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- Lids
- Bottoms
- Compactor Parts
- Commercial Dumpster Parts
- Roll-Off Container Parts
- Refuse Body Truck/Roll-off Hoist Parts
- Lids
- Bottoms
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Compactor Parts
Power UnitsElectrical PartsLimit/Safety/Photo/Press. SwitchesButtons/Switches/Keys/LegendsHydraulic PartsCylindersOther Compactor Parts30 MMPanels And ControlsMotorsMotor Starters / Transformers / FusesAccessories Electrical30 MM Key Switch30 MM Selector Switch30 MM Push Only Switch30 MM Legends30 MM Contacts And Replacement Keys22.5 MM
- Commercial Dumpster Parts
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Refuse Body Truck/Roll-off Hoist Parts
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Compactor Motors — Single Phase & Three Phase
Replacement electric motors for industrial trash compactors — single phase and three phase, from 5HP to 25HP. Direct drop-in for Marathon, PTR, Wastequip, Harmony, and SP Industries compactors. Motor accessories (mounting brackets, couplings, flanges) also in stock.
What this page covers
The motor is the muscle of the compactor — it drives the hydraulic pump that pressurizes the ram cylinder. When a motor fails or burns out, the compactor stops working entirely. PRT stocks OEM-spec replacement motors in the configurations used across the industry: single phase 5HP for vertical and small commercial compactors, three phase 5-25HP for stationary and self-contained applications.
Motor failures are usually predictable — bearing wear, winding insulation breakdown from age, thermal damage from overload, or starter contact damage that overstresses the windings. Most operators replace motors every 8-12 years in standard commercial service; abusive routes can shorten that to 4-6 years.
How to choose
Identify the motor by horsepower (typically on the motor data plate), voltage and phase (single phase 110/220V or three phase 208/230/480V), frame size (NEMA frame number — 56, 143T, 145T, 182T, 184T are most common for compactors), and shaft style (foot-mount with belt drive, or close-coupled to the hydraulic pump).
If the motor data plate is unreadable, send PRT a photo of the motor and the existing pump assembly. We can usually identify the right replacement from the frame number stamped on the motor casting and the pump model.
Motor categories
- Single Phase Motors5HP at 110V or 220V — for vertical and small commercial compactors.
- Three Phase Motors5-25HP at 208/230/480V — for stationary and self-contained industrial compactors.
- Motor AccessoriesMounting brackets, couplings, flanges, shaft keys, motor pulleys.
- Close-coupled motorsDirect pump-mount for compact power unit installations.
- Foot-mount motorsStandard belt-drive installations with separate pump.
- TEFC enclosuresTotally Enclosed Fan Cooled — standard for compactor service.
Frequently asked questions
How do I know what size compactor motor I need?
The motor data plate lists horsepower, voltage, phase, and frame size. Match all four when ordering a replacement. If the plate is unreadable, the original power unit's spec sheet or PRT customer service can identify the right motor from the compactor model.
Are PRT compactor motors OEM-spec?
Yes. PRT motors use standard NEMA frame sizes (56, 143T, 145T, 182T, 184T) and OEM-equivalent electrical specs. They drop into Marathon, PTR, Wastequip, Harmony, and SP Industries compactor mounting locations.
How long does a compactor motor typically last?
8-12 years in standard commercial service. High-cycle industrial routes (food-service compactor receivers, multi-shift manufacturing) can shorten that to 4-6 years. Motor bearing wear is the most common end-of-life condition.
Can I upgrade a single phase motor to three phase if I add three phase electrical service?
Yes, but the upgrade requires a new motor (windings are different), a new motor starter, and updated control wiring. Most operators upgrade the whole power unit rather than just the motor.