Steering Mechanism & Related Parts for ZJ40 Drilling Rig

1

Z02030000016AA

Steering mechanism

High-strength alloy steel (40CrNiMoA) main frame with precision-machined components; surface treated with epoxy anti-rust coating to resist corrosion from rain, mud, and drilling fluids; key joints hardened for wear resistance

1. Fatigue deformation of the main frame due to long-term exposure to uneven steering force; 2. Joint wear and jamming caused by insufficient lubrication; 3. Corrosion and rust from long-term outdoor exposure and chemical contact.

1. Avoid sudden, forceful steering when the rig is fully loaded to reduce frame stress; 2. Lubricate all joints with lithium-based grease every 35 working hours; 3. Clean the mechanism surface regularly and reapply anti-rust coating if peeling occurs.

1

Z02030100008AA

Steering gear assembly

Precision-cast alloy steel (ZG35CrMo) housing; high-hardness gear set (20CrMnTi) with carburizing and quenching treatment; sealed with nitrile rubber oil seals for leak-proof performance

1. Gear wear and tooth damage caused by contaminated lubricating oil; 2. Oil leakage due to aging or damaged oil seals; 3. Internal jamming from debris entering the gear housing.

1. Replace steering gear oil every 6 months to avoid contamination; 2. Inspect for oil leakage monthly, replacing damaged oil seals promptly; 3. Keep the gear housing opening clean during maintenance to prevent debris entry.

2

Z02030900002AA

Steering power assisting cylinder

High-precision seamless steel pipe (20Mn2) cylinder body; chrome-plated alloy steel piston rod (40Cr); nitrile rubber piston seals for high-pressure resistance

1. Piston rod wear and scratching caused by debris or sharp objects; 2. Seal aging and leakage due to high pressure and temperature; 3. Cylinder body corrosion from long-term outdoor exposure.

1. Protect the piston rod with a dust cover when not in use; 2. Inspect the piston rod surface for scratches monthly, polishing minor scratches with fine sandpaper; 3. Use clean, high-pressure hydraulic oil to avoid seal damage.

3

Z02030902003AA

Support, power assisting cylinder

Cast alloy steel (ZG270-500) with annealing treatment to eliminate internal stress; surface anti-rust paint coating; precision-machined mounting holes for stable installation

1. Crack formation due to uneven force during steering; 2. Wear of mounting holes caused by long-term vibration; 3. Paint peeling and corrosion from rain and mud.

1. Ensure the support is firmly fixed and aligned before installing the power assisting cylinder; 2. Inspect mounting holes quarterly for wear, replacing the support if wear exceeds 0.7mm; 3. Touch up anti-rust paint on peeling areas promptly.

1

Z02030700015AA

Control tie rod

High-strength alloy steel (35CrMoA) rod body; precision-machined threads; surface galvanized for anti-rust protection; spherical joints for flexible movement

1. Thread wear and deformation caused by over-tightening during assembly; 2. Spherical joint wear due to lack of lubrication; 3. Bending deformation from lateral impact during steering.

1. Tighten the tie rod with a torque wrench to the specified torque (40-45N·m); 2. Lubricate spherical joints every 30 working hours with lithium-based grease; 3. Avoid hitting rocks or obstacles with the tie rod during operation.

2

Z02030600003AA

Straight tie rod

Seamless alloy steel (20Mn2) rod body; heat-treated for toughness; surface black oxide treatment; threaded ends for adjustable length; corrosion-resistant coating on joints

1. Fatigue wear of the rod body due to frequent steering vibration; 2. Thread damage from repeated adjustment or disassembly; 3. Corrosion of joints from moisture or chemical drilling fluids.

1. Minimize unnecessary length adjustments to reduce thread wear; 2. Inspect the rod body for cracks monthly, replacing immediately if found; 3. Apply anti-rust grease to joints after adjustment or maintenance.

3

Z02030600004AA

Connection rod

Alloy steel (40Cr) rod body; carburized and quenched for surface hardness; precision-machined connecting holes; surface anti-rust treatment to resist harsh environments

1. Wear of connecting holes caused by long-term friction with pins; 2. Shear failure due to uneven steering force; 3. Bending deformation from heavy loads or impact.

1. Ensure connecting pins are properly installed to distribute force evenly; 2. Check connecting holes quarterly for wear, replacing the rod if wear exceeds 0.8mm; 3. Avoid sudden, forceful steering that causes excessive stress on the rod.

1

Z02031000003AA

Support, connection arm

Cast alloy steel (ZG35CrMo) with heat treatment to enhance strength; surface anti-rust paint coating; precision-machined mounting surfaces for stable connection

1. Crack formation due to local stress concentration during steering; 2. Wear of mounting surfaces caused by long-term vibration; 3. Corrosion from outdoor exposure and moisture.

1. Ensure the support is properly aligned with the connection arm to distribute stress evenly; 2. Inspect for cracks monthly, repairing or replacing immediately if found; 3. Clean the support surface regularly to prevent rust buildup.

2

Z02030500004AA

Left front connection arm

Alloy steel (35CrMoA) forging; heat-treated for toughness and wear resistance; surface black oxide treatment; precision-drilled holes for pin connection

1. Wear of pin holes caused by long-term friction with shaft pins; 2. Fatigue fracture due to frequent steering vibration; 3. Corrosion from rain, mud, or chemical contact.

1. Lubricate pin holes with lithium-based grease every 35 working hours; 2. Check pin holes for wear quarterly, replacing the arm if wear exceeds 0.6mm; 3. Apply anti-rust grease to the arm after cleaning to prevent corrosion.

3

Z02030500005AA

Right front connection arm

Alloy steel (35CrMoA) forging; heat-treated for toughness and wear resistance; surface black oxide treatment; precision-drilled holes for pin connection

1. Wear of pin holes caused by long-term friction with shaft pins; 2. Bending deformation from lateral impact during steering; 3. Corrosion from outdoor exposure and chemical drilling fluids.

1. Avoid hitting obstacles with the right front wheel to prevent arm deformation; 2. Inspect the arm for bending monthly, replacing if found; 3. Clean the arm with neutral detergent after use in muddy or chemical environments.

4

Z02030500006AA

Left middle connection arm

Alloy steel (35CrMoA) forging; heat-treated for toughness and wear resistance; surface black oxide treatment; precision-drilled holes for pin connection

1. Fatigue wear due to long-term transmission of steering force; 2. Pin hole wear caused by insufficient lubrication; 3. Corrosion from moisture and dust buildup.

1. Lubricate pin holes regularly to reduce friction; 2. Inspect the arm for wear and tear monthly, replacing if necessary; 3. Keep the arm clean to prevent dust and moisture buildup in pin holes.

5

Z02030500007AA

Right middle connection arm

Alloy steel (35CrMoA) forging; heat-treated for toughness and wear resistance; surface black oxide treatment; precision-drilled holes for pin connection

1. Fatigue wear due to long-term transmission of steering force; 2. Pin hole wear caused by insufficient lubrication; 3. Corrosion from moisture and dust buildup.

1. Lubricate pin holes regularly to reduce friction; 2. Inspect the arm for wear and tear monthly, replacing if necessary; 3. Keep the arm clean to prevent dust and moisture buildup in pin holes.

6

Z02030500008AA

Left rear connection arm

Alloy steel (35CrMoA) forging; heat-treated for toughness and wear resistance; surface black oxide treatment; precision-drilled holes for pin connection

1. Wear of pin holes caused by long-term friction with shaft pins; 2. Fatigue fracture due to frequent steering vibration; 3. Corrosion from long-term outdoor exposure.

1. Lubricate pin holes with lithium-based grease every 35 working hours; 2. Check the arm for cracks monthly, replacing immediately if found; 3. Store the rig in a covered area when not in use to protect the arm from corrosion.

7

Z02031300001AA

Hanger, cross tie rod

Cast alloy steel (ZG270-500); annealing treatment to eliminate internal stress; surface anti-rust paint coating; designed to support and fix the cross tie rod

1. Crack formation due to heavy load from the cross tie rod; 2. Wear of the mounting surface caused by long-term vibration; 3. Paint peeling and corrosion from rain and mud.

1. Ensure the hanger is firmly fixed to the rig frame; 2. Inspect the hanger for cracks monthly, replacing if found; 3. Touch up anti-rust paint on peeling areas to prevent corrosion.

8

Z02030200006AA

Support, steering gear

Cast alloy steel (ZG35CrMo); heat-treated for high strength; surface anti-rust paint coating; precision-machined mounting holes to fix the steering gear securely

1. Crack formation due to vibration from the steering gear; 2. Wear of mounting holes caused by long-term use; 3. Corrosion from outdoor exposure and moisture.

1. Tighten the steering gear mounting bolts to the specified torque (50-55N·m); 2. Inspect the support for cracks monthly, repairing or replacing immediately if found; 3. Clean the support surface regularly to prevent rust.

1

P1200116AA

Spherical pin nut

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

1. Thread wear due to over-tightening or repeated disassembly; 2. Corrosion from moisture or hydraulic oil contamination; 3. Deformation caused by uneven torque during tightening.

1. Tighten with a torque wrench to the specified torque (30-35N·m); 2. Replace the nut after 5 disassembly cycles to avoid thread wear; 3. Apply anti-seize compound to threads before installation.

2

P1200134AA

Spherical pin nut, distribution valve

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

1. Thread wear due to over-tightening or hydraulic vibration; 2. Corrosion from hydraulic oil contamination; 3. Failure to lock securely due to thread damage.

1. Tighten evenly to avoid uneven torque; 2. Inspect the nut monthly for thread wear, replacing if needed; 3. Keep hydraulic oil clean to prevent contamination and corrosion.

3

P2000135AA

Spherical pin, distribution valve

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

1. Spherical surface wear due to lack of lubrication; 2. Scratches caused by debris in hydraulic oil; 3. Corrosion from hydraulic oil contamination.

1. Lubricate the spherical surface with high-temperature hydraulic grease before installation; 2. Replace hydraulic oil regularly to avoid debris and contamination; 3. Inspect the spherical surface for scratches monthly, replacing if found.

1

4303918060

Eye bolt M18X1.5X60

Alloy steel (35CrMoA); heat-treated for high tensile strength (grade 10.9); surface black oxide treatment; precision-machined thread (M18X1.5) and eyelet

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

1. Tighten with a torque wrench to the specified torque (45-50N·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

4316900017

Slotted nut M18X1.5

Carbon steel (Q355B); heat-treated for hardness; surface zinc-plated for anti-rust protection; internal thread precision-machined (M18X1.5); slotted design for cotter pin locking

1. Thread stripping due to over-tightening; 2. Slot damage caused by improper cotter pin installation; 3. Rust and seizing caused by moisture.

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

3

4314532040

Cotter pin

Carbon steel (Q235); surface zinc-plated for anti-rust protection; precision-bent for easy installation; high toughness to prevent breakage

1. Fatigue breakage caused by long-term steering vibration; 2. Rust and corrosion from moisture; 3. Damage during installation or removal due to improper tool use.

1. Replace the cotter pin every time the slotted nut is disassembled; 2. Use proper tools to install/remove the cotter pin, avoiding bending or breaking; 3. Store cotter pins in a dry environment to prevent rust.

4

4314504030

Cotter pin 4X28

Carbon steel (Q235); surface zinc-plated for anti-rust protection; precision-bent for easy installation; size 4X28mm to match slotted nuts and pins

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

1. Ensure the cotter pin size (4X28mm) matches the hole diameter before installation; 2. Replace after each disassembly to avoid fatigue breakage; 3. Bend the cotter pin ends properly to ensure secure locking.

1

Can the left front connection arm (Z02030500004AA) be used interchangeably with the right front connection arm (Z02030500005AA)?

No. The left and right front connection arms are designed with opposite angles and mounting positions to match the ZJ40’s steering geometry. Interchanging them will cause severe steering misalignment, uneven tire wear, and potential steering failure—always use the correct arm for each side.

2

How often should I maintain the steering power assisting cylinder (Z02030900002AA) to avoid leakage and failure?

Conduct weekly inspections: check for oil leakage and clean the piston rod surface. Every 3 months, inspect the piston rod for scratches and replace aging seals. Every 6 months, replace the hydraulic oil and clean the cylinder interior—this prevents contamination and extends the cylinder’s service life.

3

What is the purpose of the cotter pins (4314532040 and 4314504030) in the steering mechanism, and can they be reused?

Cotter pins lock slotted nuts and spherical pin nuts to prevent loosening from steering vibration—critical for safety. They cannot be reused, as bending them during installation weakens their structure; reuse increases the risk of breakage and component loosening. Always replace cotter pins after each disassembly.