Parts for 3NB1000C Mud Pump

1

Slush pump

107.14.00

High-strength alloy steel (main body) + gray cast iron (auxiliary structure)

1. Cyclic pressure impact from drilling fluid; 2. Internal component wear (e.g., pinion shaft/crosshead) reducing overall performance; 3. Corrosion from acidic/alkaline drilling media.

1. Conduct pressure tests per GB/T 5657-2013; 2. Use compatible drilling fluid to avoid corrosion; 3. Inspect core assemblies quarterly for wear.

2

Pinion shaft & crosshead assy

107.14.10.00

Alloy steel (40Cr, quenched & tempered for shaft; 45# steel for crosshead)

1. High torque impact during startup/shutdown; 2. Friction wear between shaft and bush; 3. Misalignment leading to uneven stress distribution.

1. Verify coaxiality before installation; 2. Maintain sufficient lubrication to reduce friction; 3. Avoid sudden overload to prevent deformation.

3

Crosshead center & LH

107.14.20.19

45# steel (carburized and quenched)

1. Wear from reciprocating motion; 2. Lack of lubrication causing metal-to-metal friction; 3. Impact damage from improper assembly.

1. Ensure proper lubrication before operation; 2. Check fit clearance during assembly; 3. Replace if excessive wear (beyond GB/T 3811-2008 standards).

4

Crosshead Left

107.14.20.19

45# steel (carburized and quenched)

1. Reciprocating friction leading to surface wear; 2. Contamination by debris causing abrasive wear; 3. Stress concentration at edges.

1. Clean assembly area to avoid debris; 2. Inspect surface roughness regularly; 3. Lubricate with high-temperature resistant lubricant.

5

Crosshead right

—

45# steel (carburized and quenched)

1. Wear from reciprocating motion; 2. Misalignment causing uneven stress; 3. Corrosion from lubricant contamination.

1. Align with crosshead center during installation; 2. Replace lubricant regularly to avoid contamination; 3. Check for deformation monthly.

6

Crosshead center & R.H

—

45# steel (carburized and quenched)

1. Abrasive wear from debris; 2. Fatigue damage from long-term reciprocation; 3. Lack of lubrication causing seizing.

1. Install a filter to prevent debris intrusion; 2. Conduct non-destructive testing quarterly; 3. Ensure lubricant flow to all contact surfaces.

7

Crosshead pin

107.14.20.11

Alloy steel (40CrNiMoV)

1. Shear stress from reciprocating load; 2. Wear at contact points with crosshead; 3. Corrosion from humid environments.

1. Check shear strength regularly; 2. Apply anti-rust coating to exposed surfaces; 3. Ensure proper fit with pin retainer.

8

Shaft

107.14.10.06

Alloy steel (40Cr, quenched & tempered)

1. Fatigue cracking from long-term torque; 2. Journal wear due to lubricant contamination; 3. Misalignment causing uneven wear.

1. Replace lubricant every 800 working hours; 2. Check journal surface for wear; 3. Verify coaxiality during maintenance.

9

Righ Hand gear

107.14.10.07

Alloy steel (20CrMnTi, carburized)

1. Gear tooth wear from meshing friction; 2. Impact loading during startup; 3. Lubricant deficiency causing scuffing.

1. Ensure proper gear meshing clearance; 2. Use extreme pressure lubricant; 3. Inspect tooth surface for pitting regularly.

10

Left-hand gear

107.14.10.09

Alloy steel (20CrMnTi, carburized)

1. Tooth wear from continuous meshing; 2. Debris intrusion causing abrasive damage; 3. Fatigue failure from cyclic load.

1. Clean gear box regularly; 2. Replace if tooth wear exceeds 10% of tooth thickness; 3. Maintain stable operating speed.

1

Bearing

CG154734HU (Ø170*260*92)

High-carbon chromium bearing steel (GCr15)

1. Lubricant contamination causing abrasive wear; 2. Overheating from insufficient lubrication; 3. Misalignment leading to uneven load.

1. Use clean, compatible lubricant; 2. Check temperature during operation (not exceeding 80°C); 3. Ensure proper installation with press fit.

2

Bearing

CG32840HU (200x320x88.9)

High-carbon chromium bearing steel (GCr15)

1. Fatigue damage from long-term heavy load; 2. Debris intrusion causing raceway wear; 3. Corrosion from humid environments.

1. Install a dust cover to prevent debris; 2. Conduct vibration analysis monthly; 3. Store in a dry, clean environment before use.

3

Bearing cage

107.14.10.04

Engineering plastic (PA66) + steel reinforcement

1. Wear from contact with bearing rollers; 2. High temperature causing material aging; 3. Impact damage during disassembly.

1. Avoid overheating during operation; 2. Disassemble gently to prevent damage; 3. Replace if cracks or deformation occur.

4

Bearing cover

107.14.10.02

Carbon steel (Q235B)

1. Corrosion from on-site environment; 2. Deformation from uneven bolt torque; 3. Wear from bearing rotation.

1. Tighten bolts evenly per torque standard; 2. Apply anti-rust paint to exposed surfaces; 3. Inspect for cracks monthly.

1

Oil seal

D7-1-67 (220x260x18)

Nitrile rubber (NBR 70) + steel skeleton

1. Aging from high temperature and lubricant; 2. Wear from shaft rotation; 3. Debris causing lip damage.

1. Replace every 600 working hours; 2. Clean shaft surface before installation; 3. Avoid sharp edges contacting the seal lip.

2

Seal

D4-4-66 (330x5.7)

Fluororubber (FKM) for high temperature resistance

1. Chemical corrosion from lubricant additives; 2. Compression deformation from over-tightening; 3. High temperature causing material degradation.

1. Ensure proper compression during installation; 2. Use compatible lubricant; 3. Avoid operating beyond 120°C.

3

Gasket

107.14.10.05 (61)

Asbestos-free rubber

1. High temperature aging; 2. Pressure damage from over-tightening; 3. Oil corrosion leading to brittleness.

1. Do not over-tighten bolts; 2. Replace after disassembly; 3. Avoid contact with high-temperature components.

4

Gasket

107.14.10.03

Asbestos-free rubber

1. Vibration causing edge wear; 2. Moisture leading to softening; 3. Improper storage causing deformation.

1. Store in sealed packaging; 2. Check for deformation before installation; 3. Ensure mating surfaces are clean.

5

Gasket

107.14.10.10

Asbestos-free rubber

1. Chemical corrosion from drilling fluid; 2. Compression fatigue from long-term use; 3. Installation misalignment causing leakage.

1. Clean mating surfaces before installation; 2. Replace every 600 working hours; 3. Avoid contact with drilling fluid.

6

Gasket

—

Asbestos-free rubber

1. Aging from long-term storage; 2. Damage during installation; 3. Compression fatigue under high pressure.

1. Use fresh gaskets for installation; 2. Handle gently to avoid tearing; 3. Ensure proper fit with mating components.

7

Gasket

—

Asbestos-free rubber

1. Wear from vibration; 2. Corrosion from lubricant; 3. Improper installation causing uneven compression.

1. Install evenly to ensure uniform compression; 2. Replace lubricant regularly; 3. Check for leakage after installation.

8

Oil conductor

107.15.20.20 (Ø20*2 L=30)

Seamless steel tube (20#)

1. Blockage from oil impurities; 2. Wear from vibration friction; 3. Corrosion from lubricant additives.

1. Flush regularly to remove impurities; 2. Secure to reduce vibration; 3. Replace if blockage or corrosion occurs.

9

Oil box

107.14.11.00

Galvanized steel

1. Corrosion from moisture in oil; 2. Welding seam leakage from vibration; 3. Internal scaling affecting oil quality.

1. Keep sealed to prevent moisture intrusion; 2. Clean internal scaling annually; 3. Inspect welding seams for cracks.

1

Screw

107.06.20.38 M20x60

Alloy steel (8.8 grade)

1. Thread wear from frequent disassembly; 2. Fatigue failure from long-term vibration; 3. Corrosion from on-site environment.

1. Torque to standard values during installation; 2. Apply thread lock to prevent loosening; 3. Inspect threads for damage before use.

2

Screw

GB32.1-88 (M12x25)

Carbon steel (8.8 grade)

1. Vibration causing loosening and thread wear; 2. Corrosion from humid environment; 3. Over-tightening causing shank deformation.

1. Use a torque wrench for installation; 2. Apply anti-rust coating; 3. Check tightness weekly.

3

Bolt

GB5783-86 (M20x50)

Alloy steel (8.8 grade)

1. Fatigue fracture from cyclic load; 2. Thread corrosion; 3. Improper torque leading to damage.

1. Torque to manufacturer’s standards; 2. Replace after one fatigue cycle; 3. Use lock washers to prevent loosening.

4

Washer

GB93-87 (20)

Carbon steel (spring steel)

1. Elastic fatigue losing locking function; 2. Corrosion causing breakage; 3. Deformation from over-tightening.

1. Replace with bolts; 2. Do not reuse deformed washers; 3. Ensure compatibility with bolt size.

5

Pin retainer

107.W.20.17-2

Carbon steel (Q235B)

1. Wear from contact with crosshead pin; 2. Corrosion from lubricant; 3. Deformation from improper installation.

1. Ensure proper fit with crosshead pin; 2. Apply anti-corrosion coating; 3. Inspect for wear during maintenance.

6

Outer retainer

107.04.20.24 (170)

Carbon steel (Q235B)

1. Wear from bearing rotation; 2. Corrosion from on-site environment; 3. Impact damage during disassembly.

1. Install tightly to fix the bearing; 2. Apply anti-rust paint; 3. Disassemble gently to avoid damage.

7

Inside retainer

107.04.20.18 (260)

Carbon steel (Q235B)

1. Wear from bearing movement; 2. Contamination causing abrasive wear; 3. Deformation from uneven pressure.

1. Clean before installation; 2. Ensure uniform pressure during assembly; 3. Replace if deformed.

8

Bush

107.14.10.01

Copper alloy (ZCuSn10Pb1)

1. Wear from shaft rotation; 2. Lack of lubrication causing metal-to-metal friction; 3. Abrasive wear from debris.

1. Ensure sufficient lubrication; 2. Clean assembly area to avoid debris; 3. Replace if wear exceeds 0.5mm.

9

key

107.14.10.08 (45x240)

45# steel

1. Shear stress from torque transmission; 2. Wear from keyway contact; 3. Impact damage during assembly.

1. Ensure proper fit with keyway; 2. Avoid excessive torque during installation; 3. Inspect for shear cracks regularly.

10

Key

107.04.10.10 (44.45x360)

45# steel

1. Wear from reciprocating torque; 2. Keyway deformation causing uneven stress; 3. Corrosion from lubricant contamination.

1. Check keyway for deformation before installation; 2. Use clean lubricant; 3. Replace if excessive wear occurs.

11

Wire

Ø1.6 L=15000

Stainless steel (304)

1. Fatigue breakage from repeated bending; 2. Corrosion from humid environment; 3. Wear from friction with other components.

1. Avoid excessive bending during installation; 2. Store in a dry place; 3. Replace if signs of fatigue appear.

12

Wire

Ø1.2 L=600

Stainless steel (304)

1. Wear from friction; 2. Breakage from overloading; 3. Corrosion from on-site chemicals.

1. Do not exceed load capacity; 2. Keep away from chemicals; 3. Inspect for wear before use.

13

Shim for pin retainer

107.14.20.21

Carbon steel (Q235B)

1. Wear from contact with pin retainer; 2. Deformation from pressure; 3. Corrosion from lubricant.

1. Select proper thickness for fit; 2. Ensure even pressure during installation; 3. Replace if deformed or worn.

14

Shim for pin retainer

107.14.20.22

Carbon steel (Q235B)

1. Abrasive wear from debris; 2. Fatigue deformation from long-term pressure; 3. Corrosion from humid environment.

1. Clean before installation; 2. Replace if thickness deviates from standard; 3. Store in a clean, dry place.

15

Shim for pin retainer

107.14.20.23

Carbon steel (Q235B)

1. Wear from pin retainer movement; 2. Pressure causing material thinning; 3. Corrosion from lubricant additives.

1. Check thickness regularly; 2. Replace with matching specification; 3. Avoid over-tightening to prevent damage.

16

Shim for pin retainer

107.14.20.24

Carbon steel (Q235B)

1. Deformation from uneven pressure; 2. Wear from long-term use; 3. Corrosion from on-site environment.

1. Install evenly to ensure uniform pressure; 2. Apply anti-corrosion coating; 3. Replace if deformation occurs.

1

How to select the correct lubricant for pinion shaft and crosshead assemblies?

Use ISO VG 68 extreme pressure industrial gear oil, compliant with GB/T 3141-2019. It resists high temperature and load, reducing friction between shafts, bearings, and bushes, extending component service life.

2

What is the replacement cycle for the oil seal (D7-1-67 220x260x18) and gaskets?

Replace the oil seal every 600 working hours; replace gaskets after each disassembly or every 800 working hours. Frequent replacement prevents lubricant leakage and impurity intrusion, protecting core components.

3

How to prevent crosshead pin and key shear failure?

Ensure proper fit between crosshead pin and retainer, and key and keyway; avoid sudden overload during startup; torque fasteners to standard values; conduct monthly inspections for wear or stress cracks.