LDO33: 1/3 HP Standard Single Lamp Garage Door Operator

The Nortek Security & Control Family of Brands

Single-lamp 1/3 HP residential garage door operator compatible with belt & chain drive rails.


  • Compatible with belt-drive or chain-drive T or I beam rails up to 10′
  • Rock solid performance
  • Diagnostic system indicates six possible trouble conditions
  • 100-watt courtesy light (bulb not included)
  • Built-in MegaCode format receiver
  • All operator controls and indicators on one side
  • Operator includes three-button MCT-3 visor transmitter and deluxe wall station


  • 10 years – Motor
  • Lifetime – Belt
  • 5 years – Chain rails HCT7C, HCT8C, HTC10C
  • 5 years – Mechanical parts
  • 1 year – Electrical

Overall Length

  • LDO33 with HBT7C/HCT7C: 122″
  • LDO33 with HBT8C/HCT8C: 137.5″
  • LDO33 with HCT10C: 157″


Accessories for use with the LDO33
MDTKKeypad Transmitter
Models compatible with the LDO33
ACT-21A1-Channel Key Ring Transmitter
ACT-21B1-Channel Block Coded Key Ring Transmitter
ACT-22A3-Channel Key Ring Transmitter
ACT-22B3-Channel Block Coded Key Ring Transmitter
ACT-31B1-Channel Block Coded Key Ring Transmitter
ACT-34B4-Channel Block Coded Key Ring Transmitter
ACT-31D1-Channel Block Coded Key Ring TRANS PROX Transmitter
& Proximity Tag
ACT-34D4-Channel Block Coded Key Ring TRANS PROX Transmitter
& Proximity Tag
FT-1Radio Interference Field Tester
MCT-11-Channel Visor Transmitter
MCT-22-Channel Visor Transmitter
MCT-33-Channel Visor Transmitter
MCT-111-Channel Visor Transmitter
MDKPExterior Wireless Keypad
MDR1-Channel Receiver
MDR-22-Channel Receiver
MDRG1-Channel Gate Receiver
MDR/U1-Channel Plug-in Receiver
MDT-1A1-Channel Visor Transmitter
MDT-1B1-Channel Block Coded Visor Transmitter
MDT-2A3-Channel Visor Transmitter
MDT-2B3-Channel Block Coded Visor Transmitter
MDT-4A5-Channel Visor Transmitter
MDT-4B5-Channel Block Coded Visor Transmitter
MT-1B1-Channel Block Coded Visor Transmitter
MT-2B2-Channel Block Coded Visor Transmitter
SMDRG1-Channel Gate Receiver


WARNING: This product can expose you to chemicals including 1,3-Butadiene, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov