BOMCO Drawworks JC Series Right Transmission Gear Case Parts

1

ZLYQE830-9.4A-102 Upper Cover

High-strength cast steel (ZG310-570), normalized heat treatment

1. Long-term vibration during drilling causes fatigue cracking at bolt holes; 2. Improper installation torque leads to uneven stress and deformation

1. Use a torque wrench to fasten bolts according to GB/T 1958-2004 torque specification; 2. Regularly inspect the sealing surface for scratches and clean it before assembly

2

ZLYQE830-9.4A-104 Plate

Medium carbon steel (45#), quenched and tempered treatment

1. Erosion of lubricating oil impurities leads to surface wear; 2. Thermal expansion and contraction under extreme temperature changes causes warpage

1. Replace lubricating oil according to BOMCO drawworks maintenance manual (standard No.: Q/BOMCO 001-2022); 2. Avoid direct high-temperature baking during equipment maintenance

3

ZLYQC850-9.4A-103 Plate

Medium carbon steel (45#), quenched and tempered treatment

1. Shear stress caused by misalignment of connected components leads to edge damage; 2. Corrosion caused by moisture intrusion into the gear case

1. Check the coaxiality of connected parts before installation (tolerance ≤ 0.02mm); 2. Ensure the O-ring seal of the gear case is intact to prevent moisture entry

4

ZLYQC850-9.4A-101 Lower Casing

High-strength cast steel (ZG340-640), aging treatment to eliminate internal stress

1. Impact damage caused by falling debris during on-site drilling operations; 2. Long-term load-bearing leads to fatigue deformation at the bottom

1. Install protective baffles during on-site operation in harsh environments; 2. Regularly check the flatness of the lower casing (allowable deviation ≤ 0.05mm/m)

1

ZFYQF890-9AA-004 Automatic Feed Driller Shaft Assembly

Alloy structural steel (40CrNiMoA), carburizing and quenching treatment

1. Abrasive wear caused by insufficient lubrication and presence of impurities in the oil; 2. Fatigue failure of the shaft neck due to alternating loads during long-term operation

1. Use lubricating oil that meets the standard of GB/T 30532-2014 and filter it regularly; 2. Monitor the vibration frequency of the shaft assembly (allowable range: 10-25Hz) to detect abnormal loads in time

2

ZLYQF8E0-9AA-003 Output Shaft Assembly

Alloy structural steel (42CrMo), quenched and tempered treatment

1. Wear of the spline connection due to improper alignment during installation; 2. Thermal fatigue cracking caused by frequent start-stop and temperature fluctuations

1. Ensure the spline fit clearance is within 0.03-0.08mm during installation; 2. Avoid frequent emergency start-stop of the drawworks and preheat the transmission system before operation in low-temperature environments

3

ZFYQF890-9AA-002 Counter Shaft Assembly

Alloy structural steel (35CrMo), carburizing and quenching treatment

1. Impact wear caused by sudden load changes during drilling; 2. Corrosion of the shaft surface due to water intrusion into the gear case

1. Stabilize the drilling load and avoid overloading the drawworks (rated load ≤ 90% of the maximum load); 2. Regularly inspect the sealing performance of the gear case and replace damaged seals in time

4

ZLYQF830-9AA-001 Input Shaft Assembly

Alloy structural steel (40Cr), quenched and tempered treatment

1. Wear of the bearing journal due to long-term high-speed rotation; 2. Shear damage of the keyway caused by excessive torque transmission

1. Regularly check the bearing wear status and replace bearings that have reached the service life (standard: Q/BOMCO 002-2022); 2. Avoid exceeding the rated torque of the input shaft (rated torque: refer to BOMCO drawworks technical parameters)

1

G-M90X2 E-Type Air Filter

Filter element: glass fiber; Housing: engineering plastic (PA66)

1. Clogging of the filter element due to excessive dust in the drilling environment; 2. Damage to the filter housing due to collision during transportation or installation

1. Clean or replace the filter element every 500 working hours (refer to GB/T 25984-2010 standard); 2. Handle with care during transportation and installation to avoid collision with hard objects

2

ZLYQE830-9.4A-338 Oil Separator

Separator element: stainless steel (304); Shell: carbon steel (Q235A) with anti-corrosion coating

1. Blockage of the separator element due to sludge accumulation in lubricating oil; 2. Corrosion of the shell due to long-term contact with acidic lubricating oil

1. Replace lubricating oil regularly and test the oil quality (acidity ≤ 0.1mgKOH/g); 2. Regularly inspect the anti-corrosion coating of the shell and touch up the paint if there is peeling

3

20X2 65XGB3A52 1-82 O ring seal 20X2.63

Nitrile rubber (NBR 70), oil-resistant and wear-resistant

1. Aging and hardening caused by long-term contact with high-temperature lubricating oil; 2. Cutting damage caused by burrs on the sealing groove during installation

1. Ensure the working temperature of the O-ring does not exceed 120℃; 2. Polish the sealing groove to remove burrs before installation (surface roughness Ra ≤ 0.8μm)

4

25X2.65XGB3A52.1-82 O ring seal 23X2.63

Nitrile rubber (NBR 70), oil-resistant and wear-resistant

1. Compression set caused by excessive compression during installation; 2. Damage caused by chemical corrosion of incompatible lubricating oil additives

1. Control the compression amount of the O-ring within 20-30% of the cross-sectional diameter; 2. Confirm that the lubricating oil additives are compatible with NBR rubber before use

5

387X7/GB3452.1-82 O ring seal 387X7

Fluoro rubber (FKM), high-temperature and chemical-resistant

1. Cracking caused by low-temperature brittleness in cold regions; 2. Wear caused by relative movement between the O-ring and the sealing surface

1. Preheat the O-ring to 10-20℃ before installation in low-temperature environments (below -20℃); 2. Apply a thin layer of compatible lubricating grease on the sealing surface before assembly

6

17SX3.S3/GB34S2.1-82 O ring seal 173X3.33

Nitrile rubber (NBR 70), oil-resistant and wear-resistant

1. Puncture damage caused by foreign particles in the sealing groove; 2. Aging caused by long-term exposure to sunlight during storage

1. Clean the sealing groove thoroughly before installation to remove foreign particles; 2. Store the O-rings in a cool, dry, and dark environment (storage temperature: 0-25℃)

7

224X3.3/GB3452.1-82 O ring seal 224X3.3

Nitrile rubber (NBR 70), oil-resistant and wear-resistant

1. Shear damage caused by improper installation tools; 2. Deterioration caused by contact with water in the gear case

1. Use special installation tools for O-rings to avoid direct prying with screwdrivers; 2. Regularly drain the water in the gear case (drain every 200 working hours)

8

430X7/GB3432.1-82 O ring seal 430X7

Fluoro rubber (FKM), high-temperature and chemical-resistant

1. Deformation caused by excessive pressure in the gear case; 2. Wear caused by uneven sealing surface

1. Monitor the internal pressure of the gear case (allowable pressure ≤ 0.3MPa); 2. Check the flatness of the sealing surface before installation (allowable deviation ≤ 0.03mm)

9

423X7/GB3452.1-82 O ring seal 423X7

Fluoro rubber (FKM), high-temperature and chemical-resistant

1. Cracking caused by thermal shock (sudden temperature rise and fall); 2. Damage caused by burrs on the mating parts

1. Avoid sudden heating of the gear case during maintenance; 2. Inspect the mating parts for burrs and polish them if necessary

10

230X3.3/FB3432.1-82 O ring seal 230X3.3

Nitrile rubber (NBR 70), oil-resistant and wear-resistant

1. Compression fatigue caused by long-term continuous operation; 2. Damage caused by incompatible cleaning agents during maintenance

1. Replace the O-ring every 1500 working hours or as recommended in the maintenance manual; 2. Use cleaning agents compatible with NBR rubber (avoid strong solvents such as acetone)

11

136X3.33/GB3432.1-82 O ring seal 136X3.33

Nitrile rubber (NBR 70), oil-resistant and wear-resistant

1. Puncture caused by sharp edges of the gear case; 2. Aging caused by high humidity in the working environment

1. Smooth the sharp edges of the gear case with a file; 2. Use a dehumidifier in the equipment room in high-humidity areas

12

236X3.3/FB3432.1-82 O ring seal 236X3.3

Nitrile rubber (NBR 70), oil-resistant and wear-resistant

1. Wear caused by vibration of the drawworks during operation; 2. Damage caused by improper storage (stacking pressure)

1. Check the vibration isolation device of the drawworks regularly; 2. Store the O-rings in a single layer without stacking pressure

13

412X7/GB3432.1-82 O ring seal 412X7

Fluoro rubber (FKM), high-temperature and chemical-resistant

1. Deterioration caused by contact with aging lubricating oil; 2. Damage caused by incorrect installation direction

1. Replace aging lubricating oil in time (oil change cycle: refer to BOMCO maintenance manual); 2. Confirm the installation direction of the O-ring according to the assembly drawing

14

363X7/GB3432.1-82 O ring seal 363X7

Fluoro rubber (FKM), high-temperature and chemical-resistant

1. Cracking caused by excessive bending during installation; 2. Wear caused by dust accumulation on the sealing surface

1. Install the O-ring without excessive bending (bending radius ≥ 5 times the cross-sectional diameter); 2. Clean the sealing surface with a clean cloth before installation

15

16SX3.S3/GB34S2.1-82 O ring seal 163X3.33

Nitrile rubber (NBR 70), oil-resistant and wear-resistant

1. Aging caused by long-term high-temperature operation; 2. Damage caused by foreign objects entering during installation

1. Ensure the working temperature does not exceed the maximum service temperature of NBR rubber (120℃); 2. Cover the sealing port with a protective film before installation to prevent foreign objects from entering

1

M12X40/GB/3783 Bolt

Carbon steel (8.8 grade), galvanized surface treatment

1. Loosening caused by vibration during drilling operation; 2. Corrosion of the bolt surface due to humid environment

1. Use spring washers and lock nuts to enhance anti-loosening performance; 2. Regularly inspect the bolt surface for corrosion and replace corroded bolts in time

2

M36X280/GB/T901 Bolt

Alloy steel (10.9 grade), quenched and tempered treatment

1. Tensile fatigue failure caused by long-term load-bearing; 2. Thread damage caused by improper tightening tools

1. Control the tightening torque according to GB/T 1958-2004 (recommended torque: 1200-1300N·m); 2. Use a torque wrench with accurate calibration (error ≤ ±3%) for tightening

3

M36/GB/T6170 Nut

Carbon steel (8 grade), galvanized surface treatment

1. Thread wear caused by repeated disassembly and assembly; 2. Deformation caused by excessive tightening torque

1. Avoid unnecessary repeated disassembly and assembly; 2. Do not exceed the maximum allowable tightening torque (1500N·m)

4

M36/GB/T6172.1 Nut

Carbon steel (8 grade), galvanized surface treatment

1. Corrosion of the nut surface due to contact with lubricating oil and water; 2. Loosening caused by insufficient pre-tightening force

1. Clean the nut surface after contact with lubricating oil; 2. Ensure sufficient pre-tightening force during installation (pre-tightening force: 800-900kN)

5

M16X30/GB/3783 Bolt

Carbon steel (8.8 grade), galvanized surface treatment

1. Shear damage caused by lateral force during vibration; 2. Thread slipping caused by over-tightening

1. Ensure the bolt is installed in the correct position to avoid lateral force; 2. Tighten the bolt to the specified torque (recommended torque: 80-90N·m)

6

16/GB93-87 Spring Washer

Carbon steel (65Mn), heat treatment

1. Fatigue failure caused by repeated compression and relaxation; 2. Deformation caused by improper installation

1. Replace the spring washer every time the bolt is disassembled and assembled; 2. Ensure the spring washer is installed in the correct direction (the opening faces the nut)

7

20/GB93-87 Spring Washer

Carbon steel (65Mn), heat treatment

1. Wear of the washer surface caused by friction with the bolt and nut; 2. Breakage caused by excessive compression

1. Check the surface of the washer for wear before installation; 2. Control the compression amount within 15-20% of the washer's thickness

8

M20X60/GB/3783 Bolt

Carbon steel (8.8 grade), galvanized surface treatment

1. Corrosion caused by humid and dusty environment; 2. Tensile damage caused by overloading

1. Apply anti-corrosion grease to the bolt surface in humid environments; 2. Do not use the bolt beyond its rated load (rated tensile load: 150kN)

9

M20X80/GB/3783 Bolt

Carbon steel (8.8 grade), galvanized surface treatment

1. Thread damage caused by foreign particles entering the thread; 2. Fatigue failure caused by alternating loads

1. Clean the thread before installation to remove foreign particles; 2. Regularly inspect the bolt for fatigue cracks (use magnetic particle inspection every 2000 working hours)

10

M30X200/GB/T901 Bolt

Alloy steel (10.9 grade), quenched and tempered treatment

1. Shaft neck wear caused by long-term high-speed rotation; 2. Shear damage of the keyway caused by excessive torque transmission

1. Regularly check the bearing wear status and replace bearings that have reached the service life (standard: Q/BOMCO 002-2022); 2. Avoid exceeding the rated torque of the input shaft (rated torque: refer to BOMCO drawworks technical parameters)

11

M30/GB/T6170 Nut

Carbon steel (8 grade), galvanized surface treatment

1. Thread corrosion caused by contact with lubricating oil; 2. Loosening caused by vibration

1. Clean the nut after use and apply anti-rust oil; 2. Use lock washers or thread locking glue to enhance anti-loosening performance

12

M30/GB/T6172.1 Nut

Carbon steel (8 grade), galvanized surface treatment

1. Deformation caused by uneven force during tightening; 2. Wear caused by repeated disassembly and assembly

1. Tighten the nut evenly in a cross pattern; 2. Replace the nut if there is obvious thread wear

13

30X80/GB/T120.1 Pin Shaft

Carbon steel (45#), quenched and tempered treatment

1. Wear caused by relative movement between the pin shaft and the hole; 2. Bending deformation caused by impact load

1. Apply lubricating oil between the pin shaft and the hole regularly; 2. Avoid impact loads on the pin shaft during operation

1

ZLYQF880-9AA-301 End Cover

Cast iron (HT250), precision machining

1. Wear of the bearing hole caused by long-term contact with the bearing; 2. Cracking caused by vibration during operation

1. Regularly check the fit clearance between the bearing hole and the bearing (allowable clearance: 0.01-0.03mm); 2. Install vibration damping pads between the end cover and the gear case

2

ZFYQF890-9AA-317 End Cover

Cast iron (HT250), precision machining

1. Corrosion caused by moisture and dust intrusion; 2. Deformation caused by uneven tightening of bolts

1. Ensure the sealing gasket of the end cover is intact to prevent moisture and dust intrusion; 2. Tighten the end cover bolts evenly in a cross pattern

3

ZFYQF890-9AB-322 End Cover

Cast iron (HT250), precision machining

1. Wear of the sealing surface caused by repeated disassembly and assembly; 2. Thermal deformation caused by temperature changes

1. Replace the sealing gasket every time the end cover is disassembled and assembled; 2. Avoid sudden temperature changes of the end cover during maintenance

4

ZLYQF850O4A-328 End Cover

Cast iron (HT250), precision machining

1. Damage caused by collision during transportation; 2. Thread wear of the bolt hole caused by repeated disassembly and assembly

1. Package the end cover with foam during transportation to avoid collision; 2. Use thread repair kits to repair worn bolt holes if necessary

5

ZFYQF830-9AA-339 End Cover

Cast iron (HT250), precision machining

1. Erosion of the surface by lubricating oil impurities; 2. Cracking caused by excessive torque during installation

1. Regularly replace lubricating oil and filter impurities; 2. Control the installation torque of the end cover bolts (recommended torque: 300-350N·m)

6

ZFYQF830O4A-338 Partition Sleeve

Alloy steel (40Cr), quenched and tempered treatment

1. Wear caused by relative movement between the partition sleeve and the shaft; 2. Deformation caused by excessive interference during installation

1. Apply lubricating grease between the partition sleeve and the shaft; 2. Ensure the interference fit between the partition sleeve and the shaft is within the range of 0.02-0.05mm

7

ZFYQF890-9AA-344 Partition Sleeve

Alloy steel (40Cr), quenched and tempered treatment

1. Fatigue wear caused by long-term vibration; 2. Corrosion caused by contact with water in the gear case

1. Check the partition sleeve for wear every 1000 working hours; 2. Regularly drain the water in the gear case to prevent corrosion

8

ZFYQF890-9AA-342 End Cover

Cast iron (HT250), precision machining

1. Wear of the end face caused by friction with other components; 2. Cracking caused by thermal fatigue

1. Check the end face flatness regularly (allowable deviation ≤ 0.04mm); 2. Avoid frequent start-stop of the drawworks to reduce thermal fatigue

9

ZFYQF850O4A-348 End Cover

Cast iron (HT250), precision machining

1. Damage caused by foreign objects hitting during on-site operation; 2. Thread slipping of the bolt hole caused by over-tightening

1. Install a protective cover on the end cover during on-site operation; 2. Use a torque wrench to tighten the bolts to the specified torque

10

ZFYQF830-9AA-333 Bearing House

Cast steel (ZG310-570), normalized heat treatment

1. Wear of the bearing seat caused by long-term bearing operation; 2. Deformation caused by uneven load distribution

1. Regularly inspect the bearing seat for wear and replace the bearing in time if wear is found; 2. Ensure the load is evenly distributed on the bearing house during installation

11

ZLYQE790-8.2-312 End Cover

Cast iron (HT250), precision machining

1. Corrosion caused by harsh on-site environment; 2. Damage caused by improper installation

1. Apply anti-corrosion paint to the end cover surface; 2. Follow the assembly drawing for installation to ensure correct positioning