XCDZ Rotary Table Gear Box Repair Kit

1

O-ring

90*3.55

Nitrile Butadiene Rubber (NBR) 70 Shore A; superior oil resistance and elastic recovery

1. Long-term exposure to high-temperature gear oil causes rubber aging and compression set; 2. Installation scratches on the sealing surface lead to localized leakage.

1. Use a plastic installation tool to avoid scratching the O-ring and sealing groove; 2. Ensure the gear oil is compatible with NBR and replace oil at the recommended maintenance intervals.

2

O-ring

95*3.55

Nitrile Butadiene Rubber (NBR) 70 Shore A; enhanced tensile strength for high-vibration environments

1. Continuous vibration from rotary table operation causes fatigue cracking; 2. Contaminants embedded in the sealing groove abrade the O-ring surface.

1. Thoroughly clean the sealing groove with a non-abrasive brush before installation; 2. Maintain the O-ring’s compression ratio between 25-35% to balance sealing effect and fatigue life.

3

O-ring

85*3.55

Nitrile Butadiene Rubber (NBR) 70 Shore A; low temperature flexibility (-30°C to 120°C)

1. Cold start-up in low-temperature drilling areas causes rubber brittleness; 2. Improper storage (exposure to ozone or sunlight) degrades material properties.

1. Store O-rings in a cool, dark, and ozone-free environment; 2. Pre-heat the gear box to above 0°C before start-up in cold climates to avoid brittle failure.

4

Oil seal

PG110*140*14

FKM (Viton) with carbon steel reinforcement; high-temperature resistance (up to 200°C) and chemical stability

1. Shaft surface roughness exceeds the limit, causing accelerated wear of the seal lip; 2. High-speed shaft rotation generates excessive heat, aging the seal material.

1. Ensure the shaft surface roughness is ≤ Ra 0.8μm; polish or replace worn shafts promptly; 2. Apply a thin layer of compatible grease to the seal lip during installation to reduce initial wear.

5

Oil seal

PG100*130*12

Polytetrafluoroethylene (PTFE) lip with NBR body; low friction and high wear resistance

1. Metal particles in contaminated gear oil scratch the PTFE lip; 2. Shaft axial play causes repeated deflection of the seal lip, leading to fatigue.

1. Regularly replace the oil filter to keep gear oil clean; 2. Check and adjust the shaft axial play to within 0.05-0.12mm as per the equipment manual.

6

Oil seal

PG240*280*20

FKM (Viton) with stainless steel housing; corrosion resistance and high-pressure sealing capability

1. Over-tightening of the seal housing distorts the seal lip; 2. Seawater or moisture ingress in offshore drilling environments causes corrosion of the housing.

1. Torque the seal housing bolts to the manufacturer’s specified value using a torque wrench; 2. Apply anti-corrosion coating to the housing surface in offshore or humid environments.

7

Oil seal

PG95*120*12

Silicone rubber with carbon steel reinforcement; wide temperature range (-40°C to 180°C)

1. Thermal shock from sudden temperature changes causes rubber cracking; 2. Improper installation leads to misalignment of the seal lip and shaft.

1. Avoid rapid heating or cooling of the gear box; allow gradual temperature change during start-up and shutdown; 2. Use a seal installation sleeve to ensure coaxiality between the seal and the shaft.

1

Bearing

22218

High-carbon chromium bearing steel (GCr15); carburized and quenched, hardness HRC 62-65

1. Inadequate grease filling leads to metal-to-metal contact and raceway wear; 2. Shaft misalignment causes uneven load distribution and edge loading.

1. Fill the bearing cavity with 35-45% high-temperature lithium-based grease (NLGI Grade 2); 2. Check the shaft concentricity with a dial indicator; correct misalignment exceeding 0.05mm.

2

Bearing

22219

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

1. Shock loads from sudden gear engagement damage the rolling elements; 2. Dust and metal particles entering the bearing cause abrasive wear.

1. Operate the gear box smoothly to avoid sudden load impacts; 2. Ensure the gear box’s dust-proof seals are intact and replace damaged seals promptly.

3

Bearing

6044

GCr15 bearing steel with molybdenum disulfide coating; enhanced wear and friction reduction

1. High operating temperature accelerates grease degradation and bearing wear; 2. Axial overload exceeds the bearing’s design limit, causing raceway deformation.

1. Monitor the gear box temperature during operation; avoid prolonged operation above 120°C; 2. Ensure the gear transmission system is properly adjusted to prevent axial overload.

4

Bearing

6218

GCr15 bearing steel; deep groove design for radial load capacity

1. Water ingress in humid environments causes rust and pitting of the raceway; 2. Improper installation (hammering directly on the bearing ring) damages the raceway.

1. Check for water ingress in the gear box regularly; replace grease if water content exceeds 0.2%; 2. Use a bearing press for installation to avoid direct impact on the bearing rings.

5

Bearing

6317

GCr15SiMn bearing steel; high tensile strength and impact toughness

1. Repeated cyclic loads cause fatigue failure of the raceway; 2. Contaminated grease with impurities accelerates wear of rolling elements.

1. Regularly inspect the bearing for vibration and noise; replace at the first sign of fatigue; 2. Use only high-purity grease that meets the equipment’s technical specifications.