Spare Parts for Main Drum and Sand Drum of Drawworks

1

Main Drum

JC28/11-03-00

High-strength alloy steel (40Cr), quenched and tempered to ensure hardness (HRC 28-32) and toughness

1. Long-term high-load winding causes fatigue wear on the drum surface; 2. Abrasion from contact with steel wire rope; 3. Corrosion from harsh working environment (dust, moisture).

1. Regularly check the drum surface for wear and replace the steel wire rope if it is severely worn; 2. Clean the drum surface regularly to remove dust and debris; 3. Apply anti-corrosion lubricant to the surface after cleaning.

2

Brake Block

JC28A-02-08

High-temperature resistant friction material (asbestos-free), with a steel backplate for structural support

1. Frequent braking generates high temperature, leading to friction material aging and wear; 2. Uneven braking force causes partial wear; 3. Contamination by oil or grease reduces friction and accelerates wear.

1. Avoid frequent emergency braking to reduce high-temperature impact; 2. Check braking force uniformity regularly and adjust if necessary; 3. Keep the brake block clean and free of oil contamination.

3

Left Hand Screw Stem

JC28A-02-10

Medium carbon steel (45#), precision machined and surface galvanized for corrosion resistance

1. Reciprocating motion causes thread wear and deformation; 2. Lack of lubrication leads to dry friction between threads; 3. Impact load during operation causes thread damage.

1. Apply high-temperature resistant lubricating grease to the threads regularly; 2. Avoid overloading the screw stem during operation; 3. Check threads for deformation or damage monthly and repair in time.

4

Left Hand Nut

JC28A-02-20

Alloy steel (40CrNiMo), heat-treated to improve wear resistance and impact toughness

1. Thread wear caused by matching motion with the left-hand screw stem; 2. Uneven force leads to partial thread damage; 3. Corrosion from external dust and moisture.

1. Replace the nut synchronously when replacing the left-hand screw stem; 2. Clean the nut inner thread regularly and apply lubricant; 3. Avoid using the nut if there is obvious thread deformation.

5

Connecting Arm

JC28A-02-12

Carbon structural steel (Q235B), welded and normalized to eliminate internal stress

1. Fatigue damage caused by long-term alternating loads; 2. Welding seam cracking due to improper maintenance; 3. Impact deformation during equipment operation.

1. Regularly inspect the welding seam for cracks and repair by professional welders if found; 2. Avoid sudden impact loads on the connecting arm; 3. Check the connecting arm for deformation every quarter.

6

Crank

JC28/11-06-00

Alloy steel (35CrMo), forged and heat-treated to enhance structural strength and wear resistance

1. Wear at the shaft hole caused by long-term rotation; 2. Fatigue fracture due to alternating bending loads; 3. Corrosion from harsh working conditions.

1. Check the shaft hole wear regularly and replace the crank if the wear exceeds the standard (GB/T 3811-2008); 2. Apply lubricant to the shaft hole regularly; 3. Store the crank in a dry and clean environment when not in use.

7

Right Hand Nut

JC28A-02-18

Alloy steel (40CrNiMo), heat-treated to improve wear resistance and impact toughness

1. Thread wear caused by matching motion with the right-hand screw stem; 2. Uneven force leads to partial thread damage; 3. Corrosion from external dust and moisture.

1. Replace the nut synchronously when replacing the right-hand screw stem; 2. Clean the nut inner thread regularly and apply lubricant; 3. Avoid using the nut if there is obvious thread deformation.

8

Right Screw Stem

JC28A-02-17

Medium carbon steel (45#), precision machined and surface galvanized for corrosion resistance

1. Reciprocating motion causes thread wear and deformation; 2. Lack of lubrication leads to dry friction between threads; 3. Impact load during operation causes thread damage.

1. Apply high-temperature resistant lubricating grease to the threads regularly; 2. Avoid overloading the screw stem during operation; 3. Check threads for deformation or damage monthly and repair in time.

9

Connecting Rod

JC28/11-03-12

Alloy steel (40Cr), forged and precision machined, surface oxidized to prevent corrosion

1. Fatigue wear at the connecting ends caused by long-term alternating loads; 2. Bending deformation due to excessive impact; 3. Internal stress concentration leads to fracture.

1. Check the connecting ends for wear regularly and replace if necessary; 2. Avoid sudden impact during operation; 3. Conduct non-destructive testing (NDT) annually to detect internal defects.

10

Crank Arm

JC28/11-03-07-00

Carbon structural steel (Q355B), welded and heat-treated to improve structural stability

1. Wear at the hinge hole caused by long-term rotation; 2. Welding seam cracking due to fatigue load; 3. Corrosion from dust and moisture in the working environment.

1. Regularly lubricate the hinge hole to reduce wear; 2. Inspect the welding seam for cracks monthly and repair promptly; 3. Clean the crank arm surface regularly to prevent corrosion.

11

Lower Crank Arm

No Model Specified

Carbon structural steel (Q355B), welded and normalized to eliminate internal stress

1. Fatigue damage caused by long-term bearing of the main drum’s weight; 2. Wear at the connecting part with other components; 3. Deformation due to uneven force.

1. Check the lower crank arm for deformation regularly; 2. Lubricate the connecting part monthly to reduce wear; 3. Avoid overloading the main drum to reduce the load on the lower crank arm.

12

Balance Weight

JC28A-02-15-00

Cast iron (HT200), precision cast to ensure accurate weight and structural integrity

1. Wear at the connection part caused by long-term vibration; 2. Cracks caused by impact during installation or operation; 3. Corrosion from external environment.

1. Install the balance weight firmly to reduce vibration; 2. Avoid impact during installation and transportation; 3. Apply anti-corrosion paint to the surface regularly.

13

Balance Beam

JC28/11-03-10

Alloy steel (35CrMo), forged and heat-treated to enhance bending strength and toughness

1. Fatigue bending caused by long-term alternating loads; 2. Wear at the support points; 3. Corrosion from harsh working conditions.

1. Check the balance beam for bending deformation regularly; 2. Lubricate the support points monthly to reduce wear; 3. Clean the surface and apply anti-corrosion lubricant regularly.

14

Brake Shaft

JC28/11-03-11

High-strength alloy steel (40Cr), quenched and tempered, surface nitrided to improve wear resistance

1. Wear at the bearing position caused by long-term rotation; 2. Fatigue fracture due to alternating torque; 3. Corrosion from oil and moisture.

1. Regularly check the bearing position for wear and replace the bearing if necessary; 2. Apply high-temperature resistant lubricating grease to the shaft surface; 3. Avoid overloading the brake shaft during braking.

15

Brake Stop

JC21A-03-07

Carbon steel (45#), heat-treated to improve hardness and wear resistance

1. Impact wear caused by frequent contact with the brake component; 2. Deformation due to excessive impact force; 3. Corrosion from external dust and moisture.

1. Check the brake stop for wear and deformation regularly; 2. Adjust the brake clearance to avoid excessive impact; 3. Clean the brake stop surface and apply anti-corrosion paint.

16

Anti Collision Crank Arm

JC21A-03-06

Carbon structural steel (Q235B), welded and reinforced to enhance impact resistance

1. Impact damage caused by collision with other components during operation; 2. Welding seam cracking due to fatigue; 3. Corrosion from harsh environment.

1. Regularly inspect the anti-collision crank arm for cracks and deformation; 2. Clean the surface and apply anti-corrosion lubricant; 3. Ensure the equipment operates within the safe range to avoid collisions.

1

Sand Drum

JC28/11-04A-00

High-strength alloy steel (40Cr), quenched and tempered to ensure hardness (HRC 28-32) and wear resistance

1. Wear caused by long-term contact with sand and gravel; 2. Fatigue wear on the drum surface due to winding operations; 3. Corrosion from moisture and chemical substances in the working environment.

1. Clean the sand drum surface regularly to remove sand and gravel; 2. Apply wear-resistant and anti-corrosion coating to the surface; 3. Check the drum surface for wear monthly and repair in time.

2

Sprocket

JC28/11-04-03

Alloy steel (40CrNiMo), forged and heat-treated to improve tooth surface hardness (HRC 45-50) and wear resistance

1. Tooth surface wear caused by meshing with the chain; 2. Tooth deformation due to excessive load; 3. Corrosion from external dust and moisture.

1. Check the chain tension regularly to avoid excessive meshing force; 2. Apply lubricating grease to the tooth surface regularly; 3. Replace the sprocket if the tooth wear exceeds 10% (GB/T 1243-2006).

3

Oil Seal

HG4-692-67

Nitrile rubber (NBR), with a steel skeleton to enhance structural strength, oil-resistant and high-temperature resistant

1. Aging and hardening caused by long-term contact with lubricating oil and high temperature; 2. Damage caused by improper installation; 3. Wear caused by dust and debris entering the seal gap.

1. Install the oil seal with a professional tool to avoid damage to the seal lip; 2. Replace the oil seal every 6 months or when oil leakage is found; 3. Clean the seal installation position before replacement.

4

Bearing

GB286-64

High-carbon chromium bearing steel (GCr15), heat-treated to improve hardness and wear resistance, precision ground

1. Wear caused by lack of lubrication or use of inferior lubricating oil; 2. Damage caused by foreign matter entering the bearing; 3. Fatigue damage due to long-term high-speed rotation.

1. Use high-quality lubricating oil that meets GB/T 30582-2014 standard; 2. Clean the bearing regularly and replace the lubricating oil; 3. Check the bearing for abnormal noise and temperature during operation.

5

Brake Drum

JC28/11-04-08-00

Alloy steel (35CrMo), forged and heat-treated to ensure high hardness and heat resistance

1. Wear caused by frequent friction with the brake block; 2. Thermal deformation caused by high temperature during braking; 3. Corrosion from external environment.

1. Avoid frequent emergency braking to reduce high-temperature impact; 2. Check the brake drum for deformation and wear regularly; 3. Clean the brake drum surface and apply anti-corrosion lubricant.

6

Drum Body

JC28/11-04-10-00

High-strength alloy steel (40Cr), rolled and welded, heat-treated to eliminate internal stress

1. Wear caused by long-term contact with sand and gravel; 2. Welding seam cracking due to fatigue load; 3. Corrosion from moisture and dust.

1. Clean the drum body surface regularly to remove sand and debris; 2. Inspect the welding seam for cracks monthly and repair promptly; 3. Apply anti-corrosion and wear-resistant coating to the surface.

7

Roller Shaft

JC28/11-04-11

Medium carbon steel (45#), precision machined and surface galvanized for corrosion resistance

1. Wear at the bearing position caused by long-term rotation; 2. Bending deformation due to excessive load; 3. Corrosion from oil and moisture.

1. Regularly check the bearing position for wear and replace the bearing if necessary; 2. Apply lubricating grease to the shaft surface regularly; 3. Avoid overloading the roller shaft during operation.

8

Bearing

GB286-64

High-carbon chromium bearing steel (GCr15), heat-treated to improve hardness and wear resistance, precision ground

1. Wear caused by lack of lubrication or use of inferior lubricating oil; 2. Damage caused by foreign matter entering the bearing; 3. Fatigue damage due to long-term high-speed rotation.

1. Use high-quality lubricating oil that meets GB/T 30582-2014 standard; 2. Clean the bearing regularly and replace the lubricating oil; 3. Check the bearing for abnormal noise and temperature during operation.

9

Oil Seal

HG4-692-67

Nitrile rubber (NBR), with a steel skeleton to enhance structural strength, oil-resistant and high-temperature resistant

1. Aging and hardening caused by long-term contact with lubricating oil and high temperature; 2. Damage caused by improper installation; 3. Wear caused by dust and debris entering the seal gap.

1. Install the oil seal with a professional tool to avoid damage to the seal lip; 2. Replace the oil seal every 6 months or when oil leakage is found; 3. Clean the seal installation position before replacement.

10

Push Plate Clutch

ATD124

Alloy steel (40Cr) for the main body, friction plate made of asbestos-free high-temperature resistant material

1. Wear of the friction plate caused by frequent engagement and disengagement; 2. Damage to the push plate due to uneven force; 3. Oil contamination leading to reduced friction performance.

1. Avoid frequent rapid engagement and disengagement; 2. Keep the clutch clean and free of oil contamination; 3. Check the friction plate wear regularly and replace if necessary.

11

Intake Pipe Assembly

No Model Specified

Seamless steel pipe (20#), with a plastic or rubber connector for sealing

1. Blockage caused by dust and debris entering the pipe; 2. Corrosion of the steel pipe caused by moisture; 3. Damage to the connector due to vibration.

1. Clean the intake pipe regularly to avoid blockage; 2. Check the connector for looseness and damage monthly; 3. Apply anti-corrosion paint to the steel pipe surface regularly.

12

Sprocket

JC28/11-04-21

Alloy steel (40CrNiMo), forged and heat-treated to improve tooth surface hardness (HRC 45-50) and wear resistance

1. Tooth surface wear caused by meshing with the chain; 2. Tooth deformation due to excessive load; 3. Corrosion from external dust and moisture.

1. Check the chain tension regularly to avoid excessive meshing force; 2. Apply lubricating grease to the tooth surface regularly; 3. Replace the sprocket if the tooth wear exceeds 10% (GB/T 1243-2006).

13

O-ring

φ 22.4*2.65 GB3452.1-82

Nitrile rubber (NBR), oil-resistant, high-temperature resistant, and elastic

1. Aging and hardening caused by long-term contact with lubricating oil and high temperature; 2. Damage caused by improper installation (over-compression); 3. Wear caused by dust and debris.

1. Install the O-ring correctly without over-compression; 2. Replace the O-ring every 6 months or when oil leakage is found; 3. Clean the installation position before replacement.

14

DC Contactor

CZ28-2400/10

Copper alloy for contacts, plastic shell (flame-retardant ABS), iron core made of silicon steel sheet

1. Contact wear caused by frequent on-off operations; 2. Overheating damage due to excessive current; 3. Damage to the shell caused by external impact or moisture.

1. Ensure the operating current does not exceed the rated current; 2. Check the contacts for wear regularly and replace if necessary; 3. Install the contactor in a dry and shock-proof environment.

15

DC Contactor

CZ28-3000/10

Copper alloy for contacts, plastic shell (flame-retardant ABS), iron core made of silicon steel sheet

1. Contact wear caused by frequent on-off operations; 2. Overheating damage due to excessive current; 3. Damage to the shell caused by external impact or moisture.

1. Ensure the operating current does not exceed the rated current; 2. Check the contacts for wear regularly and replace if necessary; 3. Install the contactor in a dry and shock-proof environment.

16

DC Contactor

CZH-1200/20

Copper alloy for contacts, plastic shell (flame-retardant ABS), iron core made of silicon steel sheet

1. Contact wear caused by frequent on-off operations; 2. Overheating damage due to excessive current; 3. Damage to the shell caused by external impact or moisture.

1. Ensure the operating current does not exceed the rated current; 2. Check the contacts for wear regularly and replace if necessary; 3. Install the contactor in a dry and shock-proof environment.

1

How often should the oil seal (HG4-692-67) of the sand drum be replaced?

It is recommended to replace the oil seal every 6 months under normal operating conditions. If oil leakage is found during daily inspection, the oil seal should be replaced immediately to avoid damage to the bearing and other components.

2

What are the criteria for replacing the sprocket (JC28/11-04-03 and JC28/11-04-21)?

According to the national standard GB/T 1243-2006, when the tooth surface wear of the sprocket exceeds 10%, or there is obvious tooth deformation, cracking, or damage, the sprocket should be replaced immediately to avoid chain jamming or disengagement.

3

Why does the left-hand screw stem (JC28A-02-10) often have thread damage, and how to avoid it?

The main reasons for thread damage are dry friction (lack of lubrication), impact load, and long-term reciprocating motion. To avoid it, apply high-temperature resistant lubricating grease to the threads monthly, avoid overloading the screw stem during operation, and check the threads for deformation or damage regularly.