Bomco Drawworks Spare Parts List

1

AF400116-00

Gearbox auxiliary transmission component

Alloy steel 42CrMo (quenched & tempered, surface nitrided); Precision machined

1. Abrasive wear caused by metal particles contaminating the lubricating oil entering the contact surface; 2. Fatigue pitting on the working surface due to long-term cyclic load transmission.

1. Maintain lubricating oil cleanliness (comply with NAS 7 class standard), replace oil filters every 500 operating hours; 2. Conduct magnetic particle inspection (MPI) every 12 months to detect surface fatigue cracks; 3. Avoid overloading the drawworks to reduce excessive torque on the component.

2

AF400118-00

Hydraulic control valve core

Stainless steel 17-4PH; Precision ground (surface roughness Ra ≤ 0.2μm); Seal groove with anti-corrosion coating

1. Sticking and wear caused by hydraulic oil contamination with impurities; 2. Corrosion of the valve core surface due to moisture ingress in the hydraulic system.

1. Use hydraulic oil that meets Bomco's specified grade, and replace it every 1000 operating hours; 2. Install a high-precision filter (5μm) in the hydraulic circuit; 3. Regularly drain water from the hydraulic oil tank to maintain oil dryness.

3

AF400121-00

Transmission shaft coupling component

Alloy steel 20CrMnTi (carburized & quenched); Connecting surface with spline precision machining

1. Spline wear caused by misalignment of the transmission shaft leading to uneven force; 2. Elastic fatigue of the connecting part due to frequent start-stop impact.

1. Check and adjust the coaxiality of the transmission shaft (allowable deviation ≤ 0.1mm) during maintenance; 2. Operate the drawworks smoothly to reduce start-stop impact; 3. Lubricate the spline surface with molybdenum disulfide grease every 300 operating hours.

4

AF400122-00

Lubrication system distributor

Aluminum alloy 6061-T6 (anodized); Internal valve core: Brass alloy; Seal: Fluororubber (Viton)

1. Clogging of internal oil channels caused by sludge accumulation in lubricating oil; 2. Seal aging and leakage due to high-temperature radiation from the drawworks gearbox.

1. Clean the oil distributor every 6 months to remove internal sludge; 2. Replace the fluororubber seal every 12 months; 3. Install a heat shield between the distributor and the gearbox to reduce high-temperature impact.

5

AF400123-00

Brake system pressure plate component

Alloy steel 40Cr (quenched & tempered); Friction contact surface with wear-resistant coating

1. Uneven wear of the contact surface caused by brake disc misalignment; 2. Thermal fatigue cracking due to rapid temperature rise during frequent braking.

1. Check the flatness of the brake disc (allowable deviation ≤ 0.2mm) and adjust if necessary; 2. Avoid frequent emergency braking to reduce thermal shock; 3. Inspect the pressure plate for cracks using penetrant testing (PT) every 8 months.

6

AF400124-00

Gearbox speed sensor bracket

Carbon steel Q235B (surface galvanized); Mounting hole with thread rolling processing

1. Thread wear and loosening caused by long-term drawworks vibration; 2. Corrosion of the bracket body due to drilling fluid splashing in the offshore/onshore environment.

1. Apply anti-loosening thread lock compound (Loctite 243) during installation; 2. Tighten the mounting bolts monthly and re-mark the locking position; 3. Apply anti-corrosion paint to the bracket surface annually, especially in offshore environments.

7

AF400303-00

Hydraulic cylinder piston rod

Alloy steel 30CrNiMo8 (quenched & tempered); Surface chrome-plated (thickness ≥ 0.05mm); Precision ground

1. Chrome layer peeling caused by impact from foreign objects; 2. Wear of the rod surface due to insufficient lubrication of the seal ring.

1. Install a protective sleeve at the rod end to prevent foreign object impact; 2. Apply a thin layer of hydraulic oil-compatible lubricant to the rod surface before installing the seal; 3. Regularly inspect the chrome layer for peeling, and re-plate if damage is found.

8

AF400305-00

Transmission gear auxiliary bearing

Inner/outer ring: Bearing steel GCr15; Rolling elements: GCr15; Cage: Brass

1. Bearing raceway wear caused by insufficient lubrication; 2. Cage damage due to metal particles entering the bearing interior.

1. Ensure sufficient lubricating oil supply to the bearing, check the oil circuit every 200 operating hours; 2. Replace the gearbox lubricating oil and filter according to the maintenance schedule; 3. Monitor bearing temperature (normal ≤ 70℃), stop immediately if overheating occurs.

9

AF400306-00

Lubricating oil pump impeller

Engineering plastic PEEK (high-temperature resistant); Reinforcement layer: Glass fiber

1. Impeller blade wear caused by solid particles in the lubricating oil; 2. Deformation of the impeller due to excessive temperature of the lubricating oil (exceeding 120℃).

1. Use lubricating oil that meets the specified viscosity and temperature range; 2. Install a pre-filter at the oil pump inlet to prevent large particles from entering; 3. Regularly inspect the impeller for wear and deformation, replace if necessary.

10

AF400307-00

Brake caliper guide pin

Stainless steel 316L; Surface polished; Corrosion-resistant coating

1. Jamming and wear caused by dust and brake dust accumulation; 2. Corrosion in humid and corrosive offshore environments.

1. Clean the guide pin and apply high-temperature anti-corrosion grease every 3 months; 2. Install a dust cover on the caliper to prevent dust ingress; 3. Regularly inspect the guide pin for smooth movement, and replace if stuck.

1

AF700115-00

Main gearbox driving gear

Alloy steel 20CrNi2Mo (carburized & quenched); Gear teeth precision ground (grade 6); Surface shot peening

1. Gear tooth wear and gluing caused by insufficient lubrication under heavy load; 2. Fatigue cracking of tooth roots due to long-term alternating load.

1. Use high-pressure gear oil (API GL-5) that meets Bomco's requirements; 2. Conduct ultrasonic testing (UT) on gear teeth every 18 months to detect internal fatigue; 3. Strictly abide by the rated load of the drawworks, prohibit overload operation.

2

AF700116-00

Drum assembly locking sleeve

Alloy steel 42CrMo (quenched & tempered); Internal thread precision machined; Surface phosphating

1. Thread wear and stripping caused by frequent drum locking and unlocking; 2. Loosening caused by drawworks vibration leading to reduced locking torque.

1. Apply anti-loosening thread lock compound (Loctite 603) during assembly; 2. Check the locking torque monthly with a torque wrench (comply with Bomco's specified value); 3. Replace the locking sleeve if thread wear exceeds 0.1mm.

3

AF700204-00

Emergency brake friction disc

Base plate: Carbon steel Q355B; Friction material: Ceramic fiber composite (high-temperature resistant ≥ 350℃)

1. Friction material wear and ablation under high-temperature emergency braking; 2. Delamination of friction material from the base plate due to thermal shock.

1. Replace the friction disc when the friction material thickness is less than 3mm; 2. Minimize emergency braking, adopt graded braking to reduce thermal shock; 3. Check the bonding quality of friction material and base plate every 6 months.

4

AF700213-00

Main shaft bearing seat

Cast iron HT300 (normalized); Bearing mounting hole precision bored; Surface painted with anti-corrosion paint

1. Wear of the bearing mounting hole caused by bearing outer ring rotation; 2. Corrosion and cracking caused by moisture and drilling fluid intrusion.

1. Ensure the interference fit between the bearing and the mounting hole meets the specification; 2. Strengthen the sealing of the bearing seat to prevent moisture ingress; 3. Inspect the bearing seat for cracks using MPI every 12 months.

5

AF700214-00

Hydraulic system relief valve core

Stainless steel 304; Valve seat: Carbide; Surface lapped (flatness ≤ 0.001mm)

1. Valve core wear caused by high-pressure fluid scouring; 2. Sticking caused by hydraulic oil contamination with impurities.

1. Maintain hydraulic oil cleanliness (NAS 6 class standard), replace the high-pressure filter every 800 operating hours; 2. Regularly calibrate the relief valve pressure (comply with Bomco's system pressure requirements); 3. Disassemble and clean the valve core every 12 months.

6

AF700215-00

Drum rope guide component

Alloy steel 40CrNiMoA (quenched & tempered); Rope contact surface with wear-resistant welding layer

1. Wear of the rope contact surface caused by long-term friction with the steel wire rope; 2. Deformation caused by steel wire rope deviation impact.

1. Regularly inspect the wear condition of the contact surface, re-weld the wear-resistant layer when wear exceeds 2mm; 2. Adjust the rope guide device to ensure the steel wire rope is evenly arranged; 3. Lubricate the steel wire rope regularly to reduce friction wear.

7

AF700216-00

Transmission system universal joint

Alloy steel 20CrMnTi (carburized & quenched); Cross shaft: 40Cr; Needle bearing: GCr15

1. Needle bearing wear caused by insufficient lubrication; 2. Cross shaft fatigue fracture due to excessive angle of rotation.

1. Inject lithium-based grease into the universal joint every 200 operating hours; 2. Control the maximum rotation angle of the universal joint within 30 degrees; 3. Regularly inspect the cross shaft for cracks using MPI, replace if necessary.

8

AF700218-00

Brake system hydraulic cylinder

Cylinder body: 27SiMn alloy steel (honored & nitrided); Piston: Aluminum alloy; Seal: Fluororubber

1. Inner wall wear caused by contamination particles in the hydraulic oil; 2. Seal leakage due to high-pressure impact and aging.

1. Replace hydraulic oil every 1000 operating hours, and clean the oil tank; 2. Replace the seal kit every 12 months or if leakage is found; 3. Avoid excessive pressure impact on the hydraulic cylinder, use pressure relief valves for protection.

9

AF700310-00

Gearbox oil sump

Carbon steel Q235B (welded & stress-relieved); Surface painted with epoxy anti-corrosion paint; Oil drain plug: Stainless steel

1. Welding seam corrosion and leakage caused by moisture and oil contamination; 2. Deformation of the sump caused by external impact during transportation and maintenance.

1. Inspect the welding seam for leakage every 3 months, repair with welding if necessary; 2. Avoid impact on the oil sump during on-site operations; 3. Clean the oil sump and replace the anti-corrosion paint every 2 years.

10

AF700313-00

Main power input shaft

Alloy steel 40CrNiMoA (quenched & tempered); Shaft journal precision ground; Keyway: Surface quenched

1. Shaft journal wear caused by bearing friction; 2. Keyway fatigue damage caused by high torque transmission.

1. Ensure the bearing is properly lubricated, replace the bearing if it is worn; 2. Check the fit between the key and keyway, replace if there is excessive play (＞0.05mm); 3. Conduct UT on the shaft every 18 months to detect internal fatigue.