John Deere 350B Crawler Loader – Compact Track Loader

The John Deere 350B Crawler Loader was produced from 1971 to 1975 as a follow-up to the original 350 loader. With improved durability, better operator controls, and stronger hydraulic systems, the 350B earned a reputation as a reliable, easy-to-service machine for small to mid-size excavation and material-handling jobs.

Powered by a John Deere 152-cubic inch, 3-cylinder diesel engine, the 350B delivers approximately 42–48 horsepower, channeled through a dry clutch and 8-speed gear transmission. It features an open-center hydraulic system, a reinforced loader frame, and a one-yard bucket capacity, making it ideal for trenching, loading, and site prep in tight areas.

Operators value its compact build, strong pushing force, and parts interchangeability with other Deere 350-series machines. Today, the 350B remains popular with independent contractors, farmers, and equipment restorers.

Key Specifications:

The 350B loader uses the John Deere 152-cu in diesel engine, rated at 42 to 48 HP at 2500 RPM, depending on configuration. It comes with a dry-type clutch and 8-speed gear-drive transmission with four forward and four reverse gears.

The hydraulic system is open center, delivering around 11–13 GPM, enabling smooth loader operation. Bucket capacity ranges from 0.75 to 1.0 cubic yards.

Operating weight is typically 10,500 to 11,000 lbs, depending on bucket type and counterweights. Standard features include 5 bottom rollers per side, 12-inch track shoes, and a 48-inch track gauge.

Serial Number Information:

The John Deere 350B Crawler Loader shares its serial number range with the 350B Dozer.

• 1971: Starts at 110000

• 1972: Starts at 112743

• 1973: Starts at 117284

• 1974: Starts at 124315

• 1975: Starts around 133000

Serial Number Location: Check the left frame rail, just behind the front track, or under the operator’s platform for the identification plate. Use this number to verify compatibility for engine, hydraulic, and undercarriage parts.

Key Features:

• Upgraded Engine Power: More responsive than the original 350, with better torque under load.

• Heavy-Duty Loader Frame: Improved lift arms and pivot pins handle rough digging and repetitive loading.

• Simplified Gear Drive: The 8-speed manual transmission offers dependable performance in varied conditions.

• Operator Visibility & Control: A low-profile hood and improved seat position allow better view of the bucket.

• Modular, Easy-to-Repair Design: Easy access to clutch housing, hydraulics, and loader pins for fast service.

Common Replacement Parts:

Maintain peak performance with these commonly replaced 350B loader components, all available from Broken Tractor:

• Engine: Pistons, sleeves, head gaskets, water pumps, and complete overhaul kits

• Clutch & Transmission: Pressure plates, clutch discs, throwout bearings, and gear sets

• Undercarriage: Track chains, rollers, idlers, recoil springs, and sprockets

• Hydraulics: Lift cylinders, tilt cylinders, cylinder seal kits, hoses, and loader control valves

• Loader Frame & Bucket: Bucket pins, bushings, cutting edges, and pivot arms

Maintenance Schedule:

Perform engine oil and filter changes every 100 hours. Replace fuel filters every 200 hours, and change transmission fluid every 250 hours. Inspect and grease all loader pivot pins every 10 hours of use, and inspect track tension weekly. Hydraulic system components should be inspected and flushed every 250 hours, with full cooling system service recommended annually or every 1,000 hours.

Common Issues & Fixes:

• Loader Bucket Drooping or Slow Movement: Likely caused by worn hydraulic seals or pump wear — rebuild with a hydraulic seal kit.

• Clutch Slipping or No Engagement: Worn friction plates or pressure plate fatigue — replace with a clutch rebuild kit.

• Tracks Skipping or Misaligned: Check for worn track chains or recoil spring failure — undercarriage parts are available as full kits or individual components.

• Overheating Under Load: Often due to clogged radiator or failed water pump — inspect cooling fins and replace water pump if needed.