The drawworks dynamic braking grid resistor assembly in a Ross Hill / NOV system — where braking energy is dissipated as heat.
Independent sourcing, not an authorized distributor. Ross Hill and NOV are trademarks of their respective owners, used here for reference only. We supply this item as new-surplus, used-tested, and reconditioned, with condition disclosed before sale.
| Part number | 0100-1000-04 |
|---|---|
| EI reference | EI-0100-1000-04 |
| Stock code | CA00-1000-04 |
| System | Ross Hill / Hill Hayes / NOV SCR drilling |
| Function | Dynamic braking |
| Condition | New-surplus, used-tested, reconditioned |
| Also searched as | 0100-1000 · 0100-1000-04 · 0100100004 · EI-0100-1000-04 · CA00-1000-04 · Ross Hill · NOV · Hill Hayes |
During dynamic braking the drilling motor acts as a generator and that energy has to go somewhere. The grid resistor bank dissipates it as heat. These assemblies live hard: thermal cycling, vibration, and weather. Failures are usually open elements, cracked grids, or degraded connections rather than anything subtle.
Most people arrive at this page from a symptom, not a part number. These are the failure signatures associated with this item. They are starting points for diagnosis, not a substitute for it.
| What you are seeing | What it usually indicates |
|---|---|
| Reduced or absent dynamic braking capability | Open element in the bank |
| Visible cracked, burned, or distorted grid elements | Inspect the full bank, not just the visible face |
| Braking effort falls off as the assembly heats | Partially degraded elements |
| Discolored or loose terminations at the bank | Connection resistance — a common and repairable cause |
Revisions differ across the production life of this equipment, and on some Ross Hill items the dash suffix carries a calibration rather than a revision level. We verify the exact dash number and revision against the physical unit before quoting, and we will send photos of the plate on the unit we are offering.
Send a photo of your nameplate, or type out what it reads, and we will match the revision rather than guess at it.
Supplied as new-surplus (unused, from the secondary market), used-tested, or reconditioned, with condition disclosed before sale and photos on request. Availability on legacy Ross Hill and NOV items changes constantly — send the number and we will tell you what we can actually find rather than quote something we cannot deliver.
Condition always disclosed before sale. Photos on request. Same-day response on most requests.
Condition disclosed before sale. Same-day response on most requests.