Models and Key Specifications
| Item | Detail |
|---|---|
| Motor | 60 Hz high starting torque, continuous-duty; single-phase capacitor start or 3-phase; open drip-proof with enclosed ends or drip cover |
| Reduction | 45:1 worm gear in oil bath reducer with air breather and sealed ball bearings |
| Output shaft | 1" with 1/4" keyway up to 1 HP; 1-1/4" with 1/4" keyway above 1 HP |
| Drive | #50 roller chain with 50B12 sprocket |
| Brake | Electrically activated drum-band solenoid brake |
| Manual operation | Hoist-a-matic self-engaging hoist with automatic cut-off; electrical interlock cuts motor power when engaged |
| Duty rating | Heavy-duty industrial with worm gear reduction |
Typical Applications
The OGH suits industrial high-lift and vertical-lift sectional doors, rolling doors, and grilles. The oil-bath worm gear delivers consistent torque under sustained load without the belt-tension checks a V-belt drive requires. It's the sensible spec when door weight and long maintenance intervals drive the decision.
What Fails and How We Repair It
The reducer needs its oil. Level and condition are maintenance items , a unit run low or contaminated is how a long-lived gearhead dies early. The air breather matters too: if blocked, it pressurizes the housing and forces oil past the seals. Beyond the reducer, we regularly replace solenoid brakes, drive chains, and sprockets. Our Richmond shop stocks common wear items for the Opera and MEGA series, so most repairs happen in a single visit.
Choosing Between Models
The MGH is the larger 40:1 worm gear unit for even heavier doors. If you're unsure which operator you have, check the data plate on the housing , note the model code, voltage, phase, and approximate daily cycles. Those three facts determine what we bring to the call.
Parts and Accessories
Manaras publishes a full accessory range for this operator: monitored and non-monitored photoelectric cells, light curtains, electric and pneumatic sensing edges, interface modules, push-button and key-switch control stations, pull switches, keypads, card readers, radio receivers and transmitters, and traffic-light kits. One common point of confusion: on a UL 325 monitored circuit, a failed safety device makes the operator refuse to close. That's correct behavior, not a malfunction. A door that suddenly won't close with no other symptom is often a photo eye or sensing edge that has failed or drifted out of alignment.
Manufacturer Documentation
Original Manaras-Opera documents are available if the paperwork for your installed unit is missing: specification sheet, drive spec sheet, sell sheet, dimension drawing, gearhead manual, and shop drawing.
Getting Service in Metro Vancouver
We install, maintain, and repair Manaras commercial operators throughout the Lower Mainland. Pricing is quoted per project based on door specs, voltage, and access. Call 778-873-7282 to schedule a service call or discuss a replacement.
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