Product Introduction
Our TDS-11S/TDS-11SH top drive parts lineup includes all critical rotating and sealing components for complete top drive servicing: tapered/cylindrical roller bearings, 500-ton thrust bearings, flanged/main shaft sleeves, bearing shields, upper bearing isolators, Polypak seals, lip seals, O-rings, fiberglass bushings, bronze sintered bearings, and heavy-duty locking fasteners. Crafted from high-grade alloy steel, 300 stainless steel, wear-resistant fiberglass, and high-pressure elastomers, each part undergoes load testing, wear resistance verification, and dimensional inspection to match NOV factory performance standards. This comprehensive selection supports main shaft bearing replacement, seal repairs, bushing upgrades, and full top drive teardown/reassembly, making it the definitive sourcing solution for TDS-11S/TDS-11SH maintenance.
Functional Capabilities
- Extreme Load Bearing Support: 500-ton thrust bearings and precision roller bearings handle heavy axial/radial loads, eliminating shaft wobble and maintaining consistent rotary torque during drilling.
- Leak-Free Lubrication Sealing: Polypak seals, lip seals, and O-rings create tight, high-pressure seals for lubricating oil, preventing leaks and contamination from drilling mud/debris.
- Shaft & Stem Wear Protection: Precision sleeves and liners shield main shafts and stems from abrasion, extending rotating component life and reducing replacement costs.
- Low-Friction Bushing Operation: Fiberglass and bronze sintered bushings reduce friction between moving parts, minimizing heat buildup and wear during continuous operation.
- Vibration-Resistant Fastening: Heavy-duty 12-point cap screws and lock washers maintain tight clamping force, preventing fastener loosening under extreme rig vibration.
- Bearing Isolation & Protection: Upper bearing isolators and shields block contaminants, preserving bearing lubrication and extending service life.
Structural Design Features
- Exact NOV OEM Fit: All parts match original NOV part numbers and dimensional tolerances (e.g., 200x310mm tapered bearings, 7.87ID flanged sleeves), ensuring seamless drop-in replacement.
- High-Load Alloy Construction: Bearings use hardened alloy steel rated for 500-ton thrust loads, with 300 stainless steel sleeves resisting corrosion in harsh oilfield environments.
- Wear-Resistant Materials: Fiberglasslide bushings and bronze sintered bearings offer superior abrasion resistance, outlasting standard components by 30%+.
- High-Pressure Seal Compatibility: Lip seals and Polypak seals are engineered for top drive lubrication systems, maintaining seals under high operating temperatures and pressures.
- API 7K/8C Compliance: All load-bearing and structural components meet global drilling equipment safety standards, ensuring regulatory approval for rig site use.
Applicable Operating Conditions
These TDS-11S/TDS-11SH top drive components are engineered to perform reliably in demanding drilling scenarios, including:
- NOV Varco TDS-11S and TDS-11SH top drive units (S/N: TC-2482006-01) for land/offshore drilling rigs
- Continuous high-torque rotary drilling with 500-ton maximum thrust load capacity
- High-vibration, high-dust rig sites with exposure to drilling mud, water, and abrasive contaminants
- Routine top drive maintenance, main shaft bearing overhauls, and seal replacement
- API 7K/8C compliant drilling operations requiring certified top drive components
Maintenance & Service Recommendations
- Inspect main shaft bearings and thrust bearings every 4,000 operating hours for wear, pitting, or noise; replace worn bearings to prevent shaft misalignment and torque loss.
- Check all seals (Polypak, lip, O-rings) quarterly for hardening, cracking, or leakage, replacing damaged seals immediately to stop lubricant loss and contamination.
- Lubricate bushings and bearings with NOV-approved high-temperature grease during assembly to reduce break-in wear and heat buildup.
- Tighten all 12-point cap screws and lock washers every 2,000 hours, verifying torque specs to prevent fastener loosening under vibration.
- Inspect sleeves and liners for abrasion or scoring every 6,000 hours, replacing worn components to protect main shafts from damage.
- Store spare bearings and seals in a dry, dust-free environment to preserve lubrication and seal integrity.
- We supply the following spare parts:
| TDS 11SH , NOV, S/N: TC-2482006-01 | ||
| No. | NOV Part No. | Description |
| 1 | 109519 | BEARING,ROLLER,TAPER,200X310MM |
| 2 | 109521 | BEARING,ROLLER,CYLINDRICAL,200X360MM |
| 3 | 109591 | SLEEVE,FLANGED,7.87ID,300SS |
| 4 | 110040-1 | SLEEVE, MAIN SHAFT, TDS11 |
| 5 | 30154362 | SHIELD, BEARING,SMALL BORE, TDS 4S |
| 6 | 30173521 | ISOLATOR,UPPER BEARING |
| 7 | 51016-C | Washer, Lock Heavy |
| 8 | 54016-28-CD | SCREW,CAP,12-POINT,DRILLED-HEAD |
| 9 | 91250-1 | OIL SEAL,TDS |
| 10 | 91829-1 | SLEEVE,STEM,STD.BORE,TDS |
| 11 | 98290 | LINER, STEM, UPPER |
| 12 | 10465013-001 | SEAL,POLYPAK,3.875,STD.BORE,TDS |
| 13 | P611002413 | BEARING,THRUST,500 TON TDS-11SH |
| 14 | 77039+30 | SEAL,LIP 8.25X9.5X.62 |
| 15 | 118844-16-08 | BUSHING,SLEEVE,1.00×0.50,FIBERGLIDE |
| 16 | 118844-16-12 | BUSHING,SLEEVE,1.00×0.75,FIBERGLIDE |
| 17 | 30184320 | BUSHING |
| 18 | 30184320-501 | BUSHING |
| 19 | 110008 | O-RING,.275×50.5 |
| 20 | 115176 | BUSHING,SLEEVE,1.0X1.25 |
| 21 | 112754-130 | BEARING,SINTERED,BRONZE,FLANGED |
Field Failure Repair Case Studies
Case 1: TDS-11SH Thrust Bearing Overload Failure
A 500-ton thrust bearing (P611002413) failed due to extreme load stress, causing shaft wobble and reduced drilling torque. Installing a new OEM-spec thrust bearing restored full load capacity and stable rotation.
Case 2: Main Shaft Oil Seal Leakage
A degraded TDS oil seal (91250-1) led to chronic lubricant leakage, risking bearing failure. Replacing the seal with a new high-pressure unit eliminated leaks and protected internal components.Case 3: Worn Cylindrical Roller Bearing VibrationA worn 200x360mm cylindrical roller bearing (109521) caused excessive vibration and noise during operation. Fitting a new precision bearing smoothed rotation and reduced equipment stress.
Frequently Asked Questions (FAQ)
| Question | Answer |
| Are these parts compatible with both TDS-11S and TDS-11SH top drives? | Yes, all components are precision-designed to fit both NOV Varco TDS-11S and TDS-11SH top drive models, matching OEM part numbers and dimensions. |
| What is the load rating of the thrust bearing included? | The thrust bearing (P611002413) is rated for a maximum 500-ton load capacity, designed specifically for TDS-11SH heavy-duty drilling operations. |
| Do these parts meet NOV OEM specifications and API standards? | Yes, all spares match NOV OEM material and tolerance specs, and load-bearing components comply with API Spec 7K/8C drilling equipment standards. |
Procurement Guidance
For top drive maintenance teams, rig managers, and procurement specialists tasked with keeping NOV Varco TDS-11S/TDS-11SH top drives running reliably and meeting API compliance, this catalog is your definitive sourcing solution for high-quality, OEM-matched spare parts. It provides full transparency on NOV part numbers, component descriptions, quantity requirements, and load specifications, serving as both a formal procurement compliance standard and a practical field troubleshooting reference for top drive repairs and overhauls. Whether you need bearings for load-bearing replacement, seals for leak prevention, sleeves for shaft protection, or bushings for friction reduction, every part is engineered to resolve common TDS-11S/TDS-11SH failures and deliver consistent, long-lasting performance in harsh drilling conditions. Submit your detailed inquiry with specific NOV part numbers, top drive model (TDS-11S/TDS-11SH), required quantities, and maintenance scope to secure precision-matched components tailored to your top drive needs.
