Rear Suspension Assembly & Related Parts for ZJ40 Drilling Rig

1

Z02040000008AA

Rear suspension assembly

High-strength alloy steel (40CrNiMoA), quenched and tempered for enhanced toughness and load-bearing capacity; surface anti-rust coating (epoxy resin)

1. Fatigue deformation caused by long-term bearing of excessive loads exceeding the rated capacity; 2. Corrosion from long-term exposure to rain, mud, or chemical drilling fluids; 3. Welding seam cracking due to frequent severe vibration during rig operation.

1. Strictly adhere to the rated load (not exceeding 110% of the rated value) during use; 2. Clean the surface with neutral detergent after construction and reapply anti-rust coating annually; 3. Inspect welding seams monthly for cracks, and repair immediately if found.

1

5002400089

Distance rod assembly (upper) L=610

High-strength seamless steel pipe (20Mn2) with alloy steel connectors; surface galvanized anti-rust treatment

1. Bending deformation caused by uneven lateral force during rig turning or uneven ground operation; 2. Wear of connecting ends due to lack of lubrication; 3. Corrosion and rust from long-term outdoor exposure.

1. Avoid sharp turns or rapid direction changes when the rig is fully loaded; 2. Lubricate connecting ends with lithium-based grease every 40 working hours; 3. Store in a dry, covered area when not in use to prevent galvanized layer damage.

2

P2200185AA

Connection bolt, distance rod

Alloy steel (35CrMoA), heat-treated for high tensile strength (grade 10.9); surface black oxide treatment

1. Thread wear or fracture due to over-tightening during assembly; 2. Fatigue failure caused by frequent vibration; 3. Corrosion of threads from moisture or chemical contact.

1. Tighten with a torque wrench to the specified torque (45-50N·m) during assembly; 2. Inspect threads for wear or deformation monthly, replace if damaged; 3. Apply thread lock compound during installation to prevent loosening from vibration.

3

4312700020

Hex flat nut M20X1.5

Carbon steel (Q355B), heat-treated for hardness; surface zinc-plated to resist corrosion

1. Thread stripping due to over-tightening or mismatch with bolts; 2. Rust and seizing caused by moisture; 3. Deformation of the nut flange due to uneven force.

1. Use only with matching M20X1.5 bolts (grade 10.9); 2. Clean threads with a wire brush before installation to remove rust or debris; 3. Do not reuse nuts that have been over-tightened or deformed.

4

4317400020

Hex thick nut M20X1.5

Carbon steel (Q355B), thickened flange design for enhanced load-bearing; surface zinc-plated anti-rust treatment

1. Thread wear from repeated disassembly and assembly; 2. Corrosion between the nut and bolt due to humid environments; 3. Flange deformation caused by uneven torque during tightening.

1. Minimize repeated disassembly; replace nuts after 5 disassembly cycles; 2. Apply anti-seize compound to threads before installation; 3. Tighten evenly to avoid flange deformation, using a torque wrench.

5

P7100141AA

Support, distance rod

Cast alloy steel (ZG35CrMo), annealing treatment to eliminate internal stress; surface anti-rust paint coating

1. Crack formation due to local stress concentration during heavy-load operation; 2. Wear of the connecting hole caused by long-term friction with bolts; 3. Paint peeling and corrosion from outdoor exposure.

1. Ensure the support is fully seated and aligned before tightening bolts; 2. Check the connecting hole’s inner diameter quarterly, replace if wear exceeds 0.8mm; 3. Touch up anti-rust paint on peeling areas promptly.

6

P2200186AA

Set screw, distance rod

Alloy steel (40Cr), heat-treated for high hardness (HRC 55-58); surface black oxide treatment

1. Thread damage due to improper installation (cross-threading); 2. Shear failure caused by excessive lateral force; 3. Corrosion in humid or chemical environments.

1. Align the screw with the thread hole correctly before tightening, avoid cross-threading; 2. Do not use the set screw to bear excessive lateral force; 3. Apply anti-rust grease to the screw before installation.

7

4313100020

Spring washer 20

Spring steel (65Mn), heat-treated for elasticity and toughness; surface zinc-plated anti-rust treatment

1. Elastic fatigue and deformation caused by long-term compression and vibration; 2. Rust and corrosion leading to breakage; 3. Damage from over-tightening during assembly.

1. Replace the spring washer every time the nut is disassembled; 2. Store in a dry environment to prevent rust; 3. Do not over-tighten the nut, as this will damage the washer’s elasticity.

8

4101800008

Grease nipple M10X1

Carbon steel (Q235), surface zinc-plated; internal thread precision-machined for grease flow

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 nipple’s 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 grease to prevent dust buildup.

1

Z02041200001AA

Balance beam assembly

High-strength alloy steel (40Cr) beam with cast steel connectors; surface shot blasting + anti-rust coating

1. Bending deformation caused by uneven vertical load on rough ground; 2. Wear of connecting shafts due to lack of lubrication; 3. Corrosion from long-term exposure to rain and mud.

1. Avoid operating the rig on extremely uneven ground when fully loaded; 2. Lubricate all connecting shafts with lithium-based grease every 30 working hours; 3. Clean the beam surface regularly and reapply anti-rust coating if peeling occurs.

2

P1000122AA

Shim, support, balance beam

High-carbon steel (SK5), heat-treated for flatness and hardness; surface anti-rust plating

1. Wear and thinning caused by long-term friction between the balance beam and support; 2. Deformation due to uneven pressure; 3. Rust and corrosion from moisture.

1. Inspect the shim’s thickness monthly, replace if worn to less than 0.5mm; 2. Ensure the shim is properly aligned to avoid uneven pressure; 3. Clean the shim and support surface before installation to remove debris.

3

P1000123AA

Shim, support, balance beam

High-carbon steel (SK5), heat-treated for flatness and hardness; surface anti-rust plating

1. Wear caused by frequent vibration and friction; 2. Damage from improper installation (misalignment); 3. Corrosion in humid or chemical environments.

1. Replace the shim if any cracks or deformation are found; 2. Use the correct size shim (matching the balance beam support) to avoid misalignment; 3. Apply a thin layer of anti-rust oil to the shim before installation.

4

Z02041300001AA

Oil seal, support, balance beam

Nitrile rubber (NBR) with steel skeleton; oil-resistant and wear-resistant, shore hardness 70-75°

1. Aging and cracking caused by high temperature, vibration, or oil contamination; 2. Damage to the seal lip from debris during installation; 3. Oil leakage leading to dry friction and further damage.

1. Replace the oil seal every 6 months or if oil leakage is found; 2. Clean the installation hole and shaft surface before installing the new oil seal; 3. Avoid using sharp tools during installation to prevent damage to the seal lip.

5

P1100194AA

Copper sleeve, balance beam

Phosphor bronze (QSn6-6-3), high wear resistance and self-lubricating performance; precision-machined inner diameter

1. Wear of the inner surface due to lack of lubrication and frequent rotation; 2. Scratches caused by debris entering the sleeve; 3. Deformation due to excessive pressure.

1. Inject lubricating oil into the sleeve every 25 working hours to ensure self-lubrication; 2. Clean the sleeve and shaft before assembly to remove debris; 3. Replace the sleeve if the inner diameter wear exceeds 1mm.

6

Z02041400001AA

Supporting shaft

Alloy steel (35CrMoA), carburized and quenched for surface hardness (HRC 60-62); surface grinding for precision

1. Wear of the shaft surface due to dry friction or debris; 2. Fatigue fracture caused by frequent vibration and heavy loads; 3. Corrosion from moisture or chemical drilling fluids.

1. Ensure the copper sleeve is properly installed to provide lubrication; 2. Inspect the shaft surface for scratches or wear monthly, polish minor scratches with fine sandpaper; 3. Apply anti-rust grease to the shaft when not in use.

7

P1400098AA

Horizontal stable rod, balance beam

High-strength steel rod (20MnSi), heat-treated for toughness; surface galvanized anti-rust treatment

1. Bending deformation caused by lateral impact during rig operation; 2. Wear of connecting ends due to vibration; 3. Corrosion and rust from outdoor exposure.

1. Avoid sudden lateral impacts (e.g., hitting rocks) during operation; 2. Inspect connecting ends for wear quarterly, replace if damaged; 3. Store in a covered area to prevent galvanized layer damage.

8

P2000094AA

External shaft pin, balance beam

Alloy steel (40Cr), heat-treated for high strength and toughness; surface black oxide treatment

1. Wear of the pin surface due to long-term rotation and friction; 2. Shear failure caused by uneven force; 3. Corrosion in humid environments.

1. Lubricate the pin with lithium-based grease every 30 working hours; 2. Check the pin for bending or deformation monthly, replace if found; 3. Apply anti-rust grease to the pin before installation.

9

P1000097AA

Locating ring, shaft pin, balance beam

Carbon steel (Q235), precision-machined for dimensional accuracy; surface zinc-plated anti-rust treatment

1. Wear caused by friction between the locating ring and shaft pin; 2. Deformation due to uneven pressure; 3. Rust and seizing caused by moisture.

1. Inspect the locating ring’s inner diameter regularly, replace if wear exceeds 0.6mm; 2. Ensure the ring is properly seated to avoid uneven pressure; 3. Clean the ring and shaft pin before assembly.

10

Z02040400005AA

Rubber sleeve assembly, balance beam

Chloroprene rubber (CR), oil-resistant and weather-resistant; steel core for structural stability

1. Aging, cracking, and hardening caused by long-term exposure to sunlight, high temperature, or oil; 2. Tearing due to excessive stretching during installation or operation; 3. Damage from sharp debris.

1. Replace the rubber sleeve every 8 months or if cracks are found; 2. Install the sleeve gently, avoid excessive stretching; 3. Protect the sleeve from sharp objects during operation and storage.

11

P1400100AA

Sleeve, shaft pin, balance beam

Alloy steel (20CrMnTi), carburized and quenched for wear resistance; precision-machined inner and outer diameters

1. Wear of the inner surface due to friction with the shaft pin; 2. Scratches caused by debris entering the sleeve; 3. Corrosion from moisture or chemical contact.

1. Lubricate the sleeve’s inner surface before installing the shaft pin; 2. Clean the sleeve thoroughly to remove debris before assembly; 3. Replace the sleeve if inner surface wear exceeds 0.8mm.

12

P1400101AA

Internal shaft pin, balance beam

Alloy steel (40CrNiMoA), heat-treated for high tensile strength and toughness; surface grinding for precision

1. Fatigue wear caused by frequent rotation and heavy loads; 2. Corrosion from internal lubricating oil contamination; 3. Shear failure due to uneven force distribution.

1. Replace the lubricating oil regularly to avoid contamination; 2. Inspect the pin for wear or cracks every 40 working hours; 3. Ensure the pin is properly aligned to distribute force evenly.

13

P2200147AA

Set screw, shaft pin, balance beam

Alloy steel (40Cr), heat-treated for high hardness; surface black oxide treatment

1. Thread damage due to cross-threading during installation; 2. Shear failure caused by excessive force; 3. Corrosion from moisture or oil.

1. Align the screw with the thread hole correctly before tightening; 2. Do not use the set screw to bear excessive force; 3. Apply thread lock compound and anti-rust grease during installation.

14

4317400018

Hex thick nut M18X1.5

Carbon steel (Q355B), thickened flange for enhanced load-bearing; surface zinc-plated anti-rust treatment

1. Thread stripping due to over-tightening or mismatch with bolts; 2. Rust and seizing caused by moisture; 3. Flange deformation from uneven torque.

1. Use only with matching M18X1.5 bolts; 2. Tighten with a torque wrench to the specified torque (35-40N·m); 3. Apply anti-seize compound to threads before installation.

15

4313000018

Spring washer 18

Spring steel (65Mn), heat-treated for elasticity; surface zinc-plated anti-rust treatment

1. Elastic fatigue and deformation caused by long-term vibration; 2. Rust and breakage from moisture; 3. Damage from over-tightening.

1. Replace the washer every time the nut is disassembled; 2. Store in a dry environment to prevent rust; 3. Avoid over-tightening the nut to preserve the washer’s elasticity.

16

4317100018

Flat washer 18

Carbon steel (Q235), precision-machined for flatness; surface zinc-plated anti-rust treatment

1. Wear and thinning caused by long-term friction between the nut and component; 2. Deformation due to uneven pressure; 3. Rust and corrosion from moisture.

1. Inspect the washer for deformation or wear monthly, replace if needed; 2. Ensure the washer is properly aligned to distribute pressure evenly; 3. Clean the washer surface before installation to remove debris.

1

P2200189AA

Set screw, support, sub-pump

Alloy steel (35CrMoA), heat-treated for high strength; surface black oxide treatment

1. Thread wear due to over-tightening during assembly; 2. Fatigue failure caused by sub-pump vibration; 3. Corrosion from oil or moisture.

1. Tighten with a torque wrench to the specified torque (30-35N·m); 2. Inspect the screw monthly for wear or loosening, retighten if needed; 3. Apply thread lock compound and anti-rust grease during installation.

2

P2000140AA

Stable pin, support, rear sub-pump

Alloy steel (40Cr), heat-treated for toughness and wear resistance; surface grinding for precision

1. Wear of the pin surface due to sub-pump vibration; 2. Shear failure caused by uneven force; 3. Corrosion from moisture or oil contamination.

1. Lubricate the pin with lithium-based grease every 35 working hours; 2. Check the pin for bending or cracks quarterly, replace if found; 3. Clean the pin and installation hole before assembly.

3

P7100099AA

Support, rear sub-pump

Cast alloy steel (ZG270-500), annealing treatment to eliminate internal stress; surface anti-rust paint coating

1. Crack formation due to sub-pump vibration and heavy load; 2. Wear of the fixing hole caused by long-term friction with the stable pin; 3. Paint peeling and corrosion from outdoor exposure.

1. Ensure the support is firmly fixed to the rig body before installing the sub-pump; 2. Inspect the fixing hole’s inner diameter monthly, replace if wear exceeds 0.7mm; 3. Touch up anti-rust paint on peeling areas promptly.

1

Can the distance rod assembly (5002400089, L=610) be replaced with a longer or shorter one for ZJ40 rigs?

No. The distance rod’s length (610mm) is specifically designed for the ZJ40 rig’s rear suspension structure. Using a longer or shorter rod will cause uneven force distribution, suspension displacement, and damage to related parts—compromising the rig’s stability and safety.

2

How often should I replace the rubber sleeve assembly (Z02040400005AA) of the balance beam?

It is recommended to replace the rubber sleeve every 8 months under normal operating conditions. For harsh environments (frequent exposure to sunlight, high temperature, or oil), shorten the replacement interval to 6 months. Replace immediately if cracks, hardening, or tearing are found.

3

What is the difference between hex flat nut (4312700020) and hex thick nut (4317400020), and can they be mixed?

The hex thick nut (4317400020) has a thicker flange for enhanced load-bearing and stability, used in high-vibration positions (e.g., distance rod connectors). The hex flat nut (4312700020) is thinner, used in low-vibration areas. They cannot be mixed—using the wrong nut will lead to loosening or part damage.