Undercarriage

Features and Benefits

Features and Benefits: All-Makes Product Information

All-Makes Lubricated Chain

· Lubricant eliminates internal pin & bushing joint wear

· Quieter running

· Helps eliminate "snakiness" to aid in chain guiding

· Split link allows easier removal & installation of chain

· Links are deep heat treated through the wear limit for long wear life

· Links retain the press fit so a second set of pins and bushings may be used if appropriate

· Bushing O.D. life is 50% greater than sealed track bushing, when proper track sag is maintained

All-Makes Sealed Chain

· All-Makes links are deep heat-treated through the wear limit for long wear life

· Belleville seals increase pin/bushing internal wear life over unsealed chain by 30%

· Links retain the press fit so a second set of pins and bushings may be used if appropriate

Track Links

· High-core hardness

· Deep hardened at the rail surface

· Non-strutted links will clean out faster and minimize material build-up in chain

· Forged from deep-hardening steel

· Superior to plain carbon steel

· Thru-hardened to provide high-core hardness to maintain pin & bushing retention

· Rail surface is induction-hardened through the wear limit to maximize wear life

· Furnace tempering reduces link chipping and cracking

· Precision machined for pin/bushing and shoe retention

Split Master Links

· Allows easy removal & installation of chain

· Same wear life as regular link

· Forged from deep hardening steel

· Superior to plain carbon steel

· Same special heat treatment as regular links

Track Pins

· O.D. sized to a close tolerance for accurate press fit

· Induction-hardened O.D.

· Furnace-tempered for increased bending strength

· Provides oil reservoir for lubricated chain

· Made from medium carbon steel

· Induction-hardened O.D. for maximum wear life

Track Bushings

· O.D. sized to a close tolerance for accurate press fit

· Carburized to make bushing suitable to induction-hardening (increases carbon content)

· Induction-hardened O.D. & I.D.

· Stepped bushings provide more wear life

· Low carbon alloy steel

· Carburized for optimum core toughness to resist cracking

· Induction-hardened O.D. & I.D. for maximum wear life and retention in track links

· Excavator bushings are thru-hardened for maximum toughness to resist heavy impacts

Track Bolts

· High strength to resist shoe loosening

· Rolled thread form

· Domed head for increased wear life

· Made from high strength steel

· One of highest strength fasteners in the industry; far exceeds grade 8 strength bolt

· 174,000 PSI minimum tensile strength

· Rolled threads provide a stronger thread form than cut threads

Track Nuts

· High strength

· Square nut for self-holding in the track link seat

· Matches strength requirements with bolt

Lubricated Chain Seals

· Retains oil between pin and bushing

· Keeps out contamination

· Stays flexible in all temperature ranges

· Polyurethane sealing lip

· Special rubber compound load member resists effects of oil contact

Track Roller Shell

· Hardened on the O.D.

· Hardened flanges resist bending

· Precision-machined for press fit of bushings

· Forged from deep-hardening steel

· Superior to plain carbon steel

· Deep-hardened to provide a good core hardness to resist loose bushings

· Deep-hardened on the O.D. for maximum wear life

· Tempered to resist cracking, chipping

Track Roller Front Idler and Carrier Roller Seals

· Seals oil in and contamination out

· Outlasts roller shell wear life

· Forged metal seal rings with special corrosion resistant chemistry

· Rubber load rings stay flexible in all temperature ranges; will not get in colder

Temperatures and cause an oil leak

Carrier Roller Shell

· Induction-hardened on O.D. for long wear life

· Cast iron for smaller sizes D3, 450 through 650G

· Forged steel for larger sizes D4, D5, 750

· Induction-hardened on O.D. for long wear life

Sprockets

· Induction-hardened ring and dish sprockets

· Thru-hardened sprocket segments

· Hunting tooth design (odd number of teeth) extends wear life of teeth

· High hardenability cast steel

· Deep induction-hardened pattern on entire tooth profile for long wear life

· Tempered to resist cracking, chipping

Front Idlers

· Induction-hardened tread diameter

· Tread life exceeds link wear life

· High center guide flange

· Induction-hardened on treat for long wear life

· Tempered to resist cracking, chipping

· Cast steel or steel-fabricated for all idlers

Track Shoes

· Limited back bending of chain allowed for increase life of pins and bushings

· Overlap from shoe to shoe

· Controlled flatness to resist loosening

· Rolled section made from deep hardening steel

· Thru-hardened to maximize wear life

· Tempered to resist breaking

Component Material & Type of Heat-Treat

For your quick reference, listed below are the John Deere All-Makes Undercarriage Components showing type of steel and heat-treat processes used in their manufacture.

Links (All Crawlers/Excavators)

· Forged with medium carbon steel

· Body hardened heat-treat for an RC30 core hardness

· Induction-hardened wear surface

· Furnace tempered, to minimize link chipping

Pins (All Crawlers/Excavators)

· Made from medium carbon steel barstock

· High manganese alloy for hardenability

· O.D. held to a close tolerance for good press fit

· Induction-hardened for hard wear surface

· Furnace-tempered for good bending strength

Bushings (All Crawlers)

· Made from low carbon steel

· O.D. held to a close tolerance for good press fit

· Carburized for hardness and toughness

· Induction hardened I.D. and O.D. for hard wear surface

Bushings (All Excavators)

· Made from medium carbon steel round stock

· O.D. held to a close tolerance for good press fit

· Thru-hardened heat treatment to resist cracking during high-impact loads

Roller Shells (All Crawlers/Excavators)

· Forged with medium carbon steel

· Differential quench heat treat for good tread wear

Carrier Roller Shells (All Crawlers/Excavators)

· Forged with medium carbon alloy steel; or cast steel one-piece shell

· Induction-hardened wear surface

Sprockets (Ring-Type, All Crawlers/Excavators)

· Cast steel (ring-type)

· Tooth profile accurately as cast in the mold

· Induction-hardened tooth wear surface

Sprockets (Segments, All Crawlers/Excavators)

· Forged from medium carbon steel

· Accurately forged tooth profile

· Thru-hardened heat treatment

Front Idlers (All Crawlers/Excavators)

· Welded/cast construction

· Induction-hardened wear surface

Track Shoes (All Crawlers)

· Rolled section of deep hardening, medium carbon steel

· Thru-hardened heat-treatment