Core Purpose Description
This document focuses on the parts list of BOMCO JC-70DB (including JC-70DB7) drawworks, exclusively compatible with this specific model. It is tailored for oilfield drilling enterprises, professional drilling rig maintenance service providers, and oilfield equipment rental companies. The parts address pain points such as equipment shutdown, low drilling efficiency, and safety risks caused by harsh oilfield environments (high vibration, dust, alternating temperature), long-term high-load operation, and component wear/failure. All parts comply with API Spec 7K "Drilling and Well Servicing Equipment" and GB/T 23505-2009 "Drilling Rig Drawworks" standards, ensuring the stable, efficient, and safe operation of JC-70DB drawworks, and providing authoritative technical support for daily maintenance and fault repair.
1. Core Main Body Components
This category includes the drawworks frame, hoods, and positioning parts, which form the basic structure of the JC-70DB drawworks. They solve pain points of structural deformation, component damage, and dust intrusion caused by high vibration and impact during drilling. Suitable for the overall structural maintenance and protection of JC-70DB drawworks.
No. | Product Name | Model/ Drawing No. | Material | Main Wear Causes | Damage Prevention Precautions |
1 | Drawworks Frame | AF700308-0200 | Q355B carbon steel (integral welding + stress relief heat treatment); Surface: shot blasting + anti-corrosion painting | 1. Welding seam fatigue cracking caused by long-term high vibration during drilling; 2. Local deformation caused by uneven ground installation and impact load | 1. Regularly inspect welding seams with non-destructive testing (NDT) every 6 months, and repair cracks in time; 2. Calibrate the installation levelness (allowable deviation ≤ 0.2mm/m) before use, and pad shock-absorbing cushions under the frame |
2 | Hoods (Left/Front/Right/Tooth Profile/Shaft End/Hydrosphere Control Units) | AF700303-2500 (Left Hood), AF700303-2200 (Front Hood), AF700303-2700 (Right Hood), AF700303-0800/0600 (Tooth Profile Hood), AF700304-1300 (Shaft End Hood), AF700303-1600 (Hydrosphere Control Units Hood) | HT250 gray cast iron (normalized); Surface: anti-corrosion painting; Fastening parts: 45# carbon steel | 1. Crack damage caused by collision during transportation and operation; 2. Sealing failure and dust intrusion caused by aging of connecting gaskets | 1. Avoid collision during transportation and installation, and install protective baffles if necessary; 2. Replace the connecting gaskets every 12 months, and apply sealant at the joint to enhance sealing performance |
3 | Positioning Parts (Positioned Block/V Positioned Block IV/Connecting Block/Support Block/Gusset Plate) | AF700303-2300 (Positioned Block), T107-004.00 (V Positioned Block IV), AF700303-31 (Connecting Block 40X40), AF700303-35 (Support Block), AF700303-33 (Gusset Plate) | 45# carbon steel (quenched and tempered); Surface: precision machining | 1. Wear of positioning surface caused by long-term friction and vibration; 2. Loosening and displacement caused by insufficient fastening of connecting bolts | 1. Regularly check the positioning surface wear (allowable wear ≤ 0.1mm), and grind and repair if excessive; 2. Tighten the connecting bolts with a torque wrench (specified torque: 35-40N·m) and apply Loctite 243 lock glue |
4 | Flashbords (Left/Right) | AF700303-26 (Left Flashbord), AF700303-28 (Right Flashbord) | Q235B carbon steel; Surface: galvanizing + anti-corrosion painting | 1. Corrosion and rust caused by long-term exposure to humid and corrosive oilfield environment; 2. Deformation caused by impact of gravel and other debris | 1. Regularly clean the surface and repaint anti-corrosion paint every 12 months; 2. Install protective nets around the flashbords to prevent debris impact |
5 | Transition Fit Seat & Connect Steel Plate | AF700303-30 (Transition Fit Seat), AF700303-29 (Connect Steel Plate) | 40Cr alloy steel (quenched and tempered); Transition Fit Seat: precision grinding | 1. Wear of fit surface caused by long-term assembly and disassembly; 2. Fatigue damage caused by alternating load | 1. Apply lubricating grease on the fit surface during assembly to reduce friction; 2. Check the surface for fatigue cracks regularly, and replace if found |
2. Key Functional System Components
This category covers core functional systems such as the drum shaft assembly, hydraulic disc brake system, lubrication system, and pneumatic control system, which are crucial for the lifting and braking functions of the drawworks. They solve pain points of functional failure, low transmission efficiency, and braking unreliability caused by component wear and system contamination. Suitable for the maintenance and upgrading of JC-70DB drawworks key systems.
No. | Product Name | Model/ Drawing No. | Material | Main Wear Causes | Damage Prevention Precautions |
1 | Drum Shaft Assembly | AF700308-0400 | Drum Shaft: 42CrNiMo alloy steel (integral forging + quenched and tempered); Connecting Parts: 40Cr alloy steel; Bearings: GCr15 bearing steel | 1. Shaft surface wear and pitting caused by insufficient lubrication and long-term alternating load; 2. Bearing damage caused by dust intrusion and high-temperature operation | 1. Use API-specified industrial gear oil (ISO VG 460), and check the oil level regularly (maintain at 1/2-2/3 of the oil window); 2. Replace the air filter of the gearbox every 800 operating hours, and clean the bearing chamber every 6 months |
2 | Hydraulic Disc Brake System | PS702401-00 | Brake Disc: 20CrMnTi alloy steel (surface quenching); Brake Caliper: HT300 gray cast iron; Sealing Parts: fluororubber; Hydraulic Components: 304 stainless steel | 1. Brake disc wear and thermal deformation caused by frequent braking; 2. Hydraulic system leakage caused by sealing ring aging and high pressure | 1. Check the brake disc wear regularly (allowable wear ≤ 3mm), and grind the surface if uneven; 2. Replace the sealing ring every 12 months, and use hydraulic oil that meets the specification (NAS 7 level) |
3 | Lubrication System & Greasing Lube Oil System | AF700308-0900 (Lubrication System), AF700303-1800 (Greasing Lube Oil System) | Oil Pump: 45# carbon steel (rotor) + cast iron (stator); Oil Pipes: 304 stainless steel; Filters: glass fiber filter element + 304 stainless steel housing | 1. Oil pump wear and failure caused by oil contamination; 2. Pipeline blockage and leakage caused by long-term use and vibration | 1. Replace the oil filter element every 500 operating hours, and test the oil cleanliness regularly; 2. Fix the oil pipeline with anti-vibration pipe clamps, and check the pipeline joints for leakage every 7 days |
4 | Pneumatic Control System | AF700309-0200 | Valves: aluminum alloy (anodized); Air Cylinders: 304 stainless steel (cylinder tube) + aluminum alloy (piston); Sealing Rings: nitrile rubber | 1. Valve core jamming caused by dust and moisture in the compressed air; 2. Air cylinder leakage caused by seal ring wear | 1. Install an air filter and dryer in the air circuit to ensure air cleanliness (ISO 8573-1 Class 4-4-3); 2. Replace the seal ring of the air cylinder every 10 months, and apply lubricating grease to the piston rod regularly |
5 | Automatic Feed Driller & Its Clutch Hood | AF700307-0800 (Automatic Feed Driller), AF700303-1700 (Automatic Feed Driller’ Clutch Hood) | Automatic Feed Driller: Aluminum alloy (housing) + 40Cr alloy steel (transmission parts); Clutch Hood: HT250 gray cast iron | 1. Transmission part wear caused by long-term high-speed operation; 2. Clutch hood damage caused by dust intrusion and collision | 1. Check the transmission gap regularly (allowable gap ≤ 0.15mm), and adjust if excessive; 2. Keep the clutch hood sealed, and clean the internal dust every 3 months |
6 | Drum Gear Coupling (I/II) | WG05115201 (Drum Gear Coupling I), WG05115001 (Drum Gear Coupling II) | Gear: 20CrMnTi alloy steel (carburized and quenched); Hub: 42CrMo alloy steel; Sealing Ring: nitrile rubber | 1. Gear tooth wear and pitting caused by misalignment and insufficient lubrication; 2. Sealing failure caused by seal ring aging | 1. Align the coupling with a laser alignment instrument (alignment accuracy ≤ 0.01mm); 2. Inject lubricating grease (NLGI 2) every 15 days, and replace the seal ring every 12 months |
7 | Left/Right Transmission Gear Case | WG00707007 (Left Transmission Gear Case), WG00707006 (Right Transmission Gear Case) | Housing: HT300 gray cast iron; Gears: 20CrMnTi alloy steel; Shafts: 42CrMo alloy steel | 1. Gear wear caused by impure lubricating oil; 2. Housing deformation caused by high temperature and uneven load | 1. Use high-purity gear oil, and replace the oil every 1500 operating hours; 2. Monitor the housing temperature regularly (allowable temperature ≤ 75℃), and install a cooling fin if necessary |
8 | Motor | GEBPPAXGEBP2B | Stator: Copper wire + silicon steel sheet; Rotor: 45# carbon steel; Housing: Aluminum alloy | 1. Stator winding burnout caused by voltage fluctuation and overload; 2. Bearing damage caused by insufficient lubrication | 1. Install a voltage stabilizer and overload protector, and avoid starting with load; 2. Inject lithium-based grease into the bearing every 2000 operating hours, and check the bearing temperature regularly |
9 | Guide Roller & Rope Clips | T105-001.00 (Guide Roller), T100-006.00 (Rope clips 438) | Guide Roller: 45# carbon steel (roller) + GCr15 bearing steel (bearing); Rope Clips: 45# carbon steel (body) + 40Cr alloy steel (bolt) | 1. Guide roller wear caused by long-term friction with drilling rope; 2. Rope clip deformation caused by excessive clamping force | 1. Ensure the drilling rope is properly lubricated, and check the guide roller wear every 30 days; 2. Control the clamping torque of the rope clip according to the specification (40-45N·m), avoid over-tightening |
3. Connecting & Fastening Components
This category includes bolts, nuts, washers, pin shafts, and adjusting cushions, which provide reliable connection and fastening functions for various components of the drawworks. They solve pain points of component loosening, displacement, and functional failure caused by vibration and alternating load. Suitable for the overall maintenance and spare part replacement of JC-70DB drawworks.
No. | Product Name | Model/ Part No. | Material | Main Wear Causes | Damage Prevention Precautions |
1 | Bolts | M36X160 (AF700303-37), M36X120 (AF700303-19), M36X125 (AF700303-12), M12X40 (420201010712040000), M10X30 (420101020710003000), M16X40 (420201061116040000), M12X25 (420201010712025000) | M36/M16: 42CrMo alloy steel (heat treatment); M12/M10: 40Cr alloy steel (heat treatment); Thread: precision rolling | 1. Thread wear caused by repeated disassembly and assembly; 2. Bolt fatigue and fracture caused by long-term vibration | 1. Apply anti-rust lubricating oil on the thread during installation, and use a torque wrench to control the tightening force; 2. Check the bolt tightness every 7 days, and replace bolts with signs of fatigue |
2 | Nuts & Grip Nut | M12 (420402016120400000), M36 (420402016360400000/420402026360400000), Grip Nut M36 (420421016360400000), Elynut M12 (420405016120200000) | M36: 45# carbon steel (heat treatment); M12: 40Cr alloy steel (heat treatment); Surface: galvanizing | 1. Thread loosening caused by vibration; 2. Corrosion caused by humid and dusty environment | 1. Use spring washers and Loctite 243 lock glue to enhance anti-loosening performance; 2. Paint the nut surface with anti-corrosion paint, and avoid direct contact with drilling fluid |
3 | Washers (Spring/Plain) | Spring Washer 12 (420503016121600000), Plain Washer 12 (420501016120300000), Spring Washer 16 (420503016161600000) | Spring Washer: 65Mn steel (heat treatment); Plain Washer: Q235B carbon steel (galvanizing) | 1. Spring washer fatigue and loss of elasticity caused by long-term compression; 2. Plain washer corrosion and deformation caused by humid environment | 1. Replace the spring washer every 6 months, and check the elasticity regularly; 2. Select galvanized washers for humid environments, and clean the contact surface before installation |
4 | Pin Shaft | AF700303-32 (Pin Shaft 410X32) | 40Cr alloy steel (quenched and tempered); Surface: chrome plating | 1. Surface wear caused by long-term rotation and friction; 2. Bending deformation caused by impact load | 1. Apply lubricating grease on the surface regularly to reduce friction; 2. Check the straightness of the pin shaft every 3 months (allowable runout ≤ 0.03mm), and replace if deformed |
5 | Adjusting Cushions | AF500301-0600, AF500301-1200, AF700303-0700 (Transmission Adjusting Cushion) | Rubber: nitrile rubber (high elasticity); Metal Frame: Q235B carbon steel | 1. Rubber aging and hardening caused by high temperature and long-term compression; 2. Metal frame corrosion caused by humid environment | 1. Control the operating temperature ≤ 80℃, and avoid long-term over-compression; 2. Check the rubber condition every 6 months, and replace if cracks or hardening occur |
Field Fault Maintenance Case
Case: BOMCO JC-70DB Drawworks Drum Shaft Assembly Bearing Damage
Fault Phenomenon: During on-site drilling operation, the JC-70DB drawworks had abnormal sharp noise in the drum area, and the bearing end temperature rose rapidly to 98℃ (normal temperature ≤ 75℃) within 15 minutes of operation. The drilling operation was forced to stop to avoid further damage to the drum shaft assembly.
Inspection Process: 1. Safety Preparation: Stop the drawworks and related power systems immediately, set up warning signs around the maintenance area, and wait for the bearing to cool down naturally (avoid direct cooling with water to prevent thermal deformation); 2. Preliminary Inspection: Use an infrared thermometer to confirm the temperature of each part of the drum shaft assembly, and use a stethoscope to locate the abnormal noise source at the bearing position; 3. Disassembly Inspection: Remove the drum end hood and bearing end cover in sequence with special tools, and find that the bearing (matching AF700308-0400 drum shaft assembly) has obvious wear, the rolling elements are pitted and peeled, and the inner and outer rings have wear marks; 4. Lubricating Oil Inspection: Extract the lubricating oil from the gearbox, observe that the oil is turbid and contains metal particles, and test the oil cleanliness to reach NAS 10 level (exceeding the standard requirement of NAS 7 level); 5. Auxiliary Component Inspection: Check the lubrication system filter element and gearbox air filter, and find that the filter element is severely blocked by impurities, and the air filter shell is cracked, resulting in loss of dust filtration function.
Root Cause Analysis: 1. The lubrication system filter element was not replaced according to the maintenance cycle (500 operating hours), resulting in continuous accumulation of impurities in the lubricating oil, which caused abrasive wear to the bearing; 2. The gearbox air filter was damaged and not found in time, making external dust enter the gearbox and mix with the lubricating oil, further aggravating the bearing wear; 3. Long-term operation of the bearing under contaminated lubricating oil conditions led to increased friction, which caused the bearing temperature to rise sharply and produce abnormal noise.
Complete Solution: 1. Safety Protection: Maintenance personnel wear professional protective equipment (high-temperature resistant gloves, goggles, anti-skid shoes) to prevent scalding and mechanical injury during operation; 2. Disassembly of Damaged Components: a) Use a bearing puller to remove the worn bearing from the drum shaft, and avoid damaging the drum shaft surface during disassembly; b) Remove the lubrication system filter element and gearbox air filter for replacement; c) Disconnect the lubrication pipeline connected to the drum shaft assembly, and plug the pipeline port with a clean plug to prevent impurities from entering; 3. Cleaning Treatment: a) Clean the drum shaft surface with diesel oil, polish the bearing installation position with fine sandpaper (ensure surface roughness Ra ≤ 0.8μm), and dry it with compressed air; b) Clean the gearbox inner cavity and bearing chamber with clean diesel oil, remove residual impurities and old lubricating oil, and dry thoroughly; c) Flush the lubrication pipeline with new lubricating oil (API-specified industrial gear oil ISO VG 460) to remove internal blockages and impurities; 4. Component Replacement: a) Install a new bearing (matching AF700308-0400 drum shaft assembly) on the drum shaft, apply a thin layer of lubricating grease on the bearing inner ring and installation surface before installation to reduce assembly resistance; b) Replace with a new lubrication system filter element (matching AF700308-0900 lubrication system) and a new gearbox air filter; c) Reconnect the lubrication pipeline, and use a torque wrench to tighten the pipeline joints according to the specified torque (20-25N·m) to ensure no leakage; 5. Lubricating Oil Replacement: a) Drain all old lubricating oil in the gearbox; b) Inject new API-specified industrial gear oil (ISO VG 460) into the gearbox to the specified oil level (1/2-2/3 of the oil window); 6. Assembly & Debugging: a) Install the bearing end cover and drum end hood in sequence, and tighten the fastening bolts with a torque wrench (specified torque: 30-35N·m); b) Start the drawworks for no-load operation, monitor the bearing temperature and noise in real time: the bearing temperature should rise steadily and not exceed 70℃ within 30 minutes of operation, and there should be no abnormal noise; c) Conduct load test: gradually apply the rated load to the drawworks, test the bearing temperature (stable at 65-70℃) and braking performance, and confirm that all indicators are normal; 7. Post-Maintenance Inspection: a) Check the lubrication system oil pressure (ensure it is within the range of 0.3-0.5MPa) and oil level, and confirm that the lubrication pipeline is unblocked; b) Check the gearbox air filter for tight installation and good sealing; c) Operate the drawworks continuously for 2 hours, and monitor the bearing temperature, noise and lubricating oil condition in real time to ensure stable operation; 5. Preventive Maintenance Plan: a) Formulate a fixed maintenance cycle: replace the lubrication system filter element every 500 operating hours, replace the gearbox air filter every 800 operating hours, and replace the gearbox lubricating oil every 1500 operating hours; b) Daily inspection: Check the gearbox air filter for damage and blockage every 7 days, check the lubrication system oil level and oil pressure every shift, and record the data; c) Oil quality monitoring: Test the lubricating oil cleanliness every 3 months, and replace the lubricating oil in advance if the cleanliness exceeds NAS 7 level; d) Training: Strengthen the training of maintenance personnel on the standard operation of component replacement and maintenance cycle management to ensure that maintenance work is carried out in accordance with specifications.
Maintenance Effect: After maintenance, the JC-70DB drawworks operated normally, the bearing temperature remained stable at 65-70℃ during both no-load and load operation, and there was no abnormal noise. The lubrication system operated smoothly, and the oil pressure and oil level were normal. The drawworks continued to operate stably for 4 months without similar faults, ensuring the continuity and safety of drilling operations.
Procurement Guide & Call to Action
All parts listed in this document are exclusively for BOMCO JC-70DB (including JC-70DB7) drawworks, complying with API Spec 7K and GB/T 23505-2009 standards, with genuine quality and complete certification. When purchasing, please confirm the product's model, drawing number, and part number to ensure accurate matching with the equipment. Our professional technical team provides one-on-one technical consultation services, covering product selection, on-site installation guidance, fault diagnosis, and maintenance training. For detailed product parameters, material performance reports, API certification documents, and procurement quotes, please contact us at your convenience. We are committed to providing you with high-quality, genuine BOMCO JC-70DB drawworks parts and professional after-sales support, ensuring the efficient, stable, and safe operation of your drilling equipment.
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