John Deere 903G Feller Buncher – Specs, Parts & Repair Info

Description:

The John Deere 903G Feller Buncher is a powerful, track-mounted forestry machine designed for high-production felling in tough timber conditions. As part of Deere’s popular “G-Series,” the 903G combines brute strength, smooth hydraulic response, and advanced operator comfort in a highly durable package. With its wide leveling undercarriage and strong swing torque, the 903G delivers unmatched performance on steep or uneven terrain while remaining easy to service in the field.

Key Specifications:

• Engine: John Deere 6090H, 9.0L 6-cylinder turbocharged diesel

• Horsepower: 300 HP (net)

• Undercarriage: Wide-body leveling track system

• Operating Weight: Approx. 75,000 lbs (with head)

• Boom Reach: Up to 30 feet (varies by attachment)

• Fuel Tank Capacity: 160 gallons

• Hydraulic Tank Capacity: 90 gallons

Hydraulic System:

• System Type: Load-sensing, pressure-compensated

• Main Pump Flow: 180 GPM

• System Pressure: Up to 5,500 PSI

• Controls: Smooth, proportional joystick control for all boom, head, and travel functions

Performance Features:

• Dual swing motors for high torque and balanced motion

• Excellent stability with fully adjustable leveling undercarriage

• Reinforced boom and frame structure for harsh environments

• Spacious, pressurized cab with climate control and full visibility

Maintenance Essentials & Replacement Parts:

• Common replacement parts: boom and stick cylinder seal kits, swing gearbox rebuild kits, undercarriage rollers and idlers, and travel motor cartridges

• Engine and hydraulic filter kits must be changed per 250-hour service intervals

• Track components like sprockets, tensioners, and bottom rollers often wear in rocky terrain

• Known electrical wear points include joystick harnesses and tilt sensor wiring in the cab

Common Issues and Fixes:

• Travel power loss or jerky motion: Usually related to failing travel motor or clogged case drain filter

• Boom drift or weak swing: Caused by low system pressure or valve block leakage

• Warning lights or engine derate: Typically due to DEF sensor failure or emissions buildup — clean and recalibrate

• Track tension loss: Rebuild or replace track tensioning cylinders and seals

Pro Tip:

The John Deere 903G serial number is located on the left side of the main frame near the swing bearing and also on the engine tag. Confirm your serial before ordering for accurate part fit.