{"title":"PRO 1.5+ 25L1 Electric Concrete Vibrator Parts by Northrock","description":"\u003cp\u003e\u003cstrong\u003eGenuine OEM replacement parts for the Northrock PRO 1.5+ electric concrete vibrator motor (Northrock model numbers \u003cstrong\u003e25L1\u003c\/strong\u003e and \u003cstrong\u003e25L1QD\u003c\/strong\u003e for the quick-disconnect version).\u003c\/strong\u003e \u003cbr\u003e\u003cbr\u003eDanseUSA is an authorized Northrock dealer — every part on this page is factory-original, shipped from US warehouses, and matched to the exact Northrock parts breakdown published in the PRO 1.5+ \/ PRO 2+ \/ PRO 3+ service manual.\u003c\/p\u003e\n\u003cp\u003eUse the \u003cstrong\u003eShop by Diagram\u003c\/strong\u003e tool below to click the numbered callout on the exploded view and jump straight to the right part. Don't know which model you have? Email \u003ca href=\"mailto:sales@danseusa.com\"\u003ecustomerservice@danseusa.com\u003c\/a\u003e with a photo of the motor nameplate and we'll confirm it before you buy.\u003c\/p\u003e\n\u003ch2\u003eAbout the Northrock PRO 1.5+ Motor\u003c\/h2\u003e\n\u003cp\u003eThe Northrock \u003cstrong\u003ePRO 1.5+\u003c\/strong\u003e is the smallest power unit in Northrock's flagship three-motor electric vibrator lineup (PRO 1.5+ \/ PRO 2+ \/ PRO 3+). It's a single-phase universal 1.5 HP motor designed for concrete consolidation on residential slabs, footings, curb-and-gutter, small columns, and light commercial pours. The motor drives Northrock flexible shafts and steel vibrator heads up to \u003cstrong\u003e1-1\/2\" in diameter\u003c\/strong\u003e (with some quick-disconnect configurations rated up to 1-3\/4\"), and it runs off a standard 115V household or generator outlet.\u003c\/p\u003e\n\u003ch3\u003eNorthrock PRO 1.5+ Key Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel numbers:\u003c\/strong\u003e 25L1 (standard) \/ 25L1QD (quick-disconnect)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor:\u003c\/strong\u003e 1.5 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 13 A (runs on a standard 15 A outlet)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMax head diameter:\u003c\/strong\u003e 1-1\/2\" (up to 1-3\/4\" on QD configurations)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMax shaft length:\u003c\/strong\u003e 42 ft with shaft 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\u003ePlug type:\u003c\/strong\u003e 3-prong grounded, NEMA 5-15\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertifications:\u003c\/strong\u003e UL \/ cUL Listed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHousing:\u003c\/strong\u003e High-strength cast aluminum (heat-dissipating)\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\u003ch3\u003e\n\u003cbr\u003eHow the PRO 1.5+ compares to the PRO 2+ and PRO 3+\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpec\u003c\/th\u003e\n\u003cth\u003ePRO 1.5+ (25L1)\u003c\/th\u003e\n\u003cth\u003ePRO 2+ (25L2)\u003c\/th\u003e\n\u003cth\u003ePRO 3+ (25L3)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eHorsepower\u003c\/td\u003e\n\u003ctd\u003e1.5 HP\u003c\/td\u003e\n\u003ctd\u003e2 HP\u003c\/td\u003e\n\u003ctd\u003e3 HP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAmp draw\u003c\/td\u003e\n\u003ctd\u003e13 A\u003c\/td\u003e\n\u003ctd\u003e15 A\u003c\/td\u003e\n\u003ctd\u003e19 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutlet required\u003c\/td\u003e\n\u003ctd\u003eStandard 15 A\u003c\/td\u003e\n\u003ctd\u003eStandard 15–20 A\u003c\/td\u003e\n\u003ctd\u003e20 A (NEMA 5-20R)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax head diameter\u003c\/td\u003e\n\u003ctd\u003e1-1\/2\"\u003c\/td\u003e\n\u003ctd\u003e2-1\/2\"\u003c\/td\u003e\n\u003ctd\u003e2-1\/2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIdeal use\u003c\/td\u003e\n\u003ctd\u003eResidential, light-commercial\u003c\/td\u003e\n\u003ctd\u003eGeneral construction, rental\u003c\/td\u003e\n\u003ctd\u003ePrecast, low-slump, continuous\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003e\n\u003cbr\u003eShaft \u0026amp; Head Compatibility — What Fits the PRO 1.5+\u003c\/h2\u003e\n\u003ch3\u003eNative Northrock shafts\u003c\/h3\u003e\n\u003cp\u003eThe PRO 1.5+ is designed to run any Northrock flexible shaft in the following configurations:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard-duty shafts\u003c\/strong\u003e — stiffer construction, better poking control for general slab work.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePencil shafts\u003c\/strong\u003e — more flexible; used with 3\/4\" and 1-1\/4\" heads for tight rebar-congested pours.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailable lengths:\u003c\/strong\u003e 2 ft, 5 ft, 7 ft, 10 ft, 12 ft, 14 ft, 16 ft, and 21 ft in single continuous lengths.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum reach:\u003c\/strong\u003e up to 42 ft when two shafts are joined with a Northrock shaft connector.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatible Northrock head sizes for the PRO 1.5+\u003c\/h3\u003e\n\u003cp\u003eBecause the PRO 1.5+ is rated for a maximum head diameter of 1-1\/2\", you can safely run the following Northrock heads:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e3\/4\" head\u003c\/strong\u003e (nosepiece 100A75, shell 105A75) — rebar-dense walls, curbs, small columns.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1\" head\u003c\/strong\u003e (nosepiece 100B1, shell 105B1) — residential slabs, sidewalks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1-1\/4\" head\u003c\/strong\u003e (nosepiece 100C12, shell 105C12) — slabs-on-grade, driveways.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1-1\/2\" head\u003c\/strong\u003e (nosepiece 100D15, shell 105D15) — the largest head the PRO 1.5+ should be run with.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"warning\"\u003e\u003cstrong\u003eDo not run 1-3\/4\", 2\", or 2-1\/2\" heads on a PRO 1.5+ motor.\u003c\/strong\u003e The motor will bog down under load, overheat, and burn brushes and bearings prematurely. Step up to a PRO 2+ or PRO 3+ for those head sizes.\u003c\/p\u003e\n\u003ch3\u003eMulti-brand shaft \u0026amp; head compatibility (adapter required)\u003c\/h3\u003e\n\u003cp\u003eOne of the biggest reasons contractors standardize on Northrock motors is that they're not proprietary — the PRO 1.5+ can be configured with the correct \u003cstrong\u003ecore adapter\u003c\/strong\u003e (part starts with 160) and \u003cstrong\u003ecasing adapter\u003c\/strong\u003e (part starts with 150) to drive shafts and heads from virtually every major concrete vibrator brand on the market. That means a single PRO 1.5+ motor can rescue orphaned shafts and heads from retired motors you already own.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eOther Brand\u003c\/th\u003e\n\u003cth\u003eCompatible Model(s)\u003c\/th\u003e\n\u003cth\u003eCore Adapter\u003c\/th\u003e\n\u003cth\u003eCasing Adapter\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eDenver\u003c\/td\u003e\n\u003ctd\u003eQM500, JM700\u003c\/td\u003e\n\u003ctd\u003e160BT1\u003c\/td\u003e\n\u003ctd\u003e150DJ1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDreyer\u003c\/td\u003e\n\u003ctd\u003eJE\u003c\/td\u003e\n\u003ctd\u003e160CX1\u003c\/td\u003e\n\u003ctd\u003e150FH1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDynapac\u003c\/td\u003e\n\u003ctd\u003eAH15, AH25\u003c\/td\u003e\n\u003ctd\u003e160DK1\u003c\/td\u003e\n\u003ctd\u003e150FX1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaster\u003c\/td\u003e\n\u003ctd\u003eCV10, CV15, CV20\u003c\/td\u003e\n\u003ctd\u003e160AH2\u003c\/td\u003e\n\u003ctd\u003e150DB1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMikasa \/ Multiquip\u003c\/td\u003e\n\u003ctd\u003ePMA-1, PMA-2, PMA-3\u003c\/td\u003e\n\u003ctd\u003e160DD1\u003c\/td\u003e\n\u003ctd\u003e150FR1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNorthrock (native)\u003c\/td\u003e\n\u003ctd\u003e1.5+, 2+, 3+ standard\u003c\/td\u003e\n\u003ctd\u003e160AH1\u003c\/td\u003e\n\u003ctd\u003e150DW1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNorthrock w\/ Q.D.\u003c\/td\u003e\n\u003ctd\u003e1.5+, 2+, 3+ QD\u003c\/td\u003e\n\u003ctd\u003e160CW1\u003c\/td\u003e\n\u003ctd\u003e150DE1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOztec\u003c\/td\u003e\n\u003ctd\u003e1.2, 1.8, 2.4, 3.2\u003c\/td\u003e\n\u003ctd\u003e160AH1\u003c\/td\u003e\n\u003ctd\u003e150CX1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOztec w\/ Q.D.\u003c\/td\u003e\n\u003ctd\u003e1.2, 1.8, 2.4, 3.2 QD\u003c\/td\u003e\n\u003ctd\u003e160CW1\u003c\/td\u003e\n\u003ctd\u003e150DE1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRemington\u003c\/td\u003e\n\u003ctd\u003eVL\u003c\/td\u003e\n\u003ctd\u003e160CT2\u003c\/td\u003e\n\u003ctd\u003e150DF1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRemington\u003c\/td\u003e\n\u003ctd\u003e1EV, 2EV, 3EV\u003c\/td\u003e\n\u003ctd\u003e160BM1\u003c\/td\u003e\n\u003ctd\u003e150DF1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStone\u003c\/td\u003e\n\u003ctd\u003e1 HP, 1-1\/2 HP, 2 HP, 3 HP\u003c\/td\u003e\n\u003ctd\u003e160AH3\u003c\/td\u003e\n\u003ctd\u003e150DC1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStow\u003c\/td\u003e\n\u003ctd\u003ePencil\u003c\/td\u003e\n\u003ctd\u003e160BF1\u003c\/td\u003e\n\u003ctd\u003e150DD1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStow\u003c\/td\u003e\n\u003ctd\u003eNo Q.D.\u003c\/td\u003e\n\u003ctd\u003e160BG1\u003c\/td\u003e\n\u003ctd\u003e150CY1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStow\u003c\/td\u003e\n\u003ctd\u003eWith Q.D.\u003c\/td\u003e\n\u003ctd\u003e160BD1\u003c\/td\u003e\n\u003ctd\u003e150DE1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eViber\u003c\/td\u003e\n\u003ctd\u003eVME\u003c\/td\u003e\n\u003ctd\u003e160AH4\u003c\/td\u003e\n\u003ctd\u003e150CW1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWacker Neuson\u003c\/td\u003e\n\u003ctd\u003eM1000, M2000, M3000\u003c\/td\u003e\n\u003ctd\u003e160BD2\u003c\/td\u003e\n\u003ctd\u003e150DE1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWyco\u003c\/td\u003e\n\u003ctd\u003e990, 991, 991-1\/2\u003c\/td\u003e\n\u003ctd\u003e160CT1\u003c\/td\u003e\n\u003ctd\u003e150DG1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWyco\u003c\/td\u003e\n\u003ctd\u003e902, 992\u003c\/td\u003e\n\u003ctd\u003e160BP1\u003c\/td\u003e\n\u003ctd\u003e150DG1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWyco\u003c\/td\u003e\n\u003ctd\u003e992-1\/2\u003c\/td\u003e\n\u003ctd\u003e160CT1\u003c\/td\u003e\n\u003ctd\u003e150DH1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWyco\u003c\/td\u003e\n\u003ctd\u003e903, 993\u003c\/td\u003e\n\u003ctd\u003e160BP1\u003c\/td\u003e\n\u003ctd\u003e150DH1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eIf your brand isn't listed, call \u003cstrong\u003e+1 (202) 630-1027\u003c\/strong\u003e or email \u003ca href=\"mailto:sales@danseusa.com\"\u003ecustomerservice@danseusa.com\u003c\/a\u003e with your shaft brand, model, and head size — we will confirm the correct adapter before you order.\u003c\/p\u003e\n\u003ch2\u003eNorthrock PRO 1.5+ Repair \u0026amp; Maintenance Guide\u003c\/h2\u003e\n\u003cp\u003eThe PRO 1.5+ is a durable motor, but it's a brush-commutator universal motor running inside a sealed aluminum housing on a wet, dirty jobsite. The majority of \"dead\" PRO 1.5+ motors that come in for repair aren't actually dead — they need one of five common wear parts replaced. Here is the order of operations experienced Northrock service technicians follow when diagnosing a 25L1 that won't run, won't hold speed, or runs hot.\u003c\/p\u003e\n\u003ch3\u003e1) Carbon brushes — the #1 replacement part (Ref #21, P\/N 490A1)\u003cbr\u003e\n\u003c\/h3\u003e\n\u003cp\u003eCarbon brushes are consumable. On a PRO 1.5+ running 4–6 hours per day, a pair of brushes typically lasts 200–400 operating hours before the carbon wears down to the retaining spring. Symptoms of worn brushes:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMotor runs weakly or won't start under load\u003c\/li\u003e\n\u003cli\u003eHeavy sparking visible through the commutator service port\u003c\/li\u003e\n\u003cli\u003eIntermittent power as the motor warms up\u003c\/li\u003e\n\u003cli\u003eDistinct burning-carbon smell\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFix:\u003c\/strong\u003e Unplug the cord, remove both outer protective brush caps (P\/N 400C1, Ref #23) and brush caps (P\/N 500A1, Ref #22), pull the old brushes, inspect the commutator for glazing, and install a fresh pair of 490A1 brushes. Always replace brushes in pairs, never one at a time — an unmatched pair will wear unevenly and pit the commutator.\u003c\/p\u003e\n\u003ch3\u003e2) Ball bearings (Ref #8, P\/N 140C300)\u003c\/h3\u003e\n\u003cp\u003eThe PRO 1.5+ uses two sealed ball bearings, one on each end of the armature. Bearings fail from contamination (concrete dust infiltration) or from running the motor with a dry, unlubricated flexible shaft core — which back-drives drag into the motor and cooks the bearings. Symptoms:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLoud grinding or squealing from the housing\u003c\/li\u003e\n\u003cli\u003eArmature shaft wobble when rotated by hand\u003c\/li\u003e\n\u003cli\u003eMotor runs hot even with a clean air filter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFix:\u003c\/strong\u003e Replace both bearings as a set. Always diagnose the shaft lubrication at the same time — if the core is dry, grease it with lithium grease (approximately 1\/16\" coating, not more) before running the motor again, or the new bearings will fail too.\u003c\/p\u003e\n\u003ch3\u003e3) Armature and field coil (Ref #9 P\/N 475B1, Ref #12 P\/N 480B1)\u003c\/h3\u003e\n\u003cp\u003eThese are the two large electrical components of the motor. Both are \u003cstrong\u003emodel-specific\u003c\/strong\u003e — the 1.5 HP armature (475B1) and field (480B1) are different parts from the PRO 2+ (475A1 \/ 480A1) and the PRO 3+ (475C1 \/ 480C1). Do not interchange these across models. Armature failure usually shows as a dead short, a burned commutator, or visible copper winding damage. Field coil failure shows as the motor spinning freely but with almost no torque.\u003c\/p\u003e\n\u003ch3\u003e4) Power cord (Ref #19, P\/N 505H1)\u003c\/h3\u003e\n\u003cp\u003eThe watertight strain-relief cord is a wear item on jobsites. Cords get crushed by wheelbarrows, yanked out of outlets, cut by rebar, and chewed by the sun. The 505H1 is the correct OEM replacement for the PRO 1.5+ and PRO 2+ (the PRO 3+ uses the heavier 505J1 cord). Replace any cord with visible nicks, a cracked strain-relief, or a damaged plug — do not tape and keep running. A damaged cord is an electrocution risk on wet concrete.\u003c\/p\u003e\n\u003ch3\u003e5) Air filter and baffle filter (Ref #32 P\/N 470A1, Ref #6 P\/N 470E1)\u003c\/h3\u003e\n\u003cp\u003eThe air filter sits under the air filter cover (P\/N 215N1) and keeps concrete dust out of the motor's cooling airflow. A clogged filter is the most common cause of thermal shutdown. Inspect the filter every 40 operating hours. If it's gray with embedded concrete powder, replace it. Do not run the motor without the filter installed — you'll destroy the brushes, armature, and bearings inside 50 hours.\u003c\/p\u003e\n\u003ch3\u003e6) Electric switch and switch seal (Ref #28 P\/N 425B1, Ref #31 P\/N 430A1)\u003c\/h3\u003e\n\u003cp\u003eThe rocker switch and its water-resistant seal fail together. If the switch is mushy, sticks in the on position, or allows any water intrusion, replace both the switch and the seal as a pair. Running a PRO 1.5+ with a compromised switch seal is the fastest way to short the motor on a rainy pour.\u003c\/p\u003e\n\u003ch3\u003ePreventive maintenance schedule (from the Northrock service manual)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEvery shift:\u003c\/strong\u003e Inspect cord, plug, switch, and air filter cover. Clean dust off the housing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEvery 40 hours:\u003c\/strong\u003e Open the air filter cover and clean or replace the filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEvery 50 hours:\u003c\/strong\u003e Disconnect the flexible shaft, pull the inner core, inspect for dry spots, and re-grease with lithium grease (~1\/16\" coating — do not over-grease, it adds drag and cooks the motor).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEvery 200 hours:\u003c\/strong\u003e Check carbon brush length through the service port. Replace if the carbon is worn past the retaining spring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEvery 500 hours:\u003c\/strong\u003e Inspect commutator for glazing, pitting, or grooving. Light glazing can be cleaned with fine abrasive; deep grooving means the armature needs to be turned or replaced.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnnually:\u003c\/strong\u003e Replace ball bearings if the motor sees heavy daily use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eExtension Cord Sizing for the PRO 1.5+\u003c\/h2\u003e\n\u003cp\u003eThe PRO 1.5+ pulls 13 amps under load. Running the motor through an undersized extension cord is the single most common way contractors kill otherwise-healthy motors — the voltage drop causes the motor to draw more current to maintain RPM, which burns brushes, armature windings, and field coils. Use the chart below, straight from the Northrock service manual:\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eCord length\u003c\/th\u003e\n\u003cth\u003eMinimum AWG for 13 A draw\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e0–25 ft\u003c\/td\u003e\n\u003ctd\u003e14 AWG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e26–50 ft\u003c\/td\u003e\n\u003ctd\u003e12 AWG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e51–100 ft\u003c\/td\u003e\n\u003ctd\u003eNot recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eOutdoor jobsite cords must be marked with the suffix \u003cstrong\u003eW-A\u003c\/strong\u003e (for example, SOW-A). Always use a 3-conductor grounded cord with a matching 3-prong grounded plug. If you're working in a damp or wet environment, plug the motor into a GFCI-protected outlet or use an inline GFCI adapter.\u003c\/p\u003e\n\u003ch2\u003eWhy Buy Northrock PRO 1.5+ Parts from DanseUSA\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuthorized Northrock dealer\u003c\/strong\u003e — every part is genuine OEM, backed by the factory warranty.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSame-day shipping\u003c\/strong\u003e — orders placed before 12 PM ET ship the same business day when the item is in stock.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShop-by-Diagram tool\u003c\/strong\u003e — click the numbered callout on the exploded view above to jump straight to the right part. No digging through part numbers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatibility support\u003c\/strong\u003e — email your motor's model and serial number to \u003ca href=\"mailto:sales@danseusa.com\"\u003esales@danseusa.com\u003c\/a\u003e or call \u003cstrong\u003e+1 (202) 630-1027\u003c\/strong\u003e and we'll verify fit 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 more, so we can help you cross-reference parts and adapt shafts and heads across brands.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat's the difference between the 25L1 and 25L1QD?\u003c\/h3\u003e\n\u003cp\u003eBoth are 1.5 HP PRO 1.5+ motors. The \u003cstrong\u003e25L1QD\u003c\/strong\u003e has a quick-disconnect coupling that lets you swap shafts in seconds without tools — ideal for rental fleets and crews that switch head sizes during a pour. The core motor internals are identical; the difference is the core adapter (160CW1 vs. 160AH1) and casing adapter (150DE1 vs. 150DW1) configuration.\u003c\/p\u003e\n\u003ch3\u003eCan I run a 2\" or 2-1\/2\" head on my PRO 1.5+?\u003c\/h3\u003e\n\u003cp\u003eNo. The PRO 1.5+ is rated for heads up to 1-1\/2\" diameter. Running larger heads overloads the motor, destroys the brushes and bearings prematurely, and voids the warranty. For heads larger than 1-1\/2\", upgrade to the PRO 2+ (2 HP) or PRO 3+ (3 HP).\u003c\/p\u003e\n\u003ch3\u003eHow do I know if my brushes need replacing?\u003c\/h3\u003e\n\u003cp\u003ePull one brush cap and inspect the brush. If the carbon portion is shorter than about 1\/4\" or if the brush has visibly chipped, cracked, or glazed faces, replace \u003cstrong\u003eboth brushes\u003c\/strong\u003e as a pair (P\/N 490A1). Never mix a new brush with an old one.\u003c\/p\u003e\n\u003ch3\u003eMy shafts are from a different brand — will the PRO 1.5+ run them?\u003c\/h3\u003e\n\u003cp\u003eYes, with the correct core adapter and casing adapter. Northrock motors are designed around a universal countershaft. Check the compatibility table above for your brand (Wacker, Wyco, Oztec, Stow, Stone, Multiquip, Mikasa, etc.), order the matching adapter pair, and your existing shafts and heads will run on the PRO 1.5+.\u003c\/p\u003e\n\u003ch3\u003eDo I need to lubricate the motor bearings?\u003c\/h3\u003e\n\u003cp\u003eNo — the motor bearings (140C300) are sealed for life and require no field lubrication. Replace them when they fail. However, the \u003cstrong\u003eflexible shaft inner core\u003c\/strong\u003e does require regular lithium grease service every 50 operating hours. Dry shafts are the #1 cause of premature bearing failure in the motor.\u003c\/p\u003e\n\u003ch3\u003eIs the PRO 1.5+ repairable, or do I just replace the whole motor?\u003c\/h3\u003e\n\u003cp\u003eFully repairable. Every consumable and wear component — brushes, bearings, armature, field coil, switch, cord, housing, frame — is individually replaceable with OEM parts. With regular maintenance, a PRO 1.5+ can run for thousands of hours across multiple armature replacements.\u003c\/p\u003e\n\u003ch3\u003eWhere is the Northrock PRO 1.5+ manufactured?\u003c\/h3\u003e\n\u003cp\u003eAll Northrock electric concrete vibrator motors, shafts, and heads are designed and manufactured in Bohemia, New York, USA.\u003c\/p\u003e","products":[{"product_id":"northrock-pro-1-5-electric-concrete-vibrator-motor-25l1","title":"Northrock PRO 1.5+ (25L1 \/ 25L1QD) — 1.5 HP Electric Concrete Vibrator Motor","description":"\u003ch2\u003eNorthrock PRO 1.5+ Electric Concrete Vibrator Motor — 1.5 HP, 115V, 13 Amp\u003c\/h2\u003e\n\n\u003cp\u003eThe Northrock \u003cstrong\u003ePRO 1.5+\u003c\/strong\u003e (model \u003cstrong\u003e25L1\u003c\/strong\u003e, or \u003cstrong\u003e25L1QD\u003c\/strong\u003e with quick-disconnect) is a 1.5 HP single-phase electric power unit built for slabs, footings, columns, and light-to-medium residential and commercial pours. It drives Northrock flexible shafts and vibrator heads up to \u003cstrong\u003e1-1\/2\" diameter\u003c\/strong\u003e, delivering the mid-frequency vibration profile Northrock designs specifically to consolidate homogenous concrete mixes without destroying the freeze-thaw pressure-relief chains that higher-frequency competitive units can damage.\u003c\/p\u003e\n\n\u003cp\u003eLike every Northrock electric vibrator, the PRO 1.5+ is designed and manufactured in Bohemia, New York, and is \u003cstrong\u003eUL \/ cUL Listed\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eWhy contractors choose the PRO 1.5+\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-strength cast aluminum housing\u003c\/strong\u003e — acts as a heat sink to dissipate motor heat on long pours, unlike the plastic shells used by many competitors.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShock-absorbing outer frame\u003c\/strong\u003e — protects the housing from jobsite drops and doubles as an ergonomic carry handle.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWatertight, strain-relief power cord\u003c\/strong\u003e — prevents accidental cord pull-outs and resists water intrusion in wet-site conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProtected rocker switch\u003c\/strong\u003e with water-resistant seal — shielded inside the frame.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eField-serviceable\u003c\/strong\u003e — brushes, switch, bearings, armature, and field are all accessible OEM-replaceable items. DanseUSA stocks the full 25L1 parts breakdown.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUniversal countershaft\u003c\/strong\u003e — order with adapters to drive existing Wacker, Wyco, Stow, Oztec, Mikasa, Multiquip (Mikasa PMA), Stone, Dynapac, Viber, Master, Denver, Dreyer, or Remington shafts and heads.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuick-disconnect option (25L1QD)\u003c\/strong\u003e — swap shafts in seconds on rental fleets or multi-trade jobsites.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eModel: PRO 1.5+ (25L1 \/ 25L1QD)\u003c\/li\u003e\n  \u003cli\u003eMotor: 1.5 HP, single-phase, universal\u003c\/li\u003e\n  \u003cli\u003eVoltage: 115V, 60 Hz\u003c\/li\u003e\n  \u003cli\u003eAmp draw: 13 A (runs on a standard 15 A household outlet)\u003c\/li\u003e\n  \u003cli\u003eMax vibrator head diameter: 1-1\/2\" (the manual permits use up to 1-3\/4\" heads per sizing chart)\u003c\/li\u003e\n  \u003cli\u003eMax flexible shaft length: 42 ft with shaft connector\u003c\/li\u003e\n  \u003cli\u003eTarget vibration frequency: ~10,000 VPM under load\u003c\/li\u003e\n  \u003cli\u003ePlug type: 3-prong grounded (standard NEMA 5-15)\u003c\/li\u003e\n  \u003cli\u003eListings: UL \/ cUL\u003c\/li\u003e\n  \u003cli\u003eOrigin: Made in USA — Bohemia, NY\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eBest applications\u003c\/h3\u003e\n\u003cp\u003eFootings, slabs-on-grade, driveways, sidewalks, curb-and-gutter, small columns and walls, residential foundations, and any pour where a 3\/4\", 1\", 1-1\/4\", or 1-1\/2\" head provides the right radius of influence. For heavy wall and precast work, step up to the \u003cstrong\u003ePRO 2+\u003c\/strong\u003e or \u003cstrong\u003ePRO 3+\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's in the box\u003c\/h3\u003e\n\u003cp\u003eMotor \/ power unit only. \u003cstrong\u003eFlexible shafts and steel vibrator heads are sold separately\u003c\/strong\u003e so you can configure the exact length and head diameter for your pour. Browse compatible Northrock shafts (2 ft–30 ft, single lengths; up to 60 ft with a connector) and heads (3\/4\" through 2-1\/2\") in our related-products section.\u003c\/p\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eAccepts Northrock shafts natively and — with the correct core adapter and casing adapter — shafts and heads from Denver, Dreyer, Dynapac, Master, Mikasa, Oztec, Remington, Stone, Stow, Viber, Wacker, and Wyco. Contact DanseUSA with your existing shaft brand and head size and we'll confirm the right adapter pair before you order.\u003c\/p\u003e\n\n\u003ch3\u003eWhy buy from DanseUSA\u003c\/h3\u003e\n\u003cp\u003eDanseUSA is an \u003cstrong\u003eauthorized Northrock dealer\u003c\/strong\u003e. You get the factory warranty, genuine OEM construction, expert model-and-serial compatibility support, and full parts backup — brushes, bearings, armatures, switches, cords, and frames — for the life of your motor. Orders placed before 12 PM ET ship the same business day when in stock.\u003c\/p\u003e","brand":"NORTHROCK","offers":[{"title":"Default Title","offer_id":47707302396130,"sku":null,"price":450.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0728\/0204\/2082\/files\/Northrock1.5plusPromotor.png?v=1776542914"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0728\/0204\/2082\/collections\/Northrock1.5plusPromotor.png?v=1776543935","url":"https:\/\/www.danseusa.com\/collections\/northrock-pro-1-5-25l1-electric-concrete-vibrator-motor-parts.oembed","provider":"Danse USA","version":"1.0","type":"link"}