Barrier Arm Gate BG3000-B3,X3,B3P,x3P parts
LiftMaster BG3000 Barrier Arm Gate Operator Parts
Genuine replacement parts for the LiftMaster BG3000 barrier arm gate operator, covering the B3, X3, B3P and X3P 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. The crank linkage has four separate parts and they are not interchangeable. K07-8003 is the lower crank, K07-8004 the upper crank, 12-8033 the lower rod end and 12-8034 the upper rod end. Upper and lower rod ends have opposite threads. Confirm which end you are replacing before ordering.
2. There are two belts and two pulleys. The standard V-belt is G168001 (4L340); a unit with the battery backup option takes the longer 43 inch 16-20424. The 8 inch K17-2001 and 2 inch 17-2002 pulleys serve different ends of the drive.
3. This is a discontinued platform. The motor assembly, gear box assembly, arm kit, limit switch, limit switch bracket and control box cover are all no longer available from LiftMaster. Where a part is still listed here it is stock on hand.
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 BG3000 Repairs
| Symptom | Usual cause | Parts to check |
|---|---|---|
| Arm does not reach full up or down | Limit cam or limit switch worn | 75-18015 cam, 23-20087, 74-18028 assembly |
| Motor runs, arm does not move | Belt slipping or worn | G168001 standard belt, 16-20424 for battery backup units |
| Arm bounces or moves unevenly | Crank linkage or rod ends worn | 12-8033, 12-8034, 07-8005 crank link |
| Grinding or rumble in the drive | Gear reducer worn | 32-8001 60:1 reducer, 75-18026 gear box |
| Arm loose at the hub | Arm clamp or hub worn | K10-8007M clamp, K07-8007 hub, K11-8031 shaft |
| Operator dead, no response | Control box or switch | 74-18025 control box, 23-20088 DPST switch |
| Cannot open the housing | Access panel lock | G808001 lock, 10-8017 door |
Limit and Control
| Ref | Part # | Description |
|---|---|---|
| 1 | 74-18028 | Limit Switch Assembly — no longer available |
| 2 | 23-20087 | Limit Switch — no longer available |
| 3 | 10-18027 | Limit Switch Support Bracket — no longer available |
| 3 | G808001 | Access Panel Lock (K80-8001) |
| 4 | 75-18015 | Limit Cam Assembly |
| 19 | 74-18025 | Control Box Assembly, without board |
| 20 | 23-20088 | DPST Switch |
| — | 44-18020 | Control Box Cover — no longer available |
Drive and Linkage
| Ref | Part # | Description |
|---|---|---|
| 6 | 32-8001 | Gear Reducer, 60:1 |
| 7 | K17-2001 | Pulley, 8 in |
| 8 | K07-8003 | Lower Crank |
| 9 | 12-8033 | Lower Rod End |
| 10 | 07-8005 | Crank Link |
| 11 | 12-8034 | Upper Rod End |
| 12 | K07-8004 | Upper Crank |
| 14 | K11-8031 | Shaft |
| 15 | G168001 | V-Belt, 4L340 (16-8001) |
| 15 | 16-20424 | Belt, 43 in — battery backup option |
| 18 | 17-2002 | Pulley, 2 in |
| — | 75-18024 | Motor Assembly — no longer available |
| — | 75-18026 | Gear Box Assembly — no longer available |
Arm and Housing
| Ref | Part # | Description |
|---|---|---|
| 16 | 10-18022 | Top Cover |
| 21 | 10-8017 | Door |
| — | K10-8007M | Arm Clamp |
| — | K07-8007 | Arm Hub |
| — | 77-18018 | BG3000 Arm Kit — no longer available |
See also the full LiftMaster gate operator parts catalog.