Steering Power Assisting Cylinder & Matching Parts for ZJ40 Drilling Rig

1

Z02030900002AA

Steering power assisting cylinder

High-precision seamless steel pipe (20Mn2) cylinder body; chrome-plated alloy steel (40Cr) piston rod; high-pressure resistant nitrile rubber seals; integrated hydraulic control structure complying with GB/T 10054-2017

1. Piston rod wear/scratches from debris or sharp objects in harsh drilling environments; 2. Seal aging and oil leakage due to high hydraulic pressure and temperature fluctuations; 3. Cylinder body corrosion from long-term outdoor exposure to rain and mud.

1. Install a dust cover to protect the piston rod from debris when not in use; 2. Use clean, grade-compatible hydraulic oil and replace it every 6 months; 3. Clean the cylinder surface regularly and reapply anti-rust coating if peeling occurs.

1

Z02030901001AA

Cylinder body

High-precision seamless alloy steel pipe (20Mn2); heat-treated for toughness and pressure resistance (rated pressure ≥25MPa); internal honing treatment for smoothness; surface epoxy anti-rust coating

1. Internal wall wear due to contaminated hydraulic oil with metal particles; 2. External corrosion from long-term outdoor exposure; 3. Cracking due to excessive hydraulic pressure beyond the rated limit.

1. Install a hydraulic oil filter to prevent metal particles from entering the cylinder; 2. Never exceed the rated hydraulic pressure (25MPa) during operation; 3. Store the rig in a covered area when not in use to avoid direct exposure to rain.

2

P0700003AA

Piston cylinder

Alloy steel (35CrMoA); carburized and quenched for surface hardness (HRC 55-60); precision-machined outer diameter to fit the cylinder body; surface anti-corrosion treatment

1. Outer surface wear due to friction with the cylinder inner wall and contaminated oil; 2. Deformation caused by uneven hydraulic pressure; 3. Corrosion from hydraulic oil contamination.

1. Replace hydraulic oil regularly to avoid contamination; 2. Inspect the piston cylinder for deformation monthly with a micrometer; 3. Lubricate the outer surface with hydraulic oil before installation.

3

P2300002AA

Piston rod

High-strength alloy steel (40Cr); chrome-plated surface (plating thickness 0.05-0.1mm) for wear and corrosion resistance; precision-ground for straightness and smoothness; heat-treated for tensile strength

1. Chrome plating peeling and scratching from debris or improper handling; 2. Rod bending due to lateral impact during steering; 3. Corrosion from saltwater or chemical drilling fluids in offshore sites.

1. Avoid hitting the piston rod with tools or obstacles; 2. Polish minor scratches with fine sandpaper to prevent plating peeling; 3. Rinse with fresh water and dry thoroughly after use in offshore environments, then apply anti-rust oil.

4

P7100142AA

Connection seat

Cast alloy steel (ZG35CrMo); annealing treatment to eliminate internal stress; precision-machined mounting holes and hydraulic interfaces; surface anti-rust paint coating

1. Crack formation due to uneven force during installation or steering; 2. Thread wear of hydraulic interfaces from repeated disassembly; 3. Corrosion from hydraulic oil leakage and outdoor exposure.

1. Ensure the connection seat is properly aligned during installation to distribute force evenly; 2. Use a torque wrench to tighten hydraulic connectors to the specified torque; 3. Inspect for oil leakage monthly and touch up anti-rust paint if needed.

1

P0900031AA

Spherical hinge

High-carbon chromium bearing steel (GCr15); heat-treated for high hardness and wear resistance; precision-ground spherical surface; nickel-plated for anti-rust protection; sealed with rubber to prevent debris entry

1. Spherical surface wear due to lack of lubrication; 2. Jamming caused by debris entering the hinge; 3. Corrosion from moisture and outdoor exposure.

1. Lubricate the spherical surface with lithium-based grease every 30 working hours; 2. Inspect the rubber seal monthly and replace if damaged to prevent debris entry; 3. Clean the hinge surface regularly to remove dust and mud.

2

P2001941AA

Spherical pin

Alloy steel (35CrMoA); carburized and quenched for surface hardness (HRC 58-62); precision-machined spherical end; surface black oxide treatment for anti-rust

1. Spherical end wear due to friction with the spherical hinge; 2. Pin body bending due to lateral impact during steering; 3. Thread wear from over-tightening the nut.

1. Tighten the spherical pin nut to the specified torque (35-40N·m); 2. Avoid sudden, forceful steering that causes lateral impact; 3. Lubricate the spherical end before installing the hinge.

3

P1000126AA

Washer, spherical pin

Carbon steel (Q235); precision-machined for flatness; surface zinc-plated for anti-rust protection; smooth surface to reduce friction between the nut and spherical pin

1. Wear and thinning caused by long-term friction and vibration; 2. Deformation due to uneven pressure from over-tightening; 3. Rust and corrosion from moisture.

1. Replace the washer every time the spherical pin nut is disassembled; 2. Ensure the washer is properly aligned to distribute pressure evenly; 3. Store washers in a dry environment to prevent rust.

4

P1200137AA

Nut, spherical pin

Alloy steel (40Cr); heat-treated for high hardness; surface zinc-plated for anti-rust protection; precision-machined internal threads to match the spherical pin

1. Thread stripping due to over-tightening or cross-threading during installation; 2. Corrosion from moisture and hydraulic oil contamination; 3. Fatigue failure caused by steering vibration.

1. Align the nut with the thread correctly before tightening to avoid cross-threading; 2. Use a torque wrench to ensure proper tightening torque; 3. Apply anti-seize compound to threads before installation.

5

P2000139AA

Pin shaft

Alloy steel (35CrMoA); heat-treated for toughness and wear resistance; precision-machined for dimensional accuracy; surface black oxide treatment

1. Wear of the pin surface due to long-term rotation and friction; 2. Shear failure caused by uneven force during steering; 3. Corrosion from moisture and chemical contact.

1. Lubricate the pin shaft with lithium-based grease every 35 working hours; 2. Inspect the pin for bending or wear monthly, replacing if found; 3. Apply anti-rust grease to the pin before installation.

6

P2200195AA

Screw plug, pin seat

Carbon steel (Q355B); heat-treated for hardness; surface zinc-plated for anti-rust protection; precision-machined external threads to seal the pin seat

1. Thread wear due to repeated disassembly and assembly; 2. Leakage caused by improper sealing or thread damage; 3. Corrosion from moisture entering the pin seat.

1. Apply thread sealant during installation to ensure a tight seal; 2. Minimize repeated disassembly to reduce thread wear; 3. Inspect the thread for damage before installation, replacing if needed.

7

P2000062AA

Sphecial pin seat

Alloy steel (20CrMnTi); carburized and quenched for wear resistance; precision-machined inner hole to fit the pin; surface anti-rust treatment

1. Inner hole wear due to friction with the pin shaft; 2. Crack formation due to local stress concentration; 3. Corrosion from moisture and dust buildup.

1. Ensure the pin is properly seated to distribute force evenly; 2. Inspect the inner hole for wear quarterly, replacing the pin seat if wear exceeds 0.7mm; 3. Clean the pin seat regularly to prevent dust buildup.

1

P9000029AA

Spring

High-carbon spring steel (65Mn); heat-treated for elasticity and fatigue resistance; precision-wound to ensure uniform stiffness; surface shot blasting + anti-rust coating

1. Elastic fatigue and deformation due to long-term repeated compression from hydraulic pressure; 2. Corrosion from hydraulic oil contamination or moisture; 3. Breakage caused by exceeding the spring’s elastic limit.

1. Never exceed the spring’s elastic limit during cylinder disassembly/assembly; 2. Replace the spring every 12 months to avoid fatigue failure; 3. Use clean hydraulic oil to prevent corrosion and wear.

2

P2000063AA

Spring seat

Alloy steel (40Cr); heat-treated for hardness and wear resistance; precision-machined surface to fit the spring; surface black oxide treatment for anti-rust

1. Wear of the contact surface due to friction with the spring; 2. Deformation caused by uneven pressure from the spring; 3. Corrosion from moisture and hydraulic oil.

1. Ensure the spring is properly aligned with the spring seat to distribute pressure evenly; 2. Inspect the contact surface for wear quarterly, replacing if needed; 3. Lubricate the contact surface with lithium-based grease before installing the spring.

1

P1700028AA

Sealing ring

High-pressure resistant nitrile rubber (NBR); shore hardness 70-75°; oil-resistant and wear-resistant; designed to fit the cylinder’s internal grooves

1. Aging and cracking caused by high temperature, hydraulic oil, and long-term use; 2. Damage from sharp edges or debris during installation; 3. Deformation due to excessive hydraulic pressure.

1. Replace all sealing rings every 6 months or if cracks/aging are found; 2. Use a plastic tool to install sealing rings to avoid damage from sharp edges; 3. Ensure the sealing groove is clean before installation.

2

P1700029AA

Sealing ring

High-pressure resistant nitrile rubber (NBR); shore hardness 70-75°; oil-resistant and wear-resistant; designed to fit the piston rod’s sealing groove

1. Aging and cracking caused by high temperature and hydraulic oil; 2. Wear due to friction with the piston rod; 3. Damage from debris entering the sealing groove.

1. Replace when the piston rod is disassembled to avoid reusing worn seals; 2. Clean the piston rod surface before installing the seal to remove debris; 3. Store sealing rings in a cool, dry place away from direct sunlight.

3

P1700030AA

Sealing ring

High-pressure resistant nitrile rubber (NBR); shore hardness 70-75°; oil-resistant and wear-resistant; designed to fit the cylinder end cover’s sealing interface

1. Aging and cracking caused by long-term exposure to hydraulic oil and temperature fluctuations; 2. Damage during end cover disassembly/assembly; 3. Leakage due to improper installation.

1. Tighten the end cover bolts evenly to ensure proper seal compression; 2. Replace the seal every time the end cover is removed; 3. Inspect the seal for damage before installation, discarding any defective parts.

4

5300100224

O ring 82.5×3.55

Nitrile rubber (NBR); oil-resistant and weather-resistant; precision-molded to size 82.5×3.55mm; high elasticity to ensure a tight seal

1. Aging and hardening caused by hydraulic oil and high temperature; 2. Damage from sharp edges during installation; 3. Deformation due to excessive compression.

1. Ensure the O-ring size (82.5×3.55mm) matches the groove before installation; 2. Install gently to avoid stretching or tearing the O-ring; 3. Replace O-rings every 6 months as part of routine maintenance.

5

5300100220

O ring φ80x3.55

Nitrile rubber (NBR); oil-resistant and weather-resistant; precision-molded to size φ80×3.55mm; high elasticity to prevent oil leakage

1. Aging and cracking caused by long-term use and hydraulic oil exposure; 2. Damage from debris in the sealing groove; 3. Leakage due to improper groove fit.

1. Clean the sealing groove thoroughly before installing the O-ring; 2. Do not stretch the O-ring excessively during installation; 3. Replace if the O-ring shows signs of aging (hardening, cracks).

6

5300100059

O ring 20X2.65

Nitrile rubber (NBR); oil-resistant and weather-resistant; precision-molded to size 20×2.65mm; designed for small hydraulic interfaces

1. Aging and hardening caused by hydraulic oil and temperature; 2. Damage from improper installation with sharp tools; 3. Loss of elasticity due to long-term compression.

1. Use tweezers or plastic tools to install, avoiding sharp metal tools; 2. Replace the O-ring every time the hydraulic interface is disassembled; 3. Store in a sealed container to prevent dust and moisture.

7

P1000048AA

Wear ring

Polytetrafluoroethylene (PTFE); high wear resistance and self-lubricating performance; heat-resistant and oil-resistant; designed to reduce piston cylinder wear

1. Wear due to long-term friction with the piston cylinder; 2. Damage from debris entering the cylinder; 3. Deformation caused by high temperature.

1. Replace the wear ring every time the piston cylinder is disassembled; 2. Clean the cylinder inner wall before installing the wear ring; 3. Ensure the wear ring is properly seated in the groove to avoid deformation.

1

4302312060

Hexagon bolt M12×1.5×60

Alloy steel (35CrMoA); heat-treated for high tensile strength (grade 10.9); surface black oxide treatment; precision-machined thread (M12×1.5)

1. Thread wear or fracture due to over-tightening; 2. Fatigue failure caused by steering vibration; 3. Corrosion from moisture and outdoor exposure.

1. Tighten with a torque wrench to the specified torque (30-35N·m); 2. Inspect the bolt for bending or thread damage monthly, replacing if needed; 3. Apply anti-rust grease to the bolt body before installation.

2

P2200188AA

Bolt, end cover

Alloy steel (35CrMoA); heat-treated for high strength; surface zinc-plated for anti-rust protection; precision-machined to fit the cylinder end cover

1. Thread wear due to repeated disassembly; 2. Fatigue failure caused by hydraulic pressure vibration; 3. Corrosion from moisture and hydraulic oil leakage.

1. Tighten end cover bolts evenly in a crisscross pattern; 2. Replace bolts after 5 disassembly cycles to avoid fatigue; 3. Inspect for oil leakage around the end cover monthly.

3

4313700090

Elastic retaining ring 90

Spring steel (65Mn); heat-treated for elasticity and toughness; surface zinc-plated for anti-rust protection; size 90mm to fit the piston rod

1. Elastic fatigue and deformation due to long-term compression; 2. Rust and breakage caused by moisture; 3. Damage during installation/removal with improper tools.

1. Use a retaining ring plier to install/remove, avoiding brute force; 2. Replace the retaining ring every time it is removed; 3. Store in a dry environment to prevent rust.

4

P1000053AA

Retaining ring

Spring steel (65Mn); heat-treated for elasticity; surface zinc-plated for anti-rust protection; precision-machined to fit internal grooves

1. Elastic fatigue and deformation due to long-term use; 2. Rust and corrosion from moisture; 3. Damage from improper installation.

1. Ensure the retaining ring is fully seated in the groove; 2. Inspect for deformation monthly, replacing if needed; 3. Use proper tools to avoid bending or breaking.

5

4313700042

Elastic retaining ring 42

Spring steel (65Mn); heat-treated for elasticity and toughness; surface zinc-plated for anti-rust protection; size 42mm to fit small components

1. Elastic fatigue and breakage caused by long-term compression; 2. Rust from moisture; 3. Damage during installation with improper tools.

1. Use a small retaining ring plier for installation/removal; 2. Replace after each removal to avoid fatigue; 3. Check the groove size before installation to ensure a proper fit.

6

4313800072

Elastic retaining ring 72

Spring steel (65Mn); heat-treated for elasticity and toughness; surface zinc-plated for anti-rust protection; size 72mm to fit intermediate components

1. Elastic fatigue and deformation due to long-term use; 2. Rust and corrosion from moisture; 3. Damage from brute force during installation.

1. Install the retaining ring gently to avoid stretching; 2. Inspect for rust monthly, replacing if needed; 3. Ensure the ring is properly seated to prevent component movement.

7

4314504040

Cotter pin 4X60

Carbon steel (Q235); surface zinc-plated for anti-rust protection; precision-bent; size 4×60mm to lock slotted nuts

1. Fatigue breakage caused by steering vibration; 2. Rust and corrosion from moisture; 3. Damage during installation due to forcing into mismatched holes.

1. Ensure the cotter pin size (4×60mm) matches the hole diameter; 2. Replace after each disassembly to avoid fatigue; 3. Bend the pin ends properly to ensure secure locking.

8

4314504060

Cotter pin 4X40

Carbon steel (Q235); surface zinc-plated for anti-rust protection; precision-bent; size 4×40mm to lock small slotted nuts

1. Fatigue breakage caused by vibration; 2. Rust from moisture; 3. Damage during installation with pliers.

1. Use proper pliers to bend the pin ends, avoiding excessive force; 2. Replace after each disassembly; 3. Store in a dry container to prevent rust.

9

4314504036

Cotter pin 4X36

Carbon steel (Q235); surface zinc-plated for anti-rust protection; precision-bent; size 4×36mm to lock small components

1. Fatigue breakage caused by long-term vibration; 2. Rust and corrosion from moisture; 3. Damage during installation.

1. Replace the cotter pin every time the locked component is disassembled; 2. Ensure the pin is fully inserted into the hole before bending; 3. Inspect for rust regularly.

10

4313100012

Spring washer 12

Spring steel (65Mn); heat-treated for elasticity; surface zinc-plated for anti-rust protection; size 12mm to match M12 bolts

1. Elastic fatigue and deformation due to long-term compression; 2. Rust and breakage caused by moisture; 3. Damage from over-tightening the bolt.

1. Replace the spring washer every time the bolt is disassembled; 2. Use a torque wrench to avoid over-tightening; 3. Store in a dry environment to prevent rust.

11

4310000012

Hex nut M12

Carbon steel (Q355B); heat-treated for hardness; surface zinc-plated for anti-rust protection; precision-machined thread (M12)

1. Thread stripping due to over-tightening or cross-threading; 2. Rust and seizing caused by moisture; 3. Deformation due to uneven torque.

1. Align the nut with the bolt thread correctly before tightening; 2. Use a torque wrench to ensure proper tightening torque; 3. Apply anti-seize compound to threads in humid environments.

12

4317600022

Hexagon slotted thin nut-fine thread M20X1.5

Alloy steel (40Cr); heat-treated for high hardness; surface zinc-plated for anti-rust protection; fine thread (M20×1.5) for precise locking

1. Thread wear due to over-tightening or repeated disassembly; 2. Slot damage caused by improper cotter pin installation; 3. Corrosion from moisture and hydraulic oil.

1. Tighten to the specified torque, then insert the cotter pin correctly; 2. Avoid using pliers to force the cotter pin into the slot; 3. Clean threads before installation to remove rust or debris.

13

4312500022

Hex self-lock nut M22X1.5

Alloy steel (40Cr); heat-treated for high strength; surface zinc-plated for anti-rust protection; self-locking design to prevent loosening; fine thread (M22×1.5)

1. Self-locking function failure due to thread wear; 2. Corrosion from moisture and hydraulic oil; 3. Deformation due to over-tightening.

1. Replace the nut if the self-locking function fails (loose after tightening); 2. Do not over-tighten, as this damages the self-locking structure; 3. Apply anti-rust grease to the thread surface.

14

P5200012AA

Locking clamp

Carbon steel (Q235); heat-treated for toughness; surface zinc-plated for anti-rust protection; precision-bent to ensure secure clamping

1. Fatigue deformation due to long-term clamping force; 2. Rust and corrosion from moisture; 3. Breakage caused by over-clamping.

1. Adjust the clamping force appropriately to avoid over-clamping; 2. Inspect for deformation monthly, replacing if needed; 3. Clean the clamp regularly and apply anti-rust oil.

1

4101800008

Straight grease nipple M10X1

Carbon steel (Q235); surface zinc-plated for anti-rust protection; precision-machined thread (M10×1); ball check valve for leak-proof lubrication

1. Clogging caused by dust, mud, or old grease buildup; 2. Thread damage during grease gun connection; 3. Rust and corrosion leading to grease leakage.

1. Clean the grease nipple top with a cloth before connecting the grease gun; 2. Connect the grease gun gently to avoid thread damage; 3. Inject grease until it overflows slightly, then wipe excess to prevent dust buildup.

2

P2000061AA

Plug, cylinder

Carbon steel (Q355B); heat-treated for hardness; surface zinc-plated for anti-rust protection; precision-machined thread to seal the cylinder’s oil hole

1. Thread wear due to repeated disassembly; 2. Leakage caused by improper sealing or thread damage; 3. Corrosion from moisture entering the oil hole.

1. Apply thread sealant during installation to ensure a tight seal; 2. Minimize repeated disassembly to reduce thread wear; 3. Inspect the plug for corrosion monthly, replacing if needed.

1

Can the O-ring 82.5×3.55 (5300100224) be replaced with the O-ring φ80×3.55 (5300100220)?

No. The two O-rings have different inner diameters (82.5mm vs. 80mm) and are designed for specific sealing grooves in the cylinder. Using the wrong size will cause poor sealing, hydraulic oil leakage, and reduced steering assist performance—always use the matching O-ring model.

2

How often should I replace the sealing rings and O-rings of the steering power assisting cylinder to prevent leakage?

For routine maintenance, replace all sealing rings and O-rings every 6 months. Additionally, replace them whenever the cylinder is disassembled (e.g., for piston rod or piston cylinder maintenance), as repeated assembly can damage seals. In harsh offshore or chemical drilling environments, shorten the replacement cycle to 4 months.

3

What should I do if the piston rod (P2300002AA) has minor scratches, and does it need to be replaced immediately?

Minor scratches (depth <0.05mm) can be polished with fine sandpaper to prevent further plating peeling and seal wear. If scratches are deeper than 0.05mm, replace the piston rod immediately—deep scratches will damage seals, cause oil leakage, and accelerate cylinder inner wall wear, leading to more costly repairs.