Electrical Box: L4 for T, GT, GH Operators
LiftMaster Electrical Box Parts — L4 for T, GT and GH Operators
Genuine replacement parts for the Logic Control Version 4 electrical box fitted to LiftMaster T trolley, GT gear-reduced trolley and GH gear-reduced hoist operators.
L3 or L4? The box, enclosure and internal layout are the same on both. The difference is the logic board — L4 uses the K001A6837. If you are not sure which you have, read the part number printed on the board itself. The L3 page carries the exploded diagram, and the component positions are identical.
Single-phase and three-phase machines take different C relays and different limit shaft kits. Check the data label before ordering. Parts marked no longer available have been discontinued and are listed for identification only.
Single Phase or Three Phase?
| Supply | C Relay | Limit Shaft Kit |
|---|---|---|
| 1 phase | 29-31229 — 24VDC SPDT | K72-10047 |
| 3 phase | 29-31245 — 12VDC SPDT (C & D) | K72-10047-1 |
Box Components
| Ref | Part # | Description |
|---|---|---|
| 3 | K75-35627 | Cover |
| 4 | 21-14182 | Transformer, 115/230V (K21-14182) |
| 4 | K21-35057 | Transformer, 460V |
| 4 | 21-35077 | Transformer, 575V (K21-35077) |
| 5 | 29-31244 | Relay, 24VDC DPST — A and B relay, all operators (K29-31244) |
| 6 | 29-31229 | Relay, 24VDC SPDT — C relay, single phase only |
| 6 | 29-31245 | Relay, 12VDC SPDT — C and D relay, three phase only |
| 7 | K74-31243 | MOV, 580V — surge protection |
| 8 | K79-15016-1 | RPM Sensor Assembly |
| 12 | 42-31247 | Terminal Block (K42-31247) |
| 13 | 42-10040 | Terminal Block, radio (K42-10040) |
Logic Board & Radio
| Ref | Part # | Description |
|---|---|---|
| 9 | K001A6837 | Logic Board, L4 (no longer available) |
| — | TLS1CARD | Logic 4 Option Board |
| 10 | K2A761 | Coaxial Cable (K002A0761) |
| 11 | K1C3196-3 | Antenna (109186) |
Limit Shaft & Switch Kits — K Groups
| Ref | Part # | Description |
|---|---|---|
| K1 | K72-10047 | Limit Shaft Kit — single phase |
| K1 | K72-10047-1 | Limit Shaft Kit — three phase |
| K2 | K72-12515-1 | Limit Switch Kit |
Other Electrical Box Versions
L3 for T, GT, GH · L4 for J, H, HJ · L3 for J, H, HJ · Logic Control Version 2