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About PRO 2+ HP Vibrator Motor Assembly Parts
Shop genuine OEM parts for the Northrock PRO 2+ (25L2 / 25L2QD) 2 HP electric concrete vibrator motor. Click any numbered callout on the diagram below to jump to the exact part. Part numbers match the official Northrock service manual.
DanseUSA is an authorized Northrock dealer. Orders placed before 12 PM ET ship same business day when in stock. Not sure which part? Email [email protected] with your motor's model and serial number.
How to Use the Diagram
Match 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.
Most Commonly Replaced Parts on the PRO 2+ (25L2)
About 80% of PRO 2+ service issues come down to these six parts. Diagnose in this order before replacing anything larger:
| Ref # | Part | P/N | Typical Life | Symptom |
|---|---|---|---|---|
| 21 | Carbon Brush (pair) | 490A1 | 200–400 hrs | Weak under load, sparking, burn smell |
| 32 | Air Filter | 470A1 | 40 hrs | Motor runs hot, thermal cutout |
| 8 | Ball Bearing (pair) | 140C300 | 500–1,500 hrs | Grinding, squealing, shaft wobble |
| 19 | Power Cord | 505H1 | As needed | Nicks, cracked strain relief, bad plug |
| 28 | Electric Switch | 425B1 | As needed | Mushy, sticks, won't toggle cleanly |
| 31 | Switch Seal | 430A1 | Replace with switch | Water intrusion, visible wear |
PRO 2+ (25L2) Full Parts List
| Ref # | Description | Part # | Qty |
|---|---|---|---|
| 1 | Screw | 190F150 | 11 |
| 2 | End Cap | 215M1 | 1 |
| 3 | Bolt | 280A225 | 4 |
| 4 | Lock Washer | 285A250 | 4 |
| 5 | End Bell | 420B1 | 1 |
| 6 | Baffle Filter (End Bell Side) | 470E1 | 1 |
| 7 | Spring Washer | 380A1 | 1 |
| 8 | Ball Bearing | 140C300 | 2 |
| 9 | Armature (2 HP specific) | 475A1 | 1 |
| 10 | Screw | 190E135 | 2 |
| 11 | Lock Washer | 285A187 | 3 |
| 12 | Field Coil (2 HP specific) | 480A1 | 1 |
| 13 | Commutator Service Port Cap | 400B1 | 1 |
| 14 | Motor Housing | 105AC1 | 1 |
| 15 | Bolt | 280A312 | 4 |
| 16 | Lock Washer | 285A312 | 4 |
| 17 | Washer | 370A312 | 4 |
| 18 | Frame Assembly | 440C1 | 2 |
| 19 | Grounded Power Cord | 505H1 | 1 |
| 20 | Brush Holder | 495A1 | 2 |
| 21 | Carbon Brush | 490A1 | 2 |
| 22 | Brush Cap | 500A1 | 2 |
| 23 | Outer Protective Brush Cap | 400C1 | 2 |
| 24 | Cord Mounting Plate | 215CC1 | 1 |
| 25 | Screw | 190F875 | 4 |
| 26 | Set Screw | 190B125 | 2 |
| 27 | Wire Clip | 467C1 | 1 |
| 28 | Electric Switch | 425B1 | 1 |
| 29 | Switch Mounting Plate | 215CB1 | 1 |
| 30 | Screw | 190F850 | 2 |
| 31 | Water-Resistant Switch Seal | 430A1 | 1 |
| 32 | Air Filter | 470A1 | 1 |
| 33 | Air Filter Cover | 215N1 | 1 |
| 34 | Core Adapter | See compatibility chart | 1 |
| 35 | Casing Adapter | See compatibility chart | 1 |
Repair Tips
Brush replacement (Ref #21, P/N 490A1)
Unplug cord. Remove outer brush cap (400C1) and brush cap (500A1). Pull old brush. If carbon is under 1/4" or cracked, replace both brushes as a pair. Check commutator for glazing — light glaze is OK, grooves or pits mean the armature needs service. Reinstall caps finger-tight plus 1/8 turn.
Bearing replacement (Ref #8, P/N 140C300)
Two 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. Apply a 1/16" coat of lithium grease to the core; do not over-grease.
Model-specific parts — do not cross-swap
The armature (475A1) and field coil (480A1) are unique to the 2 HP motor. The PRO 1.5+ uses 475B1 / 480B1; the PRO 3+ uses 475C1 / 480C1 / 420D1. The motor housing (105AC1) is shared between the PRO 1.5+ and PRO 2+ but not the PRO 3+. Verify part numbers against your motor before ordering.
Power cord replacement (Ref #19, P/N 505H1)
Do not tape damaged cords. Replace any cord with nicks, cracked strain relief, or plug damage. The 505H1 fits both PRO 1.5+ and PRO 2+; the PRO 3+ uses the heavier 505J1.
Switch + seal (Ref #28, #31)
Always replace the switch (425B1) and the water-resistant seal (430A1) together. A compromised seal lets water into the switch cavity and shorts the motor.
Air filter service (Ref #32, P/N 470A1)
Inspect every 40 hours. Replace when gray with embedded concrete dust. Never run the motor without the filter installed. The PRO 2+ uses the same filter as the PRO 1.5+ — the PRO 3+ uses a larger filter (470B1) for its higher-amp continuous-duty cooling needs.
Maintenance Schedule
- Every shift: Inspect cord, plug, switch, housing. Clean concrete dust off exterior.
- Every 40 hrs: Clean or replace air filter.
- Every 50 hrs: Pull flex shaft core, inspect, re-grease with lithium grease (1/16" coat max).
- Every 200 hrs: Check brush length through service port. Replace pair if worn.
- Every 500 hrs: Inspect commutator for glazing or grooving.
- Annually (heavy use): Replace ball bearings.
Extension Cord Sizing (15 A draw)
| Cord length | Minimum AWG |
|---|---|
| 0–25 ft | 14 AWG |
| 26–50 ft | 12 AWG |
| 51–100 ft | Not recommended |
Outdoor cords must be marked W-A (e.g. SOW-A). 3-conductor grounded only. Use a GFCI in damp conditions. Undersized cords cause voltage drop, which increases amp draw and burns brushes, armature, and field windings. At 15 A, the PRO 2+ runs comfortably on a standard 15 A or 20 A circuit; running on a circuit already loaded with other tools will trip the breaker.
Shaft & Head Compatibility
Head diameter limits
The PRO 2+ is rated for the full Northrock head range — 3/4" through 2-1/2". Approved head sizes: 3/4", 1", 1-1/4", 1-1/2", 1-3/4", 2", and 2-1/2". This is the motor to buy if you want one power unit that can drive every Northrock head size without swapping to a larger motor for big pours.
Shaft lengths
Single shafts 2–21 ft. Maximum reach up to 60 ft using a Northrock shaft connector.
Multi-brand adapter chart
The PRO 2+ countershaft is universal. With the correct core adapter (160-series) and casing adapter (150-series), it runs shafts and heads from:
| Brand | Model(s) | Core Adapter | Casing Adapter |
|---|---|---|---|
| Northrock (native) | 1.5+, 2+, 3+ | 160AH1 | 150DW1 |
| Northrock Q.D. | 1.5+, 2+, 3+ QD | 160CW1 | 150DE1 |
| Wacker Neuson | M1000, M2000, M3000 | 160BD2 | 150DE1 |
| Wyco | 990, 991, 991-1/2 | 160CT1 | 150DG1 |
| Wyco | 902, 992 | 160BP1 | 150DG1 |
| Wyco | 992-1/2 | 160CT1 | 150DH1 |
| Wyco | 903, 993 | 160BP1 | 150DH1 |
| Oztec | 1.2, 1.8, 2.4, 3.2 | 160AH1 | 150CX1 |
| Oztec Q.D. | 1.2, 1.8, 2.4, 3.2 QD | 160CW1 | 150DE1 |
| Stow | Pencil | 160BF1 | 150DD1 |
| Stow | No Q.D. | 160BG1 | 150CY1 |
| Stow | With Q.D. | 160BD1 | 150DE1 |
| Mikasa / Multiquip | PMA-1, PMA-2, PMA-3 | 160DD1 | 150FR1 |
| Stone | 1, 1.5, 2, 3 HP | 160AH3 | 150DC1 |
| Master | CV10, CV15, CV20 | 160AH2 | 150DB1 |
| Dynapac | AH15, AH25 | 160DK1 | 150FX1 |
| Viber | VME | 160AH4 | 150CW1 |
| Denver | QM500, JM700 | 160BT1 | 150DJ1 |
| Dreyer | JE | 160CX1 | 150FH1 |
| Remington | VL | 160CT2 | 150DF1 |
| Remington | 1EV, 2EV, 3EV | 160BM1 | 150DF1 |
Brand not listed? Call +1 (202) 630-1027 or email [email protected] with your shaft brand, model, and head size.
Frequently Asked Questions
Match the Ref. # on the diagram to the row in the parts list at the right. Click a part name to see details, price, and add it to cart.
Confirm your model/series and serial number range on the product page. Many manufacturers have serial breaks, when in doubt, share your model and serial with us and we’ll verify fit.
The Ref. # points to the callout on the drawing. Qty shows how many of that item your machine uses. Parts are sold individually unless noted as a kit.
Yes, we supply genuine OEM parts for all our brands. If a part has an approved replacement, we ship the latest superseded revision
Manufacturers often supersede numbers. Our pages list the current orderable number and show older numbers in the description when available. Your old number will cross-reference to the correct part.
Yes. Some items are not pictured or are shared with other assemblies. Send us the model, serial, and a description (or photo) and we’ll locate it.
Yes. DanseUSA passes the manufacturer’s warranty to you. Coverage applies to defects in materials and workmanship under normal use for 30 days from the purchase date, in line with the manufacturer’s warranty policy. Terms can vary by brand; the product page reflects the applicable policy. If a claim is needed, we’ll help coordinate with the manufacturer.
Yes, most new, uninstalled items can be returned under our standard policy. Please see our Returns & Refunds Policy for eligibility, timeframes, and any exceptions.