Core Application & Target User Requirements
This parts catalog is specifically engineered for Drawworks Disc Brake Systems (Compatible with Models: TY Series Service Calipers), focusing on delivering reliable, high-performance spare parts for service caliper assemblies and their core sub-assemblies. It addresses the critical needs of niche users including drilling rig maintenance supervisors, drawworks operation teams, and oilfield equipment after-sales engineers—specifically the demand for precision-machined, wear-resistant parts that minimize unplanned downtime during drilling hoisting operations. The core purpose is to ensure the service braking system maintains consistent clamping force, stable operation, and compliance with oilfield safety standards. All parts listed adhere strictly to original equipment manufacturer (OEM) specifications, providing a one-stop solution for routine maintenance, fault troubleshooting, and performance upgrades of drawworks disc brake service calipers.
1. Service Caliper Assembly & Core Friction Components
The service caliper assembly is the executive core of the drawworks disc brake system, translating hydraulic pressure into mechanical clamping force to achieve controlled braking. Core friction components like brake pads and steel backings directly determine braking efficiency and heat dissipation performance. In oilfield operations, these parts face extreme conditions—continuous high-temperature friction during braking, corrosion from saltwater and drilling fluids, and impact loads from sudden braking. Common failures include brake pad wear, steel backing deformation, and caliper body cracking, all of which can lead to reduced braking sensitivity or complete brake failure. The parts in this category feature high-strength, heat-resistant materials and precision manufacturing to extend service life and ensure operational safety.
No. | Part № | Description | Material | Primary Wear Causes | Damage Prevention Precautions |
1 | TY-00-7A | Service caliper | Ductile iron (QT450-10) with stainless steel guide rails | Fatigue cracking from repeated braking impact; corrosion of guide rails due to oilfield moisture; wear at sliding interfaces from inadequate lubrication | Inspect caliper body for cracks using magnetic particle testing every 6 months; lubricate guide rails with high-temperature (250℃+ resistant) grease monthly; avoid sudden, heavy braking to reduce impact loads |
2 | TY-1-7A | Brake pad | Ceramic fiber friction material bonded to high-strength steel backing | Abrasive wear from continuous disc contact; thermal fading and cracking at temperatures over 350℃; delamination of friction material due to oil contamination | Monitor friction material thickness (replace when below 3mm); keep brake pads free of oil/grease contamination; replace pads in pairs to ensure even braking force distribution |
3 | TY-2-7A | Steel backing | High-carbon alloy steel (S45C) with anti-corrosion coating | Plastic deformation from high braking pressure; corrosion from drilling fluids; wear at caliper mounting points | Check for flatness with a precision straightedge during maintenance; touch up anti-corrosion coating if scratched; ensure tight mounting to prevent vibration-induced wear |
2. Service Caliper Transmission & Fastening Components
Transmission and fastening components are responsible for transferring actuation force within the caliper and securing all sub-assemblies. In the high-vibration, high-load oilfield environment, these parts are prone to loosening, shear failure, and wear—issues that can cause caliper jamming or loss of braking force. For example, clevis pins and sleeves experience continuous rotational friction, while bolts and lock washers face vibration-induced loosening. Using substandard or worn components in this category poses significant safety risks, including sudden caliper failure during critical hoisting operations. The parts listed here feature precision machining, anti-loosening designs, and corrosion-resistant materials to ensure reliable force transmission and long-term fastening stability.
No. | Part № | Description | Material | Primary Wear Causes | Damage Prevention Precautions |
1 | GB93-87 | Lock washer 12 | Spring steel (65Mn) with zinc plating | Elastic fatigue from continuous vibration; zinc plating wear leading to corrosion; deformation from over-tightening | Do not reuse lock washers after disassembly; use a torque wrench to avoid over-tightening; replace if elasticity is reduced (test by compressing with pliers) |
2 | GB5782-86 | Hexagon head bolt M12×30 | Alloy steel (40Cr) with quenching and tempering treatment | Thread wear from repeated assembly/disassembly; shear failure from uneven load distribution; corrosion in humid environments | Apply anti-seize compound to threads before installation; torque to OEM specifications (45-50 N·m); inspect threads for damage before reuse |
3 | TY-3-7A | Sleeve | Brass (H62) with precision honing | Inner diameter wear from clevis pin rotation; corrosion from moisture; seizure due to lack of lubrication | Lubricate with molybdenum disulfide grease during assembly; check inner diameter wear with a micrometer (replace if wear exceeds 0.2mm); keep components dry during storage |
4 | TY-4-7A | Clevis pin with head | Stainless steel (304) | Shear wear at load-bearing points; corrosion from saltwater; head deformation from impact during installation | Ensure proper alignment with mating components to avoid lateral loads; use a brass hammer for installation to prevent head damage; inspect shear surfaces for cracks quarterly |
5 | TY-3-7A1 | Sleeve | Bronze (CuSn6) for high load resistance | Wear from high-pressure force transmission; oxidation in high-temperature environments; contamination-induced seizure | Use high-temperature resistant lubricant; clean sleeve bores thoroughly before assembly; replace if rotational resistance is detected |
6 | TY-5-7Ag | Lever | Alloy steel (Q355B) with forged construction | Fatigue bending from repeated force application; wear at hinge holes; corrosion from drilling fluids | Inspect for bending with a laser level every 3 months; ream hinge holes if wear exceeds 0.15mm; apply anti-corrosion paint to welded areas annually |
7 | TY-6-7A | Cover plate | Mild steel (Q235) with powder coating | Corrosion from dust and moisture; deformation from impact; powder coating peeling leading to rust | Clean cover plates regularly to remove dust/debris; touch up powder coating if scratched; ensure tight mounting to prevent vibration |
8 | GB879-86 | Slotted countersunk head screw M6×12 | Stainless steel (304) | Slot damage from mismatched screwdrivers; thread stripping from over-tightening; corrosion in damp environments | Use precision slotted screwdrivers matching the slot size; torque to 3-4 N·m; apply anti-rust oil to threads for long-term storage |
9 | GB6170-86 | Nut M16 | Alloy steel (40Cr) with galvanization | Thread wear from repeated use; vibration-induced loosening; galvanization breakdown leading to corrosion | Use lock washers in conjunction with nuts; retighten after the first 10 hours of operation; replace if threads are stripped or corroded |
10 | TY-10-7A | Baffle plate | Mild steel (Q235) with zinc plating | Corrosion from oil and moisture; bending from impact; zinc plating wear | Keep baffle plates free of oil accumulation; straighten minor bends with pliers; replace if corrosion penetrates the base material |
11 | TY-4-7A3 | Clevis pin with head | Stainless steel (316) for enhanced corrosion resistance | Wear at pin-shaft interface; pitting corrosion from saltwater; head wear from rotational contact | Install retaining rings to prevent axial movement; inspect pin surface for pitting monthly; lubricate with anti-corrosion grease in marine oilfield environments |
12 | TY-11-7A | Adjusting screw | Alloy steel (40Cr) with trapezoidal threads | Thread wear from frequent adjustment; corrosion-induced seizure; debris accumulation in thread grooves | Clean threads with a wire brush before adjustment; apply thread lubricant (graphite-based) quarterly; adjust only within the OEM-specified range to avoid thread damage |
13 | TY-3-7A2 | Sleeve | Brass (H65) | Uniform wear from low-speed rotation; corrosion from humid air; clogging by dust | Keep surrounding areas clean to prevent dust ingress; lubricate with light machine oil; replace if inner diameter tolerance exceeds ±0.1mm |
14 | TY3-7A3 | Sleeve | Bronze (CuAl10Fe3) | Wear from high-load static pressure; deformation from improper installation; oxidation at high temperatures | Ensure correct press-fit during installation (avoid hammering directly); inspect for deformation with a caliper; use in temperatures below 200℃ |
15 | TY-3-7A4 | Sleeve | Brass (H62) | Wear from reciprocating motion; corrosion from oil additives; foreign particle abrasion | Filter lubricating oil to remove particles above 10μm; inspect sleeve surfaces for scratches; replace if wear is visible to the naked eye |
16 | TY-4-7A2 | Clevis pin with head | Stainless steel (304) | Shear fatigue from dynamic loads; corrosion from drilling chemicals; wear at retaining ring grooves | Replace retaining rings whenever pins are removed; inspect grooves for wear; avoid using pins in applications exceeding their rated shear strength (150MPa) |
17 | TY-8-7A | Semicircle retaining ring | Spring steel (65Mn) | Elastic fatigue from repeated installation; deformation from improper tool use; corrosion | Use specialized retaining ring pliers for installation/removal; do not reuse deformed rings; store in a dry, oiled container |
18 | GB5782-86 | Hexagon head bolt M8×16 | Alloy steel (35CrMo) | Thread wear from repeated assembly; vibration-induced loosening; corrosion in coastal oilfields | Apply thread locker (Loctite 243) to prevent loosening; torque to 12-15 N·m; use stainless steel washers in corrosive environments |
19 | GB1152-79 | Grease cup M8×1 | Carbon steel with zinc plating | Thread wear from repeated greasing; clogging of grease channels; corrosion of cup body | Clean the grease nozzle before refueling; use only compatible grease (lithium-based); replace if the cup fails to hold pressure |
20 | TY-12-7A | Spring | Spring steel (50CrVA) with shot peening | Fatigue failure from repeated compression; corrosion; loss of elasticity due to overheating | Inspect spring free length monthly (replace if reduced by more than 5%); avoid exposing to temperatures above 180℃; keep springs clean and dry |
21 | TY-9-7A | Support arm | Alloy steel (Q355B) with welded construction | Weld joint fatigue from vibration; bending from uneven load; corrosion from drilling fluids | Inspect weld joints for cracks using dye penetrant testing annually; reinforce welds if minor cracks are found; apply anti-corrosion primer and topcoat |
22 | GB894.2-86 | Circlip for shaft 75 | Spring steel (65Mn) | Elastic fatigue from heavy axial loads; corrosion; deformation from improper installation | Ensure the circlip groove is clean and free of burrs; use heavy-duty circlip pliers; replace if the circlip does not fit snugly in the groove |
23 | GB894.2-86 | Circlip for shaft 30 | Spring steel (65Mn) | Elastic fatigue from repeated load cycles; corrosion; slot damage from tool use | Handle with care to avoid bending; store in a separate container to prevent scratches; replace if the slot is damaged |
24 | GB93-87 | Washer 10 | Spring steel (65Mn) with zinc plating | Compression set from over-tightening; corrosion; wear from vibration | Select washers matching the bolt diameter; do not stack multiple washers; replace if flattened or corroded |
3. Service Caliper Cylinder Assembly Components
The service caliper cylinder assembly is the hydraulic power core of the service braking system, converting hydraulic pressure into linear piston movement to actuate the brake pads. In oilfield operations, this assembly faces high-pressure conditions (up to 21MPa), hydraulic oil contamination, and temperature fluctuations—all of which can cause oil leakage, piston seizure, and reduced braking responsiveness. Critical failure points include sealing ring aging, piston wear, and hydraulic cylinder corrosion. Using inferior or worn components in this assembly can lead to catastrophic brake failure. The parts listed here feature high-precision machining, chemical-resistant seals, and corrosion-resistant materials to ensure reliable hydraulic actuation and long-term performance.
No. | Part № | Description | Material | Primary Wear Causes | Damage Prevention Precautions |
1 | TY-7-7Ag | Service caliper cylinder assembly | Stainless steel (316L) cylinder body + aluminum alloy (6061-T6) cover | Oil leakage from seal aging; piston seizure due to contamination; cylinder wall wear from abrasive particles | Inspect for oil leakage weekly; change hydraulic oil every 2000 working hours; use a 10μm filter in the hydraulic system; disassemble and inspect internal components annually |
2 | TY-SR-1 | Sealing ring | FKM (Viton) for high temperature and chemical resistance | Aging and hardening at temperatures above 200℃; wear from piston movement; chemical degradation from incompatible hydraulic oil | Replace seals every 12 months regardless of condition; use only OEM-recommended hydraulic oil (ISO VG 46); avoid sharp edges during installation |
3 | GB70-85 | Bolt M10×30 | Alloy steel (40Cr) with internal hex drive | Hex socket wear from improper tools; thread stripping from over-tightening; corrosion in humid environments | Use high-quality hex socket bits; torque to 25-30 N·m; apply anti-seize compound to threads in corrosive environments |
4 | GB93-87 | Washer 12 | Spring steel (65Mn) with zinc plating | Compression set from long-term pressure; corrosion; wear from vibration | Do not reuse washers after disassembly; ensure washers are properly seated before tightening bolts; replace if corroded |
5 | TY-7-7Ag1 | Cover | Aluminum alloy (6061-T6) with anodizing | Anodize layer wear leading to corrosion; sealing surface damage; deformation from over-tightening bolts | Inspect sealing surface for scratches; re-anodize if the surface becomes dull; torque bolts uniformly to avoid deformation |
6 | TY-SR-2 | Sealing ring | NBR (Nitrile rubber) for oil resistance | Swelling from incompatible hydraulic oil; wear from piston sliding; aging in high-temperature environments | Verify hydraulic oil compatibility before use; replace if swelling or cracking is observed; store seals in a cool, dry place away from sunlight |
7 | TY-GB-1 | Guide band L=255 | PTFE (Teflon) with copper powder filling | Wear from piston movement; damage from foreign particles; deformation at high temperatures | Keep the cylinder bore clean; replace if piston movement becomes uneven; avoid temperatures above 260℃ |
8 | TY-SR-7 | Sealing ring | FKM (Viton) | Thermal degradation from continuous braking heat; wear from reciprocating piston; damage from sharp edges in the cylinder | Use plastic or copper tools during installation to avoid seal damage; ensure the cylinder bore is free of burrs; replace after any major braking event |
9 | TY-7-7Ag2 | Piston | Stainless steel (316L) with polished surface | Surface wear from cylinder wall friction; corrosion from hydraulic oil impurities; scratches from foreign particles | Polish surface with fine abrasive paper if minor scratches are present; use a high-precision oil filter; inspect piston diameter monthly with a micrometer |
10 | TY-GB-2 | Guide band L=380 | PTFE (Teflon) with copper powder filling | Wear from long-stroke piston movement; damage from contamination; compression set from high pressure | Replace guide bands whenever the piston is removed; clean the cylinder bore thoroughly before reinstallation; ensure proper lubrication with compatible grease |
11 | TY-SR-6 | Sealing ring | NBR (Nitrile rubber) | Abrasion from foreign particles in hydraulic oil; compression set from long-term pressure; corrosion from moisture | Install a suction filter in the hydraulic tank; relieve system pressure before disassembly; keep the hydraulic system dry to prevent moisture ingress |
12 | TY-7-7Ag3 | Hydraulic cylinder | Stainless steel (316L) with honed inner bore | Inner bore wear from piston movement; corrosion from hydraulic oil; damage from foreign particles | Use only clean, filtered hydraulic oil; honing the inner bore if wear exceeds 0.1mm; inspect for corrosion annually using an endoscope |
13 | TY-7-7Ag4 | Axle sleeve | Bronze (CuSn6) | Wear from axle rotation; seizure due to lack of lubrication; corrosion from moisture | Lubricate with high-pressure grease (NLGI Grade 2); inspect for wear every 6 months; replace if clearance exceeds 0.15mm |
4. Procurement & Technical Reference Standards
To ensure the safety and reliability of your drawworks disc brake system, we recommend adhering to the following procurement and technical standards when selecting and replacing parts:
• Part Compatibility: Always verify the part number and specification against this catalog to ensure compatibility with TY series service calipers. Mismatched parts can cause system failure and void warranty coverage.
• Quality Assurance: Prioritize parts that meet OEM quality standards, including material certifications (e.g., stainless steel 316L, FKM seals) and precision machining tolerances (±0.01mm for critical components).
• Maintenance Documentation: Maintain detailed records of part replacement, including installation date, operating hours, and maintenance activities. This helps in predicting wear and planning preventive maintenance.
• Technical Support: For complex issues (e.g., caliper seizure, hydraulic oil leakage), consult with our technical team to ensure accurate diagnosis and proper part selection.
Procurement Inquiry
If you require replacement parts for your drawworks disc brake service calipers, our team is ready to provide tailored solutions. We offer a comprehensive range of genuine, high-quality parts listed in this catalog, designed to meet the rigorous demands of oilfield operations. Contact our sales team with your specific part numbers and quantity requirements to receive detailed product information and pricing. Our dedicated technical support team is also available to assist with part selection, installation guidance, and troubleshooting to ensure your equipment maintains optimal performance.