{"title":"PRO 3+ HP Vibrator Motor Assembly Parts","description":"\u003cp\u003e\u003cstrong\u003eShop genuine OEM parts for the Northrock PRO 3+ (25L3 \/ 25L3QD) 3 HP electric concrete vibrator motor.\u003c\/strong\u003e Click any numbered callout on the diagram below to jump to the exact part. Part numbers match the official Northrock service manual.\u003c\/p\u003e\n\n\u003cp\u003eDanseUSA is an authorized Northrock dealer. Orders placed before 12 PM ET ship same business day when in stock. Not sure which part? Email \u003ca href=\"mailto:customerservice@danseusa.com\"\u003ecustomerservice@danseusa.com\u003c\/a\u003e with your motor's model and serial number.\u003c\/p\u003e\n\n\u003ch2\u003eHow to Use the Diagram\u003c\/h2\u003e\n\u003cp\u003eMatch the Ref # on the exploded view to the row in the parts list. Click the callout → product page → add to cart. Always replace wear parts (brushes, bearings, seals) in pairs.\u003c\/p\u003e\n\n\u003ch2\u003eMost Commonly Replaced Parts on the PRO 3+ (25L3)\u003c\/h2\u003e\n\u003cp\u003eAbout 80% of PRO 3+ service issues come down to these six parts. The PRO 3+ runs at higher amp draw than the PRO 1.5+ and PRO 2+, so brushes and bearings wear faster under continuous-duty loads — diagnose in this order before replacing anything larger:\u003c\/p\u003e\n\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n\u003cth\u003eRef #\u003c\/th\u003e\n\u003cth\u003ePart\u003c\/th\u003e\n\u003cth\u003eP\/N\u003c\/th\u003e\n\u003cth\u003eTypical Life\u003c\/th\u003e\n\u003cth\u003eSymptom\u003c\/th\u003e\n\u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e21\u003c\/td\u003e\n\u003ctd\u003eCarbon Brush (pair)\u003c\/td\u003e\n\u003ctd\u003e490A1\u003c\/td\u003e\n\u003ctd\u003e150–350 hrs\u003c\/td\u003e\n\u003ctd\u003eWeak under load, heavy sparking, burn smell\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e32\u003c\/td\u003e\n\u003ctd\u003eAir Filter\u003c\/td\u003e\n\u003ctd\u003e470B1\u003c\/td\u003e\n\u003ctd\u003e40 hrs\u003c\/td\u003e\n\u003ctd\u003eMotor runs hot, thermal cutout\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003ctd\u003eBall Bearing (pair)\u003c\/td\u003e\n\u003ctd\u003e140C300\u003c\/td\u003e\n\u003ctd\u003e400–1,200 hrs\u003c\/td\u003e\n\u003ctd\u003eGrinding, squealing, shaft wobble\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e19\u003c\/td\u003e\n\u003ctd\u003ePower Cord\u003c\/td\u003e\n\u003ctd\u003e505J1\u003c\/td\u003e\n\u003ctd\u003eAs needed\u003c\/td\u003e\n\u003ctd\u003eNicks, cracked strain relief, bad plug\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e28\u003c\/td\u003e\n\u003ctd\u003eElectric Switch\u003c\/td\u003e\n\u003ctd\u003e425B1\u003c\/td\u003e\n\u003ctd\u003eAs needed\u003c\/td\u003e\n\u003ctd\u003eMushy, sticks, won't toggle cleanly\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e31\u003c\/td\u003e\n\u003ctd\u003eSwitch Seal\u003c\/td\u003e\n\u003ctd\u003e430A1\u003c\/td\u003e\n\u003ctd\u003eReplace with switch\u003c\/td\u003e\n\u003ctd\u003eWater intrusion, visible wear\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePRO 3+ (25L3) Full Parts List\u003c\/h2\u003e\n\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n\u003cth\u003eRef #\u003c\/th\u003e\n\u003cth\u003eDescription\u003c\/th\u003e\n\u003cth\u003ePart #\u003c\/th\u003e\n\u003cth\u003eQty\u003c\/th\u003e\n\u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003ctd\u003eScrew\u003c\/td\u003e\n\u003ctd\u003e190F150\u003c\/td\u003e\n\u003ctd\u003e11\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003eEnd Cap\u003c\/td\u003e\n\u003ctd\u003e215M1\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003ctd\u003eBolt\u003c\/td\u003e\n\u003ctd\u003e280A225\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003ctd\u003eLock Washer\u003c\/td\u003e\n\u003ctd\u003e285A250\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003ctd\u003eEnd Bell (3 HP specific)\u003c\/td\u003e\n\u003ctd\u003e420D1\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003ctd\u003eBaffle Filter (End Bell Side, 3 HP specific)\u003c\/td\u003e\n\u003ctd\u003e470F1\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e7\u003c\/td\u003e\n\u003ctd\u003eSpring Washer\u003c\/td\u003e\n\u003ctd\u003e380A1\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003ctd\u003eBall Bearing\u003c\/td\u003e\n\u003ctd\u003e140C300\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e9\u003c\/td\u003e\n\u003ctd\u003eArmature (3 HP specific)\u003c\/td\u003e\n\u003ctd\u003e475C1\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003ctd\u003eScrew\u003c\/td\u003e\n\u003ctd\u003e190E140\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e11\u003c\/td\u003e\n\u003ctd\u003eLock Washer\u003c\/td\u003e\n\u003ctd\u003e285A187\u003c\/td\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003ctd\u003eField Coil (3 HP specific)\u003c\/td\u003e\n\u003ctd\u003e480C1\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e13\u003c\/td\u003e\n\u003ctd\u003eCommutator Service Port Cap\u003c\/td\u003e\n\u003ctd\u003e400B1\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e14\u003c\/td\u003e\n\u003ctd\u003eMotor Housing (3 HP specific)\u003c\/td\u003e\n\u003ctd\u003e105AG1\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e15\u003c\/td\u003e\n\u003ctd\u003eBolt\u003c\/td\u003e\n\u003ctd\u003e280A312\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e16\u003c\/td\u003e\n\u003ctd\u003eLock Washer\u003c\/td\u003e\n\u003ctd\u003e285A312\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e17\u003c\/td\u003e\n\u003ctd\u003eWasher\u003c\/td\u003e\n\u003ctd\u003e370A312\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e18\u003c\/td\u003e\n\u003ctd\u003eFrame Assembly (3 HP specific)\u003c\/td\u003e\n\u003ctd\u003e440D1\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e19\u003c\/td\u003e\n\u003ctd\u003eGrounded Power Cord (heavy gauge)\u003c\/td\u003e\n\u003ctd\u003e505J1\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003ctd\u003eBrush Holder\u003c\/td\u003e\n\u003ctd\u003e495A1\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e21\u003c\/td\u003e\n\u003ctd\u003eCarbon Brush\u003c\/td\u003e\n\u003ctd\u003e490A1\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e22\u003c\/td\u003e\n\u003ctd\u003eBrush Cap\u003c\/td\u003e\n\u003ctd\u003e500A1\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e23\u003c\/td\u003e\n\u003ctd\u003eOuter Protective Brush Cap\u003c\/td\u003e\n\u003ctd\u003e400C1\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e24\u003c\/td\u003e\n\u003ctd\u003eCord Mounting Plate\u003c\/td\u003e\n\u003ctd\u003e215CC1\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e25\u003c\/td\u003e\n\u003ctd\u003eScrew\u003c\/td\u003e\n\u003ctd\u003e190F875\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e26\u003c\/td\u003e\n\u003ctd\u003eSet Screw\u003c\/td\u003e\n\u003ctd\u003e190B125\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e27\u003c\/td\u003e\n\u003ctd\u003eWire Clip\u003c\/td\u003e\n\u003ctd\u003e467C1\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e28\u003c\/td\u003e\n\u003ctd\u003eElectric Switch\u003c\/td\u003e\n\u003ctd\u003e425B1\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e29\u003c\/td\u003e\n\u003ctd\u003eSwitch Mounting Plate\u003c\/td\u003e\n\u003ctd\u003e215CB1\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003eScrew\u003c\/td\u003e\n\u003ctd\u003e190F850\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e31\u003c\/td\u003e\n\u003ctd\u003eWater-Resistant Switch Seal\u003c\/td\u003e\n\u003ctd\u003e430A1\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e32\u003c\/td\u003e\n\u003ctd\u003eAir Filter (3 HP specific, larger)\u003c\/td\u003e\n\u003ctd\u003e470B1\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e33\u003c\/td\u003e\n\u003ctd\u003eAir Filter Cover (3 HP specific)\u003c\/td\u003e\n\u003ctd\u003e215X1\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e34\u003c\/td\u003e\n\u003ctd\u003eCore Adapter\u003c\/td\u003e\n\u003ctd\u003eSee compatibility chart\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e35\u003c\/td\u003e\n\u003ctd\u003eCasing Adapter\u003c\/td\u003e\n\u003ctd\u003eSee compatibility chart\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eRepair Tips\u003c\/h2\u003e\n\n\u003ch3\u003eBrush replacement (Ref #21, P\/N 490A1)\u003c\/h3\u003e\n\u003cp\u003eUnplug cord. Remove outer brush cap (400C1) and brush cap (500A1). Pull old brush. If carbon is under 1\/4\" or cracked, replace \u003cstrong\u003eboth brushes as a pair\u003c\/strong\u003e. Check commutator for glazing — light glaze is OK, grooves or pits mean the armature needs service. The PRO 3+ wears brushes faster than the smaller motors due to higher amp draw; check every 150 hours on continuous-duty applications. Reinstall caps finger-tight plus 1\/8 turn.\u003c\/p\u003e\n\n\u003ch3\u003eBearing replacement (Ref #8, P\/N 140C300)\u003c\/h3\u003e\n\u003cp\u003eTwo sealed bearings, one each end of the armature. Always replace as a pair. Before running the motor again, pull the flex shaft core and check lubrication — a dry core cooks new bearings within 50 hours, and the PRO 3+ is often run with long 21 ft or connected shafts that consume more driveline power. Apply a 1\/16\" coat of lithium grease to the core; do not over-grease.\u003c\/p\u003e\n\n\u003ch3\u003eModel-specific parts — do not cross-swap\u003c\/h3\u003e\n\u003cp\u003eThe PRO 3+ has \u003cstrong\u003emore unique parts than the 1.5+ or 2+\u003c\/strong\u003e. The armature (475C1), field coil (480C1), end bell (420D1), motor housing (105AG1), frame assembly (440D1), baffle filter (470F1), air filter (470B1), air filter cover (215X1), power cord (505J1), and screw 190E140 are all 3 HP specific. The PRO 1.5+ uses 475B1 \/ 480B1 and the PRO 2+ uses 475A1 \/ 480A1. Verify every part number against your motor before ordering — a 2 HP armature will not fit a 3 HP motor.\u003c\/p\u003e\n\n\u003ch3\u003ePower cord replacement (Ref #19, P\/N 505J1)\u003c\/h3\u003e\n\u003cp\u003eDo not tape damaged cords. Replace any cord with nicks, cracked strain relief, or plug damage. The 505J1 is the heavier-gauge cord required for the PRO 3+ and carries a 20A plug. Do not substitute the lighter 505H1 cord from the PRO 1.5+ or PRO 2+ — it will overheat under the 19A load.\u003c\/p\u003e\n\n\u003ch3\u003eSwitch + seal (Ref #28, #31)\u003c\/h3\u003e\n\u003cp\u003eAlways replace the switch (425B1) and the water-resistant seal (430A1) together. A compromised seal lets water into the switch cavity and shorts the motor.\u003c\/p\u003e\n\n\u003ch3\u003eAir filter service (Ref #32, P\/N 470B1)\u003c\/h3\u003e\n\u003cp\u003eInspect every 40 hours. Replace when gray with embedded concrete dust. Never run the motor without the filter installed. The PRO 3+ uses a \u003cstrong\u003elarger filter (470B1)\u003c\/strong\u003e than the PRO 1.5+ and PRO 2+ (470A1) because the 3 HP motor needs more cooling airflow for continuous-duty operation. Do not substitute th\u003c\/p\u003e","products":[{"product_id":"northrock-pro-3-25l3-electric-concrete-consolidator-motor-3hp","title":"Northrock PRO 3+ (25L3 \/ 25L3QD) — 3 HP Electric Concrete Consolidator Motor, 115V 19A","description":"\u003ch2\u003eNorthrock PRO 3+ Electric Concrete Consolidator Motor — 3 HP, 115V, 19 Amp\u003c\/h2\u003e\n\n\u003cp\u003eThe Northrock \u003cstrong\u003ePRO 3+\u003c\/strong\u003e (model \u003cstrong\u003e25L3\u003c\/strong\u003e, or \u003cstrong\u003e25L3QD\u003c\/strong\u003e with quick-disconnect) is Northrock's heavy-duty electric concrete consolidator motor — the \u003cstrong\u003e3 HP workhorse\u003c\/strong\u003e built for the busy contractor and tough rental applications where a 1.5 HP or 2 HP motor would bog down under load. The 3 HP universal motor drives the full Northrock head range up to \u003cstrong\u003e2-1\/2\" diameter\u003c\/strong\u003e and is the correct choice for \u003cstrong\u003ecolumn vibration, slab consolidation, footings and forms, structural walls, precast production, and low-slump concrete mixes\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cp\u003eManufactured in Bohemia, NY. \u003cstrong\u003eUL \/ cUL Listed.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eWhen you need the PRO 3+ instead of the PRO 2+\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow-slump mixes\u003c\/strong\u003e — stiff concrete draws more amperage through the shaft. The 3 HP motor holds rated frequency (~10,000 VPM) where a 2 HP motor sags under load.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrecast production\u003c\/strong\u003e — continuous multi-hour cycles with short cool-down windows.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLong shaft runs\u003c\/strong\u003e — 21 ft single shafts or two connected shafts up to 60 ft. Longer shafts consume more driveline power; the PRO 3+ carries it without bogging.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e2\" and 2-1\/2\" head work\u003c\/strong\u003e — large-diameter heads displace more concrete per revolution and demand more torque to stay at the target 10,000 VPM under load.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRental fleets\u003c\/strong\u003e — the PRO 3+ is the model renters reach for when a 20 A circuit is available and the job is bigger than residential.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColumn and wall pours\u003c\/strong\u003e — enough torque to work a 2-1\/2\" head through rebar-congested columns without stalling.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHeavy-duty construction\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUpgraded armature, field coil, and end bell\u003c\/strong\u003e versus the PRO 2+ — parts \u003cstrong\u003e475C1\u003c\/strong\u003e (armature), \u003cstrong\u003e480C1\u003c\/strong\u003e (field), and \u003cstrong\u003e420D1\u003c\/strong\u003e (end bell) are unique to the 25L3 build and rated for the higher amp draw.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLarger air filter and baffle assembly\u003c\/strong\u003e (\u003cstrong\u003e470B1\u003c\/strong\u003e \/ \u003cstrong\u003e470F1\u003c\/strong\u003e) — more cooling airflow for continuous-duty operation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeavier-gauge power cord\u003c\/strong\u003e (\u003cstrong\u003e505J1\u003c\/strong\u003e) — carries the 20 A plug required for the higher amp draw.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-strength cast aluminum housing\u003c\/strong\u003e — full-perimeter heat sink that dissipates damaging heat on long pours.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRugged shock-absorbing frame\u003c\/strong\u003e — doubles as a carry handle and shields the rocker switch from drops and impact.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWatertight, strain-relief cord entry\u003c\/strong\u003e — the #1 preventable jobsite failure is a pulled or flooded power cord; the PRO 3+ is built to stop it.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProtected rocker switch\u003c\/strong\u003e — water-resistant seal and frame protection against side impact.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFully field-serviceable\u003c\/strong\u003e — brushes, bearings, armature, field coil, switch, cord, and frame are all individually replaceable OEM parts, all stocked at DanseUSA.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOptional shoulder strap\u003c\/strong\u003e available for single-operator long-pour comfort.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e PRO 3+ (25L3 standard \/ 25L3QD quick-disconnect)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMotor:\u003c\/strong\u003e 3 HP, single-phase, universal\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 115V, 60 Hz\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAmp draw:\u003c\/strong\u003e 19 A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutlet requirement:\u003c\/strong\u003e 20 A circuit with NEMA 5-20R T-slot receptacle — will not run on a standard 15 A household outlet\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGenerator requirement:\u003c\/strong\u003e 2,500+ running watts with 20 A outlet\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMax vibrator head diameter:\u003c\/strong\u003e 2-1\/2\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMax flexible shaft length:\u003c\/strong\u003e up to 60 ft with connector\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTarget vibration frequency:\u003c\/strong\u003e ~10,000 VPM under load\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eListings:\u003c\/strong\u003e UL \/ cUL\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Made in USA — Bohemia, NY\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e25L3 standard vs. 25L3QD quick-disconnect\u003c\/h3\u003e\n\u003cp\u003eBoth motors are mechanically identical 3 HP power units. The difference is the shaft coupling:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e25L3 (standard)\u003c\/strong\u003e — permanent threaded shaft connection using core adapter \u003cstrong\u003e160AH1\u003c\/strong\u003e and casing adapter \u003cstrong\u003e150DW1\u003c\/strong\u003e. Choose this for crews that rarely swap shaft lengths.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e25L3QD (quick-disconnect)\u003c\/strong\u003e — tool-free quick-release coupling using core adapter \u003cstrong\u003e160CW1\u003c\/strong\u003e and casing adapter \u003cstrong\u003e150DE1\u003c\/strong\u003e. Choose this for rental fleets and multi-head jobs where crews swap shaft lengths or head sizes in the middle of a pour.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCompatible shafts and heads\u003c\/h3\u003e\n\n\u003cp\u003eThe PRO 3+ drives Northrock flexible shafts and vibrator heads across the \u003cstrong\u003efull range — seven head sizes from 3\/4\" through 2-1\/2\"\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eShaft lengths (single):\u003c\/strong\u003e 2 ft, 5 ft, 7 ft, 10 ft, 12 ft, 14 ft, 16 ft, 21 ft. \u003cstrong\u003eMaximum reach with connector:\u003c\/strong\u003e up to 60 ft.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eShaft types:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandard-duty shaft\u003c\/strong\u003e — stiffer construction for better poking ability and control in open pours.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePencil shaft\u003c\/strong\u003e — more flexible, designed for tight, rebar-congested areas (used with 3\/4\" and 1-1\/4\" heads).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eQuick-disconnect shafts for the 25L3QD\u003c\/strong\u003e — recommended compatible shafts include the \u003cstrong\u003e25N7 (7 ft)\u003c\/strong\u003e and \u003cstrong\u003e25N14 (14 ft)\u003c\/strong\u003e QD-compatible assemblies. QD shafts feature rubber-coated steel braiding to resist stretching and a hardened steel inner liner that serves as the bearing surface for the greased core. Each assembly includes both the shaft casing and a pre-greased core.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eNorthrock vibrator heads (maintenance-free):\u003c\/strong\u003e All seven Northrock heads (3\/4\", 1\", 1-1\/4\", 1-1\/2\", 1-3\/4\", 2\", 2-1\/2\") are factory-sealed with \u003cstrong\u003efour high-performance lifetime ball bearings, an oil-bath lubrication system with permanent seal\u003c\/strong\u003e, alloy steel housing, and a scientifically-designed eccentric that maximizes amplitude. The permanent seal keeps oil in and contaminants out — no field maintenance required. Replace the entire head when the bearings eventually fail.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMulti-brand compatible\u003c\/strong\u003e — the PRO 3+ is adapter-ready for existing shafts and heads from Wacker Neuson (M1000 \/ M2000 \/ M3000), Wyco (990 \/ 991 \/ 992 \/ 993 series), Oztec (1.2 \/ 1.8 \/ 2.4 \/ 3.2), Stow, Stone, Multiquip \/ Mikasa (PMA series), Dynapac, Viber, Master, Denver, Dreyer, and Remington with the correct core and casing adapter pair.\u003c\/p\u003e\n\n\u003ch3\u003eBest applications\u003c\/h3\u003e\n\u003cp\u003ePrecast concrete plants, bridge deck and pier pours, retaining walls, heavily reinforced columns, large commercial footings, tilt-up panels, stiff low-slump structural mixes, ICF wall fill, mass pours, and any production environment where a vibrator runs continuously for most of the shift. The PRO 3+ is also the standard rental-fleet choice for contractors who rent by the week for big-job consolidation work.\u003c\/p\u003e\n\n\u003ch3\u003eElectrical setup and extension cord sizing\u003c\/h3\u003e\n\u003cp\u003eBecause the PRO 3+ pulls 19 A, it must be run from a \u003cstrong\u003ededicated 20 A circuit\u003c\/strong\u003e with a 20 A T-slot receptacle (NEMA 5-20R) or a generator rated above 2,500 running watts with a 20 A outlet. Running the PRO 3+ through an undersized extension cord is the fastest way to burn the motor — voltage drop forces the motor to draw more current to maintain RPM, which cooks brushes, armature windings, and the field coil.\u003c\/p\u003e\n\n\u003cp\u003eUse these cord sizes, straight from the Northrock manual:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e0–25 ft: \u003cstrong\u003e12 AWG\u003c\/strong\u003e minimum\u003c\/li\u003e\n  \u003cli\u003e26–50 ft: \u003cstrong\u003e10 AWG\u003c\/strong\u003e minimum\u003c\/li\u003e\n  \u003cli\u003e51–100 ft: Not recommended\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eOutdoor cords must be marked with the suffix \u003cstrong\u003eW-A\u003c\/strong\u003e (e.g. SOW-A), 3-conductor grounded. Use a GFCI in damp or wet jobsite conditions. \u003cstrong\u003eNever run the PRO 3+ on 14 AWG cord\u003c\/strong\u003e regardless of length.\u003c\/p\u003e\n\n\u003ch3\u003eChoosing PRO 3+ vs. PRO 1.5+ vs. PRO 2+\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePRO 1.5+ (25L1)\u003c\/strong\u003e — 1.5 HP \/ 13 A. Tops out at 1-1\/2\" heads. Residential slabs, footings, light commercial. Runs on any 15 A household outlet.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePRO 2+ (25L2)\u003c\/strong\u003e — 2 HP \/ 15 A. Full Northrock head range (3\/4\"–2-1\/2\"). General construction, rental fleets, mixed daily work. Runs on standard 15 A \/ 20 A circuits.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePRO 3+ (25L3)\u003c\/strong\u003e — 3 HP \/ 19 A. Full head range. Heavy-duty, precast, low-slump, continuous-duty, long shaft runs. \u003cstrong\u003eRequires a 20 A circuit.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's in the box\u003c\/h3\u003e\n\u003cp\u003eMotor \/ power unit only. \u003cstrong\u003eFlexible shafts and vibrator heads are sold separately\u003c\/strong\u003e so you can configure the exact shaft length, shaft type (standard-duty vs. pencil), and head diameter for your pour. Browse compatible Northrock shafts and heads in our related-products section, or call us and we'll spec the right combination for your application.\u003c\/p\u003e\n\n\u003ch3\u003eWhy buy the PRO 3+ from DanseUSA\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAuthorized Northrock dealer\u003c\/strong\u003e — genuine OEM motor with full factory warranty.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eComplete 25L3 parts backup in stock\u003c\/strong\u003e — including the 25L3-specific armature (475C1), field coil (480C1), end bell (420D1), motor housing (105AG1), frame assembly (440D1), heavy-gauge cord (505J1), and larger air filter (470B1) that the smaller motors don't share.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSame-day shipping\u003c\/strong\u003e on in-stock orders placed before 12 PM ET.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel-specific compatibility support\u003c\/strong\u003e — if you're adapting the PRO 3+ to run existing non-Northrock shafts or heads, email your shaft brand and model to \u003ca href=\"mailto:customerservice@danseusa.com\"\u003ecustomerservice@danseusa.com\u003c\/a\u003e and we'll confirm the right core adapter and casing adapter before you buy.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMulti-brand expertise\u003c\/strong\u003e — we carry Northrock, Wacker, Wyco, Oztec, Multiquip, Stone, and other major concrete vibrator brands, so we can cross-reference parts across your entire fleet.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eQuestions about fit or the right motor for your pour? Call \u003cstrong\u003e+1 (202) 630-1027\u003c\/strong\u003e or email \u003ca href=\"mailto:customerservice@danseusa.com\"\u003ecustomerservice@danseusa.com\u003c\/a\u003e.\u003c\/p\u003e","brand":"NORTHROCK","offers":[{"title":"Default Title","offer_id":47708536471778,"sku":null,"price":650.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0728\/0204\/2082\/files\/NorthrockPo3_ConcreteVibrator.png?v=1776614623"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0728\/0204\/2082\/collections\/Northrock2Plusmotor_1f98a780-848e-44bd-91b1-7e8f179d6b53.png?v=1776613696","url":"https:\/\/www.danseusa.com\/collections\/northrock-pro-3-25l3-parts-diagram.oembed","provider":"Danse USA","version":"1.0","type":"link"}