Product Introduction
This curated parts set covers all high-wear and critical components for the BJ Varco 6600 Kelly Spinner, including air motor parts (rotor blades, air motor, master valve), precision bearings (Timken tapered bearings, NSK ball bearings), full gasket sets, O-rings, grease seals, clutch assemblies, spacers, oil sight gauges, and mufflers. Each component is built to match the original equipment’s performance specs: bearings use premium Timken/NSK hardware for heavy load capacity, gaskets and seals use oil-resistant, high-temperature materials to prevent air and lubricant leaks, and air motor parts are precision-machined for consistent airflow and torque delivery. This catalog includes only verified OEM-spec parts, so you avoid the risk of cheap aftermarket parts that fail mid-operation.
Functional Performance Specifications
These Varco 6600 parts deliver consistent, field-proven performance under harsh rig conditions: the 1-1/2” master valve regulates air pressure smoothly at 80–120 PSI for reliable clutch engagement; Timken cone/cup bearings (LM742745/LM742710) hold a 20,000-hour L10 service life to handle heavy torque loads; air motor rotor blades maintain steady rotation speed for efficient make-and-break work; and all seals hold a leak rate below 0.5 SCFM at full operating pressure to eliminate air loss. The clutch assembly locks torque securely, while oil sight gauges let crews check lubrication levels quickly without disassembly.
Structural & Material Features
- Precision OEM Fit: All parts are machined and molded to tight tolerances (±0.0003 inch) to align perfectly with the 6600 Kelly Spinner’s housing and moving parts, preventing misalignment and premature wear.
- Heavy-Duty Materials: Bearings use hardened alloy steel for shock resistance; gaskets and O-rings use nitrile rubber that stands up to drilling mud, oil, and temperatures from -40°F to 350°F; structural spacers and retainers use rugged carbon steel to handle rig floor vibration.
- Serviceable Design: Parts like gaskets, bearings, and seals are designed for quick field replacement, so repairs can be done in hours instead of days; retainer rings and bearing spacers lock components in place to reduce loosening from vibration.
- Sealed Protection: Grease seals and shielded ball bearings keep dirt, mud, and debris out of internal components, extending the life of moving parts and reducing frequent maintenance.
Applicable Operating Conditions
These parts are built for the toughest drilling environments, optimized for the BJ Varco 6600 Kelly Spinner used on land rigs, offshore drilling platforms, and mobile service units. They perform reliably in ambient temperatures from -30°F to 140°F, resist corrosion from saltwater and drilling fluids, and hold up to continuous cyclic loading from daily make-and-break operations. All components meet API 7K safety standards, making them suitable for conventional drilling, cementing, and hydraulic fracturing operations.
Maintenance & Service Recommendations
- Inspect all gaskets, O-rings, and grease seals every 3 months for cracks, swelling, or wear; replace worn seals immediately to stop air leaks and lubricant loss.
- Lubricate bearings and clutch components with approved high-temperature grease every 500 operating hours to reduce friction and prevent seizing.
- Check the oil sight gauge weekly to ensure proper lubrication levels; replace the sight gauge if it cracks or clouds over for clear visibility.
- Inspect air motor rotor blades and master valve every 6 months for wear or blockages; clean the muffler regularly to prevent exhaust backup and motor strain.
- Keep stock of high-wear parts (gaskets, bearings, O-rings, seals) on hand to cut downtime during emergency repairs.
- We supply the following spare parts:
| DESCRIPTION |
| NOV BJ Varco Parts |
| Muffler |
| PART NO. 72821 |
| Varco – Mdl 6600 Kelly Spinner |
| Upper and Lower Body Assy |
| Gasket, Upper |
| PART NO. 73610 |
| Varco – Mdl 6600 Kelly Spinner |
| Upper and Lower Body Assy |
| Gasket, Motor |
| PART NO. 73473 |
| Varco – Mdl 6600 Kelly Spinner |
| Upper and Lower Body Assy |
| Spacer, Upper |
| PART NO. 73458 |
| Varco – Mdl 6600 Kelly Spinner |
| Upper and Lower Body Assy |
| Bearing |
| PART NO. 73618 |
| Varco – Mdl 6600 Kelly Spinner |
| Upper and Lower Body Assy |
| Gasket, Lower |
| PART NO. 73609 |
| Varco – Mdl 6600 Kelly Spinner |
| Upper and Lower Body Assy |
| Gasket, Bottom |
| PART NO. 73575 |
| Varco – Mdl 6600 Kelly Spinner |
| Upper and Lower Body Assy |
| Ring, O |
| PART NO. 51300-249B |
| Varco – Mdl 6600 Kelly Spinner |
| Upper and Lower Body Assy |
| Clutch |
| PART NO. 73469 |
| Varco – Mdl 6600 Kelly Spinner |
| Upper and Lower Body Assy |
| Spacer, Lower |
| PART NO. 73459 |
| Varco – Mdl 6600 Kelly Spinner |
| Upper and Lower Body Assy |
| Gasket, Seal Retainer |
| PART NO. 70808 |
| Varco – Mdl 6600 Kelly Spinner |
| Upper and Lower Body Assy |
| Seal – Grease, Sub (Lower & Upper) |
| PART NO. 6563 |
| Varco – Mdl 6600 Kelly Spinner |
| Upper and Lower Body Assy |
| 53X4507 Garlock |
| Gauge, Oil Sight |
| PART NO. 74004 |
| Varco – Mdl 6600 Kelly Spinner |
| Upper and Lower Body Assy |
| Bearing, Cone |
| PART NO. 6544-2 |
| Varco – Mdl 6600 Kelly Spinner |
| Upper and Lower Body Assy |
| LM742745 – Timken |
| Cup, Bearing |
| PART NO. 6544-1 |
| Varco – Mdl 6600 Kelly Spinner |
| Upper and Lower Body Assy |
| LM742710 – Timken |
| Gasket, Body |
| PART NO. 70812 |
| Varco – Mdl 6600 Kelly Spinner |
| Upper and Lower Body Assy |
| Motor, Air |
| PART NO. 70814 |
| Varco – Mdl 6600 Kelly Spinner |
| Upper and Lower Body Assy |
| Valve, Master, 1-1/2″ |
| PART NO. 2753A 8011 |
| Varco – Mdl 6600 Kelly Spinner |
| Upper and Lower Body Assy |
| Cone, Bearing |
| PART NO. 6543-2 |
| Varco – Mdl 6600 Kelly Spinner |
| Upper and Lower Body Assy |
| LM742749 – Timken |
| Spacer, Bearing |
| PART NO. 14694-40 |
| Varco – Mdl 6600 Kelly Spinner |
| Air Motor Assy |
| Blade, Rotor |
| PART NO. 74555-11 |
| Varco – Mdl 6600 Kelly Spinner |
| Air Motor Assy |
| Rotor, Air Motor |
| PART NO. 74555-12 |
| Varco – Mdl 6600 Kelly Spinner |
| Air Motor Assy |
| Gasket, Cover |
| PART NO. 74555-20 |
| Varco – Mdl 6600 Kelly Spinner |
| Air Motor Assy |
| Plate End, Upper |
| PART NO. 74555-21 |
| Varco – Mdl 6600 Kelly Spinner |
| Air Motor Assy |
| Plate End, Lower |
| PART NO. 74555-23 |
| Varco – Mdl 6600 Kelly Spinner |
| Air Motor Assy |
| Bearing Ball (2 Shields), Lower Output Shaft |
| PART NO. 74555-30 Spinner/SSW 40 |
| Varco – Mdl 6600 Kelly Spinning Wrench |
| Air Motor Assy |
| 6205-2Z NSK, 205KDD Fafnir |
| Seal |
| PART NO. 74555-2 |
| Varco – Mdl 6600 Kelly Spinner / SSW 40 |
| Spinning Wrench – air Motor Assy |
| Ring, Retainer |
| PART NO. 74555-3 |
| Varco – Mdl 6600 Kelly Spinner / SSW 40 |
| Spinning Wrench – air Motor Assy |
| Pinion, Gear, 19 Teeth |
| PART NO. 74555-4 |
| Varco – Mdl 6600 Kelly Spinner / SSW 40 |
| Spinning Wrench – air Motor Assy |
| Bearing Ball |
| PART NO. 74555-5 |
| Varco – Mdl 6600 Kelly Spinner / SSW 40 |
| Spinning Wrench – air Motor Assy |
| 14694-37, 5204-RS |
| Standpipe Assembly, Master Valve |
| PART NO. 11952 93571-1 |
| Varco – Mdl 6600 Kelly Spinner |
Field Failure Repair Case Studies
Case 1: Bearing Seizure Stops Kelly Spinner
A land rig’s Varco 6600 Kelly Spinner seized mid-operation due to a failed Timken bearing cone (6544-2) from lack of lubrication. Replacing the OEM bearing cone and cup set restored smooth rotation, eliminated vibration, and got the spinner back to work without further damage to the air motor.
Case 2: Air Leak Causes Low Torque Output
The 6600 spinner lost torque and struggled to make drill pipe connections, traced to a worn upper body gasket (73610) and motor gasket (73473) that caused massive air loss. Installing new OEM gaskets sealed the housing, restored full air pressure, and fixed the torque issue instantly.
Case 3: Clutch Slippage During Casing Makeup
Clutch slippage made casing make-and-break slow and unsafe, caused by a worn OEM clutch (73469). Swapping in the factory-spec clutch eliminated slippage, restored consistent torque transfer, and prevented cross-threading of expensive casing threads.
Frequently Asked Questions (FAQ)
| Question | Answer |
| Will these parts fit only the BJ Varco 6600 Kelly Spinner? | Yes, every part in this list is designed exclusively for the NOV BJ Varco Model 6600 Kelly Spinner, matching OEM part numbers and dimensions for perfect drop-in fitment. |
| Do these bearings meet industry load standards for rig use? | Absolutely, the Timken and NSK bearings meet API 7K load standards, built to handle the 6600 Kelly Spinner’s full torque capacity and heavy rig floor loads. |
| Can these parts be used for routine maintenance and emergency fixes? | Yes, these OEM-spec parts work for both scheduled preventive maintenance and emergency field repairs, helping you minimize costly rig downtime. |
Procurement Guidance & Closing Value Statement
This NOV BJ Varco 6600 Kelly Spinner parts catalog acts as both a formal procurement standard and a hands-on technical reference, designed to eliminate the risks of low-quality aftermarket parts, reduce long-term maintenance costs, and protect the safety and reliability of your rig floor equipment. Every part is verified to meet OEM performance and quality standards, ensuring consistent operation, extended equipment life, and compliance with industry safety requirements.
