Core Application & Target User Requirements
This spare parts list is specifically tailored for the Drawworks Disc Brake system, with full compatibility for key components such as the PSZ75B-70D-B series actuating mechanism, TY-00-7B service calipers, and TY-0-7A emergency calipers. It is designed to address the critical needs of professional users including drilling rig maintenance teams, drawworks equipment after-sales engineers, and oilfield operation managers—particularly the demand for accurate, high-reliability spare parts to prevent brake system failures, avoid unplanned downtime of drawworks operations, and ensure the safety and efficiency of drilling hoisting work. All listed parts strictly match the original equipment's technical parameters and installation dimensions, providing a reliable replacement solution for daily maintenance and emergency repairs.
1. Mounting & Fastening Components
Mounting and fastening components are the foundational structural parts of the drawworks disc brake system, responsible for securing the caliper, actuating mechanism, and other core components to ensure stable operation under high-load and high-vibration drilling conditions. These parts are prone to loosening, thread wear, or deformation due to long-term vibration, improper torque application during installation, and corrosion from harsh oilfield environments—problems that directly lead to brake component misalignment and reduced braking efficiency. The parts in this category adopt high-strength materials and precise processing to ensure reliable fastening performance.
Sn | Part № | Description | Material | Main Wear Reasons | Precautions to Avoid Damage |
1 | PSZ75B-70D-B-01-04 | Upper mounting base | High-strength carbon steel (galvanized) | Fatigue deformation from long-term load-bearing; corrosion from oilfield moisture and salt spray; wear at connection surfaces due to vibration | Inspect for deformation and corrosion regularly; use gaskets to reduce vibration impact during installation; perform anti-corrosion painting every 6 months in harsh environments |
2 | PSZ75B-70D-B-03 | Hexagon head bolt | Alloy steel (heat-treated) | Thread wear from improper torque during assembly/disassembly; loosening and abrasion due to continuous vibration; shear failure from overloading | Use a torque wrench to ensure accurate tightening torque; apply anti-loosening thread locker; check and retighten regularly during maintenance |
3 | PSZ75-1-04 | Slotted countersunk head screw | Stainless steel 304 | Slot damage from mismatched screwdrivers; thread stripping from over-tightening; corrosion in humid environments | Use matching slotted screwdrivers; avoid excessive force during installation; apply anti-rust oil to threads for long-term storage |
4 | GB6179-86 | Hexagon slotted and castle nut | Alloy steel | Slotted wear from split pin insertion/removal; thread loosening due to vibration; corrosion leading to seizing | Ensure split pins are properly installed to prevent loosening; clean threads before assembly; replace if slots are deformed |
5 | GB91-86 | Split pin | Spring steel | Bending fatigue from repeated disassembly; corrosion weakening material strength; shear damage from excessive vibration | Do not reuse split pins after removal; install with appropriate bending angle to ensure locking effect; store in dry environment |
2. Caliper & Frame Components
Caliper and frame components are core functional parts of the drawworks disc brake system, responsible for clamping the friction disc to generate braking force. These parts bear large mechanical loads and friction during braking, making them prone to wear, deformation, or cracking—issues that directly affect braking performance and even lead to safety hazards. The parts in this category are manufactured with high-precision casting and machining processes to ensure structural strength and braking stability.
Sn | Part № | Description | Material | Main Wear Reasons | Precautions to Avoid Damage |
1 | PSZ75B-70D-B-01-00 | Caliper frame | Ductile iron (QT450-10) | Fatigue cracking from repeated braking impact; wear at guide rails due to caliper sliding; corrosion from oil and moisture | Regularly inspect for cracks using magnetic particle testing; lubricate guide rails with high-temperature resistant grease; avoid sudden heavy braking |
2 | TY-00-7B | Service calipers | Ductile iron + stainless steel components | Piston seal wear leading to oil leakage; guide pin jamming and wear; deformation from uneven braking force | Check hydraulic oil cleanliness regularly to prevent seal damage; clean and lubricate guide pins every maintenance cycle; ensure uniform braking force distribution |
3 | TY-0-7B | Emergency calipers | Ductile iron + alloy steel | Mechanical wear from infrequent use (emergency activation); spring fatigue; corrosion in unused state | Perform test activation monthly to prevent component seizing; inspect spring elasticity regularly; keep caliper surfaces clean and dry |
4 | PSZ75B-70D-B-01-01 | Lower mounting base | High-strength carbon steel (galvanized) | Impact deformation from drawworks operation vibration; corrosion from ground moisture; wear at connection points | Install shock-absorbing pads between the base and frame; elevate the base to avoid direct contact with water; tighten fasteners regularly |
5 | - | Drum | Alloy steel (heat-treated) | Surface wear from friction with brake pads; thermal deformation from high-temperature braking; cracking from rapid cooling | Avoid overheating during continuous braking; allow natural cooling after heavy braking; grind the surface when wear exceeds the limit |
3. Friction & Sealing Components
Friction and sealing components are critical for ensuring braking efficiency and hydraulic system tightness of the drawworks disc brake. Friction components generate braking force through friction, while sealing components prevent hydraulic oil leakage—both are prone to rapid wear, aging, or damage due to high temperature, friction, and oil corrosion. The parts in this category use high-temperature resistant, wear-resistant materials to extend service life and ensure system reliability.
Sn | Part № | Description | Material | Main Wear Reasons | Precautions to Avoid Damage |
1 | PSZ75B-70D-B-04-00 | Friction disc | Semi-metallic friction material + steel core | Abrasive wear from continuous braking; thermal fading and cracking at high temperatures; oil contamination reducing friction performance | Monitor wear thickness regularly (replace when below 3mm); avoid oil contamination on the friction surface; control braking frequency to prevent overheating |
2 | TY-1-7A | Brake pad | Ceramic friction material + steel backing | Friction wear during braking; bonding failure between friction material and steel backing at high temperatures; edge chipping from impact | Replace in pairs to ensure uniform wear; avoid sudden heavy braking; inspect bonding integrity regularly |
3 | TY-SR-1 | Sealing ring | FKM (Viton) | Aging and hardening from high temperature; wear from piston movement; chemical corrosion from hydraulic oil impurities | Use high-quality hydraulic oil that meets specifications; replace every 12 months or when oil leakage is found; avoid sharp edges during installation |
4 | TY-SR-2 | Sealing ring | FKM (Viton) | Compression deformation from over-installation; wear from lateral movement; aging from long-term storage | Ensure correct installation groove size; avoid over-compressing the seal; store in a cool, dry environment away from sunlight |
5 | TY-SR-3 | Sealing ring | NBR (Nitrile rubber) | Oil swelling from incompatible hydraulic oil; wear from piston sliding; aging in high-temperature environments | Verify hydraulic oil compatibility before use; clean the piston surface before installation; replace if swelling or cracking is found |
6 | TY-SR-4 | Sealing ring | NBR (Nitrile rubber) | Abrasion from foreign particles in the hydraulic system; compression set from long-term pressure; corrosion from moisture | Install a high-precision oil filter; relieve system pressure before disassembly; keep the hydraulic system dry |
7 | TY-SR-5 | Sealing ring | FKM (Viton) | Thermal degradation from continuous braking heat; wear from piston reciprocation; damage from improper installation tools | Use plastic or copper tools for installation; ensure adequate cooling of the cylinder assembly; replace after heavy braking incidents |
8 | TY-GB-1 | Guide band | PTFE + copper powder | Wear from piston sliding; damage from foreign particles; deformation at high temperatures | Keep the cylinder bore clean; lubricate with compatible grease; replace if piston movement becomes rough |
4. Emergency Caliper Transmission & Auxiliary Components
Emergency caliper transmission and auxiliary components are responsible for transmitting the actuating force of the emergency braking system, ensuring that the emergency caliper can be quickly and reliably activated when needed. These parts are prone to wear, seizing, or fatigue failure due to infrequent use, vibration, and corrosion—problems that may render the emergency braking system ineffective. The parts in this category are designed with anti-seizing and anti-fatigue features to ensure emergency reliability.
Sn | Part № | Description | Material | Main Wear Reasons | Precautions to Avoid Damage |
1 | TY-2-7A | Steel backing | High-strength steel | Deformation from brake pad pressure; corrosion; wear at connection points with caliper | Inspect for flatness regularly; replace if deformed; apply anti-corrosion treatment to the surface |
2 | TY-3-7A | Sleeve | Brass | Wear from pin rotation; corrosion from moisture; deformation from improper installation | Lubricate with anti-corrosion grease during installation; avoid over-pressing during assembly; inspect for wear regularly |
3 | TY-4-7A | Clevis pin with head | Stainless steel 304 | Shear wear from force transmission; corrosion; wear at the head due to rotation | Ensure proper alignment during installation to avoid lateral force; lubricate regularly; replace if there is visible wear on the shear surface |
4 | TY-3-7A1 | Sleeve | Bronze | Wear from high-load rotation; seizure due to lack of lubrication; corrosion from oilfield environment | Use high-temperature resistant lubricant; inspect for seizure signs monthly; clean and re-lubricate during maintenance |
5 | TY-5-7A | Lever | Alloy steel (forged) | Fatigue bending from repeated force application; wear at hinge points; corrosion | Inspect for bending and cracks regularly; lubricate hinge points; avoid applying excessive force beyond the rated load |
6 | TY-6-7A | Cover plate | Carbon steel (painted) | Corrosion from moisture and dust; deformation from impact; paint peeling leading to further corrosion | Keep the surface clean; touch up paint when peeling; ensure tight installation to prevent dust and water ingress |
7 | GB68-85 | Slotted countersunk head screw M6×12 | Stainless steel 304 | Slot damage from improper tools; thread wear from repeated disassembly; corrosion | Use precision slotted screwdrivers; avoid over-tightening; apply anti-rust treatment for outdoor use |
8 | TY-4-7A1 | Clevis pin with head | Stainless steel 304 | Wear at the pin-shaft interface; corrosion; head deformation from impact | Install with retaining rings to prevent axial movement; inspect for wear monthly; replace if the head is deformed |
9 | TY-3-7A2 | Sleeve | Brass | Wear from low-speed rotation; corrosion from humid environment; clogging by dust | Keep the surrounding area clean; lubricate with light grease; replace if rotation is blocked |
10 | GB894.2-86 | Circlip for shaft 35 | Spring steel | Elastic fatigue from repeated installation/removal; corrosion; deformation from improper tool use | Use special circlip pliers for installation/removal; do not reuse deformed circlips; store in dry environment |
11 | GB1152-79 | Grease cup M8×1 | Carbon steel (zinc-plated) | Thread wear from repeated greasing; corrosion; clogging of grease channels | Clean the grease nozzle before greasing; apply anti-rust oil to threads; replace if clogging cannot be cleared |
12 | TY-3-7A3 | Sleeve | Bronze | Wear from high-pressure force transmission; deformation from improper installation; corrosion | Ensure correct fit with matching components; avoid overloading; lubricate with pressure-resistant grease |
13 | TY-3-7A4 | Sleeve | Brass | Uniform wear from rotation; corrosion from oil and moisture; wear from foreign particles | Filter grease before use; clean the sleeve bore regularly; replace if wear exceeds 0.2mm |
14 | TY-4-7A2 | Clevis pin | Stainless steel 316 | Shear wear from dynamic load; corrosion in saltwater environments; wear at the pin surface | Inspect shear strength regularly; use in corrosive environments with anti-corrosion coating; replace in pairs if worn |
15 | TY-8-7A | Semicircle retaining ring | Spring steel | Deformation from installation pressure; corrosion; wear at the contact surface | Install in the correct groove size; avoid excessive force during installation; replace if deformation is found |
16 | GB5782-86 | Hexagon head bolt M10×16 | Alloy steel | Thread wear from repeated disassembly; loosening due to vibration; corrosion | Use torque wrench for precise tightening; apply anti-loosening washer; inspect and retighten quarterly |
17 | GB894.2-86 | Circlip for shaft 85 | Spring steel | Elastic fatigue from heavy load; corrosion; deformation from improper installation | Use heavy-duty circlip pliers; ensure the shaft diameter matches the circlip size; replace if elasticity is reduced |
18 | TY-9-7A | Support arm | Alloy steel (welded) | Weld joint fatigue from vibration; deformation from load-bearing; corrosion | Inspect weld joints for cracks regularly; avoid overloading; perform anti-corrosion treatment on welds |
19 | TY-10-7A | Baffle plate | Carbon steel (painted) | Corrosion from dust and moisture; deformation from impact; paint peeling | Keep the baffle clean; repair paint damage promptly; install securely to avoid vibration |
20 | GB93-87 | Washer 10 | Spring steel (galvanized) | Compression deformation from over-tightening; corrosion; wear from vibration | Select the correct washer size; avoid over-compressing; replace if flattened or corroded |
5. Emergency Caliper Cylinder Assembly Components
Emergency caliper cylinder assembly components are the core of the hydraulic drive system for emergency braking, responsible for converting hydraulic pressure into mechanical force to activate the caliper. These parts operate in high-pressure and high-temperature environments, making them prone to wear, oil leakage, or mechanical failure—issues that directly affect the responsiveness and reliability of emergency braking. The parts in this category are manufactured with high-precision machining and strict quality control to ensure hydraulic system stability.
Sn | Part № | Description | Material | Main Wear Reasons | Precautions to Avoid Damage |
1 | GB70-85 | Socket cap head screw M12×30 | Alloy steel (heat-treated) | Hex socket wear from improper tools; thread wear from over-tightening; corrosion | Use high-quality hex socket wrenches; apply torque according to specifications; apply anti-rust oil to threads |
2 | GB93-87 | Washer 12 | Spring steel (galvanized) | Compression set from long-term pressure; corrosion; wear from vibration | Do not reuse washers after disassembly; select washers matching the bolt size; replace if corroded |
3 | TY-7-7A1 | Cover of the cylinder | Aluminum alloy (anodized) | Sealing surface wear; corrosion from hydraulic oil impurities; deformation from over-tightening screws | Clean the sealing surface before installation; torque screws uniformly; replace seals when installing |
4 | TY-7-7A2 | Piston | Stainless steel 316 | Surface wear from cylinder wall friction; corrosion from hydraulic oil; scratches from foreign particles | Keep hydraulic oil clean; inspect the cylinder bore for scratches; apply wear-resistant coating if necessary |
5 | TY-7-7A3 | Elastic guide sleeve | Rubber + fiber reinforcement | Aging and hardening from high temperature; wear from piston movement; deformation from pressure | Replace every 12-18 months; avoid high-temperature environments; ensure proper lubrication |
6 | TY-7-7A4 | Disc spring | Spring steel (heat-treated) | Fatigue deformation from repeated compression; corrosion; surface wear from contact | Inspect elasticity regularly; replace springs in sets to ensure uniform force; store in dry environment |
7 | TY-7-7A5 | Copper bush | Copper-lead alloy | Wear from sliding friction; seizure due to lack of lubrication; corrosion from moisture | Lubricate with high-pressure grease; inspect for wear regularly; replace if clearance exceeds 0.15mm |
8 | TY-7-7A6 | Hydraulic cylinder | Stainless steel 316 | Inner wall wear from piston movement; corrosion from hydraulic oil; damage from foreign particles | Use high-precision filters in the hydraulic system; avoid over-pressurization; honing the inner wall when wear is excessive |
9 | TY-7-7A7 | Lock nut | Alloy steel | Thread wear from adjustment; loosening due to vibration; corrosion | Apply thread locker after adjustment; check tightness regularly; use a torque wrench for adjustment |
10 | TY-7-7A8 | Axle sleeve | Brass | Wear from axle rotation; corrosion; deformation from improper installation | Ensure proper fit with the axle; lubricate regularly; replace if excessive play is found |
11 | TY-7-7A9 | Retaining ring | Spring steel | Deformation from installation; corrosion; elastic fatigue | Use proper installation tools; avoid over-stretching; replace if deformation occurs |
12 | TY-7-7A10 | Adjusting nut | Alloy steel | Thread wear from frequent adjustment; corrosion; deformation from excessive force | Adjust within the rated range; clean threads before adjustment; apply anti-rust lubricant |
13 | TY-7-7A11 | Back cover of the cylinder | Aluminum alloy (anodized) | Sealing surface wear; corrosion from moisture; deformation from screw tightening | Torque screws evenly; replace seals periodically; keep the back cover clean and dry |
14 | GB1152-79 | Grease cup M8×1 | Carbon steel (zinc-plated) | Thread wear; corrosion; grease channel clogging | Grease regularly (every 3 months); clean the nozzle before greasing; replace if damaged |
15 | GB93-87 | Washer 8 | Spring steel (galvanized) | Compression deformation; corrosion; wear from vibration | Use the correct washer size; avoid over-tightening; replace if corroded or flattened |
16 | GB70-85 | Socket cap head screw M8×30 | Alloy steel | Hex socket wear; thread wear; corrosion | Use matching hex socket tools; apply torque correctly; inspect threads before installation |
Procurement Guide
All spare parts listed in this document are manufactured in strict accordance with the original technical standards of drawworks disc brake systems, ensuring 100% compatibility and reliable performance. For drilling rig operations, the reliability of brake system spare parts is directly related to operational safety and efficiency. Choosing high-quality, perfectly matched spare parts can effectively reduce maintenance costs and avoid potential safety risks. We provide professional pre-sales technical consultation to help you accurately confirm the required part