JC28/11 Drawworks Repair Kit Catalog

1

Oil Seal

PD220×260×18

Nitrile Rubber (NBR) with metal frame; high oil resistance and wear resistance

1. Long-term contact with contaminated lubricating oil causes rubber aging and hardening; 2. Axial runout of the drum shaft leads to uneven pressure on the seal lip.

1. Use high-quality compatible lubricants and replace oil regularly; 2. Check and adjust shaft alignment to ensure radial and axial runout within allowable limits before installation.

2

Oil Seal

PD190×225×18

Nitrile Rubber (NBR) with metal frame; enhanced lip elasticity for tight sealing

1. Particulate contamination in the working environment scratches the seal lip; 2. Temperature fluctuations in drilling operations accelerate rubber fatigue.

1. Clean the shaft surface and installation cavity thoroughly before assembly; 2. Avoid exposure to extreme temperature changes; use thermal insulation measures if working in cold/hot regions.

3

Bearing

22236 CC/W33

High-carbon chromium bearing steel (GCr15); carburized and quenched for high hardness

1. Heavy-load impact during hoisting causes raceway pitting; 2. Inadequate lubrication leads to metal-to-metal friction and overheating.

1. Ensure sufficient lubrication with grease compatible with high-load and high-temperature conditions; 2. Avoid sudden overloads during hoisting operations; operate the drawworks at a steady speed.

4

Bearing

6234

High-carbon chromium bearing steel (GCr15); precision ground raceway for low friction

1. Shaft misalignment causes uneven load distribution on the bearing; 2. Contaminants entering the bearing interior abrade the rolling elements.

1. Check and correct shaft parallelism and concentricity during installation; 2. Install effective dust-proof seals to prevent particulate matter from entering the bearing cavity.

5

Clutch Gas Bag

30"

Reinforced rubber with high-strength fabric insert; anti-aging and pressure-resistant

1. Compressed air impurities cause internal rubber erosion; 2. Overinflation or frequent pressure fluctuations lead to rubber fatigue and cracking.

1. Install an air filter and dryer in the air supply system to ensure clean, dry air; 2. Strictly follow the recommended inflation pressure; avoid frequent rapid pressure changes.

6

Clutch Friction Disc

30"

Sintered copper-based friction material; high-temperature resistance and stable friction coefficient

1. Frequent clutch engagement/disengagement causes abrasive wear; 2. Overheating due to slipping reduces material integrity.

1. Operate the clutch smoothly to minimize slipping; 2. Regularly check clutch adjustment to ensure proper engagement gap and avoid overheating.

7

Clutch Thrust Disc

30"

42CrMo alloy steel; quenched and tempered for high impact resistance and toughness

1. Axial impact load during clutch engagement causes surface indentation; 2. Wear due to misalignment leading to uneven contact with friction disc.

1. Ensure clutch release mechanism is properly aligned to avoid uneven load; 2. Inspect for surface damage regularly and replace if indentations exceed 0.5mm.

8

Spring

JC28/11-03-03

60Si2Mn alloy spring steel; heat-treated for high elasticity and fatigue resistance

1. Long-term cyclic loading causes fatigue failure; 2. Corrosion due to oil contamination and humid working environment.

1. Regularly clean the spring surface and apply anti-corrosion lubricant; 2. Avoid overloading the spring beyond its design limit; check for deformation periodically.

9

Brake Pad (Intwining type)

JC28/11-03-13

Fiber-reinforced resin-based friction material; low noise and stable braking performance

1. Frequent braking causes abrasive wear of friction material; 2. Heat accumulation during continuous braking accelerates material degradation.

1. Avoid continuous long-time braking; allow proper cooling intervals; 2. Adjust brake clearance regularly to ensure uniform contact and reduce local overheating.

10

Brake Pad (Casting type)

JC28A-02-08

Cast iron-based friction material with alloy additives; high wear resistance for heavy-load braking

1. Impact load during emergency braking causes material chipping; 2. Thermal stress from rapid temperature changes leads to cracking.

1. Minimize emergency braking; operate the brake system smoothly; 2. Check for thermal cracks regularly; replace immediately if cracks are detected to prevent sudden failure.

1

Clutch

ATD124

High-strength aluminum alloy housing with steel internal components; lightweight and durable

1. Abrasive dust ingress causes internal component wear; 2. Improper adjustment leads to uneven engagement and increased friction.

1. Install effective dust covers to prevent dust from entering the clutch housing; 2. Follow manufacturer’s guidelines for clutch adjustment to ensure proper engagement and disengagement.

2

Air Bag of the Clutch

24″

High-pressure resistant rubber with polyester cord reinforcement; anti-abrasion and anti-aging

1. Contaminants in compressed air cause internal rubber degradation; 2. Frequent pressure cycles lead to fatigue and leakage.

1. Maintain clean air supply with regular filter replacement; 2. Avoid rapid pressure build-up and release; operate the air system at a steady pressure.

3

Clutch Friction Disc

24″

Ceramic-reinforced friction material; high-temperature resistance and low wear rate

1. Frequent slipping during clutch engagement causes rapid wear; 2. Dust contamination increases abrasive wear of friction surface.

1. Ensure proper clutch adjustment to minimize slipping; 2. Clean the friction surface regularly to remove accumulated dust and debris.

4

Clutch Thrust Disc

24″

40Cr alloy steel; surface nitriding treatment for high hardness and wear resistance

1. Axial impact during clutch engagement causes surface wear; 2. Misalignment leads to uneven contact and localized damage.

1. Check clutch release mechanism alignment regularly; correct any misalignment promptly; 2. Inspect surface roughness periodically; replace if wear exceeds 1mm.

5

Braid Brake Block

XJ40C-09-01

Woven asbestos-free fiber with resin binding; high friction coefficient and low dust emission

1. Continuous braking causes abrasive wear of fiber material; 2. Heat accumulation degrades the resin binding agent.

1. Avoid prolonged continuous braking; allow adequate cooling time; 2. Regularly check brake pad thickness; replace when thickness is below the minimum wear limit.

6

Foundry Brake Block

XJ40C-09-05

Cast steel with embedded friction particles; high impact resistance for heavy-duty braking

1. Emergency braking causes thermal shock and cracking; 2. Abrasive dust accelerates surface wear.

1. Minimize emergency braking; use gradual braking when possible; 2. Clean the brake disc and pad surface regularly to remove abrasive dust.

7

Oil Sealing

PG130×160×15

FKM (Viton) rubber; excellent resistance to high temperature, oil, and chemicals

1. High-temperature oil causes rubber aging and hardening; 2. Shaft surface scratches damage the seal lip.

1. Use high-temperature resistant lubricating oil; 2. Inspect the shaft surface for scratches before installation; polish or replace the shaft if necessary.

8

Oil Sealing

PG125×150×14

FKM (Viton) rubber with stainless steel frame; corrosion-resistant and high-pressure resistant

1. Chemical contaminants in oil degrade the rubber; 2. Axial movement of the shaft causes excessive stress on the seal.

1. Ensure the lubricating oil is compatible with FKM rubber; 2. Install shaft retainers to limit axial movement within the allowable range.