Rear Mechanical Jack Assembly & Related Parts for ZJ40

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Z02080000002AA

Rear mechanical jack assembly

High-strength alloy steel (40CrNiMoA), with quenched and tempered heat treatment

1. Long-term bearing of excessive loads exceeding the rated capacity; 2. Corrosion caused by long-term exposure to rain, mud, or chemical drilling fluids; 3. Fatigue wear of internal mechanical structures due to frequent lifting operations.

1. Strictly follow the rated load (not exceeding 120% of the rated value) during use; 2. Clean the surface with neutral detergent after construction and apply anti-rust grease; 3. Conduct weekly inspection of internal gears and lubrication status, add lubricating oil in time.

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Z02070000001AA

Rear mechanical jack assembly

High-strength alloy steel (40CrNiMoA), with quenched and tempered heat treatment

1. Uneven force during lifting, leading to local stress concentration and deformation; 2. Lack of regular lubrication, causing dry friction between internal components; 3. Impact damage caused by sudden lifting or lowering.

1. Ensure the jack is placed on a flat and hard surface before use to avoid uneven force; 2. Lubricate internal transmission components every 50 working hours with lithium-based grease; 3. Operate the jack at a uniform speed, avoiding sudden start or stop.

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Z02080100002AA

Pad

High-density rubber (NBR) with steel plate core, shore hardness 65-70°

1. Abrasion caused by long-term contact with rough ground or sharp objects; 2. Aging and cracking due to exposure to high temperature, ultraviolet rays, or chemical corrosion; 3. Excessive pressure leading to permanent deformation.

1. Place a flat steel plate under the pad when using on soft or rough ground; 2. Store in a cool and dry place away from direct sunlight and chemical agents when not in use; 3. Check the pad’s surface for cracks or deformation before each use, replace if damaged.

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P9100064AA

Chain(d=φ5.6,23 knots)

High-strength carbon steel (20Mn2), with galvanized anti-rust treatment and quenched surface

1. Wear and tear between chain links due to lack of lubrication; 2. Stretching or breaking caused by overloading beyond the chain’s tensile strength; 3. Corrosion and rust caused by contact with water, mud, or saltwater (for offshore drilling).

1. Apply chain lubricant every 30 working hours to reduce friction between links; 2. Never use the chain to lift loads exceeding its rated tensile capacity (≥800kg); 3. Rinse with fresh water and dry thoroughly after use in rainy or offshore environments, then apply anti-rust oil.

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P2000106AA

Pin

Alloy steel (35CrMoA), with carburizing and quenching treatment, surface hardness HRC 58-62

1. Shear damage caused by uneven force or excessive torque during assembly; 2. Wear of the pin surface due to long-term rotation or vibration; 3. Corrosion caused by insufficient anti-rust protection in humid environments.

1. Use a torque wrench to tighten the pin according to the specified torque (25-30N·m) during assembly; 2. Check the pin’s surface for wear or scratches regularly, replace if the wear depth exceeds 0.5mm; 3. Apply anti-rust grease to the pin before installation and after maintenance.

2

P2000107AA

Pin

Alloy steel (35CrMoA), with carburizing and quenching treatment, surface hardness HRC 58-62

1. Fatigue fracture caused by frequent vibration during rig operation; 2. Damage caused by improper disassembly (using brute force to pull out the pin); 3. Pitting corrosion on the surface due to contact with acidic drilling fluids.

1. Install a shock-absorbing gasket near the pin to reduce vibration impact; 2. Use a proper tool (pin puller) for disassembly, avoid brute force; 3. Clean the pin with alkaline detergent after contact with acidic fluids, then dry and apply anti-rust oil.

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Z02070000002AA

Supporting seat

Cast alloy steel (ZG35CrMo), with annealing heat treatment to eliminate internal stress

1. Crack formation due to uneven load distribution during jack operation; 2. Wear of the connecting hole caused by long-term friction with the pin; 3. Corrosion and rust caused by long-term exposure to outdoor harsh environments.

1. Ensure the supporting seat is firmly fixed to the rig body before using the jack; 2. Check the connecting hole’s inner diameter regularly, replace if the wear exceeds 1mm; 3. Paint the surface with anti-rust paint annually, touch up paint in areas with paint peeling.

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P9860033AA

Circlip, safety pin

Circlip: Spring steel (65Mn); Safety pin: Carbon steel (Q235) with zinc plating

1. Elastic fatigue of the circlip due to frequent disassembly and assembly; 2. Rust and corrosion of the safety pin caused by humid environments; 3. Deformation or breakage of the safety pin due to improper use (bending with brute force).

1. Replace the circlip every 10 times of disassembly and assembly to avoid elastic failure; 2. Check the safety pin for rust regularly, replace if rust is severe; 3. Do not bend the safety pin arbitrarily, use the correct tool to insert and remove it.

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Can the rear mechanical jack assembly (Z02080000002AA) be used for other rig models besides ZJ40?

No. This jack assembly is specifically designed for ZJ40 drilling rigs, with dimensions, load-bearing capacity, and connection interfaces matching only ZJ40 models. Using it on other rigs may cause safety hazards and equipment damage.

2

How often should the chain (P9100064AA) be lubricated to avoid wear?

It is recommended to apply chain lubricant every 30 working hours. For harsh environments (rainy, offshore, or dusty), shorten the lubrication interval to 20 working hours to reduce friction between chain links and prevent premature wear.

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What is the main difference between the two pin models (P2000106AA and P2000107AA)?

The two pins have the same material and hardness but different dimensions (length and diameter), which are used for connecting different components of the jack assembly. P2000106AA is used for chain connection, while P2000107AA is used for supporting seat connection—do not mix them during assembly.