts
The Speed Jack's electrical starter is a separate assembly: SJ1011, SJ1021, SJ1023 and SJ1043 starter · SJ1053 wall-mounted starter
