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About Northrock PRO-1200G Gas Ceiling Grinder Parts
Replacement parts for the Northrock PRO-1200G, the gasoline configuration of the PRO-1200 ceiling grinder. Honda 4 HP engine parts, flexible shafts, grinding heads, and frame components for outdoor concrete grinding.
The Northrock PRO-1200G is the gasoline configuration of the PRO-1200 ceiling grinder, designated by the manufacturer for outdoor use. It uses a 4 HP Honda gas engine (P/N 555C1) mounted on the same mast and frame as the electric model, driving the grinding head through a 7 ft flexible shaft.
DanseUSA is an authorized Northrock dealer stocking every documented PRO-1200G replacement part, from the 4 HP Honda gas engine assembly down to individual ball bearings, dust seals, and hardware. Every part number on this page matches the official Northrock PRO 1200 / PRO 1200V instruction manual so contractors can cross-reference directly from their parts diagram. In-stock orders placed before 12 PM ET ship the same business day.
Need parts for the indoor electric version? See Northrock PRO-1200 Electric Ceiling Grinder Parts.
| Specification | Detail |
|---|---|
| Engine | 4 HP Honda Gas Engine (P/N 555C1) |
| Power Source | Gasoline, no electrical outlet required |
| Designated Use | Outdoor jobsites |
| Ceiling Reach | 7 ft to 12 ft (winch-adjustable) |
| Grinding Head Thread | 5/8"-11 R.H., accepts standard grinding stones |
| Drive System | 7 ft flexible shaft with rubber-coated steel braiding (P/N 30AK7) |
| Pressure System | Spring-loaded cam-lock arm for constant, even ceiling contact |
| Mobility | Solid rubber tires with swivel caster |
| Dust Control Option | Integrated vacuum guard with brush seals plus dual HEPA cart for OSHA silica compliance |
The PRO-1200G is documented as 10 sub-assemblies in the Northrock service manual. Select any assembly below to view the exploded parts diagram, identify components by reference number, and order the exact part you need.
Grinding Head Assembly
Ball bearings (140C003), inner housing (105BG1), outer housing (105BH1), compression spring (465C1), wiper dust seal (680A1), grinding head spindle, complete grinding head (25AM1)
Guard Assembly
Vacuum guard assembly (270E3), brush guards (670A1, 670B1), brush holders (495B1, 495C1), wiper dust seal (680A1), washer guard (370G1), pan head screws (190F175)
Gas Engine Power Unit
4 HP Honda gas engine (555C1), gas core adapter (160EE2), gas casing adapter (150HR2), casing adapter plate (215BE1), mounting hardware
Gas Engine Hanger Assembly
Gas engine plate (440X1), gas engine hanger (440W1), end caps (400M1), hex head bolts, nyloc nuts (211B500), complete hanger assembly (440AH1)
Flexible Shaft Assembly
7 ft outer casing (275Y7), 7 ft inner core (250T7), 7 ft complete shaft assembly (30AK7) with rubber-coated steel braiding
Base Frame Assembly
Base frame (440F1), swivel caster (590B1), solid rubber tires (590A1), cotter pins (180E1), hex head bolts, end caps (400M1)
Main Frame Assembly
Main frame (440H1), handle (165D1), pulley (590C1), locking knob (365B1), cable assembly (315B2), winch (595A1), tension handle (165E1), chain lug (280A222)
Mast & Cross Beam Frame
Mast (440K1), cross beam (440J2), tension spring (465B1), chain (315C1), eye bolts (570A1), hinge pin (180C1), hitch pins (180E3), plates with grommets (215AX2)
Vacuum Assembly
Vacuum frame (440Y1), vacuum unit (645A1), vacuum hose (640A1), hose clamp (695A1), wiper seal (680A1), complete vacuum assembly (645B1)
Dual Vacuum Cart Assembly
Cart frame (440AN1), handle (440AP1), two vacuums or HEPA pair (645A2), Y-hose adapter kit (640B1), four swivel casters, complete cart (645B3 or 645B3H HEPA)
Maintenance and replacement guidance below is drawn directly from the official Northrock PRO 1200 / PRO 1200V instruction manual. Several parts are gas-specific and are not interchangeable with the electric PRO-1200.
- Flexible shaft inner core (inside 30AK7) - Per the manual, inspect the inner core for lubrication after approximately 50 hours of operation. Remove the core on a clean surface free of dirt and grit, inspect for dry areas, and if lubrication is required wipe the core with cloth and reinsert applying a 1/16" coating of high-quality lithium grease. Do not over-grease, as excess lubricant causes drag on the power unit and the shaft to get hot.
- Grinding head bearings (140C003) - The manual specifies checking grinding head bearings for wear and replacing as needed. The grinding head assembly uses three of these ball bearings.
- Gas core adapter (160EE2) - This adapter is gas-specific to the PRO-1200G. The electric PRO-1200 uses core adapter 160ED2. The two are not interchangeable.
- Honda engine service - The 555C1 gas engine has its own service schedule covered by the engine manufacturer. Per the Northrock manual, see the engine manufacturer manual for service and maintenance requirements, and consult an authorized engine service center for any service or maintenance work.
- Wiper dust seal (680A1) - The manual specifies checking seals for wear and replacing as needed. The 680A1 wiper dust seal is used in the grinding head, vacuum guard, vacuum, and dual vacuum cart assemblies, so contractors often keep spares on hand.
- Tension spring (465B1) - Part of the mast and cross beam frame assembly. Per general maintenance guidance in the manual, replace as needed for wear.
Most structural parts grinding head, guard, flexible shaft, main frame, mast and cross beam, base frame, vacuum, dual vacuum cart are shared between both models in the Northrock manual. The differences are concentrated in the power unit and motor hanger:
| PRO-1200G Gas | PRO-1200 Electric | |
|---|---|---|
| Power Unit | 4 HP Honda Gas Engine (555C1) | 1.5 HP Baldor Electric (555B1) |
| Power Source | Gasoline, no outlet required | 115V or 220V wall outlet |
| Designated Use | Outdoor | Indoor environments |
| Motor Plate | Gas engine plate (440X1) | Electric motor plate (440M1) |
| Motor Hanger | Gas engine hanger (440W1) | Electric motor hanger (440L1) |
| Casing Adapter | 150HR2 | 150HK2 |
| Core Adapter | 160EE2 | 160ED2 |
Honda Gas Engine
Per the Northrock manual, see the engine manufacturer manual for service and maintenance requirements. Consult an authorized engine service center for any service or maintenance work. Always remove the spark plug wire and ensure the switch is in the off position before assembly or accessory changes.
Flexible Shaft
After approximately 50 hours of operation, remove the inner core on a clean surface free of dirt and grit. Inspect for dry areas. If lubrication is required, wipe the core with cloth and reinsert applying a 1/16" coating of high-quality lithium grease. Do not over-grease.
Grinding Head
Per the manual, check grinding head bearings (140C003), seal (680A1), spindle, and spindle thread for wear and replace as needed. The 5/8"-11 R.H. spindle thread accepts grinding stones.
Safety and General
Per the manual, never start the grinder with the head pressed to the ceiling. Start the engine first, then push the tension handle into the down position to begin grinding. Always re-tighten the mast lock handle fluted knob after adjusting mast height, and periodically check all bolts for snugness.
Questions About Your PRO-1200G Gas Grinder?
Share your model and serial number with our parts team. We confirm exact fitment before every order, including gas-versus-electric component differences.
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.