BOMCO Drawworks JC Series Reducing Mechanism Parts

1

GK187-02 Cover plate

High-strength cast steel (ZG310-570), normalized heat treatment to eliminate internal stress

1. Fatigue cracking at bolt holes due to long-term cyclic vibration; 2. Deformation caused by uneven tightening torque during assembly

1. Tighten bolts in a cross pattern with calibrated torque wrench (torque: 85-95N·m) per GB/T 1958-2004; 2. Inspect for cracks with magnetic particle inspection every 1800 working hours

2

GK187-01-BC Case

High-strength cast iron (HT300), aging treatment to enhance dimensional stability

1. Impact damage from falling debris during on-site drilling operations; 2. Corrosion of inner cavity due to moisture intrusion and lubricating oil oxidation

1. Install protective baffles around the case in harsh operation areas; 2. Replace lubricating oil per BOMCO maintenance standard Q/BOMCO 004-2024 and drain condensation every 250 working hours

3

GK187-10 Cover plate

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

1. Wear of sealing surface due to repeated disassembly and assembly; 2. Warpage caused by thermal shock during maintenance (sudden heating/cooling)

1. Replace sealing gaskets every time the cover plate is disassembled; 2. Avoid direct high-temperature baking during maintenance, control temperature change ≤ 5℃/min

4

GK187-12 Adjust plate

Medium carbon steel (45#), quenched and tempered treatment (hardness HRC 35-40)

1. Wear of adjustment surface due to frequent position adjustment; 2. Bending deformation caused by excessive adjustment force

1. Apply a thin layer of anti-wear lubricating grease on the adjustment surface; 2. Use torque wrench to control adjustment force, avoiding overloading (maximum force: 1.2×rated load)

5

GK187-11 Adjust plate

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

1. Corrosion caused by humid and dusty on-site environment; 2. Thread damage of fixing holes due to repeated assembly

1. Apply anti-corrosion paint to exposed surfaces; 2. Use thread repair inserts (complying with GB/T 197-2003) for worn holes to avoid forced assembly

6

GK187-09 Gland

Alloy steel (40Cr), quenched and tempered treatment

1. Deformation caused by uneven pressure during oil seal installation; 2. Wear of inner hole due to long-term contact with rotating shaft

1. Install oil seal with special tools to ensure uniform pressure; 2. Check inner hole surface roughness (Ra ≤ 0.8μm) regularly, polish if worn

7

GK187-19-HB Gland

Alloy steel (40Cr), quenched and tempered treatment

1. Fatigue cracking due to long-term vibration; 2. Damage caused by improper storage (stacking pressure)

1. Check for vibration-induced cracks monthly; 2. Store glands flat, avoiding stacking heavy objects on top

8

GK187-13 Gland

Alloy steel (40Cr), quenched and tempered treatment

1. Erosion of inner surface by lubricating oil impurities; 2. Corrosion caused by water intrusion into the mechanism

1. Ensure lubricating oil filtration precision (10μm) per GB/T 25984-2010; 2. Inspect the sealing system regularly to prevent water ingress

1

GK187-06/74m8 Gear III

Alloy structural steel (20CrMnTi), carburizing and quenching (hardness HRC 58-62), precision grinding

1. Abrasive wear on tooth surfaces due to contaminated lubricating oil with metal particles; 2. Fatigue pitting of teeth caused by long-term alternating loads

1. Replace lubricating oil regularly and use high-efficiency oil filters; 2. Monitor gear meshing noise (allowable ≤ 82dB) and vibration (allowable ≤ 2.5mm/s) to detect abnormal wear early

2

TC1-5/20m3D38 Pinion gear

Alloy structural steel (20CrMnTi), carburizing and quenching

1. Tooth root cracking due to sudden load changes during drilling; 2. Wear of tooth surface due to improper meshing clearance

1. Avoid emergency start-stop of drawworks to prevent torque spikes; 2. Adjust meshing clearance to 0.25-0.35mm per gear assembly standard

3

GK187-07-HB Output shaft

Alloy steel (42CrMo), quenched and tempered treatment (hardness HRC 28-32)

1. Wear of journal due to long-term bearing operation; 2. Bending deformation caused by uneven load distribution

1. Check journal wear regularly (allowable wear ≤ 0.03mm); 2. Ensure bearing installation is concentric, coaxiality tolerance ≤ 0.02mm

4

GK187-05/llm8 Gear shaft I

Alloy steel (40CrNiMoA), carburizing and quenching

1. Thermal fatigue cracking of shaft neck due to frequent temperature fluctuations; 2. Shear damage of keyway caused by excessive torque

1. Preheat the mechanism before operation in low-temperature environments (-10℃ and below); 2. Avoid overloading the drawworks, ensure torque ≤ rated torque

5

GK187-04/34/34m13.3 Gear

Alloy structural steel (20CrMnTi), carburizing and quenching

1. Tooth wear caused by insufficient lubrication; 2. Corrosion of tooth surface due to lubricating oil oxidation

1. Maintain lubricating oil level within the specified range (per sight glass); 2. Test lubricating oil quality regularly (acidity ≤ 0.1mgKOH/g), replace if deteriorated

6

TC2-2/128m 3D80 Input shaft passive gear

Alloy structural steel (20CrMnTi), carburizing and quenching

1. Impact wear of teeth due to uneven input power; 2. Wear of gear bore due to relative rotation with shaft

1. Stabilize input power to avoid sudden fluctuations; 2. Ensure interference fit between gear and shaft is within 0.02-0.05mm per GB/T 1184-1996

7

GK187-03/8m13.3 Gear shaft

Alloy steel (40CrNiMoA), carburizing and quenching

1. Wear of shaft surface due to contaminated lubricating oil; 2. Deformation caused by external impact during maintenance

1. Keep lubricating oil clean, particle count ≤ 16/13 per ISO 4406; 2. Handle with care during maintenance, avoid collision with hard objects

8

GK187-08 Shaft sleeve

Alloy steel (40Cr), quenched and tempered treatment

1. Abrasive wear due to relative movement with shaft; 2. Deformation caused by excessive interference during installation

1. Apply anti-wear lubricating grease between shaft sleeve and shaft; 2. Control installation interference within the specified range to avoid plastic deformation

1

GB5783-86/M16X40 Bolt M16X40

Alloy steel (8.8 grade), galvanized for corrosion resistance

1. Loosening caused by resonant vibration during drilling; 2. Tensile fatigue failure due to over-tightening

1. Use spring washers and thread locking adhesive (complying with GB/T 14074-2017) for anti-loosening; 2. Tighten to specified torque (85-95N·m) with calibrated torque wrench

2

GB93-87/16 Spring washer 16

Carbon steel (65Mn), heat treatment (hardness HRC 42-48)

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

1. Replace spring washers every time bolts are disassembled; 2. Ensure washers are installed in the correct direction (opening faces the nut)

3

GB70-85/M16X40 Nut M16X40

Carbon steel (8 grade), galvanized for corrosion resistance

1. Thread wear due to repeated assembly and disassembly; 2. Corrosion of thread in humid environment

1. Avoid unnecessary repeated disassembly; 2. Clean threads and apply anti-corrosion grease in humid environments

4

GB93-87 Spring washer 16

Carbon steel (65Mn), heat treatment

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

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

5

GB5783-86/M16X40 Bolt M16X40 (Duplicate)

Alloy steel (8.8 grade), galvanized for corrosion resistance

1. Corrosion of bolt surface due to contact with lubricating oil and water; 2. Thread damage caused by foreign particles during assembly

1. Clean bolt surface after contact with lubricating oil; 2. Remove foreign particles from threads before installation

6

GB93-87 Spring washer 16 (Duplicate)

Carbon steel (65Mn), heat treatment

1. Fatigue cracking at the opening due to long-term vibration; 2. Deformation caused by uneven force during tightening

1. Inspect washers for cracks regularly; 2. Tighten bolts evenly in a cross pattern to ensure uniform force

7

GB810A-88 Nut M72X2

Alloy steel (10.9 grade), quenched and tempered treatment

1. Tensile deformation caused by excessive tightening torque; 2. Thread corrosion caused by harsh on-site environment

1. Tighten to specified torque (1200-1300N·m) per GB/T 1958-2004; 2. Apply anti-corrosion paint to the nut surface after installation

8

GB855-88 Stopping washer for nut 72

Carbon steel (Q235A), heat treatment

1. Wear of locking teeth due to repeated use; 2. Deformation caused by improper bending during installation

1. Replace the stopping washer if locking teeth are worn; 2. Bend the locking teeth properly to avoid excessive force

1

GB/T1096-1979 Key_B50X160

Medium carbon steel (45#), quenched and tempered treatment (hardness HRC 35-40)

1. Shear failure caused by sudden torque increase; 2. Wear of key and keyway due to long-term vibration

1. Avoid overloading the drawworks to prevent torque exceeding the rated value; 2. Check key and keyway fit regularly, ensure clearance is within 0.01-0.03mm

2

GK187-15 Key 45X300

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

1. Bending deformation caused by uneven torque transmission; 2. Corrosion caused by moisture intrusion into the keyway

1. Ensure uniform torque transmission by checking gear meshing status; 2. Apply anti-corrosion grease in the keyway during assembly

3

GB/51096-1979 Key-B 25X100

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

1. Wear of key surface due to relative movement with keyway; 2. Damage caused by improper installation (hammering)

1. Apply lubricating grease on the key surface before installation; 2. Use a press to install the key instead of hammering

4

GB/T1096-1979 Key-B 22X70

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

1. Fatigue wear caused by long-term alternating loads; 2. Corrosion caused by lubricating oil oxidation

1. Replace lubricating oil regularly to prevent oxidation; 2. Inspect the key for wear every 1500 working hours

5

GB/T297-94 Bearing 32044

Bearing steel (GCr15), heat treatment; cage: brass

1. Seizure caused by insufficient lubrication; 2. Raceway damage caused by metal particles in lubricating oil

1. Fill with high-temperature grease (complying with GB/T 7324-2019) before installation; 2. Use lubricating oil filters with 10μm precision to remove impurities

6

GB/T297-1994 Bearing 32318

Bearing steel (GCr15), heat treatment; cage: steel

1. Overheating and damage due to improper preload; 2. Corrosion caused by water intrusion

1. Set preload according to the bearing manufacturer's specifications; 2. Ensure the sealing system is intact to prevent water ingress

7

GB/T297-1994 Bearing 30319

Bearing steel (GCr15), heat treatment; cage: steel

1. Rolling element wear due to long-term high-speed rotation; 2. Damage caused by impact during maintenance

1. Monitor bearing temperature during operation (allowable ≤ 95℃); 2. Handle with care during maintenance, avoid impact

8

GB/T297-1994 Bearing 32319 (Duplicate)

Bearing steel (GCr15), heat treatment; cage: steel

1. Fatigue failure of rolling elements due to long-term alternating loads; 2. Corrosion caused by humid environment

1. Check bearing vibration regularly (allowable ≤ 2.8mm/s); 2. Keep the mechanism dry and well-ventilated

9

HG4-338-66 Oil seal TC 210X250X16

Rubber: nitrile rubber (NBR 70); skeleton: carbon steel (Q235A)

1. Aging and hardening of rubber caused by high temperature; 2. Wear of sealing lip due to contaminated lubricating oil

1. Ensure operating temperature does not exceed 120℃; 2. Maintain lubricating oil cleanliness to avoid scratches on the sealing lip

1

Sight glass M33X1.5

Glass: tempered borosilicate glass; Housing: carbon steel (Q235A), galvanized

1. Cracking caused by impact from foreign objects; 2. Fogging of glass due to moisture intrusion

1. Install a protective cover around the sight glass; 2. Check the sealing gasket regularly, replace if damaged

2

TB06-09H/38H Motor input assembly

Shaft: alloy steel (40Cr); Housing: cast iron (HT250)

1. Wear of coupling surface due to long-term rotation; 2. Corrosion of housing due to harsh on-site environment

1. Apply lubricating grease on the coupling surface regularly; 2. Apply anti-corrosion paint to the housing surface

3

Plug M33X2

Carbon steel (Q235A), galvanized for corrosion resistance

1. Thread wear due to repeated disassembly and assembly; 2. Leakage caused by damaged sealing washer

1. Use thread sealant during installation; 2. Replace the sealing washer every time the plug is disassembled

4

EF-3-40 Air Filter

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

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

1. Clean or replace the filter element every 500 working hours per GB/T 25984-2010; 2. Use shock-absorbing packaging during transportation