GH3101-02.00 Crankshaft Assembly for HHF-1000 Mud Pump

1

GH3101-02.06

Connecting rod

Alloy steel (40CrNiMoA), forged and heat-treated for tensile strength (≥980MPa) per GB/T 3077-2015

1. Fatigue from repeated high-load motion; 2. Misalignment causing uneven stress distribution; 3. Lubrication deficiency leading to metal-to-metal contact.

1. Inspect for cracks via magnetic particle testing (MPT) quarterly per API 7K; 2. Ensure lubricant viscosity meets ISO VG 460 standards; 3. Verify rod alignment during assembly to avoid eccentricity.

2

GH3101-02.08.00

Crankshaft

High-strength alloy steel (42CrMo), precision ground with nitride hardening (surface hardness ≥60 HRC)

1. Bearing journal wear from contaminated lubricant; 2. Torsional fatigue from power fluctuations; 3. Corrosion from moisture in the lubrication system.

1. Replace lubricant filters monthly to prevent debris buildup; 2. Monitor crankshaft runout (≤0.02mm) during routine checks; 3. Keep breather caps clean to avoid moisture ingress.

3

GH3101-02.10B

Bull gear（widened）

Alloy steel (20CrMnTi), carburized and quenched (tooth surface hardness 58-62 HRC) with precision gear cutting

1. Tooth wear from misalignment or inadequate lubrication; 2. Impact damage from sudden load spikes; 3. Gear tooth pitting due to contaminated oil.

1. Use anti-wear gear oil (API GL-4) for lubrication; 2. Check gear backlash (0.15-0.30mm) quarterly; 3. Avoid sudden pump startups to reduce impact on gear teeth.

1

GH3101-02.01.00

Cover, main bearing

Carbon steel (SAE 1045), zinc-plated for anti-corrosion with precision-machined mating surfaces

1. Deformation from over-tightening during installation; 2. Wear from bearing vibration; 3. Corrosion from drilling fluid leakage.

1. Torque fasteners to 120 ft-lbs per UN thread standards; 2. Inspect mating surfaces for scratches before installation; 3. Replace seal gaskets annually to prevent fluid ingress.

2

GH3101-02.02

Sleeve, main bearing (right)

Bearing steel (GCr15), precision ground with a phosphorus coating for enhanced lubricity

1. Wear from journal misalignment; 2. Thermal fatigue from high operating temperatures; 3. Contamination-induced abrasion.

1. Ensure sleeve-to-journal fit clearance (0.03-0.05mm); 2. Monitor oil temperature (≤80°C) during operation; 3. Flush lubrication lines before sleeve installation.

3

GH3101-02.04

Insider retainer

Stainless steel (AISI 304), stamped and deburred for precise dimensional tolerance

1. Fatigue from repeated vibration; 2. Corrosion from moisture or drilling fluid residue; 3. Deformation from improper installation.

1. Inspect for warpage during maintenance; 2. Clean retainer grooves thoroughly to remove debris; 3. Ensure secure fit to prevent axial movement.

4

GH3101-02.05.00

Outside retainer

Stainless steel (AISI 304), with a passivated surface to resist corrosion

1. Wear from contact with rotating components; 2. Loosening due to pump vibration; 3. Corrosion from external environmental factors.

1. Tighten retaining fasteners per torque specs during assembly; 2. Inspect for wear marks quarterly; 3. Apply anti-corrosion spray for outdoor/harsh environments.

5

GH3101-02.07

Locating ring（Ⅰ）

Carbon steel (SAE 1018), case-hardened for wear resistance

1. Wear from axial movement of components; 2. Misalignment causing uneven pressure; 3. Fatigue from repeated load cycles.

1. Verify ring thickness tolerance (±0.01mm) before installation; 2. Ensure proper seating in the mounting groove; 3. Replace if wear exceeds 0.05mm.

6

GH3101-02.09

Locating ring（Ⅱ）

Carbon steel (SAE 1018), case-hardened for wear resistance

1. Same as Locating Ring (Ⅰ), with additional stress from crankshaft end play; 2. Corrosion from lubricant contamination; 3. Impact damage during disassembly.

1. Check crankshaft end play (0.10-0.20mm) to avoid excess stress; 2. Clean the mounting area before installation; 3. Use plastic tools during disassembly to prevent impact damage.

7

GH3101-02.13

retainer ring

Spring steel (65Mn), heat-treated for elasticity and wear resistance

1. Elastic fatigue from repeated expansion/contraction; 2. Damage from improper installation (overstretching); 3. Corrosion from moisture.

1. Use specialized pliers to avoid overstretching during installation; 2. Inspect for cracks or loss of elasticity quarterly; 3. Replace rings in pairs for uniform retention.

8

GH3101-02.14

Sleeve, main bearing (left)

Bearing steel (GCr15), precision ground with a phosphorus coating for enhanced lubricity

1. Same as right main bearing sleeve, with added stress from bull gear rotation; 2. Lubrication starvation; 3. Journal misalignment.

1. Ensure symmetric fit with right sleeve; 2. Confirm lubricant flow to the left bearing before startup; 3. Check for thermal discoloration (sign of overheating) monthly.

9

GH3101-02.21

Eccentric wheel Bearing：929/558.8QU

Chrome steel (GCr15SiMn), sealed with nitrile rubber (NBR) for contamination resistance

1. Bearing cage damage from shock loads; 2. Lubricant degradation at high temperatures; 3. Contamination from dust or drilling fluid.

1. Avoid shock loads during pump startup/shutdown; 2. Replace sealed bearings annually (or if seal damage is detected); 3. Keep bearing housing clean to prevent debris ingress.

10

GH3101-02.22

Main bearing：3G4053156H

Roller bearing steel (GCr15), with a spherical outer ring for misalignment compensation

1. Roller wear from contaminated lubricant; 2. Overheating due to poor ventilation; 3. Axial overload from component misalignment.

1. Use clean, filtered lubricant (ISO VG 320); 2. Ensure bearing housing ventilation is unobstructed; 3. Check axial load during alignment to stay within bearing specs.

1

GH3101-02.03

Seal gasket

Nitrile rubber (NBR) with a steel core, resistant to oil and drilling fluid (temperature range -20°C to 120°C)

1. Degradation from high temperature or chemical exposure; 2. Damage from improper installation (pinching); 3. Hardening from prolonged service.

1. Replace annually or if leakage is detected; 2. Clean mating surfaces before installation; 3. Avoid over-tightening fasteners to prevent gasket pinching.

2

GH3101-02.11

Bolt：1 1/4-8UN-2A×108

Alloy steel (10.9 grade), heat-treated with zinc plating for anti-corrosion (ANSI B1.1 thread standard)

1. Thread wear from repeated installation/removal; 2. Fatigue failure from vibration; 3. Corrosion from environmental exposure.

1. Use thread locker (Loctite 242) to prevent loosening; 2. Torque to 350 ft-lbs per API 7K specs; 3. Inspect threads for damage before reinstallation.

3

GH3101-02.12.00

Nut：1 1/4-8UN-2B

Alloy steel (10 grade), heat-treated with a nylon insert for self-locking (ANSI B1.1 thread standard)

1. Nylon insert degradation from high temperatures; 2. Thread wear from over-tightening; 3. Corrosion leading to seizing.

1. Replace if nylon insert loses elasticity; 2. Torque with compatible bolts (10.9 grade); 3. Apply anti-seize compound to threads for harsh environments.

4

GH3101-02.15

Plug

Carbon steel (SAE 1035), zinc-plated with a PTFE seal for leak resistance

1. Seal degradation from fluid exposure; 2. Thread damage from improper removal; 3. Corrosion from moisture.

1. Use a socket wrench to avoid thread stripping; 2. Replace PTFE seal when reinstalling; 3. Inspect for leaks after pump startup.

5

GH3101-02.16

Bolt：5/8-11UNC-2A×45

Alloy steel (8.8 grade), zinc-plated with coarse threads (ANSI B1.1 UNC standard)

1. Loosening from pump vibration; 2. Thread damage from cross-threading; 3. Fatigue from repeated load cycles.

1. Torque to 75 ft-lbs; 2. Align threads properly before tightening to avoid cross-threading; 3. Inspect for stretch or deformation quarterly.

6

GH3101-02.17

Baffle

Carbon steel (SAE 1010), stamped and painted for anti-corrosion

1. Corrosion from drilling fluid or moisture; 2. Damage from debris impact; 3. Deformation from improper handling.

1. Inspect for rust during routine maintenance; 2. Clean baffle surfaces to remove debris buildup; 3. Store in a dry area when not in use.

7

GH3101-02.18

Bolt, main bearing：2 1/2-8UN-3A

Alloy steel (12.9 grade), heat-treated with black oxide coating (high-strength for heavy loads)

1. Fatigue failure from high torque and vibration; 2. Thread wear from over-tightening; 3. Corrosion from lubricant contamination.

1. Torque to 850 ft-lbs per manufacturer specs; 2. Use calibrated torque wrenches for accuracy; 3. Replace after 2 service cycles to prevent fatigue.

8

GH3101-02.19.00

Shim set

Stainless steel (AISI 304), precision-cut with thickness tolerance ±0.005mm

1. Metal fatigue from uneven load; 2. Corrosion from moisture; 3. Misalignment causing localized stress.

1. Replace as a full set to maintain uniform thickness; 2. Clean mating surfaces before installation; 3. Avoid bending or twisting shims during handling.

9

GH3101-02.20

Screw ：5/8-11UNC-2A×100

Alloy steel (8.8 grade), zinc-plated with coarse threads (ANSI B1.1 UNC standard)

1. Loosening from vibration; 2. Thread damage from improper installation; 3. Corrosion from external exposure.

1. Apply thread locker to prevent vibration-induced loosening; 2. Use a torque wrench to avoid over-tightening; 3. Inspect threads for wear before reuse.

10

GB/T343-1994

Locking wire：SZ-1.50

Stainless steel (AISI 304), high-tensile for secure fastener locking

1. Fatigue from repeated vibration; 2. Breakage from improper twisting; 3. Corrosion from moisture or chemicals.

1. Twist wires to 1.5-2 turns per inch (avoid over-twisting); 2. Replace after each disassembly; 3. Ensure wire is routed to prevent contact with rotating parts.

11

GB/T343-1994

Locking wire：SZ-3.00

Stainless steel (AISI 304), heavier gauge for high-load fasteners

1. Same as SZ-1.50, with added stress from larger fasteners; 2. Kinking during installation; 3. Corrosion in harsh drilling environments.

1. Use for main bearing bolts and high-torque fasteners; 2. Avoid kinking to maintain tensile strength; 3. Inspect for fraying quarterly.

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242

Threaded Sealant

Anaerobic sealant (medium-strength), resistant to oil, fuel, and drilling fluids (operating temp -55°C to 150°C)

1. Degradation from high temperatures; 2. Contamination before curing; 3. Inadequate application (too thin/too thick).

1. Apply a thin, uniform layer to male threads; 2. Allow 24 hours for full curing before operation; 3. Clean threads thoroughly before application.

13

GB/T848-1985

Washer ：16

Carbon steel (SAE 1010), zinc-plated with a flat design (DIN 125 standard)

1. Deformation from over-tightening; 2. Corrosion from moisture; 3. Wear from repeated fastener removal.

1. Match washer size to bolt diameter; 2. Replace washers when they show signs of deformation; 3. Use under nuts to distribute clamping force.

What thread standards apply to the bolts and nuts in this assembly?

Bolts/nuts follow ANSI B1.1 standards: UN (1 1/4-8UN) and UNC (5/8-11UNC) threads. Use thread tools matching these standards to avoid damage, and adhere to API 7K torque specs for installation.

How often should the crankshaft and connecting rod be inspected for fatigue?

Conduct quarterly magnetic particle testing (MPT) per API 7K for crankshafts and connecting rods. Replace components if cracks or fatigue signs are found—this prevents catastrophic failure during high-load operation.

Can I mix different brands of threaded sealant or lubricant for these components?

No. Use only medium-strength anaerobic sealant (matching grade 242) and lubricants meeting ISO VG 320/460 specs. Mixing brands may cause chemical incompatibility, leading to seal failure or lubricant degradation.