Core Application & Target User Demand
This document covers spare parts for the Automatic Feed Driller Shaft Assembly and Automatic Feed Driller of BOMCO Drawworks models, including JC-90, JC-70, JC-50, JC-40, JC-90DB, JC-70DB, JC-50DB, JC-40DB, JC-90D, JC-70D, and JC-5. Tailored for oil & gas drilling operation teams, professional drilling equipment maintenance providers, and mining machinery spare part buyers, these parts are core to ensuring precise automatic feeding, stable power transmission, and reliable operation of drawworks. They address the key demands for dimensionally accurate, standard-compliant spare parts and professional technical support to minimize downtime and ensure drilling safety.
Automatic Feed Driller Shaft Assembly Components
As the core power transmission unit of the automatic feed system, the shaft assembly components bear continuous torque and radial loads in harsh drilling environments. Wear, oil leakage, or component misalignment here can cause feed inaccuracy or shaft jamming, directly disrupting drilling efficiency. These precision-manufactured parts ensure optimal fit and durability, critical for maintaining consistent feed performance.
Gears & Key Transmission Components
Gears and keys are essential for torque transmission in the shaft assembly. In high-speed rotation and heavy-load conditions, they are prone to tooth wear and shear damage, leading to power loss. These components adopt hardened alloy materials and precision grinding, ensuring high wear resistance and torque-bearing capacity.
No. | Part Number & Name | Material | Main Wear Reasons | Damage Prevention Notes |
1 | ZCYQC850-9.4A-305a Gear | Alloy structural steel (20CrMnTi), carburizing and quenching (hardness HRC 58-62) | 1. Abrasive wear on tooth surfaces due to contaminated lubricating oil with metal particles; 2. Fatigue pitting of teeth caused by long-term alternating loads | 1. Replace lubricating oil per BOMCO maintenance standard Q/BOMCO 003-2023 and use filters complying with GB/T 25984-2010; 2. Monitor gear meshing noise (allowable ≤ 85dB) to detect abnormal wear early |
2 | ZCYQC790-8.2-316 Key | Medium carbon steel (45#), quenched and tempered (hardness HRC 35-40) | 1. Shear deformation caused by excessive torque during sudden load changes; 2. Wear of keyway due to repeated assembly/disassembly and vibration | 1. Avoid emergency start-stop of drawworks to prevent torque spikes; 2. Ensure keyway fit clearance is within 0.01-0.03mm (per GB/T 1095-2003) during installation |
Shaft Assembly Sealing & Oil Retention Components
Sealing and oil retention components prevent lubricating oil leakage and dust intrusion in the shaft assembly. In dusty, humid drilling sites, aging or damage can lead to oil loss and component corrosion. These parts use oil-resistant, wear-resistant materials to ensure long-term sealing reliability.
No. | Part Number & Name | Material | Main Wear Reasons | Damage Prevention Notes |
1 | 40X2.65/GB3452.1-82 O-ring | Nitrile rubber (NBR 70), oil-resistant and temperature-resistant (-20℃ to 120℃) | 1. Aging and cracking caused by long-term contact with high-temperature lubricating oil; 2. Cutting damage from burrs on sealing grooves during installation | 1. Store O-rings in cool, dry environment (0-25℃) to avoid premature aging; 2. Polish sealing grooves to Ra ≤ 0.8μm and remove burrs before assembly |
2 | ZLYQC850-9.4A-302 Oil Retainer | Stainless steel (304) with anti-corrosion coating | 1. Deformation caused by uneven pressure during installation; 2. Corrosion of oil passage due to moisture intrusion | 1. Tighten fixing bolts evenly in cross pattern (torque 25-30N·m); 2. Regularly drain condensation from gear case (every 200 working hours) to prevent moisture buildup |
3 | ZLYQC850-9.4A-300 Oil Retainer | Stainless steel (304) with anti-corrosion coating | 1. Wear of sealing edge due to relative rotation with shaft; 2. Clogging of oil holes by sludge from aging lubricating oil | 1. Apply a thin layer of compatible lubricating grease on sealing edge; 2. Replace lubricating oil before sludge formation (per maintenance schedule) |
4 | ZLYQC850-9.4A-335 Oil Retainer | Stainless steel (304) with anti-corrosion coating | 1. Impact damage during on-site transportation/installation; 2. Fatigue cracking due to long-term vibration | 1. Use shock-absorbing packaging during transportation; 2. Check for vibration-induced cracks with magnetic particle inspection every 1500 working hours |
Shaft Assembly Structural Plates & Spacers
Structural plates and spacers ensure positional accuracy of components in the shaft assembly. In high-vibration drilling environments, deformation or wear can cause component misalignment, leading to increased friction and reduced efficiency. These precision-machined parts maintain dimensional stability under load.
No. | Part Number & Name | Material | Main Wear Reasons | Damage Prevention Notes |
1 | ZLYQC790-8.2-330 Lower Plate | High-strength cast steel (ZG310-570), normalized heat treatment | 1. Wear of mating surface due to long-term vibration; 2. Bending deformation caused by uneven load distribution | 1. Check flatness of mating surface regularly (allowable deviation ≤ 0.05mm/m); 2. Ensure even load distribution by following assembly torque specifications |
2 | ZLYQC830-9.4A-303 Partition Sleeve | Alloy steel (40Cr), quenched and tempered | 1. Abrasive wear due to contaminated lubricating oil; 2. Deformation caused by excessive interference during installation | 1. Maintain lubricating oil cleanliness (particle count ≤ 16/13 per ISO 4406); 2. Control interference fit within 0.02-0.05mm (per GB/T 1184-1996) |
3 | ZLYQC790-8.2-314 Plate | Medium carbon steel (45#), quenched and tempered | 1. Corrosion caused by humid on-site environment; 2. Thread wear of fixing holes due to repeated assembly | 1. Apply anti-corrosion paint to exposed surfaces; 2. Use thread repair inserts for worn holes to avoid over-tightening |
4 | ZLYQL790-8.2-318 Plate | Medium carbon steel (45#), quenched and tempered | 1. Fatigue cracking at bolt holes due to cyclic vibration; 2. Warpage caused by thermal shock during maintenance | 1. Use spring washers to absorb vibration and reduce stress concentration; 2. Avoid sudden heating/cooling during maintenance (temperature change ≤ 5℃/min) |
5 | ZLYQL790-8.2-317 Plate | Medium carbon steel (45#), quenched and tempered | 1. Edge wear due to contact with moving components; 2. Deformation caused by improper storage (stacking pressure) | 1. Check for contact wear with dial gauge during maintenance; 2. Store plates flat, avoiding stacking weights on top |
6 | ZLYQL790-8.2-313 Partition Sleeve | Alloy steel (40Cr), quenched and tempered | 1. Wear of inner diameter due to shaft rotation; 2. Corrosion caused by water intrusion into the assembly | 1. Ensure adequate lubrication between sleeve and shaft; 2. Inspect sealing system regularly to prevent water ingress |
Shaft Assembly Fasteners
Fasteners secure components in the shaft assembly, and their reliability is critical for preventing component separation in high-vibration environments. Loosening or fatigue failure of fasteners can lead to catastrophic assembly damage. These fasteners comply with national standards and are designed for anti-loosening and fatigue resistance.
No. | Part Number & Name | Material | Main Wear Reasons | Damage Prevention Notes |
1 | M16X50/GB/T32.1 Bolt | Alloy steel (8.8 grade), galvanized for corrosion resistance | 1. Loosening caused by resonant vibration during drilling; 2. Tensile fatigue failure due to over-tightening | 1. Use thread locking adhesive (complying with GB/T 14074-2017) for critical positions; 2. Tighten to specified torque (85-95N·m) with calibrated torque wrench |
2 | M16X50/GB/T32.1 Bolt (Duplicate) | Alloy steel (8.8 grade), galvanized for corrosion resistance | 1. Corrosion of thread in humid/dusty environment; 2. Thread damage caused by foreign particles during assembly | 1. Clean threads thoroughly before installation; 2. Apply anti-corrosion grease to threads in harsh environments |
Shaft Assembly Bearings
Bearings ensure smooth rotation of the shaft assembly, bearing radial and axial loads. In high-speed, heavy-load drilling conditions, insufficient lubrication or contamination can cause bearing overheating and seizure. These high-precision bearings are designed for high load capacity and long service life.
No. | Part Number & Name | Material | Main Wear Reasons | Damage Prevention Notes |
1 | 22334LA/W33 Bearing | Bearing steel (GCr15), heat-treated; cage: brass | 1. Rolling element wear due to insufficient lubrication; 2. Raceway damage caused by metal particles in lubricating oil | 1. Fill with high-temperature grease (complying with GB/T 7324-2019) before installation; 2. Use lubricating oil filters with 10μm precision |
2 | NU2336M Bearing | Bearing steel (GCr15), heat-treated; cage: steel | 1. Overheating and seizure due to improper preload; 2. Corrosion caused by water intrusion | 1. Set preload according to bearing manufacturer's specifications; 2. Ensure sealing system integrity to prevent water ingress |
Automatic Feed Driller Components
Automatic Feed Driller components control the feeding speed and stability of the drawworks, directly affecting drilling precision and efficiency. In continuous drilling operations, hydraulic system leaks, clutch wear, or pipeline damage can cause feed failure. These components are engineered for high reliability and compatibility with BOMCO JC series drawworks.
Hydraulic Joints & Pipeline Components
Hydraulic joints and pipelines transmit hydraulic power for the automatic feed system. Leaks or blockages here can lead to insufficient feed pressure and unstable operation. These components adopt precision machining and high-pressure-resistant materials, ensuring reliable hydraulic transmission.
No. | Part Number & Name | Material | Main Wear Reasons | Damage Prevention Notes |
1 | AF7003031501 Joint NPT1/2-M27X1.5 | Carbon steel (20#), nickel-plated for corrosion resistance | 1. Thread wear due to repeated assembly/disassembly; 2. Leakage caused by improper thread sealing | 1. Use thread sealant complying with GB/T 14074-2017; 2. Avoid over-tightening (torque 45-55N·m) to prevent thread damage |
2 | AF7003031502 Joint NPT1/2-M27X1.5 | Carbon steel (20#), nickel-plated for corrosion resistance | 1. Corrosion of external surface in humid drilling environment; 2. Impact damage during on-site operation | 1. Inspect surface plating regularly and touch up if damaged; 2. Install protective sleeves in high-impact areas |
3 | AF700303150300 Pipe Clip Assembly | Steel strip (Q235A) + rubber pad (NBR) | 1. Rubber pad aging due to high temperature; 2. Steel strip deformation caused by excessive clamping force | 1. Replace rubber pad every 1200 working hours; 2. Adjust clamping force to avoid pipeline deformation |
4 | AF500209-0405 Hose | Inner tube: NBR; Reinforcement: steel wire; Outer cover: CR | 1. Fatigue cracking of outer cover due to repeated bending; 2. Inner tube damage caused by hydraulic oil contamination | 1. Ensure minimum bending radius ≥ 8×hose diameter; 2. Filter hydraulic oil (particle count ≤ 19/16 per ISO 4406) regularly |
5 | 530801190200024001 O-ring 20X2.4 | Fluoro rubber (FKM), high-temperature and chemical-resistant | 1. Compression set caused by long-term static load; 2. Damage caused by incompatible hydraulic oil additives | 1. Control compression ratio within 25-30% of cross-sectional diameter; 2. Verify hydraulic oil additive compatibility with FKM before use |
Automatic Feed Driller Electrical & Transmission Components
Electrical and transmission components control the operation of the automatic feed driller. Terminal damage or clutch wear can cause signal failure or feed speed inconsistency. These components are manufactured to strict electrical and mechanical standards, ensuring stable performance.
No. | Part Number & Name | Material | Main Wear Reasons | Damage Prevention Notes |
1 | AF5003011301 Terminal Block | Insulator: PA66; Conductive part: copper alloy, tin-plated | 1. Contact resistance increase due to dust accumulation; 2. Insulator aging caused by high temperature | 1. Clean terminals with dry air every 300 working hours; 2. Ensure operating temperature ≤ 85℃ (per GB/T 14048.1-2012) |
2 | T104-026.00 Clutch (ATDB27) | Friction plate: asbestos-free friction material; Hub: steel (40Cr) | 1. Friction plate wear due to frequent engagement/disengagement; 2. Spring fatigue caused by cyclic load | 1. Minimize unnecessary clutch engagement; 2. Check friction plate thickness regularly (minimum ≥ 3mm) |
3 | WG01627015 Reducing Mechanism | Gears: 20CrMnTi; Housing: cast iron (HT250) | 1. Gear wear due to insufficient lubrication; 2. Housing deformation caused by external impact | 1. Maintain lubricating oil level per sight glass; 2. Install protective guard around the mechanism |
On-Site Fault Maintenance Case
Case 1: Automatic Feed Driller Shaft Jamming Caused by Bearing Seizure
Fault Phenomenon: During operation of BOMCO JC-70 drawworks, the automatic feed function failed suddenly, and the shaft assembly of the feed driller was jammed. The equipment alarm was triggered, and the motor current exceeded the rated value.
Fault Diagnosis: After shutting down and disassembling the shaft assembly, maintenance personnel found that the NU2336M bearing was severely seized, with obvious blueing (thermal damage) on the raceway. Further inspection revealed that the lubricating oil was contaminated with metal particles, and the oil filter was clogged, leading to insufficient lubrication of the bearing.
Maintenance Process: 1. Replace the seized NU2336M bearing and contaminated lubricating oil; 2. Clean the shaft assembly and oil circuit thoroughly to remove metal particles; 3. Replace the oil filter with a new one complying with GB/T 25984-2010; 4. Apply the specified preload to the new bearing and reassemble the shaft assembly; 5. Test run the equipment, confirming that the shaft rotates smoothly and the feed function is restored.
Preventive Measures: 1. Shorten the lubricating oil replacement cycle from 2000 to 1500 working hours for harsh drilling environments; 2. Install a pressure gauge on the oil circuit to monitor lubrication pressure (allowable range: 0.2-0.4MPa); 3. Conduct monthly magnetic particle inspection on key bearings to detect early wear.
Case 2: Hydraulic Leakage of Automatic Feed Driller Caused by O-Ring Damage
Fault Phenomenon: During drilling operation of BOMCO JC-90 drawworks, the maintenance team noticed hydraulic oil leakage at the joint of the automatic feed driller's hose (AF500209-0405). The feed speed became unstable, and the drilling precision was affected.
Fault Diagnosis: Disassembly inspection showed that the O-ring (530801190200024001) at the hose joint was damaged, with obvious cuts on the surface. The cuts were caused by burrs on the joint's sealing groove during previous maintenance.
Maintenance Process: 1. Replace the damaged O-ring with a new FKM O-ring; 2. Polish the sealing groove of the joint to remove burrs, ensuring surface roughness Ra ≤ 0.8μm; 3. Apply compatible thread sealant and assemble the joint, tightening to the specified torque (45-55N·m); 4. Conduct a pressure test (test pressure: 1.5×working pressure) to confirm no leakage; 5. Restore the feed driller to operation, with stable feed speed and no further leakage.
Preventive Measures: 1. Require maintenance personnel to inspect and polish sealing grooves before assembly; 2. Provide special training on O-ring installation techniques, emphasizing the use of proper tools to avoid damage; 3. Stock spare O-rings on-site for quick replacement.
Procurement Guide & Technical Support
All parts listed in this document are fully compatible with BOMCO Drawworks JC series models (JC-90, JC-70, JC-50, JC-40, JC-90DB, JC-70DB, JC-50DB, JC-40DB, JC-90D, JC-70D, JC-5) and comply with national and industry standards such as GB/T 32.1-2000, GB/T 3452.1-82, and Q/BOMCO 003-2023. Choosing these high-quality, standard-compliant parts ensures the long-term stable operation of your automatic feed system, reduces maintenance costs, and guarantees drilling efficiency and safety.
We provide comprehensive technical support for all purchased parts, including professional installation guidance, on-site fault diagnosis, and customized maintenance solutions. If you need to purchase any of the parts mentioned in this document, please contact our sales team. Our team will provide you with reliable product supply and professional technical services to meet your drilling equipment operation and maintenance needs.
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