Connecting Rod Component NB004.02.01.00 & Matching Parts

1

NB004.02.01.00

Connecting rod component

Alloy steel 45# (precision forged, heat-treated for fatigue resistance, surface anti-corrosion plated)

1. Fatigue fracture at the rod neck from repeated reciprocation; 2. Wear at connection points from misalignment; 3. Corrosion from lubricant contamination.

1. Inspect for micro-cracks via magnetic particle testing annually; 2. Ensure coaxiality with crankshaft during assembly; 3. Replace lubricant per 200 operating hours.

2

NB001.02.03.05

Connecting rod body

Alloy steel 40Cr (quenched and tempered, precision machined to ensure dimensional accuracy)

1. Stress deformation from uneven load; 2. Wear at copper sleeve mounting hole; 3. Fatigue cracking from long-term high-load operation.

1. Check mounting hole roundness quarterly; 2. Avoid overloading the pump beyond rated parameters; 3. Grind and rework worn holes if needed.

1

HBZ013.02.03.06

Connecting rod copper sleeve

ZCuSn10Pb1 (tin bronze, high wear resistance, good lubricity)

1. Wear from insufficient lubrication; 2. Scuffing from foreign debris; 3. Deformation from improper press-fitting.

1. Apply lubricating grease before press-fitting; 2. Clean mounting hole to remove debris; 3. Replace if inner diameter wear exceeds 0.15mm.

2

NB004.02.01.01

Connecting rod bearing shell

Babbitt alloy (tin-lead base, bonded to steel backing, high fatigue resistance)

1. Alloy layer wear from crankshaft journal friction; 2. Spalling from insufficient lubrication; 3. Damage from journal misalignment.

1. Ensure crankshaft journal surface roughness meets specs; 2. Maintain continuous lubricant flow; 3. Replace in pairs to ensure uniform load distribution.

1

NB001.02.03.02

Connecting rod bolt

Alloy steel 12.9 grade (heat-treated, high tensile strength, surface black oxide treated)

1. Fatigue fracture from repeated reciprocating vibration; 2. Thread wear from over-tightening; 3. Corrosion leading to reduced strength.

1. Torque to 85-90N·m per standard specs; 2. Replace after one disassembly (avoid reuse); 3. Apply thread lock adhesive to prevent loosening.

2

GB/T70.1

Socket cap screw M12×60

Alloy steel 10.9 grade (surface zinc-plated, compliant with GB/T70.1)

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

1. Torque to 45-50N·m; 2. Use a torque wrench for precise tightening; 3. Inspect monthly for loosening.

3

GB/T93

Spring washer 12

Spring steel 65Mn (heat-treated for elasticity, surface zinc-plated, compliant with GB/T93)

1. Elastic fatigue from vibration; 2. Deformation from over-tightening; 3. Corrosion leading to loss of anti-loosening function.

1. Replace with new washers during each disassembly; 2. Match exclusively with M12 fasteners; 3. Discard if deformed or rusted.

4

NB001.02.03.04

Positioning pin, connecting rod body

Carbon steel 45# (heat-treated, surface anti-rust plated)

1. Wear from repeated assembly/disassembly; 2. Shear failure from misalignment; 3. Corrosion leading to loose fitting.

1. Align parts before inserting the pin; 2. Use a press tool for installation (avoid hammering); 3. Inspect for wear or corrosion quarterly.

5

NB001.02.03.01

Positioning pin, connecting rod bearing shell

Carbon steel 45# (heat-treated, surface anti-rust plated)

1. Wear from bearing shell movement; 2. Shear failure from uneven load; 3. Corrosion leading to misalignment.

1. Ensure proper fit with bearing shell notch; 2. Replace if diameter wear exceeds 0.1mm; 3. Clean mounting hole before installation.

6

HBZ013.02.03.08

Positioning screw, connecting rod copper sleeve

Carbon steel 8.8 grade (surface zinc-plated, precision machined)

1. Thread wear from repeated adjustment; 2. Loosening from vibration; 3. Corrosion leading to seized threads.

1. Tighten to specified torque after copper sleeve installation; 2. Apply thread lock adhesive; 3. Inspect quarterly for loosening.

1

GB/T4240-1993

Stainless steel wire φ1.6

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

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

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

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What equipment are these connecting rod parts compatible with?

These parts are exclusively compatible with NB004/NB001 series industrial pumps (e.g., quintuple pumps), especially matching the Connecting Rod Component NB004.02.01.00. Non-matching use will cause misalignment and transmission failure.

2

Why can’t connecting rod bolts be reused after disassembly?

Connecting rod bolts bear high fatigue load during operation. Disassembly and reassembly will further weaken their tensile strength, increasing the risk of sudden fracture. Following industrial safety standards, they must be replaced with new ones after each disassembly.

3

How often should key connecting rod components be inspected and replaced?

Inspect connecting rod body and bearing components monthly; replace bearing shells every 1 year. Connecting rod bolts and spring washers must be replaced after each disassembly. Copper sleeves should be replaced if inner diameter wear exceeds 0.15mm.