Models & Key Specifications
The OMJ shares the identical motor, reduction and 36 rpm output shaft as the OMH. The only mechanical difference is the manual override: a floor-level disconnect instead of the Hoist-a-matic chain hoist. This makes the OMJ the leaner choice where hand operation during a power loss is either unnecessary or covered by another exit.
| Specification | Detail |
|---|---|
| Motor | 1/2 HP, 120 V single-phase, 60 Hz, intermittent-duty, open type with instant reverse and internal automatic-reset thermal overload |
| Output shaft speed | 36 rpm |
| Drive | #41 roller chain with 41B12 sprocket |
| Reduction | 5L/B V-belt first stage, then chain and sprockets; 5/8″ input shaft, 1″ output shaft with 1/4″ keyway |
| Brake | Mechanical brake |
| Manual operation | Floor-level disconnect mechanism |
| Duty rating | Medium duty on a standard 120 V circuit |
Where the OMJ Fits Best
- Standard-lift, high-lift and vertical-lift sectional doors
- Small rolling doors and grilles
- Wall, hood or shelf mounting on either side of the opening
- Buildings with a second bay, a pedestrian exit, or gates that can remain closed during an outage
If staff must physically open the door when the power is out, specify the OMH (Hoist-a-matic chain hoist) instead.
What Fails & How We Repair It
The OMJ uses the same externally adjustable friction clutch as the OMH, so clutch wear and adjustment are identical. The disconnect is the unique service point: a floor-level disconnect can be pulled and left disengaged. We have attended multiple calls where the "broken operator" was simply a disconnect handle that hadn't been pushed back in. Always verify the disconnect is fully re-engaged before assuming a mechanical fault.
When the clutch or brake needs attention, we carry the adjustment tools and replacement clutch packs on our trucks. Control boards, solenoid coils, limit-switch assemblies and safety edges are also stocked for same-day repair in most cases.
Choosing Between OMJ and OMH
Check the data plate on the operator housing , it lists the exact model code, voltage and phase. Note the approximate daily cycle count as well; those three details determine which parts we bring on a service call. If the plate reads OMH, the unit has the chain hoist; if it reads OMJ, it has the floor disconnect.
Parts & Accessories We Supply
Manaras offers a full accessory ecosystem for the Opera series: monitored and non-monitored photoelectric cells, light curtains, electric and pneumatic sensing edges, interface modules, push-button and key-switch stations, pull switches, keypads, card readers, radio receivers/transmitters and traffic-light kits.
Common diagnostic tip: On a UL 325 monitored circuit, a failed or misaligned safety device (photo eye or sensing edge) will prevent the door from closing. This is correct safety behaviour, not an operator fault. We test the safety circuit first , it resolves a large share of "door won't close" calls.
We stock control boards, clutches, solenoid coils, limit-switch assemblies and safety edges for the Opera and MEGA lines. Special-order items are sourced through our distributor; we confirm lead times before dispatching a technician.
Service & Installation Across Metro Vancouver
Based in Richmond, we cover Vancouver, Burnaby, Surrey, Delta, North Shore and the Tri-Cities. Pricing is quoted per project , whether it's a new OMJ installation, a clutch replacement, or a safety-device alignment. Call us to schedule a site visit or drop by the shop with your data-plate details.
Call 778-873-7282 for service, parts or a project quote.
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