QY Series Worm Gear Reducer

Input: NEMA C-Face Flange

Motor bolts directly to NEMA C-face — no input coupling, no motor base. Supported frames: 56C, 140TC, 180TC, 210TC. Motor shaft and worm shaft co-axial from factory. NEMA-standard pilot diameter and bolt circle.

Output: NEMA-Standard Hollow Bore

Hollow bore (S diameter, ANSI keyway W×V) seats directly on driven shaft — no output coupling. All QY dimensions in inches, NEMA-compatible. Same bore sizes as UY equivalent.

NEMA C-Face — No Motor Base, No Coupling

Any NEMA C-face motor (56C through 210TC, depending on QY size) bolts directly to the QY input flange — no motor base fabrication, no jaw coupling, no coupling spider to replace on a maintenance schedule. Motor shaft and worm shaft are co-axial from the factory. In North American equipment built to NEMA motor-direct specifications, the QY replaces a failed NEMA C-face worm reducer without requiring any motor base or coupling hardware procurement.

NEMA Pilot Diameter — Perfect Motor Alignment

The QY NEMA C-face includes the standard pilot bore (register) diameter that locates the motor concentrically before the flange bolts are tightened. Motor concentricity is factory-set to within NEMA tolerances — approximately 0.002–0.005″ TIR — without any alignment procedure. The jaw coupling and the misalignment it must tolerate are removed from the drivetrain entirely.

Self-Locking at ≥30:1 — Power-Off Hold

At QY ratios 30:1, 40:1, 50:1, and 60:1, the worm mesh self-locks on power-off — the hollow bore holds the driven shaft stationary without a brake. For North American-specification gate actuators, conveyor drives, and inclined material handling equipment operating in Australian plant, this self-locking matches the original design intent without requiring a separate braking device at these ratios.

Compact Motor-Direct Package — Reduced Machine Envelope

By eliminating the motor base and jaw coupling, the QY reduces the motor-plus-reducer axial length by the sum of the motor base depth plus the coupling body length. In compact North American machine designs where the motor-reducer package must fit within a defined enclosure or machine bay, the QY’s shorter overall drive package length frequently determines whether the drive fits without structural modification.

Like-for-Like Replacement — NEMA C-Face Equipment

North American machinery built around NEMA C-face worm reducers from Dodge, Rexnord, Boston Gear, TB Wood’s, and similar manufacturers uses the same NEMA C-face pilot diameter and bolt circle convention. The QY cross-references directly to these units at matching size and ratio — same CC dimension, same NEMA flange, same output bore. Replacing the QY in the machine requires no re-engineering of the motor or driven shaft connection.

Motor Frame Must Match — Confirm Before Ordering

The QY NEMA C-face accepts only the specific NEMA frames listed for each size (56C, 140TC, 180TC, 210TC per the table above). A 182TC frame motor does not fit a 180TC QY — “TC” frame means inline pilot bore (threaded holes for C-face mount, pilot bore within tolerance). Confirm the motor’s NEMA frame designation against the QY size’s available frame list before ordering. Submitting the motor nameplate frame designation to the technical team before placement avoids frame mismatches on Australian sites where motor frame return and replacement carries significant logistics cost.

NEMA C-Face Motor — Frame Verification First

Before ordering: confirm the motor’s exact NEMA TC or C frame designation against the QY size’s available frame list. 56C, 56HC, 143TC, 145TC, 182TC, 184TC, 213TC, 215TC are the most common NEMA frames — map these to the QY size table. A motor described as “1-1/2 HP NEMA 56C” fits QY sizes 133–375; a “5 HP 184TC” fits QY 262–375 only in the 180TC column.

NEMA C-Face Mounting Hardware

The QY NEMA C-face uses NEMA-standard bolt circle diameter and pilot bore. Motor mounting bolts follow NEMA-standard UNC thread — do not substitute metric screws. For Australian field replacement, source NEMA UNC stainless steel hex cap screws (preferred for corrosion resistance in outdoor installations) before beginning the replacement to avoid work stoppage when metric fasteners from site stock do not fit the NEMA thread pattern.

Oil — AGMA 8 or ISO VG 220 Synthetic

Same specification as UY — AGMA 8 mineral (= ISO VG 220 mineral) for standard service; AGMA 8S synthetic (= ISO VG 220 PAO) for continuous duty above 35°C Australian ambient. The QY thermal rating was developed at AGMA 25°C reference ambient — at 40°C+ Australian summer, verify the thermal rating at your duty cycle before finalising ratio and size for continuous-duty applications at ratios ≥30:1.

Horizontal Base (Optional)

Like the UY, a horizontal mounting base is available for the QY for foot-mount floor or frame installation. Specify at order. For shaft-mount operation without the base, the QY requires a torque arm at the housing to carry the reaction torque and the gravitational moment of the motor-plus-reducer weight. The motor bolted to the QY NEMA C-face adds motor weight to the arm calculation — include motor weight in the torque arm specification.

Output Hollow Bore — ANSI Key and Shrink Disc

QY output hollow bore uses ANSI-standard keyway (W×V in fractional inch). For smooth conveyor loads at small sizes, a set screw is acceptable. For sizes 300 and above at sustained high torque, a shrink disc is recommended — ANSI keyways at these bore sizes provide shorter key engagement length relative to torque than WA-class metric bores, making fretting more likely under cyclic or shock torque if only set-screw secured.

Cross-Reference — Major North American Brands

The QY cross-references directly to NEMA C-face worm reducers from Dodge (Boston Gear), Rexnord, TB Wood’s, Dayton, and Leeson at matching size and ratio. Record the original unit’s CC size, ratio, and NEMA frame from the nameplate before contacting the technical team — three data points are sufficient for a confirmed QY cross-reference without requiring the original unit to be shipped for physical measurement.