Crankshaft & Gear Assembly Parts for Industrial Pumps

1

NB004.02.00

Crankshaft assembly

Alloy steel 35CrMoV (precision forged, heat-treated for fatigue resistance, surface nitriding)

1. Journal wear from bearing friction; 2. Stress cracking from uneven load distribution; 3. Corrosion from lubricant contamination.

1. Replace lubricating oil/filter per 200 operating hours; 2. Conduct annual dynamic balance testing; 3. Grind journals if wear exceeds 0.2mm.

2

NB001.02.05

Crankshaft

Alloy steel 40CrNiMoA (quenched and tempered, journal chrome-plated for wear resistance)

1. Wear from long-term bearing contact; 2. Fatigue deformation from high torque; 3. Micro-cracks from improper installation alignment.

1. Ensure coaxiality with gear assembly during installation; 2. Inspect for micro-cracks via magnetic particle testing annually; 3. Maintain adequate lubrication.

3

NB004.02.01.00

Connecting rod component

Alloy steel 45# (precision machined, surface anti-corrosion treated)

1. Bearing hole wear from reciprocating motion; 2. Fatigue fracture at the rod neck; 3. Loosening of connecting parts due to vibration.

1. Inspect bearing hole roundness quarterly; 2. Tighten connecting fasteners to specified torque; 3. Replace if neck wear or cracks are detected.

4

NB001.02.01.00

Right-hand bull gear assembly

Alloy steel 20CrMnTi (carburized and quenched, gear tooth precision ground)

1. Gear tooth wear/pitting from meshing friction; 2. Tooth root fatigue cracking from high torque; 3. Misalignment leading to uneven load.

1. Align with left-hand gear to ensure meshing clearance (0.15-0.3mm); 2. Inspect teeth for pitting monthly; 3. Lubricate with extreme-pressure gear oil.

5

NB001.02.04.00

Left-hand bull gear assembly

Alloy steel 20CrMnTi (carburized and quenched, gear tooth precision ground)

1. Gear tooth wear/pitting from meshing friction; 2. Tooth root fatigue cracking from high torque; 3. Misalignment leading to uneven load.

1. Align with right-hand gear to ensure meshing clearance (0.15-0.3mm); 2. Inspect teeth for pitting monthly; 3. Lubricate with extreme-pressure gear oil.

1

NB001.02.09.00

Cylindrical roller bearing

GCr15 bearing steel (heat-treated, precision graded, sealed with low-temperature resistant grease)

1. Wear from insufficient lubrication; 2. Cage damage from foreign debris; 3. Fatigue failure from overloading.

1. Fill with specified lubricating grease before installation; 2. Clean installation area to avoid debris; 3. Replace if abnormal noise or temperature rise occurs.

2

NB001.02.10.00

Cylindrical roller bearing

GCr15 bearing steel (heat-treated, precision graded, sealed with low-temperature resistant grease)

1. Wear from insufficient lubrication; 2. Cage damage from foreign debris; 3. Fatigue failure from overloading.

1. Fill with specified lubricating grease before installation; 2. Clean installation area to avoid debris; 3. Replace if abnormal noise or temperature rise occurs.

3

NB001.02.02

Circlip for shaft

Spring steel 65Mn (heat-treated for elasticity, surface anti-rust plated)

1. Elastic fatigue from repeated disassembly; 2. Deformation from improper installation; 3. Corrosion leading to reduced clamping force.

1. Use specialized circlip pliers for installation/removal; 2. Inspect elasticity quarterly; 3. Replace if deformation or corrosion is found.

4

JB/T7934-1999

Expansion sleeve Z5-215.9×281

Carbon steel Q235B (surface galvanized, compliant with JB/T7934-1999)

1. Wear from torque-induced friction; 2. Loosening from vibration; 3. Corrosion leading to reduced expansion force.

1. Torque bolts evenly per standard specs; 2. Retighten after initial 10 operating hours; 3. Inspect for corrosion and loosening monthly.

1

GB/T32

Bolt M10×40

Carbon steel 8.8 grade (surface zinc-plated, compliant with GB/T32)

1. Thread stripping from over-tightening; 2. Fatigue fracture from vibration; 3. Corrosion leading to seized threads.

1. Torque to 25-30N·m; 2. Apply anti-rust thread lubricant; 3. Use matching wrenches to avoid cross-threading.

2

GB/T5782

Bolt M20×40

Alloy steel 10.9 grade (surface zinc-plated, compliant with GB/T5782)

1. Fatigue fracture from high torque; 2. Thread wear from repeated assembly; 3. Corrosion leading to reduced strength.

1. Torque to 120-130N·m; 2. Tighten in diagonal order for uniform force; 3. Replace every 18 months in harsh environments.

3

GB/T5782

Bolt M20×170

Alloy steel 10.9 grade (surface zinc-plated, compliant with GB/T5782)

1. Fatigue fracture from high torque; 2. Thread wear from repeated assembly; 3. Corrosion leading to reduced strength.

1. Torque to 125-135N·m; 2. Tighten in diagonal order for uniform force; 3. Replace every 18 months in harsh environments.

4

GB/T5783

Bolt M12×30

Carbon steel 8.8 grade (surface zinc-plated, compliant with GB/T5783)

1. Thread stripping from over-tightening; 2. Fatigue from vibration; 3. Corrosion leading to failure.

1. Torque to 40-45N·m; 2. Use lock washers for anti-loosening; 3. Inspect monthly for loosening.

5

GB/T77

Hexagon socket set screw M12×25

Alloy steel 12.9 grade (surface black oxide treated, compliant with GB/T77)

1. Thread wear from repeated tightening; 2. Shear failure from over-force; 3. Corrosion leading to seized threads.

1. Torque to 35-40N·m; 2. Apply thread lock adhesive; 3. Replace if thread damage is detected.

6

DTF6177.1

Hexagon flange check nut Spiralock M12

Carbon steel 10B21 (heat-treated, surface zinc-plated, compliant with DTF6177.1)

1. Thread wear from repeated use; 2. Loosening from extreme vibration; 3. Corrosion reducing clamping force.

1. Pair exclusively with M12 bolts; 2. Torque to match corresponding bolts; 3. Inspect and retighten monthly.

7

NB001.02.08

Washer

Carbon steel 10# (surface zinc-plated, heat-treated for flatness)

1. Deformation under high torque; 2. Corrosion leading to reduced load-bearing; 3. Wear from friction with bolts/nuts.

1. Match with corresponding bolt size; 2. Replace if deformed or rusted; 3. Avoid reuse after heavy load.

8

GB/T97

Washer 20

Carbon steel 10# (surface zinc-plated, compliant with GB/T97)

1. Deformation under high torque; 2. Corrosion leading to reduced load-bearing; 3. Wear from friction with bolts/nuts.

1. Pair with M20 bolts; 2. Replace if deformed or rusted; 3. Avoid reuse after heavy load.

1

GB/T3452.1

O-ring 30×3.55

Nitrile rubber (NBR 70, oil-resistant, compliant with GB/T3452.1)

1. Aging from high temperature and oil contact; 2. Damage from sharp installation edges; 3. Compression set from long-term use.

1. Smooth installation surfaces; 2. Inspect for hardening/cracks monthly; 3. Replace every 8-12 months.

2

GB/T4240-1993

Stainless steel wire φ1.6×1000

Stainless steel 304 (corrosion-resistant, compliant with GB/T4240-1993)

1. Fatigue breaking from repeated bending; 2. Corrosion in harsh chemical environments; 3. Wear from friction with sharp edges.

1. Avoid excessive bending during use; 2. Cut to required length with specialized tools; 3. Store in dry, clean environment.

3

NB001.02.06

Clamp plate

Carbon steel Q235B (surface anti-rust painted, precision machined)

1. Wear from vibration-induced friction; 2. Deformation from uneven clamping force; 3. Corrosion leading to structural weakening.

1. Tighten fasteners evenly; 2. Inspect for deformation quarterly; 3. Touch up paint if peeling to prevent corrosion.

4

NB004.02.02

Rotary crossover sub

Stainless steel 316 (anti-corrosion, high-pressure resistant, precision machined)

1. Thread wear from repeated connection; 2. Corrosion from fluid contaminants; 3. Leakage from seal failure.

1. Apply high-pressure thread sealant; 2. Inspect thread integrity before use; 3. Clean internal channels regularly.

1

What is the compatibility of these parts with other pump models?

These parts are tailored for pumps matching NB004/NB001 series assemblies. Dimensions, torque specs, and gear meshing parameters are model-exclusive; misuse will cause transmission failure, leakage, or structural damage.

2

How often should key transmission components be inspected and replaced?

Inspect crankshaft/gear assemblies monthly for wear; replace every 2 years. Cylindrical roller bearings should be replaced every 1 year or if abnormal temperature/noise occurs. Sealing parts (O-rings) need replacement every 8-12 months.

3

Why is compliance with standards like GB/T and JB/T important for these parts?

Standards like GB/T (fasteners) and JB/T7934-1999 (expansion sleeves) ensure precise fit, torque-bearing capacity, and interchangeability. Non-compliant parts lead to loose connections, uneven load distribution, and premature failure.