JQH Pneumatic Winch Parts List-1

1

Crankshaft

JQH-5×48-0013

42CrMo Alloy Steel (Quenched & Tempered)

1. Cyclic alternating load leading to fatigue cracking; 2. Insufficient lubrication causing journal wear and scoring.

1. Regularly check lubricating oil quality and replace it according to the maintenance cycle; 2. Monitor vibration and temperature during operation to detect early fatigue signs.

2

Connecting Rod

JQH-5×48-0203

40Cr Alloy Steel (Forged & Heat-Treated)

1. High-pressure impact during piston movement causing rod body deformation; 2. Wear at the small end bushing due to misalignment with the piston pin.

1. Ensure proper assembly alignment between connecting rod, piston, and crankshaft; 2. Inspect the small end bushing clearance regularly and replace if excessive.

3

Piston

JQH-5×48-0201

Aluminum Alloy 6061-T6 (Anodized Surface)

1. Abrasion from contaminated compressed air (containing dust, moisture) leading to surface scratches; 2. Excessive cylinder pressure causing piston top deformation.

1. Install a high-efficiency air filter and dryer in the pneumatic system; 2. Monitor and control the input air pressure within the rated range (avoid overpressure operation).

4

Piston Ring

SD165-04002

Nodular Cast Iron with Graphite Coating

1. Thermal fatigue caused by frequent start-stop and temperature fluctuations; 2. Wear due to insufficient lubrication or abrasive particles in the cylinder.

1. Ensure continuous and sufficient oil supply to the cylinder; 2. Avoid frequent short-cycle start-stop operations; replace piston rings if air leakage is detected.

5

Piston Pin

JQH-5×48-0202

20CrMnTi Alloy Steel (Carburized & Quenched)

1. Sliding friction with the needle roller bearing causing surface wear; 2. Stress concentration at both ends leading to microcracks.

1. Check the needle roller bearing condition regularly (replace if seized or worn); 2. Ensure proper fit clearance between piston pin and piston pin hole.

1

Cylinder Sleeve

JQH-5×48-0001

Alloy Cast Iron with Nitrided Surface (Hardness ≥ HV850)

1. Abrasion from piston ring movement (exacerbated by contaminated lubricating oil); 2. Corrosion caused by moisture in compressed air.

1. Use high-quality anti-corrosion lubricating oil; 2. Regularly drain moisture from the pneumatic system's air tank; inspect cylinder inner wall for scratches periodically.

2

Body

JQH-5×48-0017

Gray Cast Iron HT250 (Resin Sand Casting)

1. Stress cracking due to uneven temperature distribution during operation; 2. Bolt loosening leading to structural vibration and fatigue damage.

1. Avoid sudden temperature changes (e.g., cold start in low-temperature environments without preheating); 2. Regularly check and torque all fixing bolts.

3

Exhaust Cover

JQH-5×48-0048

Aluminum Alloy 5052 (Stamped & Machined)

1. Impact damage from external debris during operation; 2. Seal failure due to aging of the gasket between the cover and the body.

1. Install a protective shield around the exhaust cover in dusty or debris-prone environments; 2. Replace the exhaust cover gasket during regular maintenance.

4

Gasket 1

JQH-5×48-0022

Nitrile Rubber (NBR) with Reinforced Fiber

1. Aging and hardening due to long-term exposure to high temperature and lubricating oil; 2. Damage caused by improper assembly (over-tightening of bolts).

1. Replace gaskets during each major maintenance cycle (or if oil/air leakage is detected); 2. Torque assembly bolts according to the specified torque value to avoid over-compression.

1

Main Valve

JQH-5×48-0019

Stainless Steel 304 (Precision Machined)

1. Wear of valve core and seat due to abrasive particles in compressed air; 2. Sealing ring damage caused by pressure fluctuations.

1. Ensure the pneumatic system's filter is functioning properly (replace filter elements regularly); 2. Stabilize the input air pressure to avoid sudden surges.

2

Main Valve Bush

JQH-5×48-0020

Copper Alloy ZCuSn10Pb1 (Babbitt Alloy Lining)

1. Sliding friction between valve core and bush leading to wear; 2. Lack of lubrication causing dry friction and seizure.

1. Ensure continuous lubrication of the valve system (check oil metering pin functionality); 2. Avoid frequent rapid switching of the main valve to reduce friction.

3

Venting Screw Plug

JQH-5×48-0015

Carbon Steel Q235 with Zinc Plating

1. Thread wear due to frequent disassembly for venting; 2. Corrosion of the sealing surface leading to air leakage.

1. Use a torque wrench when disassembling/assembling to avoid thread damage; 2. Apply anti-corrosion sealant to the thread during assembly.

4

Oil Metering Pin

JQH-5×48-0300

Brass H62 (Precision Ground)

1. Clogging due to impurities in the lubricating oil; 2. Wear of the metering hole leading to inaccurate oil supply.

1. Use filtered lubricating oil of the specified grade; 2. Clean the oil metering pin and metering hole regularly to remove deposits.

1

Rivet 5×46

GB869-86

Aluminum Alloy 5056

1. Fatigue failure due to cyclic vibration; 2. Shear damage caused by misalignment of the connected parts.

1. Inspect rivets regularly for signs of looseness or deformation; 2. Ensure proper alignment of parts before riveting.

2

Rivet 8×90

GB869-86

Carbon Steel Q235 with Zinc Plating

1. Corrosion in humid environments leading to reduced shear strength; 2. Overloading of the connected structure causing rivet shear.

1. Apply anti-corrosion coating to rivets in humid/offshore environments; 2. Avoid operating the winch beyond its rated load to reduce stress on rivets.

3

Screw M10×25

GB70-85

Alloy Steel 4.8 Grade (Zinc Plated)

1. Loosening due to vibration leading to thread wear; 2. Stress corrosion cracking in corrosive environments.

1. Use lock washers or thread-locking adhesive during assembly; 2. Regularly re-torque screws and replace if thread damage is detected.

4

Washer 10

GB93-87

Spring Steel 65Mn (Heat-Treated)

1. Fatigue deformation due to repeated compression; 2. Corrosion leading to reduced elasticity and loss of locking function.

1. Replace washers when they lose elasticity (no rebound after compression); 2. Avoid using washers in direct contact with corrosive substances.

5

Elastic Retainer Ring for Holes 12

GB893.1-86 / GB70-85

Spring Steel 60Si2Mn

1. Elastic fatigue due to repeated assembly/disassembly; 2. Wear of the ring edge caused by contact with rotating parts.

1. Avoid repeated disassembly of the retainer ring (replace if removed multiple times); 2. Ensure the installation groove is clean and free of burrs to prevent abnormal wear.

6

Cotter Pin 2.5×36

GB91-86

Carbon Steel Q215 (Zinc Plated)

1. Bending fatigue due to vibration; 2. Corrosion leading to brittleness and breakage.

1. Check cotter pins regularly for bending or corrosion; replace if damaged; 2. Ensure the cotter pin is fully expanded after assembly to prevent disengagement.

7

Pin B3×16

GB119-86

Carbon Steel 45# (Quenched & Tempered)

1. Shear wear due to relative movement between connected parts; 2. Corrosion leading to reduced shear strength.

1. Lubricate the pin surface regularly to reduce friction; 2. Replace pins if excessive wear or corrosion is detected.

8

Key 6×16

GB1096-79

Alloy Steel 40Cr

1. Shear failure due to overload torque; 2. Wear of the key and keyway due to insufficient fit.

1. Ensure the key and keyway have the correct fit (no excessive clearance); 2. Avoid operating the winch beyond its rated torque to prevent key shear.

1

Roller 6×6

GB46561-82

GCr15 Bearing Steel (Quenched)

1. Rolling fatigue due to continuous load; 2. Abrasion caused by dust and debris entering the bearing area.

1. Keep the roller installation area clean; 2. Lubricate the roller regularly with high-temperature bearing grease.

2

Needle Roller Bearing

GB5846-86

GCr15 Bearing Steel + Steel Cage

1. Lack of lubrication leading to dry friction and seizure; 2. Damage to the needle rollers due to impact loads.

1. Ensure sufficient lubrication before operation; 2. Avoid sudden impact loads on the bearing during winch start-up.

3

Pad 1

JQH-5×48-0002

Rubber EPDM (Heat-Resistant)

1. Aging and hardening due to long-term exposure to high temperature and lubricating oil; 2. Compression set caused by continuous pressure.

1. Replace pads during regular maintenance; 2. Avoid over-tightening the fixing bolts to prevent excessive compression.

4

Pad 3

JQH-5×48-0018

Asbestos-Free Friction Material

1. Wear due to friction with moving parts; 2. Degradation due to oil contamination.

1. Inspect pad thickness regularly (replace if below the minimum wear limit); 2. Avoid oil leakage onto the pad surface.

5

Balance Weight

JQH-5×48-0034

Gray Cast Iron HT200

1. Corrosion in humid environments leading to weight loss; 2. Impact damage from external collisions.

1. Apply anti-corrosion paint to the balance weight surface; 2. Install a protective guard around the balance weight in high-risk areas.

6

Sealing Washer for Screw Plugs 16×20

JB/ZQ4454-86

Fluorine Rubber (FKM) (Oil & High-Temperature Resistant)

1. Aging and cracking due to high temperature and chemical corrosion from lubricating oil; 2. Damage caused by improper assembly.

1. Replace sealing washers during each screw plug disassembly; 2. Ensure the washer is correctly positioned and not twisted during assembly.

7

Curved Flat Piece

JQH-5×48-0037

Carbon Steel Q235 (Punched & Bent)

1. Fatigue deformation due to cyclic load; 2. Corrosion leading to reduced structural strength.

1. Inspect for deformation regularly; replace if bent; 2. Apply anti-rust coating in corrosive environments.

8

Retainer Ring 1

JQH-5×48-0035

Spring Steel 65Mn

1. Elastic fatigue due to repeated expansion and contraction; 2. Wear of the contact surface with other components.

1. Avoid repeated disassembly; replace if elasticity is lost; 2. Ensure the installation groove is smooth to reduce wear.

9

Capstan Nut

JQH-5×48-0033

Alloy Steel 45# (Thread Rolled)

1. Thread wear due to frequent adjustment and vibration; 2. Corrosion leading to thread seizure.

1. Lubricate the thread regularly with anti-seize lubricant; 2. Avoid over-tightening or loosening the nut excessively.

10

Connector

JQH-5×48-0032

Brass H62

1. Thread wear due to repeated assembly; 2. Corrosion in humid or corrosive environments.

1. Use a torque wrench for assembly to avoid thread damage; 2. Apply anti-corrosion tape to the thread in harsh environments.