John Deere 703J Feller Buncher – Specs, Parts & Common Fixes

Description:

The John Deere 703J Feller Buncher is a high-performance tracked forestry machine designed for selective cutting and clear-cut logging. With smooth hydraulics, a compact frame, and a powerful engine, the 703J is ideal for tight stands, steep slopes, and mixed timber conditions. Its leveling cab, fuel-efficient engine, and strong boom make it a versatile and reliable machine for demanding logging operations.

Engine Specs:

• Make: John Deere PowerTech™

• Model: 6068H

• Type: 6-cylinder, turbocharged diesel

• Displacement: 6.8 Liters

• Power Output: 220 HP (164 kW)

• Emissions Tier: Tier III

Hydraulic System:

• Pump Flow: Dual variable displacement piston pumps

• System Pressure: 5,000 psi (345 bar)

• Control System: Electrohydraulic with smooth multi-function control

• Attachment Compatibility: Commonly used with Waratah and John Deere felling heads

Undercarriage & Travel:

• Track Type: Heavy-duty forestry undercarriage

• Track Length: Approx. 14 ft

• Ground Clearance: 23 in

• Travel Speed: Up to 3.2 mph

• Leveling Cab: Factory-installed for improved stability on slopes

Key Dimensions & Weight:

• Operating Weight: ~62,000 lbs

• Overall Length: 33 ft

• Width (Standard): 11 ft 2 in

• Height (Cab Top): 12 ft

Performance Highlights:

• Tight turning radius and compact body for dense stands

• Reliable swing torque for fast cycle times

• Excellent stability on slopes with leveling cab

• Operator-friendly cab with ergonomic controls and visibility

Maintenance & Common Issues:

• Frequent Maintenance Parts:

  • Boom Cylinder Seal Kits

  • Swing Motor and Gearbox Components

  • Feller Head Wear Parts

• Common Issues:

  • Cab leveling system faults – check actuators and position sensors

  • Hydraulic pump wear – noticeable in reduced boom speed

  • Swing drift – usually related to worn swing motor seals

Pro Tips:

• Perform regular calibration on the cab leveling system for stability

• Monitor pump temps using JDLink™ to catch early overheating signs

• Keep feller head blades sharp and well-greased to avoid stalling

Serial Number Location:
Serial number plate is located on the main frame under the cab or near the swing bearing. Format begins with 1DW703J followed by 6-digit serial number.