Lanzhou Drawworks JC70 Wireline Turnback Assembly

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106.02.170.00

Wireline Turnback Assy

1. Structural loosening from long-term vibration during wireline operation; 2. Component wear (roller, bearing) from contaminated lubricant; 3. Deformation from impact during on-site handling or wireline jamming.

1. Inspect overall assembly for loosening, deformation, and wear quarterly; 2. Lubricate moving components (roller, bearing) every 300 working hours; 3. Avoid sudden wireline tension changes to prevent impact damage.

Integrated assembly with high-strength steel structural parts; pre-installed with all matching components (roller, shaft, bearings); fully compatible with Lanzhou Drawworks JC70 drawworks; meets oilfield equipment structural strength standards.

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106.02.171.00

Bracked

1. Fatigue cracking from long-term load-bearing and vibration; 2. Corrosion from drilling mud, salt spray, and environmental moisture; 3. Wear at connection points from repeated assembly/disassembly.

1. Inspect for cracks and deformation monthly; 2. Apply anti-corrosion paint annually to vulnerable areas; 3. Tighten connection fasteners regularly to reduce stress concentration.

Q355B low-alloy steel; one-piece forging structure; precision-machined connection surfaces; designed to support the entire wireline turnback assembly and bear wireline tension.

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106.02.172.00

Roller Assembly

1. Roller surface wear from long-term wireline friction; 2. Bearing damage inside the roller from insufficient lubrication; 3. Deformation from wireline jamming or excessive tension.

1. Inspect roller surface for wear monthly (replace if wear exceeds 0.3mm); 2. Inject lubricant through the grease fitting every 200 working hours; 3. Avoid wireline jamming by monitoring wireline tension during operation.

High-carbon steel (45#) roller body; GCr15 bearing inside; surface hardened (HRC 55-60) for wear resistance; designed to guide wireline movement and reduce wireline friction.

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106.02.170.02

Shaft

1. Wear at bearing connection points from long-term rotation; 2. Fatigue deformation from continuous vibration and wireline tension; 3. Corrosion from lubricant impurities and environmental moisture.

1. Inspect shaft straightness quarterly (replace if deviation exceeds 0.1mm); 2. Lubricate bearing connection points during each maintenance cycle; 3. Clean the shaft surface regularly to remove debris and prevent corrosion.

40Cr alloy steel; heat-treated for high toughness and rigidity; precision-ground surface; complies with GB/T 3077-2015; designed to support the roller assembly and transmit rotational force.

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1207

Bearin cover

1. Wear from bearing rotation; 2. Deformation from over-tightening fasteners; 3. Corrosion from oil leakage and environmental moisture.

1. Tighten fasteners evenly with a torque wrench to avoid deformation; 2. Check for oil leaks regularly and replace the seal if needed; 3. Clean the cover surface to prevent debris buildup.

Q235B carbon steel; surface galvanized for anti-corrosion; precision-machined sealing surface; designed to protect the internal bearing from contaminants and retain lubricant.

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106.02.160.07

Bearing Cover

1. Wear at the bearing contact edge; 2. Seal damage from improper installation; 3. Corrosion from drilling mud and moisture infiltration.

1. Install evenly to avoid uneven pressure on the bearing and seal; 2. Replace the seal when disassembling the cover; 3. Apply anti-corrosion grease to the connection surface before reinstallation.

45# carbon steel; heat-treated for strength; precision-machined contact surface; compatible with the roller assembly bearing; ensures bearing stability and prevents lubricant leakage.

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106.02.170.03

Bearing Box Cover

1. Wear from long-term contact with the bearing box; 2. Deformation from impact during maintenance; 3. Corrosion from oil contamination and environmental moisture.

1. Handle carefully during disassembly/installation to avoid impact damage; 2. Inspect for deformation and wear during each maintenance cycle; 3. Clean and apply anti-corrosion paint regularly.

Q235B carbon steel; zinc-plated surface; precision-machined to fit the bearing box; designed to protect the bearing box and internal components from contaminants.

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E4-7.2.00

Grease Fitting Assembly

1. Clogging from lubricant impurities and drilling debris; 2. Thread wear from repeated lubricant injection; 3. Corrosion from environmental moisture and drilling mud.

1. Clean the fitting before injecting lubricant to avoid clogging; 2. Inject lubricant slowly to prevent pressure buildup; 3. Apply anti-corrosion grease to threads monthly to prevent seizing.

H62 brass; precision-tapped metric threads; one-way valve design to prevent lubricant backflow; compatible with lithium-based and molybdenum disulfide grease.

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D3-1-67

Felt Seal

1. Wear and degradation from long-term contact with moving components; 2. Saturation and hardening from contaminated lubricant; 3. Damage from improper installation (forced fitting).

1. Replace every 400 working hours or if hardened/saturated; 2. Install carefully to avoid tearing the felt; 3. Clean the seal groove before installation to remove debris.

High-density industrial felt; oil-absorbent and dust-proof; heat-resistant up to 100℃; designed to seal bearing boxes and prevent debris from entering internal components.

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106.02.160.08

Rataining Rine

1. Wear from contact with bearings and other components; 2. Deformation from improper installation or removal; 3. Corrosion from lubricant impurities and moisture.

1. Use proper tools for installation/removal to avoid deformation; 2. Inspect for wear and cracks during each maintenance cycle; 3. Replace if the retaining ring no longer fits tightly.

65Mn spring steel; heat-treated for elasticity and strength; precision-machined to fit bearing grooves; designed to fix bearings in place and prevent axial movement.

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GB30-66

Bolt

1. Thread wear from repeated assembly/disassembly; 2. Fatigue fracture from continuous vibration; 3. Corrosion from oilfield contaminants and moisture.

1. Tighten to specified torque (varies by installation position) with a torque wrench; 2. Apply anti-corrosion grease to threads before installation; 3. Replace after 3-5 disassembly cycles to avoid fatigue failure.

8.8-grade carbon steel; zinc plating for anti-corrosion; complies with GB30-66 standard; precision-threaded; used for securing brackets, covers, and other key components.

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GB30-66

Bolt

1. Thread deformation from over-tightening; 2. Wear from contact with washers and components; 3. Corrosion from drilling mud and moisture infiltration.

1. Avoid over-tightening to prevent thread deformation; 2. Use matching washers to distribute pressure; 3. Clean threads before installation to remove debris and prevent cross-threading.

8.8-grade carbon steel; same material and standard as the above GB30-66 bolt; consistent size and performance; ensures compatibility and interchangeability for maintenance.

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GB90-66

Washer

1. Wear from bolt pressure and vibration; 2. Deformation from over-tightening; 3. Corrosion from oil and environmental moisture.

1. Use with matching GB30-66 bolts to ensure proper fit; 2. Replace after each disassembly to maintain flatness; 3. Avoid using damaged washers that could cause uneven pressure.

Q235B carbon steel; galvanized surface for anti-corrosion; complies with GB90-66 standard; precision-machined to ensure flatness; distributes bolt pressure to protect components.

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106.02.170.01

Washer

1. Abrasive wear from contact with moving components; 2. Corrosion from lubricant and environmental moisture; 3. Deformation from excessive pressure.

1. Inspect for wear and deformation during each maintenance cycle; 2. Replace if the surface is worn or corroded; 3. Ensure proper alignment during installation to avoid uneven pressure.

45# carbon steel; surface hardened for wear resistance; precision-machined to fit the shaft and roller assembly; designed to reduce friction and protect component surfaces.

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GB97-66

Washer

1. Wear from long-term bolt pressure; 2. Corrosion from oilfield contaminants; 3. Damage from improper installation (reverse fitting).

1. Install with the smooth side towards the component surface; 2. Replace if rusted, deformed, or worn; 3. Use only with matching bolts to ensure optimal performance.

Q235B carbon steel; zinc-plated surface; complies with GB97-66 standard; thin and flat design; used for securing small components and reducing surface wear.

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GB93-66

Washer

1. Fatigue failure from continuous vibration; 2. Deformation from over-tightening; 3. Corrosion from moisture and oil.

1. Replace after each disassembly to maintain elasticity; 2. Use with matching bolts to ensure proper locking; 3. Avoid over-compression during installation to prevent breakage.

65Mn spring steel; complies with GB93-66 standard; heat-treated for elasticity; designed to prevent bolts from loosening due to vibration during operation.

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GB52-66

Nut

1. Thread wear from repeated assembly/disassembly; 2. Corrosion from oil and environmental moisture; 3. Loosening-induced wear from vibration.

1. Tighten with a torque wrench to match the corresponding bolt; 2. Apply anti-corrosion grease to threads; 3. Inspect for looseness monthly and retighten if needed.

8.8-grade carbon steel; zinc plating for anti-corrosion; complies with GB52-66 standard; precision-threaded; perfectly matched with GB30-66 bolts for secure locking.

What type of lubricant should I use for the JC70 wireline turnback assembly?

For roller assemblies and bearings, use high-temperature lithium-based grease (NLGI Grade 2) or molybdenum disulfide grease, which resists wear and high temperature (up to 120℃). Inject lubricant through the grease fitting assembly (E4-7.2.00) every 200 working hours, and replace old lubricant every 500 working hours to ensure optimal performance—complying with industry lubrication standards.

How do I detect early signs of component failure in the wireline turnback assembly?

Early warning signs include abnormal noise (grinding, squeaking) from the roller or bearing, wireline wear (uneven surface), oil leakage around covers/seals, and loose components. Additionally, increased wireline tension or jamming during operation may indicate roller or shaft damage. Stop operation immediately to inspect and avoid further damage.

Are these components interchangeable with other drawworks models, or are they exclusive to Lanzhou JC70?

All components listed are exclusively designed and manufactured for Lanzhou Drawworks JC70. They are not interchangeable with other drawworks models, as dimensions, structural design, and load-bearing capacity are tailored to JC70’s wireline turnback system. Using non-matching components will cause jamming, wireline damage, and potential safety hazards—always use parts with the original part numbers listed.