LiftMaster Electrical Box Parts — L3 for J, H and HJ Operators
Genuine replacement parts for the Logic Control Version 3 electrical box fitted to LiftMaster J jackshaft, H hoist and HJ hoist-jackshaft industrial operators.
Single-phase and three-phase machines take different C relays — ref 4 below. 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 |
Notes |
| 1 phase |
29-31229 — 24VDC SPDT |
C relay only |
| 3 phase |
29-31245 — 12VDC SPDT |
Serves both C and D positions |
Box Components
| Ref |
Part # |
Description |
| 1 |
K75-32269 |
Cover |
| — |
K75-36913 |
E-Box Cover — R, J, H, HJ and L5 |
| 2 |
21-14182 |
Transformer, 115/230V (K21-14182) |
| 2 |
K21-35057 |
Transformer, 460V |
| 2 |
21-35077 |
Transformer, 575V (K21-35077) |
| 3 |
29-31244 |
Relay, 24VDC DPST — A and B relay, all operators (K29-31244) |
| 4 |
29-31229 |
Relay, 24VDC SPDT — C relay, single phase only |
| 4 |
29-31245 |
Relay, 12VDC SPDT — C and D relay, three phase only |
| 5 |
K74-31243 |
MOV, 508V — surge protection |
| 6 |
K79-15016-1 |
RPM Sensor Assembly |
| 12 |
42-31247 |
Terminal Block (K42-31247) |
| 13 |
42-10040 |
Terminal Block, radio (K42-10040) |
| — |
K74-MODELH |
Wiring Harness — Model H |
Logic Boards & Option Cards
| Ref |
Part # |
Description |
| 7 |
K001A5729 |
Logic Board, L3 (no longer available) |
| — |
K001A6837 |
Logic Board, L4 (no longer available) |
| 8 |
K2A761 |
Coaxial Cable (K002A0761) |
| — |
TLS1CARD |
Logic 4 Option Board |
| — |
CPS3CARD |
CPS3 monitored sensor card (041K0811) |
| — |
CPICARD |
CPI interface box |
Limits — L, K Groups
Options & Safety
| Part # |
Description |
| 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) |
Other Electrical Box Versions
L3 for T, GT, GH · Logic Control Version 2 · Contactor Style · MT, BMT, MJ, MH, HMJ
