John Deere 640E Grapple Skidder – Parts, Specs & Repair Guide

Description:

The John Deere 640E Skidder is a powerful and efficient grapple skidder designed for heavy-duty timber extraction in commercial forestry operations. As part of the "E-Series," the 640E builds on the strength of previous generations with improved engine performance, a smoother powershift transmission, and a highly durable grapple system. This model is favored for its maneuverability, dependability, and simplified serviceability in harsh environments.

Key Specifications:

• Engine: John Deere 6068T, 6-cylinder turbocharged diesel

• Horsepower: 155 HP gross

• Transmission: 6-speed John Deere powershift with torque converter

• Brakes: Hydraulically actuated wet-disc

• Operating Weight: Approx. 28,000 lbs

• Grapple Opening: Up to 140 inches (depending on configuration)

• Tires: 30.5L x 32 forestry tires standard

• Fuel Capacity: 70 gallons

Hydraulic System:

• System Type: Closed-center, pressure-compensated

• Pump Flow: Approx. 50 GPM @ 2,200 RPM

• System Pressure: 2,800 PSI

• Functions: Grapple, blade, steering, and optional winch

Performance Features:

• Strong torque and consistent pulling power in all six gears

• Heavy-duty grapple arms with powerful clamping force

• ROPS/FOPS enclosed cab with improved visibility and joystick controls

• Articulated steering system with tight turning radius

Maintenance Essentials & Replacement Parts:

• Frequently replaced parts: grapple cylinder seal kits, brake discs, and transmission solenoids

• Steering orbitrol valves and cylinder seals are common wear items

• Regular replacement of filters: hydraulic, fuel, air, and transmission

• Blade bushings and pins typically wear out with continuous use

Common Issues and Fixes:

• Hydraulic lag in grapple: Often resolved by replacing worn-out control valves or low-pressure pump

• Transmission shift delays: May indicate solenoid wear or dirty fluid — flush and replace components as needed

• Brake pressure loss: Check for worn brake valve seals or plugged return lines

• Cab vibration or steering lag: Typically caused by failing orbitrol or unbalanced hydraulic flow

Pro Tip:

The John Deere 640E serial number is located on the frame rail near the front left tire or stamped on the engine block. Always verify before ordering to ensure accurate part fitment.