YM-16Ⅱ Hydraulic Cathead Parts Catalog

1

Travelling Block Assy

YM-16Ⅱ-02.00C

ZG35CrMo Cast Steel (Main Body) + GCr15 Bearing Steel (Internal Bearings) + Carbon Steel (Fastening Components)

1. Weld joint fatigue cracking from cyclic load impact (load fluctuation ±20% of rated capacity); 2. Internal bearing seizure due to lubrication neglect.

1. Conduct ultrasonic testing (UT) of key weld joints every 6 months; 2. Lubricate internal bearings with high-temperature anti-wear grease every 50 operating hours; inspect for abnormal noise monthly.

2

Crown Block Assy

YM-16Ⅱ-03.00C

ZG35CrMo Cast Steel (Main Body) + Alloy Steel (Axles) + GCr15 Bearings

1. Structural deformation from long-term overloading (exceeding rated load by 15%); 2. Corrosion of external surfaces in high-humidity offshore or coastal drilling environments.

1. Strictly comply with rated load limits; monitor load during operation; 2. Apply marine-grade anti-corrosion coating annually; inspect for rust spots quarterly and touch up promptly.

3

Guiding wheel assy

YM-16Ⅱ-03.00

Alloy Steel (Wheel Body) + GCr15 Bearings + Carbon Steel (Bracket)

1. Wheel surface wear from long-term wire rope friction; 2. Bracket loosening due to drilling vibration (vibration frequency 5-25Hz).

1. Inspect wheel surface wear monthly; replace if wear depth exceeds 10% of wire rope diameter; 2. Re-torque bracket fasteners monthly using a calibrated torque wrench.

4

Roller bracket assy

YM-16Ⅱ-04.00C

Carbon Steel Q355B (Bracket Body) + Alloy Steel (Axle) + GCr15 Bearings

1. Bracket bending from lateral load impact; 2. Internal bearing damage from dust and drilling fluid ingress.

1. Avoid lateral load impact during operation; install anti-collision buffers; 2. Install dust-proof and waterproof seals; clean the bracket interior quarterly.

1

Pulley assy

YM-16Ⅱ 81-01.04

ZG35CrMo Cast Steel (Pulley Body) + GCr15 Bearings + Copper Alloy (Bushings)

1. Pulley groove abrasive wear from long-term wire rope friction; 2. Bearing seizure due to lubrication contamination by drilling fluid.

1. Match pulley groove diameter with wire rope diameter (ratio ≥12) to reduce wear; re-machine if wear depth exceeds 0.5mm; 2. Use drilling fluid-resistant grease for lubrication; replace bearings if abnormal rotation is detected.

2

Pulley assy

YM-16Ⅱ1-01.04

ZG35CrMo Cast Steel (Pulley Body) + GCr15 Bearings

1. Thermal fatigue of pulley body from extreme temperature fluctuations (desert/arctic drilling); 2. Corrosion of bearing races in humid environments.

1. Inspect for thermal cracks quarterly in extreme environments; 2. Lubricate bearings with anti-corrosion grease; store spare pulleys in a dry environment.

3

Sliding axle

YM16-Ⅱ81-03.4

42CrMo Alloy Steel (Quenched & Tempered, Precision Ground)

1. Journal wear from sliding friction with bushings; 2. Fatigue cracking from cyclic bending loads.

1. Lubricate journals with high-pressure anti-wear grease every 30 operating hours; 2. Conduct magnetic particle testing (MPT) annually to detect fatigue cracks.

4

Axle

YM-10.03.05

40Cr Alloy Steel (Quenched & Tempered)

1. Keyway wear from repeated assembly and disassembly; 2. Corrosion of exposed surfaces in drilling fluid environments.

1. Use hydraulic tools for key assembly/disassembly to reduce keyway damage; 2. Apply anti-corrosion coating to exposed surfaces; inspect for rust monthly.

5

Axle

YM-16Ⅱ-04.02C

42CrMo Alloy Steel (Forged & Precision Machined)

1. Torsional fatigue from high-torque transmission; 2. Impact damage from sudden load changes during drill pipe handling.

1. Monitor torque values during operation to avoid sudden overloads; 2. Inspect axle straightness quarterly; correct if deformation exceeds 0.05mm.

6

Guide wheel axle

BYYN-10-Ⅱ-A2-1

42CrMo Alloy Steel (Heat-Treated)

1. Wear from rotational friction with guide wheel bearings; 2. Loosening of axial positioning components due to vibration.

1. Replace bearings annually to reduce axle wear; 2. Inspect axial positioning nuts monthly and re-torque if necessary.

7

Guide wheel

BYYN-10-Ⅱ-A2-01.01

Alloy Steel (Wheel Body, Surface Hardened to HRC55-60)

1. Wheel edge damage from wire rope deviation; 2. Fatigue pitting of wheel surface from cyclic load impact.

1. Adjust wire rope alignment to avoid deviation; install guiding plates if needed; 2. Conduct MPT of wheel surface annually to detect fatigue pitting.

8

Roller bushing

HYM 20Ⅱ-11.05

ZCuSn10Pb1 Bronze (Anti-Wear, Anti-Seizure)

1. Abrasive wear from rotational friction with axles; 2. Corrosion from drilling fluid immersion.

1. Lubricate with drilling fluid-resistant grease; 2. Replace if wear exceeds 0.3mm or if corrosion pitting is severe.

9

Roller bushing

HYM 20Ⅱ-11.05

ZCuSn10Pb1 Bronze

1. Same as above; 2. Damage from foreign debris ingress between bushing and axle.

1. Same as above; 2. Clean the bushing installation area before assembly to remove debris.

10

Rope buffling bar

YM-16Ⅱ DT-01.01.03

Rubber (High-Elasticity, Wear-Resistant) + Carbon Steel (Mounting Plate)

1. Rubber aging and cracking from long-term UV exposure; 2. Mounting plate loosening due to vibration.

1. Avoid direct sunlight; replace rubber parts every 12 months; 2. Re-torque mounting plate fasteners monthly.

11

Rope buffling bar

YM-16ⅡDT-01.01.03

Rubber (High-Elasticity) + Carbon Steel (Mounting Plate)

1. Rubber wear from wire rope friction; 2. Corrosion of mounting plate in humid environments.

1. Inspect rubber wear monthly; replace if wear depth exceeds 5mm; 2. Apply anti-corrosion coating to mounting plates annually.

12

Bearing 1000902

GB276-82

GCr15 Bearing Steel (High-Precision Rolling Elements)

1. Seizure due to lubrication contamination by dust and metal particles; 2. Fatigue damage from cyclic radial loads.

1. Use clean, high-quality bearing grease; install dust-proof seals; 2. Replace bearings every 2000 operating hours or if abnormal noise/vibration is detected.

1

Bolt M6x16

GB70-86

Carbon Steel 4.8 Grade (Zinc-Plated)

1. Thread wear from repeated assembly; 2. Corrosion of zinc plating in high-humidity environments.

1. Use thread lock compound during assembly; limit disassembly times to ≤20 times; 2. Inspect for corrosion monthly; replace if corrosion area exceeds 10%.

2

Bolt M10x12

GB5781-86

Carbon Steel 4.8 Grade (Zinc-Plated)

1. Deformation from over-tightening (torque >30N·m); 2. Fatigue fracture from vibration (vibration amplitude >0.1mm).

1. Tighten with a torque wrench (torque value: 20-25N·m); 2. Install spring gaskets to absorb vibration; inspect for cracks quarterly.

3

Locking bolt M12x25

GB79-85

Carbon Steel 8.8 Grade (Heat-Treated, Zinc-Plated)

1. Locking thread wear from repeated use; 2. Corrosion of bolt shank in drilling fluid environments.

1. Replace locking bolts every 12 months; 2. Apply anti-corrosion grease to the shank before installation.

4

Bolt M12x35

GB70-86

Carbon Steel 8.8 Grade (Zinc-Plated)

1. Fatigue fracture from cyclic load impact; 2. Thread damage from cross-threading during assembly.

1. Conduct MPT annually to detect fatigue cracks; 2. Align threads correctly during assembly; avoid cross-threading.

5

Bolt M10x2

GB5781-86

Carbon Steel 4.8 Grade (Zinc-Plated)

1. Loosening due to vibration; 2. Corrosion of head from environmental exposure.

1. Use lock washers; re-torque monthly; 2. Apply anti-corrosion paint to the bolt head.

6

Bolt M20x60

GB5782-86

Carbon Steel 8.8 Grade (Zinc-Plated)

1. High-load wear of thread; 2. Deformation of bolt shank from overloading.

1. Strictly comply with rated load limits; 2. Inspect thread wear quarterly; replace if wear is detected.

7

Bolt M10x25

GB5782-86

Carbon Steel 8.8 Grade (Zinc-Plated)

1. Vibration-induced loosening; 2. Zinc plating damage from improper handling.

1. Use thread lock compound; 2. Use proper tools to avoid scratching the zinc plating during installation.

8

Nut M10

GB6170-86

Carbon Steel 4.8 Grade (Zinc-Plated)

1. Thread wear from repeated assembly; 2. Corrosion in humid environments.

1. Replace nuts every 12 months or after 20 assembly cycles; 2. Store in a dry environment when not in use.

9

Nut M10

GB6170-86

Carbon Steel 4.8 Grade (Zinc-Plated)

1. Same as above; 2. Loosening due to spring gasket fatigue.

1. Same as above; 2. Replace spring gaskets together with nuts.

10

Nut N30

GB6170-86

Carbon Steel 8.8 Grade (Zinc-Plated)

1. High-torque thread wear; 2. Deformation from over-tightening.

1. Tighten with a torque wrench (follow rated torque values); 2. Inspect for deformation quarterly.

11

Nut

YM-16Ⅱ-04.03C

Alloy Steel (Heat-Treated)

1. Thread wear from rotational friction; 2. Corrosion from lubricating oil additives.

1. Lubricate threads with extreme-pressure grease; 2. Use lubricating oil compatible with the nut material.

12

Spring gasket 10

GB93-87

Carbon Steel 65Mn (Heat-Treated)

1. Fatigue deformation from repeated compression (compression cycles >1000 times); 2. Corrosion in humid environments.

1. Replace spring gaskets every 6 months; 2. Apply anti-rust oil before installation.

13

Spring gasket 10

GB93-87

Carbon Steel 65Mn

1. Same as above; 2. Fracture from over-compression (compression rate >40%).

1. Same as above; 2. Control compression rate between 20-30%.

14

Spring gasket 12

GB93-87

Carbon Steel 65Mn

1. Fatigue fracture from vibration; 2. Corrosion from drilling fluid splatter.

1. Replace every 6 months; 2. Clean regularly to remove drilling fluid residue.

15

Spring gasket 20

GB93-87

Carbon Steel 65Mn

1. Fatigue deformation from high-load compression; 2. Thermal aging from high-temperature environments (temperature >80℃).

1. Replace every 6 months in high-load scenarios; 2. Avoid use in environments above 80℃.

16

Spring gasket 30

GB93-87

Carbon Steel 65Mn

1. Fatigue fracture from high-load compression; 2. Corrosion of surface oxide layer.

1. Replace every 6 months; 2. Inspect oxide layer for damage monthly; reapply anti-rust oil if needed.

17

Column pin A16x60

GB119-86

Carbon Steel 45# (Quenched & Tempered)

1. Wear from rotational friction; 2. Corrosion in humid environments.

1. Lubricate with anti-wear grease monthly; 2. Apply anti-corrosion coating annually.

18

Oiling Cup M10x1

GB1152-79

Carbon Steel (Body) + Rubber (Seal Ring)

1. Seal ring aging and leakage; 2. Blockage of oil inlet by dust and debris.

1. Replace seal rings annually; 2. Clean oil inlet monthly; install dust-proof caps when not in use.

19

Oiling Cup M10x1

GB1152-79

Carbon Steel (Body) + Rubber (Seal Ring)

1. Same as above; 2. Corrosion of body in drilling fluid environments.

1. Same as above; 2. Clean body regularly to remove drilling fluid residue.

20

Oiling Cup M10x1

GB1152-86

Carbon Steel (Body) + Rubber (Seal Ring)

1. Same as above; 2. Damage from impact during maintenance.

1. Same as above; 2. Avoid impact during maintenance; handle with care.

21

Wedge

YM-16ⅡA-04.01

Alloy Steel (Quenched & Tempered)

1. Wear of wedge surface from frictional locking; 2. Deformation from high-pressure locking.

1. Lubricate wedge surface with anti-wear grease before use; 2. Inspect for deformation quarterly; replace if wear exceeds 0.2mm.

22

Baffle

YM-10-03.02

Carbon Steel Q235B (Zinc-Plated)

1. Corrosion of zinc plating; 2. Deformation from impact.

1. Inspect zinc plating for damage monthly; touch up with anti-corrosion paint; 2. Install anti-collision buffers to avoid impact.

23

Buffle

YM-10-03.02

Carbon Steel Q235B (Zinc-Plated)

1. Same as above; 2. Loosening of mounting fasteners due to vibration.

1. Same as above; 2. Re-torque mounting fasteners monthly.

24

Buffle

YM-16Ⅱ-03.02

Carbon Steel Q235B (Zinc-Plated)

1. Corrosion in humid environments; 2. Wear from wire rope friction.

1. Apply anti-corrosion coating annually; 2. Inspect for wear monthly; replace if wear is severe.

25

Travelling Block Shield

YM-16Ⅱ DT-01.01.01

Carbon Steel Q235B (Zinc-Plated)

1. Corrosion of surface; 2. Deformation from impact during transportation or maintenance.

1. Apply anti-corrosion coating annually; 2. Use specialized lifting fixtures during transportation; avoid impact during maintenance.

26

Travelling block seat

YM-16Ⅱ-02.01C

ZG35CrMo Cast Steel

1. Wear of mounting surface from long-term assembly; 2. Corrosion in drilling fluid environments.

1. Inspect mounting surface flatness quarterly; re-machine if deviation exceeds 0.1mm; 2. Clean surface regularly to remove drilling fluid residue.

27

Crown Block Seat

YM-16Ⅱ-03.01C

ZG35CrMo Cast Steel

1. Wear of mounting surface from long-term load-bearing; 2. Corrosion in high-humidity environments.

1. Inspect mounting surface wear monthly; re-machine if wear exceeds 0.1mm; 2. Apply anti-corrosion coating annually.

28

Connecting plate

YM-16Ⅱ-03.01

Carbon Steel Q355B (Welded)

1. Weld joint fatigue from vibration; 2. Corrosion of surface.

1. Conduct UT of weld joints annually; 2. Apply anti-corrosion coating annually.

29

Bearing seat

YM-16Ⅱ-04.01C

ZG35CrMo Cast Steel

1. Wear of bearing mounting hole; 2. Corrosion of internal surface from lubricating oil moisture.

1. Inspect mounting hole wear quarterly; replace if wear exceeds 0.05mm; 2. Monitor lubricating oil moisture content; use a dehydrator if needed.