Lanzhou LS Drawworks JC70 Mechanical Shifter Installation

1

G404.805

Three-position Cylinder

High-strength alloy steel (45#) cylinder body; stainless steel piston rod; nitriding surface treatment; sealed with high-temperature, oil-resistant fluorine rubber seals; provides three-position power output for precise gear shifting of the drawworks.

1. Piston rod wear and corrosion from hydraulic oil contamination and outdoor exposure; 2. Seal aging and leakage due to long-term high-pressure operation; 3. Internal cylinder wear from hydraulic oil impurities.

1. Replace hydraulic oil every 3 months to avoid contamination; install a high-precision oil filter; 2. Inspect seals monthly for aging/cracks; replace annually or if leakage occurs; 3. Clean the piston rod weekly and apply anti-rust grease to prevent corrosion.

2

G404.804

Three-Position Cylinder

High-strength alloy steel (45#) cylinder body; chrome-plated piston rod for wear resistance; integrated hydraulic control interface; identical in function to G404.805, serving as a redundant or auxiliary component for stable shifting.

1. Cylinder body deformation from high-pressure impact during emergency shifting; 2. Seal damage from improper hydraulic oil viscosity; 3. Piston rod bending from lateral force during installation.

1. Avoid emergency shifting unless necessary to reduce high-pressure impact; 2. Use Lanzhou LS OEM-specified hydraulic oil (ISO VG 46) to protect seals; 3. Ensure vertical installation to prevent lateral force on the piston rod.

3

QF527-00

Two-Position Cylinder

High-strength carbon steel cylinder body; stainless steel piston; low-friction seal design; provides two-position power output for auxiliary gear shifting or locking functions in the shifter system.

1. Seal leakage from drilling fluid contamination; 2. Internal wear from frequent shifting cycles; 3. Cylinder body corrosion from outdoor humidity and saltwater (coastal sites).

1. Clean the cylinder surface daily to remove drilling fluid and debris; 2. Inspect for leakage weekly; replace seals if oil stains are found; 3. Apply anti-corrosion coating every 6 months in coastal environments.

1

106.68.71.00

Main Drive Shaft Connecting rod Assy

High-strength alloy steel (40Cr); precision-forged connecting rod body; heat-treated for fatigue resistance; connects the main drive shaft to the shifter cylinder, transmitting shifting force.

1. Connecting rod pin wear from repeated rotation and vibration; 2. Rod body fatigue cracking from long-term heavy load; 3. Thread wear from improper installation torque.

1. Inspect connecting rod pins monthly for wear; replace if play exceeds 0.2mm; 2. Check for cracks quarterly using magnetic particle inspection; 3. Tighten mounting fasteners to OEM-specified torque.

2

106.40.74.00

Main Drive Shaft Yoke Assy

High-strength steel (Q355B); welded yoke structure; surface anti-corrosion coating; connects the main drive shaft to the connecting rod, accommodating angular displacement during shifting.

1. Weld seam separation from drawworks vibration; 2. Yoke hole wear from pin friction; 3. Deformation from lateral force during shifting.

1. Inspect weld seams monthly for tightness; re-weld if separated; 2. Lubricate yoke holes weekly with lithium-based grease; 3. Avoid overloading the shifter during gear changes.

3

106.40.76.00

Jack Shaft Yoke Assy

High-strength alloy steel (40Cr); precision-machined yoke holes; surface carburizing treatment; connects the jack shaft to the connecting rod, ensuring synchronous power transmission.

1. Yoke surface wear from dust and debris; 2. Hole deformation from over-tightening of pins; 3. Fatigue failure from frequent start-stop shifting.

1. Clean the yoke surface weekly to remove dust; 2. Install pins with proper clearance to avoid hole deformation; 3. Inspect for fatigue cracks quarterly and replace if found.

4

106.68.72.00

Jack Shaft Connecting Rod Assy

High-strength alloy steel (40Cr); forged rod body; precision-threaded ends; connects the jack shaft yoke to the cylinder, transmitting shifting force to the jack shaft.

1. Thread wear from repeated disassembly during maintenance; 2. Rod body bending from improper alignment; 3. Corrosion from hydraulic oil leakage.

1. Use a torque wrench when disassembling/assembling to protect threads; 2. Check alignment monthly and adjust if needed; 3. Repair hydraulic oil leaks immediately to avoid corrosion.

1

106.16.82.00

Housing Assy

High-strength cast iron (HT250); ribbed structure for rigidity; surface anti-corrosion coating; encloses internal shifter components, preventing dust, drilling fluid, and moisture intrusion.

1. Housing cracking from impact during component handling; 2. Corrosion from drilling fluid splashes; 3. Sealing surface wear from repeated cover removal.

1. Use protective padding during handling to avoid impact; 2. Clean the housing surface weekly to remove drilling fluid; 3. Inspect the sealing surface monthly for wear and replace gaskets if needed.

2

106.40.81.00

Housing Assy

High-strength cast iron (HT250); precision-machined internal surface; integrated mounting brackets; identical in function to 106.16.82.00, serving as an auxiliary housing for shifter components.

1. Internal surface wear from rotating components; 2. Housing deformation from long-term drawworks vibration; 3. Corrosion from internal oil leakage.

1. Lubricate internal surfaces monthly to reduce wear; 2. Inspect for deformation quarterly using a straightedge; 3. Repair internal oil leaks promptly to avoid corrosion.

3

106.40.80.00

Shaft Box Assy

High-strength steel (Q355B); welded box structure; surface shot blasting + anti-corrosion coating; houses the jack shaft and connecting components, providing stable support and protection.

1. Weld seam fatigue from vibration; 2. Box deformation from heavy load; 3. Corrosion from outdoor exposure.

1. Inspect weld seams monthly for cracks; 2. Avoid placing heavy tools on the shaft box; 3. Touch up anti-corrosion coating annually or if peeling.

4

106.40.72.00

Support

High-strength structural steel (Q355B); thickened base design; surface anti-corrosion treatment; supports the main drive shaft yoke, reducing vibration and ensuring alignment.

1. Base wear from contact with the drawworks frame; 2. Deformation from lateral force during shifting; 3. Corrosion from moisture accumulation.

1. Inspect the base monthly for wear; replace if excessively worn; 2. Adjust the support position quarterly to ensure alignment; 3. Clean the base weekly to remove moisture and debris.

5

106.40.73.00

Support

High-strength structural steel (Q355B); symmetric design with 106.40.72.00; reinforced rib structure; supports the jack shaft yoke, balancing the load and reducing vibration.

1. Fatigue deformation from long-term vibration; 2. Corrosion from saltwater (coastal sites); 3. Loosening of mounting bolts.

1. Inspect for deformation quarterly; replace if structural integrity is compromised; 2. Increase anti-corrosion inspection frequency in coastal areas; 3. Tighten mounting bolts monthly.

6

106.40.78.00

Support Wheel

High-strength steel wheel body; sealed bearing; surface hard chrome plating; supports the connecting rod during shifting, reducing friction and ensuring smooth movement.

1. Bearing wear from lack of lubrication; 2. Wheel surface wear from friction with the connecting rod; 3. Bearing damage from dust intrusion.

1. Lubricate bearings weekly with high-temperature grease; 2. Inspect wheel surface monthly for wear; replace if uneven; 3. Clean around the support wheel daily to prevent dust accumulation.

1

106.16.70.03

Oil Retainer

Stainless steel (304); precision-stamped; integrated seal design; retains lubricating oil in the housing, preventing leakage and ensuring adequate lubrication of internal components.

1. Seal wear from rotating component friction; 2. Corrosion from hydraulic oil contamination; 3. Deformation from improper installation.

1. Inspect the seal monthly for wear; replace if oil leakage is found; 2. Use clean, OEM-specified hydraulic oil; 3. Install the oil retainer evenly to avoid deformation.

2

QF518-0

Valve

High-strength alloy steel valve body; precision-machined valve core; fluorine rubber seals; controls hydraulic/pneumatic flow to the cylinders, ensuring precise gear shifting timing.

1. Valve core wear from hydraulic oil impurities; 2. Seal leakage from high-pressure operation; 3. Valve blockage from debris accumulation.

1. Replace hydraulic oil regularly and use a high-precision filter; 2. Inspect for leakage weekly; clean or replace the valve if needed; 3. Flush the hydraulic pipeline quarterly to remove debris.

3

106.68.70.03

Nipple

Stainless steel (304); precision-threaded; surface anti-corrosion treatment; connects hydraulic pipelines, ensuring tight sealing and stable oil flow.

1. Thread wear from repeated disassembly; 2. Corrosion from outdoor exposure and drilling fluid; 3. Leakage from improper installation.

1. Use thread sealant during installation to protect threads; 2. Inspect for corrosion monthly; replace if rusted; 3. Tighten evenly to avoid thread damage and leakage.

4

3289.31-82

Plug

High-strength steel (Q235B); surface zinc-plated; threaded design; plugs unused holes in the housing or shaft box, preventing oil leakage and debris intrusion.

1. Thread wear from repeated removal; 2. Corrosion from moisture and drilling fluid; 3. Loosening from drawworks vibration.

1. Replace the plug annually or if threads are worn; 2. Apply anti-rust grease to threads during installation; 3. Check tightness monthly to avoid loosening.

1

106.40.70.02

Fixed Rod

High-strength alloy steel (40Cr); heat-treated for tensile strength; threaded ends; secures the cylinder and support components, ensuring structural stability.

1. Thread wear from over-tightening; 2. Rod body bending from lateral force; 3. Corrosion from outdoor exposure.

1. Use a torque wrench to tighten to OEM specifications; 2. Ensure proper alignment to avoid lateral force; 3. Apply anti-rust grease to threads and rod surface quarterly.

2

GB6173-86

Nut

High-strength steel (8.8 grade); surface zinc-plated; precision-threaded; matches bolts and fixed rods to secure components, preventing loosening from vibration.

1. Thread wear from repeated use; 2. Corrosion from moisture and drilling fluid; 3. Deformation from over-tightening.

1. Replace nuts whenever bolts are replaced; 2. Clean threads before installation; 3. Use lock washers to enhance anti-loosening performance.

3

GB882-86

Pin roll

High-strength steel (45#); surface hardened; precision-machined; connects yokes and connecting rods, transmitting shifting force while accommodating angular displacement.

1. Surface wear from friction with connecting components; 2. Bending from lateral force; 3. Corrosion from lack of lubrication.

1. Lubricate pin rolls weekly with lithium-based grease; 2. Inspect monthly for wear and bending; replace if needed; 3. Ensure proper clearance during installation to avoid excessive friction.

4

GB91-86

Cotter Pin

High-carbon steel; surface zinc-plated; flexible design; secures pins and bolts, preventing accidental detachment during shifter operation.

1. Fatigue breakage from repeated vibration; 2. Corrosion from outdoor humidity; 3. Bending from improper installation.

1. Inspect weekly for breakage or corrosion; replace immediately if damaged; 2. Install cotter pins correctly (bend ends to secure); 3. Store spare cotter pins in a dry area to prevent corrosion.

5

GB97.1-86

Washer

Stainless steel (304); precision-stamped; flat surface; distributes fastener pressure evenly, preventing component surface wear and bolt loosening.

1. Surface wear from fastener pressure; 2. Corrosion from hydraulic oil and drilling fluid; 3. Deformation from over-tightening.

1. Replace washers if they are deformed or worn; 2. Clean washers before installation to remove oil and debris; 3. Use the correct size washer for each fastener.

6

GB5781-86

Bolt

High-strength steel (8.8 grade); surface zinc-plated; full thread design; secures housing, supports, and other components, ensuring structural stability.

1. Thread wear from repeated installation/removal; 2. Fatigue breakage from vibration; 3. Corrosion from outdoor exposure.

1. Tighten bolts to OEM-specified torque; retighten monthly; 2. Replace bolts if threads are stripped or cracks are found; 3. Apply anti-rust thread compound for outdoor use.

7

GB93-87

Washer

High-carbon steel; heat-treated; spring-like structure; provides anti-loosening performance, preventing bolts from loosening due to drawworks vibration.

1. Loss of elasticity from long-term pressure; 2. Corrosion from moisture; 3. Deformation from over-tightening.

1. Replace spring washers annually or if they lose elasticity; 2. Inspect monthly for corrosion; 3. Do not over-tighten bolts to avoid damaging the washer.

1

106.68.70.01

Pipe Clamp Base

High-strength steel (Q235B); stamped forming; surface anti-corrosion coating; mounts to the drawworks frame, securing hydraulic pipelines to prevent movement and damage.

1. Base wear from frame vibration; 2. Corrosion from drilling fluid splashes; 3. Deformation from pipeline pressure.

1. Inspect monthly for wear and deformation; replace if needed; 2. Clean the base weekly to remove drilling fluid; 3. Ensure pipelines are secured tightly but not over-clamped to avoid damage.

2

106.68.70.02

Plate

High-strength steel (Q235B); precision-cut; surface anti-corrosion treatment; serves as a mounting base for shifter components, ensuring alignment and stability.

1. Mounting surface wear from component vibration; 2. Corrosion from outdoor humidity; 3. Bending from impact during maintenance.

1. Inspect mounting surface monthly for wear; grind smooth if uneven; 2. Apply anti-rust grease to the surface quarterly; 3. Use protective padding during maintenance to avoid impact.

3

106.03.79.00

Plate

High-strength steel (Q235B); thickened design; surface anti-corrosion coating; auxiliary mounting plate for shifter components, enhancing structural stability.

1. Fatigue deformation from long-term vibration; 2. Corrosion from drilling fluid; 3. Bolt hole wear from repeated maintenance.

1. Inspect quarterly for deformation; replace if needed; 2. Clean the plate weekly to remove drilling fluid; 3. Tighten mounting bolts evenly to avoid bolt hole wear.

4

106.68.70.04

Plate

High-strength steel (Q235B); precision-machined; surface zinc-plated; mounts the two-position cylinder, ensuring stable power output during shifting.

1. Surface wear from cylinder vibration; 2. Corrosion from saltwater (coastal sites); 3. Deformation from cylinder pressure.

1. Inspect monthly for wear and deformation; 2. Increase anti-corrosion inspection frequency in coastal areas; 3. Ensure the cylinder is mounted evenly to avoid uneven pressure.

5

106.68.70.05

Plate

High-strength steel (Q235B); symmetric design with 106.68.70.04; integrated mounting holes; auxiliary mounting plate for cylinder components, balancing the load.

1. Corrosion from outdoor exposure; 2. Bolt hole wear from repeated installation; 3. Bending from impact.

1. Apply anti-corrosion coating annually; 2. Replace the plate if bolt holes are worn; 3. Avoid impacting the plate with tools during maintenance.

6

106.68.70.06

Plate

High-strength steel (Q235B); lightweight design; surface anti-corrosion treatment; auxiliary mounting plate for hydraulic pipelines, securing them to the shifter assembly.

1. Deformation from pipeline movement; 2. Corrosion from drilling fluid splashes; 3. Edge wear from tool contact.

1. Inspect weekly for pipeline movement and plate deformation; 2. Clean the plate daily to remove drilling fluid; 3. Grind sharp edges if worn to prevent pipeline damage.

7

106.40.70.01

Otic Placode

High-strength alloy steel (40Cr); precision-forged; surface heat treatment; integrated mounting holes; serves as a connecting plate for shifter components, transmitting force and ensuring alignment.

1. Hole wear from pin friction; 2. Fatigue cracking from long-term force transmission; 3. Corrosion from outdoor exposure.

1. Lubricate mounting holes weekly with lithium-based grease; 2. Inspect quarterly for cracks using magnetic particle inspection; 3. Apply anti-rust coating annually to prevent corrosion.

1

Are these parts compatible only with the Lanzhou LS Drawworks JC70, and how to confirm the correct part model during procurement?

All parts are exclusively matched to the Lanzhou LS Drawworks JC70 Mechanical Shifter and cannot be used for other drawworks models. To confirm the correct model, use the original product model provided in this guide (e.g., G404.805 Three-position Cylinder). If unsure, provide the component name and installation position to our technical team for verification—using incorrect parts causes shifting failure and safety hazards.

2

What is the key maintenance focus to avoid common shifter faults (e.g., jamming, oil leakage)?

Key maintenance focuses on lubrication, sealing, and fastener tightness: 1. Lubricate bearings (support wheel, yoke holes) weekly; 2. Inspect seals (cylinders, oil retainer) monthly for leakage and replace aging parts; 3. Tighten fasteners monthly to avoid loosening from vibration; 4. Replace hydraulic oil every 3 months to prevent contamination; 5. Clean components daily to remove drilling fluid and debris.

3

When replacing fasteners (e.g., GB5781-86 Bolt, GB6173-86 Nut), why must we follow GB standards and use genuine parts?

Fasteners complying with GB standards (e.g., GB5781-86, GB6173-86) meet the high-strength requirements of API Spec 7K for drilling equipment. Genuine parts ensure precise thread size and material quality, preventing: 1. Bolt breakage from insufficient strength; 2. Nut loosening leading to component misalignment; 3. Thread wear and oil leakage. Non-genuine fasteners increase fault risks and downtime.