Slide Gate SL1000-X3, B3, X3P, B3P parts
LiftMaster SL 1000-X3 Slide Gate Operator Parts
Genuine replacement parts for the LiftMaster SL 1000 series commercial slide gate operator, covering the X3, B3, X3P and B3P builds. Use the exploded view above with the tables below to identify what you need, then click any part number to order.
Before you order — three things to check.
1. Most SL 1000 parts are service kits, not loose components. Items 11 through 26 are all K-prefixed service kits — the limit shaft, limit box, disconnect, motor and control box all ship as complete assemblies. If you are replacing a single worn item inside one of those areas, you are ordering the kit.
2. X3 and B3 are different control generations. The X3 uses the SN1110173-K control board; the B3 has its own board and its own installation manual. The drive belt also differs — a standard unit takes the 30 inch 16-4L300, while a B3 or X3 with battery backup takes the 40 inch 16-20423. Check which one is on your machine before ordering.
3. The disconnect has three separate kits. K75-18570 is the actuator arm, K75-18953 is the release handle, and K75-18954 is the complete disconnect. Ordering the complete kit when you only need the handle is an expensive mistake, and ordering the handle when the arm is bent will not fix the gate.
Part numbers shown as plain text rather than links are no longer available from the manufacturer. They are listed so you can identify what you have.
Common SL 1000-X3 Repairs
| Symptom | Usual cause | Parts to check |
|---|---|---|
| Motor runs but gate does not move | Belt slipping or worn | 16-4L300 belt, 17-20115 pulley, idler pulley (Ref 19) |
| Gate overruns the stop point | Limit switch or limit shaft worn | 23-10041, Limit Shaft Kit K72-18952, Limit Box Kit K74-18962 |
| Gate will not release by hand | Disconnect seized or arm bent | K75-18570 actuator arm, K75-18953 release handle, K75-18954 complete |
| Operator dead, no display | Control board or power cable | SN1110173-K control board, Power Cable Kit K94-20221 |
| Gate reverses for no reason | Obstruction sensing or motor cable | Motor Cable Kit K94-20021, control board |
| Grinding or rumble under load | Gear reducer or compound sprocket | 32-18887, K75-18553 |
| Alarm sounds continuously | Two consecutive obstruction faults | 76-20012 alarm, then clear the fault at the board |
Replacement Parts — Shown on Diagram
| Ref | Part # | Description |
|---|---|---|
| 1 | 10-20065 | Shelf — no longer available |
| 2 | 16-4L300 | Belt, 30 in (Q042) |
| 3 | 17-20115 | Pulley, 2.5 in dia, 5/8 in bore |
| 4 | 20-1050B-1R | Motor, 1/2 HP (stocked as Q018 / K20-1050B-1RL) |
| 5 | 23-10041 | Limit Switch (Qty 2) |
| 6 | 23-10916 | SPDT Interlock Switch |
| 7 | 23-20088 | Switch, DPST On/Off |
| 8 | 32-18887 | Gear Reducer |
| 9 | 41-20066 | Control Box Cover |
| 10 | 85-FW-67C | Washer, 3/4 in OD, 7/8 in ID |
| 11 | K72-18952 | Service Kit, Limit Shaft — no longer available |
| 12 | K74-18962 | Service Kit, Limit Box |
| 13 | K75-18553 | Service Kit, Compound Sprocket — no longer available |
| 14 | K75-18570 | Service Kit, Disconnect Actuator Arm — no longer available |
| 15 | K75-18953 | Service Kit, Disconnect Release Handle |
| 16 | K75-18954 | Service Kit, Disconnect Complete — no longer available |
| 17 | K75-20026 | Service Kit, Motor — no longer available |
| 18 | K75-20030-G | Service Kit, Cover — supplied as K75-20030, no longer available |
| 19 | K75-20156 | Service Kit, Idler Pulley — pulley stocked separately as 13-20070, no longer available |
| 20 | K76-20012 | Alarm Assembly (supplied as 76-20012) |
| 21 | K76-20030 | Service Kit, Control Box — superseded, stocked as 76-20018, no longer available |
| 22 | K78-18888 | Service Kit, Metal Chassis |
| 23 | K94-20021 | Service Kit, Motor Cable — no longer available |
| 24 | K94-20133 | Service Kit, Limit Cable — supplied as 94-20133, no longer available |
| 25 | K94-20221 | Service Kit, Power Cable — supplied as 94-20221, no longer available |
| 26 | SN1110173-K | Service Kit, X3 Control Board |
Parts Not Shown
| Ref | Part # | Description |
|---|---|---|
| — | 07-20042 | Gate Anchor — no longer available |
| — | 40-3505 | DASMA Warning Placard |
| — | 80-20079 | 7/8 in Bushing (Qty 2) — no longer available |
| — | K77-20017 | Service Kit, Hardware |
| — | 13-20067 | Limit Nut — no longer available |
Drive Chain and Belts
| Ref | Part # | Description |
|---|---|---|
| — | 16-20423 | Belt, 40 in — B3 and X3 operators with battery backup |
| — | K19-3020 | Drive Chain, #40, 20 ft, nickel plated — no longer available |
Manuals
| Ref | Part # | Description |
|---|---|---|
| — | 01-20098 | Manual, X3 Installation |
| — | 01-20101 | Manual, X3 Master/Slave |
| — | 01-G0582 | Gate Safety Brochure |
See also the full LiftMaster gate operator parts catalog.