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Engineered Bushings: Applications & Industries

Industries where HEF Sleeve Bearings are prevalent:

Examples of Engineered Bushing Applications:

Application

Conventional Solution

HEF Solution

Arm, bucket and cylinder joints of wheel loaders

Pin: induction hardened or case hardened steel

Bearing: case hardened steel or bronze

Problem: Seizure and Wear

Pin: PEL-ST case hardened steel

Bearing: PEL, PEL BH or PEL T (depending of the location of the joint and of the size of the wheel loaders)

Arm, bucket and cylinder joints of wheel loaders
Joints of front loaders for agricultural tractors: cylinder, bucket, fork, etc.

Pin: Treated steel core hardness 950-1100 MPa

Bearing: Wrapped bearings - bronze, SY or DX

Problem:
Abrasive wear of the bushings and corrosion of the pin

Pin: PEL–ST or PEL–STC

Bearing: PEL T

Result: Lifetime increase: 3x

Joints of front loaders for agricultural tractors: cylinder, bucket, fork, etc.

The heaviest loaded joints on excavators (Boom foot, Boom cylinder foot, pivot, stick nose) and the joints of the bucket linkage

Pin: induction hardened steel + hard chromium

Bearing: case hardened steel or bronze

Problem: seizure after hundreds of hours and wear

Pin: Induction hardened steel + hard chromium or Induction hardened steel only

Bearing: PEL or PEL BH or PEL BH2

Results:
  • Lifetime increase: several thousand hours
  • Increase of lubrication interval (up to 1000 hours with PEL BH)
the heaviest loaded joints on excavators (boom foot, boom cylinder foot, pivot,stick nose) and joints of the bucket linkage

Joints on front axles of trucks

Ball bearings ⇒ failure due to vibrations and breakages due to shock loads

Pin: Induction hardened steel

Bearing: PEL (flanged PEL bushings at the top and normal PEL bushings at the bottom)

Joints on front axles of trucks

Front axle joints on agricultural tractors

Pin: Hardened pin (55 HRC) + hard chromium coating

Bushings: Carburised bushing

Problem: Scuffing of the joints due to a random greasing and important wear

Pin: Hardened pin (55 HRC) + hard chromium coating OR Nitrided pins

Bushing: PEL BH

Results: Increase of the greasing interval (every 300 hours) and increase of joint lifetime

front axle joints on agricultural tractors

Several plow joints: jacks, mouldboard joints, front furrow width and plow alignment joints

Pin: Treated steel core hardness 950-1100 MPa

Bearings: Massive bearings: woven bearings (Orkot), bronze

Wrapped bearings: Wieland, SY (Glacier), spring steel bearings

Problem: Abrasive wear of polymer/ bronze bushings or seizure of the steel bearings

Pin: PEL–ST or treated steel 950-1100 Mpa core hardness

Bearing: PEL BH or PEL T

Result: Lifetime increase: 3x

several plough joints: jacks, mouldboard joints, front furrow width and plough alignment joints
Plow Joints

Joints of rollers and of chain links on metallic deck conveyors

Pin: Case hardened steel

Bearing: Case hardened steel or bronze bushings with regular lubrication or roller bearing

Problem:
  • Bushings: fast wear and lubrication required
  • Roller bearing: Breaking because of shocks and abrasive particles
  • Pins: Occasional breakages due to shocks

Pin: PEL–ST

Bushing: FAM Bushing - maintenance free after initial lubrication

Results:

  • 5x increase of lifetime
  • No more occasional breaking of the pins
  • No more regular lubrication (reduction in maintenance costs)
Joints of rollers and of chain links on metallic deck conveyors

Pins and rollers on garbage compressing devices on rear loader garbage trucks

Pin: heat treated steel + hard chromium

Roller: copper-aluminium alloy bushing mounted on induction hardened steel roller

Problem:
  • Wear of the shaft due to friction under high loads
  • Heavy corrosion of the shaft and roller
  • Blockage of the joint and difficulty in dismounting the shaft for replacement after 3 months of use

Pin: PEL–STC

Roller: Massive PEL-BH roller - price reduced by 30% (bushings suppression)

Result: No blockage of the joint for last two years: reduction of maintenance costs and important image benefit

Pins and rollers on garbage compressing devices on rear loader garbage trucks

Dustbin handling system joint bearings

System used to catch the container and system to reverse the dustbin into the truck container

Pin: Unhardened steel

Bearing: Sintered bronze or massive bronze

Problem: Rapid wear due to abrasive surrounding

Pin: PEL–HL

Bearing: PEL (on the reverse system) and PEL T (on the catch system)

Dustbin handling system joint bearings. System used to catch teh container and system to reverse the dustbin into the truck container

Arms and driving cylinders joints of Brush Cutters

Pin: Unhardened steel

Bearing: Massive bronze or wrapped bushings

Problem: Abrasive wear on pins and bushings and on some joints. Plastic deformation of the bushings due to high load

Pin: PEL–ST

Bearing: PEL; PEL BH or PEL T (depending of the user)

Result:Lifetime increase: 4x

Arms and driving cylinders joints of Brush Cutters

Joints of cable-operated clamshell bucket

Pin: Case hardened steel

Bearing: Case hardened steel bushings or standard 100 Cr6 spherical bushings

Problem: Seizure and wear and sometimes breakage of the outer ring of the spherical bushings

Pin: Superficial quenched pins

Bearing: FAM or PEL PH spherical bushings

Result:Lifetime increase: 2x

Only initial greasing required

Clamshell bucket joints

Pivot joint arm on container stacker for port handling

Pin: Nitrided steel

Bearing: Carburised spherical plain bearing

Problem: Cost of the spherical plain bearing.

Corrosion and fretting corrosion of the pin which could lead to dismantling problems

Pin: PEL–STC

Bearing: PEL BH (with re-machining of the casting frame to decrease tolerances)

pivot joint on container stacker for port handling
Container Stacker Joints

Front hitches joints of agricultural tractors

Pin: Unhardened steel

Bearing: Wrapped bushings

Problem: Abrasive wear due to dusty surrounding

Pin: PEL–ST

Bearing: PEL T

Result:Lifetime increase: 2x

front hitch joints of agricultural tractors
Agricultural Tractor Joints

Joints on grapples

Pin: Case hardened steel

Bearing: Case hardened steel or spring steel bushings

Problem: Seizure and wear

Pin: Case hardened steel

Bearing: PEL
or PEL T

joints on grapples

Several joints of hydraulic crushers

Pin: Case hardened steel

Bearing: Case hardened steel

Problem: Seizure and wear

Pin: Case hardened steel

Bearing: PEL

several joints of hydraulic crushers

Bushings of rod end cylinder for hydraulic hammer used in mining application

Pin: Hardened steel 48-50 HRC

Bearing: Carburised steel

Problem: Scuffing and then wear after several hundred hours of operation

Pin: Hardened steel 48-50 HRC

Bearing: PEL C - BH

Result: No scuffing after more than 1000 hours of operation

bushings of rod end cylinder for mining application

Joints of various parts of the shoe-brake linkage from cylinder to wheel rim, for underground cars and freight trains

Pin: Case hardened steel

Bearing: Case hardened steel

Problem: Seizure and wear

Pin: Case hardened steel

Bearing: PEL

joints of various parts of the shoe-brake linkage from cylinder to wheel rim, for underground cars and freight trains

Joints for position of ground cutter on sugar beet harvester

Pin: Induction hardened steel or nitrided steel

Bearing: Case hardened steel

Problem: Wear and fretting corrosion

Pin: PEL–ST

Bearing: PEL (without cross-hatches)

Result: Lifetime increase: 2x

Joints for position of ground cutter on sugar beet harvester

Joints of the twine knotters’ device on straw or hay balers

Pin: Nitrided steel

Bushings: Wrapped bronze bearings (Wieland)

Problem: Abrasive wear of the bushings. Plastic deformation under high loads

Pin: Nitrided steel

Bushings: PEL

Result: Lifetime increase: 2x

Joints of the twine knotters' device on straw or hay balers
Twine Knotter Joints