Hoisting Cylinder Repair Kit

1

O-ring

135×3.1

Nitrile Butadiene Rubber (NBR) 70 Shore A; superior oil resistance and tensile strength

1. High hydraulic pressure during heavy-load hoisting causes extrusion deformation; 2. Friction with reciprocating piston rods leads to surface wear.

1. Ensure the sealing groove is clean and free of burrs before installation; 2. Maintain hydraulic system pressure within the O-ring’s rated limit (≥16 MPa) to avoid extrusion damage.

2

O-ring

295×8.6

FKM (Viton) 75 Shore A; high-temperature resistance (up to 200°C) and chemical stability

1. Thermal cycling from hydraulic oil temperature fluctuations in long-term hoisting causes rubber cracking; 2. Contamination from industrial dust and metal particles abrades the O-ring surface.

1. Install a 10μm precision hydraulic oil filter to remove contaminants; 2. Store O-rings in a cool, dark, ozone-free environment to prevent premature aging.

3

O-ring

235×8.6

FKM (Viton) with reinforcing fiber; enhanced pressure resistance and dimensional stability

1. Uneven pressure distribution during hoisting start-stop causes localized wear; 2. Improper installation leads to stretching and material fatigue.

1. Use a non-metallic installation tool to avoid stretching the O-ring; 2. Maintain a compression ratio of 25-30% for optimal sealing and service life.

4

O-ring

270×5.7

Nitrile Butadiene Rubber (NBR) 70 Shore A; excellent elastic recovery

1. Long-term exposure to hydraulic oil causes rubber aging and hardening; 2. Small solid particles in the oil scratch the O-ring surface.

1. Replace hydraulic oil at recommended intervals (every 2000 working hours); 2. Clean the sealing groove thoroughly before installing the O-ring.

5

O-ring

φ180×5.7

Silicone rubber 65 Shore A; wide temperature range (-40°C to 180°C)

1. Cold start-up in low-temperature outdoor hoisting environments causes rubber brittleness; 2. Ozone exposure from electrical equipment nearby degrades the material.

1. Pre-heat the hydraulic system to above 0°C before start-up in cold climates; 2. Keep O-rings away from ozone-generating equipment during storage and installation.

1

Seal

CG17-95 ZYA110×100

Polyurethane (PU) with fabric reinforcement; high wear resistance and pressure resistance

1. High-pressure hydraulic oil causes extrusion of the seal lip; 2. Friction with the cylinder inner wall leads to lip wear.

1. Ensure the cylinder inner wall surface roughness is ≤ Ra 0.4μm; polish or replace worn cylinders promptly; 2. Apply a thin layer of hydraulic oil to the seal lip before installation to reduce initial wear.

2

Seal

CG17-95 ZYA215×200

Polyurethane (PU) with metal skeleton; enhanced structural stability and pressure resistance

1. Lateral forces from hoisting cylinder misalignment cause uneven wear; 2. Thermal aging from prolonged exposure to high-temperature hydraulic oil.

1. Check cylinder alignment regularly; correct misalignment exceeding 0.05mm to balance load distribution; 2. Monitor hydraulic oil temperature and avoid continuous operation above 120°C.

3

Seals for shaft

SWD01000

FKM (Viton) integrated with PTFE lip; low friction and high-temperature resistance

1. Friction with the rotating shaft causes lip wear; 2. Contamination from dust and metal particles embedded in the seal lip.

1. Install a dust cover on the shaft to prevent contamination; 2. Inspect the shaft surface for scratches and polish if necessary to ensure smoothness.

4

Model SITE seal

SWD02000

FKM (Viton) with reinforcing fiber; excellent chemical stability and wear resistance

1. Rapid pressure changes in the hoisting hydraulic system cause fatigue cracking; 2. Improper compression during installation leads to uneven wear.

1. Operate the hoisting system smoothly to avoid sudden pressure changes; 2. Torque the seal fastening bolts to the manufacturer’s specified value.

5

Abnormal seal for co-axles

GTD12600

NBR with special rubber compound; high elasticity and compatibility with co-axial movement

1. Co-axial movement causes repeated twisting and fatigue of the seal; 2. Corrosion from humid working environments.

1. Regularly inspect the seal for twisting and deformation; 2. Apply anti-corrosion lubricant to the seal surface in humid environments.

6

Seals for hole

SWD02000

PTFE with NBR backup ring; low friction and high-pressure tolerance

1. High-pressure hydraulic oil causes extrusion of the seal; 2. Contamination from metal particles in the hydraulic system accelerates wear.

1. Use a backup ring to prevent seal extrusion under high pressure; 2. Regularly replace the hydraulic oil filter to keep the system clean.

1

Dust-proofing ring

CY52-81 d100

Polyurethane (PU) with steel frame; high wear resistance and dust blocking capability

1. Continuous friction with the telescopic piston rod causes lip wear; 2. Small sand particles scratch the seal lip.

1. Regularly clean the piston rod surface and dust-proofing ring lip to remove accumulated debris; 2. Replace the dust-proofing ring promptly if lip wear exceeds 1mm.

2

Dust-proofing ring

CY52-81 d200

Polyurethane (PU) with steel frame; enhanced structural strength for large-diameter shafts

1. Impact from large debris (gravel, construction waste) causes lip deformation; 2. Corrosion from rainwater and humid environments.

1. Install a protective cover around the dust-proofing ring in harsh construction environments; 2. Apply anti-corrosion coating to the steel frame if used outdoors for a long time.

3

Dust-proofing ring

GP6-2600

NBR with fabric reinforcement; excellent flexibility and dust sealing performance

1. Long-term exposure to sunlight causes rubber aging and brittleness; 2. Friction with the piston rod leads to gradual lip wear.

1. Avoid direct sunlight exposure by installing a sunshade cover if possible; 2. Inspect the dust-proofing ring for aging cracks regularly during routine maintenance.