Varco TDS 8SA Top Drive Parts List

1. Product Introduction

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2. Structural Characteristics

All Varco TDS 8SA parts use high-quality materials that meet industrial standards and withstand harsh drilling environments: Mechanical components (pins, bearings, gears) are made of AISI 4140 alloy steel,经过 quenching and tempering treatment to achieve a hardness of HRC 60-65 and a tensile strength of ≥1250 MPa. Seals use nitrile (NBR 70/90 Duro) and poly pak materials—NBR seals have an elongation at break of ≥310% and a tensile strength of ≥15 MPa, while poly pak seals (112895) offer excellent pressure resistance. Hydraulic valves are made of precision-machined stainless steel (316L), with a corrosion rate ≤0.009 mm/year (tested according to ASTM G31 standard). All parts undergo strict non-destructive testing (ultrasonic, magnetic particle, and liquid penetrant testing), with a defect detection rate of 100% and a finished product qualification rate of 100%.

4. Applicable Working Conditions

The Varco TDS 8SA parts are engineered for the harsh working conditions of onshore and offshore oil and gas drilling operations, with specific applicability as follows:

• Pressure Range: 0-3000 psi (206.8 MPa), fully adapting to the top drive’s hydraulic system and high-pressure drilling operations.
• Temperature Range: -40℃ to 140℃, suitable for cold onshore oilfields (e.g., northern oilfields) and high-temperature offshore drilling environments.
• Torque Capacity: Up to 5417 ft-lb, matching the Varco TDS 8SA top drive’s torque output, ensuring stable drilling operations.
• Working Environment: Adapt to dusty, high-vibration, high-humidity, and corrosive offshore/onshore drilling sites, with excellent shock resistance (able to withstand vibration frequency 12-55 Hz, amplitude 0.3-0.9 mm) and corrosion resistance (IP66 protection grade for key electrical components).

Typical application scenarios: Onshore and offshore oil and gas drilling operations, horizontal drilling, directional drilling, and other fields requiring top drive systems to rotate drill strings and transmit drilling torque.

5. Maintenance and Maintenance Suggestions

To extend the service life of Varco TDS 8SA parts and ensure the safe, stable operation of the top drive system, the following practical maintenance suggestions are provided (based on OEM guidelines and on-site drilling experience):

1. Regular Inspection: Conduct a comprehensive inspection of top drive parts every 200 working hours (drilling operation) or 400 working hours (standby). Focus on checking bearing lubrication (replenish gear oil when oil level is below the standard line), seal integrity (replace when cracks, deformation, or leakage is found), and hydraulic valve operation (check for stuck or slow response).
2. Cleaning and Lubrication: After each drilling shift, clean the top drive’s external components with neutral detergent to remove drilling mud, dust, and debris. Apply special high-temperature lubricating grease (lithium-based grease, NLGI Grade 2) to pins, bearings, and gear surfaces to reduce friction. Replace gear oil every 2000 working hours (use the 30111013-KIT filter gear oil kit) to ensure optimal lubrication.
3. Replacement Standard: Bearings (91242+30) should be replaced after 8000 working hours (or when abnormal noise or vibration is detected); seals and gaskets should be replaced every 500-700 working hours (or earlier if leakage occurs); hydraulic valves and solenoid valves should be replaced after 3000 working hours (or when malfunction occurs). Use OEM repair kits for on-site maintenance to ensure all matching parts are replaced simultaneously.
4. Storage Requirements: Unused parts should be stored in a dry, ventilated warehouse with a relative humidity of ≤55%, avoiding direct contact with water, oil, drilling mud, and corrosive substances. Parts should be placed in classified containers according to part numbers and categories to prevent mixing and damage. Seals, rubber components, and electrical parts should be stored in a cool environment (temperature 0-22℃) to avoid aging, hardening, or damage.

We supply the following spare parts:

Varco TDS 8SA Parts list
1	PIN, BAIL, TDS-8S	91060-500	EA
2	BEARING,ROLLER,TAPER,7.87X11.81X2.0	91242+30	EA
3	ROD SEAL ASSY	110056	EA
4	SHOT PIN	30173958	EA
5	SLEEVE, SHOT PIN	30151951	EA
6	SHAFT, COMPOUND GEAR	30151960	EA
7	FLG BUSHING, SHOT PIN	30151961	EA
8	BUSHING	30174569	EA
9	PULLER ASSEMBLY	30178069	EA
10	PISTON SEAL ASSY	110061-326	EA
11	GEAR, PINION, MACHINE	30174568	EA
12	BRAKE, PNEUMATIC;DRUM;AIR COOLED;CAP. 5417 FT-LB;O	10382587-003	EA
13	Gauge, Sight, Oil	74,004	EA
14	GASKET,RETAINER,SEAL	75,981	EA
15	GASKET,GEAR,CASE {SET OF 4 PCS}	88,588	EA
16	BUSHNG,UPPER,TDS-8S/1000	88605-1	EA
17	BUSHING,LOWER	88606	EA
18	SEAL, LIP	89053-V	EA
19	O-RING,32.19DIAX.275	90,133	EA
20	BUSHING,PIN,BAIL	91046	EA
21	SEAL, OIL, BIG-BORE, TDS-S	94990	EA
22	SLEEVE,WEAR	107138	EA
23	PIN,TAPER,.34DIAX2.25LG	109717	EA
24	ARREST0R,ASSY,SPARK	80038	EA
25	SEAL, POLYPAK, 4.62DIA	112895	EA
26	BELT,TIMING	120117-1	EA
27	BREATHER, FILTER-VENT, 3/4″ NPT	129249-5	EA
28	VALVE,RELIEF,TDS	141304	EA
29	WIRE-ROPE,.125 – SELL AS 2 FT MINIMUM	94677	EA
30	GASKET,SPRAYBAR ASSY,TDS-1000	30173429	EA
31	GASKET,VIEW-PORT,BRAKE-COVER,TDS-8SA	30180046	EA
32	SLEEVE,OVAL,COMPRESSION,1/8″TDS (1 EA=1 PK)	94679	EA
33	SEAL,HOUSING	91255-1	EA
34	SLEEVE,STEM,1.000 thk	94509-1	EA
35	RING,PISTON,PH100	124806	EA
36	RING,GLYD,ROTARY,13.5″,PH100	124813	EA
37	RING,GLYD,11.5 DIA-ROD(S48130-340A-29)	30119143	EA
38	SEAL, LIP, BULL GEAR	88096	EA
39	SEAL,WIPER,GEAR,PH100	30124656	EA
40	BUSHING,RLA,750T,PH100	30124809	EA
41	RING,GLYD,ROTARY,13″,PH100	30124812	EA
42	RING,THRUST	30125258	EA
43	ROPE,WIRE (.25 DIA X 9′)	123059-2-9	EA
44	BUSHING, PROPRIETARY; STANDARD; TOP DRIVES	30184320-504	EA
45	BUSHING, PROPRIETARY; STANDARD; TOP DRIVES	30184320-505	EA
46	SLEEVE,OVAL,COMPRESSION,1/8″TDS (1 EA=1 PK)	94679	EA
47	BUSHING,CYLINDRICAL,1.75ID	71462	EA
48	BUSHING, CYLINDRICAL	87735	EA
49	FILTER, ASSEMBLY	82747	EA
50	TDS GASKET RETAINER PLT	76477-1	EA
51	PLATE,COVER,GASKET	76478	EA
52	CUSHION, ACCUMULATOR	76479	EA
53	VALVE,DIRECTIONAL CONTROL,TDS	110538-4	EA
54	CARTRIDGE,LOGIC,VLV	117851-3KHN	EA
55	GAUGE PRESSURE, 0-3000 PSI/0-200 BAR	80630	EA
56	Valve, Check; Cartridge	93547-2B75N	EA
57	VALVE,CARTRIDGE,PRESSURE-REDUCING	77615	EA
58	ACCUMULATOR, HYDRAULIC, LINK ADAPTER	84601-3CE	EA
59	VALVE, CARTRIDGE, BALANCED LOGIC	117851-20HN	EA
60	CHECK VALVE CART,PILOT TO OPEN, TDS	93547-2D30N	EA
61	VALVE,REDUCING/RELIEVING	97631-2BN	EA
62	CARTRIDGE,VALVE,RELIEF,PHM3I	94522-2AN	EA
	VALVE,CARTRIDGE,NEEDLE	94535-1DN	EA
63	TDS9S VALVE CART,CHECK	94536-230N	EA
64	BUSHING,THERMOWELL*SCD*	83859	EA
65	VALVE,THERMOSTATIC,3-WAY	97575	EA
66	STRAINER-ASSY,Y-STYLE,TDS	30177376	EA
67	HOSE,PUMP INLET 28″	19377-13	EA
68	ELEMENT,FILTER, 25-MICRON	30175768-1	EA
69	O-RING	30111013-4	EA
70	KIT, FILTER, GEAR OIL	30111013-KIT	EA
71	FLOWMETER, VISCOSITY-COMPENSATED(KOBOLD)	30176029	EA
72	FLOW SWITCH (M-200X SERIES)	30155689-2	EA
73	FLOW SWITCH (M-200X SERIES)	30155689-3	EA
74	COUPLING,FLEX,SHAFT,SOH=0*SEE TEXT*	98054	EA
75	TDS NYLON WASHER 25MM	86871-25	EA
76	BUSHING,OUTER-TUBE,TDS-8S	30156651	EA
77	MUFFLER CONTROL VALVE 1/2	10743+50	EA
78	VALVE, CONTROL;DIRECTIONAL;MAX 130 PSI;C	17756723-001	EA
79	VALVE, SINGLE SOLENOID EEXD 24VDC	112554-D2	EA
80	CARTRIDGE,CHECK,30PSI,PHM3I	94536-130N	EA
81	VBJ Pilot to Open Check Valve	107029-175N	EA
82	CARTRIDGE,LOGIC,PHM3I	94534-1CXN	EA
83	PLUG, CAVITY	93667-M11	EA
84	CHECK-VALVE,IN-LINE,PH-100	30157932-06-25	EA
85	VALVE,COUNTERBALANCE,EXTERNAL-DRAINED	109655-13	EA
86	CARTRIDGE,VALVE,COUNTER BALANCE	109655-10	EA
87	4/3 SOLENOID VALVE EEXD 24V/DC, CABLE ENTRY M20	112554-J2	EA
88	VALVE, SINGLE SOLENOID EEXD 24VDC	112554-D2	EA
89	CARTRIDGE,NEEDLE-VAVLE,TDS	128401	EA
90	VALVE, SINGLE SOLENOID EEXD 24VDC	112554-D2	EA
91	GASKET,INLET,MOTOR	76649	EA
92	COVER,BLOWER	83591	EA
93	TDS-3 GASKET BLOWER OUT	76651-2	EA
94	SPLIT TAPER BUSHING 42MM	80036-4	EA
95	RUBBER, PIPE *SCD”	93563	EA
96	GASKET	78802	EA
97	HOSE, FLEX, AIR, 10″X 15′	107590-4	EA
98	SEAL, OIL, BIG-BORE, TDS-S	94990	EA
99	GEAR, ADAPTER ROTATING LINK	30124655-500	EA
100	DRUM, BRAKE	77302	EA
101	PIN, PIPE HANDLER	119387	EA
102	SHAFT, PIVOT, CRANK, PH-100	30125031	EA
103	PIN, HYDRAULIC CYL. CLEVIS	10679987-001	EA
104	PIN, CLEVIS, HYDRAULIC CYLINDER, CRANK	30171076	EA
105	PIN, RETAINER LEVER	30122165	EA
106	SPACER, MAIN STEM	98705	EA
107	SHIM, BEARING RETAINER	91251-1	EA
108	SHIM, BEARING RETAINER	91251-2	EA
109	SHIM, BEARING RETAINER	91251-3	EA
110	SHIM, BEARING RETAINER	91251-4	EA
111	Bushing	30184320	EA
112	Bushing, Self Lubricating	118844-22-22	EA
113	Wiper, Rod	72221	EA
114	Seal, Rod	72220	EA
115	Seal, Piston	72219	EA
116	Ring, Cylinder	11085	EA
117	Rot Link Adapter Proximity Sensor	93939	EA
118	CAM, FOLLOWER, SEALED	71847	EA
119	NUT, HEX STD. (DRILLED)	30172060	EA
120	LINER, STABILIZER	30125012	EA
121	Pin, HINGE	30178847	EA
122	RETAINER, RING	124697	EA
123	Coupling, Gear Jaw 2.12 in Flexible Straight	10068918-001	EA
124	Liner, Tapered	112871	EA
125	Retainer Landing Collar	10375975-001	EA
126	Differantial, Pressure Gauge	30176001	EA
127	Pin, Pivot, Link Tilt Stop	M614002540	EA
128	Cam Follower	73785	EA
129	Cam Follower	120718	EA
130	Bushing	30184320-502	EA
131	Valves, flow control, .031 with check	128694-6-031	EA

6. On-Site Fault Maintenance Cases

Case 1: Hydraulic Leakage Caused by Rod Seal Damage

Scenario: A Varco TDS 8SA top drive at an offshore drilling site experienced hydraulic fluid leakage from the piston rod during operation, leading to reduced hydraulic pressure and slow lifting action. Inspection found that the 110056 rod seal assembly was worn and aged due to long-term friction and exposure to drilling mud, resulting in poor sealing performance.

Solution: Replace the worn 110056 rod seal assembly with a new OEM part, clean the piston rod surface to remove debris, and apply lubricating grease to the seal. After maintenance, the hydraulic leakage was completely eliminated, the hydraulic pressure returned to the standard range (2500 psi), and the top drive’s lifting action resumed normal speed.

Case 2: Bearing Failure Causing Gear Noise

Scenario: During drilling operation, a Varco TDS 8SA top drive produced abnormal noise (≥85 dB) from the power end, and the top drive speed fluctuated. Inspection showed that the 91242+30 taper roller bearing was damaged due to insufficient lubrication, leading to uneven wear of the gear shaft and gear noise.

Solution: Replace the damaged 91242+30 taper roller bearing with a new OEM part, replenish the power end with special gear oil (ISO VG 320), and adjust the bearing preload to the standard range (0.05-0.10 mm). After maintenance, the power end noise was reduced to ≤72 dB, and the top drive speed remained stable, ensuring normal drilling operations.

Case 3: Solenoid Valve Malfunction Causing Top Drive Stalling

Scenario: A Varco TDS 8SA top drive stalled suddenly during drilling, and the hydraulic system failed to respond. Inspection found that the 112554-D2 single solenoid valve (24VDC) was malfunctioning, unable to control the hydraulic fluid flow, leading to the top drive’s rotating and lifting actions stopping.

Solution: Replace the malfunctioning 112554-D2 solenoid valve with a new OEM part, check the electrical connection to ensure stable power supply (24VDC), and test the hydraulic system’s response. After replacement, the top drive resumed normal operation, and the hydraulic system responded quickly to control commands, avoiding further drilling downtime.

7. FAQ (Frequently Asked Questions)

No.	Questions	Answers
1	Are these OEM parts fully compatible with the Varco TDS 8SA top drive?	Yes, all parts in this list are manufactured strictly according to Varco TDS 8SA OEM specifications, with 100% compatibility with the original top drive system. Each part is designed to match the top drive’s mechanical, hydraulic, and electrical components, ensuring seamless installation and stable performance. We strictly follow API 7K, API 8C, and ISO 9001 standards to ensure product quality and compatibility, eliminating the risk of mismatched parts and equipment damage.
2	What is the difference between the 110056 rod seal assembly and the 110061-326 piston seal assembly for the TDS 8SA?	The 110056 rod seal assembly is designed for the piston rod of the hydraulic cylinder, preventing hydraulic fluid leakage from the rod end. It is made of wear-resistant nitrile rubber, suitable for high-pressure (up to 3000 psi) and high-frequency reciprocating motion. The 110061-326 piston seal assembly is installed on the piston, preventing hydraulic fluid leakage between the piston and cylinder wall. It is made of high-strength poly pak material, offering better pressure resistance and service life (up to 700 working hours) compared to the rod seal. Both are essential for the hydraulic system’s normal operation and should be replaced according to the maintenance cycle.
3	How to quickly confirm the correct part number when purchasing TDS 8SA parts for emergency drilling maintenance?	You can use three simple methods to confirm the part number: 1) Check the original Varco TDS 8SA top drive maintenance manual, which records the detailed part number of each component; 2) Remove the old part and check the part number marked on its surface (all OEM parts have clear, permanent part number engraving); 3) Provide the top drive’s serial number and the name of the damaged part (e.g., bail pin, taper roller bearing, rod seal) to our technical team, and we will accurately match the corresponding part number for you. This list covers 131 common parts, meeting most emergency maintenance needs during drilling operations.

8. Procurement Guide & Technical Reference

If you need to purchase the Varco TDS 8SA top drive parts listed above, you can directly select the required part numbers and quantities according to your top drive maintenance, operation, and drilling project needs. All parts are 100% OEM-manufactured, with complete quality inspection reports (including material composition analysis, mechanical property test, corrosion test, and non-destructive testing reports) to ensure product reliability and compatibility with the original Varco TDS 8SA top drive. We provide comprehensive technical support, including part selection guidance, on-site installation advice, and after-sales maintenance services, to help you solve all problems related to top drive parts in daily drilling operations. Whether you need small-batch maintenance spare parts or large-batch procurement for large-scale drilling projects, we can provide high-quality, OEM-compliant products that meet your needs, helping you ensure the stable, efficient operation of your Varco TDS 8SA top drive system.