Model OTH is a heavy-duty low headroom trolley operator designed for use on industrial standard lift sectional doors. The operator is available with the new Electronic Control Board (BOARD 070) with or without the option of electrical control for MONITORED external entrapment protection devices (UL325-2010 compliant).

Get Quote



• Motor:
60Hz high starting torque, continuous-duty, single phase capacitor start or 3 phase motor, open drip proof, protected against overload. Also available with 50Hz motor 220V 1 phase and 380V 3 phase motor, consult inside sales.

• Reduction:
First step in reduction 5L/B V-belt drive, additional step by #41 chain and sprockets. Input shaft is 5/8″, supported by precision ball bearings. Output shaft is 1″, supported by ball bearings. Output shaft speed: 120 rpm for a door travel of 12″/s.

• Drive and Trolley Assembly:
#48 (410) full roller chain drive on 1/2 HP and #41 full roller chain drive on 3/4, 1 HP. Dual, 12 gauge, pre-drilled galvanized tracks provided for doors up to 12Ft in height standard. Additional track lengths are available (max. door height acceptable for the operator limit system is 30Ft). Track spacers 3/4″ steel shaft. Trolley made of cast aluminum alloy with chain tension adjustment device.

• Clutch:
Friction type, positioned on input shaft, easily adjustable from outside.

• Manual Operation:
Quick release disconnect arm for manual push-up operation.

• Electrical Enclosure:
All electrical components are in a Nema 1 enclosure. Hinged electrical enclosure cover.

• Limit System:
Rotary-type oil-impregnated steel cams, commercial grade switches. Limit shaft is supported by self-lubricating bronze bushings for increased precision. Remains in time when there is a manual operation or after the motor has been removed.

• Accu-cam® Feature:
Precise and quick one-handed adjustment of the limits.

• Corrosion Protection:
Frame and control enclosure protected by baked on, long lasting enamel finish. All shafts protected by yellow chromate coating.

• Mounting (Low Headroom Design):
Ceiling-mounted with only 6.25″ headroom clearance required below the tracks.


Back Room: door height + 4’5″ (1350 mm)
Head Room For Tracks: 5.625″ (143 mm) above the highest point of door travel


2 Years, per section 6 of our Terms and Conditions of Sale.