Model Spotlight

John Deere 350B Crawler Dozer: Specs, Parts & Common Issues

Produced 1971 – 1975, the John Deere 350B Dozer is the second-generation refresh of the original 350 — refined JD 3-cylinder diesel, improved hydraulic response, refined operator controls, and overall improved durability while maintaining the compact, maneuverable 350 frame. The 350B continued the long-running JD compact crawler line begun by the original 350 and set the chassis pattern for the 350C that followed in 1975.

Broken Tractor Editorial Team• Updated May 2026• 9 min read

The John Deere 350B Dozer is the second-generation refresh of the long-running John Deere 350 compact crawler dozer line, produced from 1971 through 1975. The 350B is the direct successor to the original John Deere 350 and brings refinements in power, hydraulic response, and overall durability while maintaining the compact, maneuverable 350 frame that earned the line its reputation for small farm and light commercial work.

For owners and operators today, the 350B is a refined compact JD crawler dozer in the sweet spot of small-class capability — bigger and more capable than the original 350, but lighter and easier to transport than the larger 450 family. The John Deere 3-cylinder diesel engine ecosystem makes the 350B supportable, and the simple mechanical drivetrain keeps service straightforward.

The 350B sits between the original 350 and the 350C The 350B is the middle of three pre-modern 350 generations: original 350 (1965 introduction), 350B (1971–1975), 350C (1975 – early 1980s). Each generation brought refinements in engine, hydraulics, and operator station. When sourcing parts, confirm 350 vs. 350B vs. 350C by serial — many components are sub-generation specific.

At-a-glance specifications

John Deere 350B Dozer — factory specifications

Production years: 1971 – 1975
Predecessor: John Deere 350 (original, 1965 introduction)
Successor: John Deere 350C (1975 – early 1980s)
Engine: John Deere 3-cylinder diesel
Power: ~45 horsepower flywheel (configuration dependent)
Transmission: Mechanical (multi-speed forward and reverse)
Hydraulics: Improved implement hydraulics vs. original 350
Operating weight: ~10,000 – 11,500 lb depending on configuration
Blade: Angle / tilt dozer blade options
Serial plate location: Right side of chassis frame or near operator station

How the 350B differs from the original 350

Improved engine output — refinements to the JD 3-cylinder diesel bumped power output a few HP over the original 350.
Refined hydraulics — improved hydraulic response and updated valve design.
Updated operator controls — refined control layout for better operator ergonomics.
Improved durability — strengthened components in the chassis, drivetrain, and undercarriage.
Same compact frame — the 350B retains the maneuverable 350 chassis dimensions.

John Deere 3-cylinder diesel engine

The 350B uses a refined version of the John Deere 3-cylinder diesel engine used on the original 350. Same fundamental engine architecture from the broader Deere “New Generation” diesel lineup, with refinements appropriate to the early 1970s production era. The 3-cylinder Deere diesel ecosystem is well-supported through both Deere dealer and aftermarket vintage tractor parts channels.

Routine engine service items: water pump, alternator, starter, fuel injection pump, injectors, head gasket, cylinder kits, bearings. Browse the John Deere Dozer Parts hub for current 350B engine service kits.

Transmission and drivetrain

The 350B uses a mechanical transmission with multiple forward and reverse speeds — same general drivetrain architecture as the original 350 with refinements for improved durability. Steering is by track-disconnect clutches.

Routine drivetrain wear items: clutch facing replacement, transmission gear and bearing service, steering clutch facings, final drive bearings.

Track undercarriage

The 350B undercarriage shares broad cross-fit with the original 350 and the 350C successor on multiple components. Sprocket bolt patterns, idler geometries, and master pin dimensions are 350-family specific — confirm by part number against your serial. Track chain elongation, sprocket tooth wear, roller seal failure, and idler bushing wear are routine items on a 50-year-old machine.

Browse the John Deere Dozer Parts hub for current 350B undercarriage availability.

Blade system and hydraulics

The 350B ships with an angle or tilt dozer blade — hydraulically actuated. The 350B introduced refined hydraulic valving relative to the original 350 — improved valve response. Blade cylinders, blade-carrier hardware, and cutting edges are routine service items.

Common service items on the 350B

Engine accessory aging

Water pump, alternator, starter, fuel injection pump, and injectors on the JD 3-cyl diesel are routine service items on 50-year-old engines.

Clutch and steering clutch service

Main engine clutch and steering clutches wear with use. Replacement clutch facings, springs, and pressure plate service are routine.

Track undercarriage replacement

Track chain, sprocket, idler, and roller wear are all routine on 50-year-old undercarriage. Aftermarket replacement components are available.

Hydraulic seal failure

Blade cylinder seals fail with age. Cylinder rod chrome corrosion and seal weep are typical.

Operator station

Original seat cushions, floorboard wear, and the lack of factory ROPS on most early units. Aftermarket ROPS during restoration is common for safety.

Wiring and electrical

50-year-old wiring harnesses are routinely degraded.

Parts and cross-fit components for the John Deere 350B

Component area	What to look for	Notes
Sprockets & segments	Compact-class track sprocket assemblies, bolt-on segments	Cross-fits 350 / 350C family.
Idlers & rollers	Front idler assemblies, top and bottom roller sets	Compact JD crawler undercarriage.
Track recoil & adjusters	Recoil spring, adjuster yoke, chrome rod	Confirm by serial.
Master pins	Track master pin and bushing	350-family specific.
Blade cutting edges	Compact cutting edges, end bits	Aftermarket cutting edges widely available.
Blade cylinder seal kits	Angle, tilt, lift cylinder seal kits	Confirm cylinder dimensions before ordering.
Engine clutch & steering clutch parts	Clutch facings, springs, pressure plates	Routine wear items on the 350B drivetrain.
Engine accessory parts (JD 3-cyl diesel)	Water pump, alternator, starter, fuel injection	John Deere 3-cylinder diesel parts ecosystem.
Radiators & cooling	Radiator cores, fan belts, hose sets	350B cooling system.
Filter service kits	Engine oil, fuel, air filter sets	Vintage JD filter kits.
Operator seat	Vintage tractor seat with mount	Universal vintage tractor seats fit with adapter brackets.

For 350B parts inventory and cross-fit confirmation, browse the John Deere Dozer Parts hub or contact our parts desk directly.

Working on a John Deere 350B?

The 350B is the second-generation refresh of the long-running JD 350 compact crawler line. Our specialists can verify 350 / 350B / 350C sub-generation by serial and help source vintage JD 3-cylinder engine and undercarriage parts.

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Why the 350B is still in service

The 350B continues to serve small farm operators, orchards, hobby restorers, and light commercial users where a compact JD crawler dozer is the right tool. The combination of refined JD 3-cylinder diesel reliability, improved hydraulics over the original 350, simple mechanical drivetrain, and broad parts availability makes the 350B one of the most supportable vintage compact crawler dozers in the JD line.

Broken Tractor Editorial Team

This spotlight was compiled from factory John Deere service literature for the 350B Crawler Dozer, JD operator’s manuals, CNH/Deere parts catalogs, and the verified BigCommerce catalog at brokentractor.com.