John Deere 748G-III Skidder – Specs, Parts & Maintenance Guide

The John Deere 748G-III Skidder is a powerful and dependable dual arch grapple skidder built for heavy-duty logging operations. Known for its strong pulling capacity, rugged axles, and reliable hydraulic system, the 748G-III is a go-to choice for professional loggers. It features an ergonomic cab design, heavy-duty components, and a straightforward maintenance layout that ensures long-lasting performance in tough terrain.

Engine Specs:

• Make: John Deere

• Model: 6068T

• Type: 6-cylinder, turbocharged diesel

• Displacement: 6.8 Liters

• Power Output: 185 HP (138 kW)

• Cooling System: Side-by-side radiator and oil cooler

Transmission & Axles:

• Type: Powershift

• Gears: 6 forward / 3 reverse

• Differentials: Locking front and rear

• Final Drive: Heavy-duty outboard planetary

• Brakes: Wet disc brakes

Hydraulic System:

• Pump Flow: 45–50 GPM (approx.)

• System Pressure: 2,500–2,800 psi

• Control: Lever or joystick-controlled, depending on configuration

• Grapple Options: Dual arch with rotation, tong-style grapple

Dimensions & Weight:

• Operating Weight: ~38,000 lbs

• Length: 25.6 ft

• Width: 10.4 ft

• Height (Cab): 11.1 ft

• Ground Clearance: 24 in

Performance Highlights:

• High torque engine and durable powershift transmission

• Strong dual arch boom design for stable, efficient log control

• ROPS/FOPS-certified cab with wide visibility and heat/AC

• Proven reliability in steep slopes and muddy conditions

Maintenance & Common Issues:

• Frequent Maintenance Parts:

  • Brake Discs and Kits

  • Grapple Cylinder Seals

  • Hydraulic Pumps and Valve Kits

• Common Issues:

  • Transmission lag or slipping – often corrected by checking clutch packs or control pressure

  • Hydraulic leaks near grapple or boom – replace cylinder seals or worn hoses

  • Brake fade – install new wet brake discs or adjust actuator settings

Pro Tips:

• Keep transmission fluid clean and check clutch pressures during seasonal maintenance

• Replace grapple bushings to reduce excessive play and premature wear

• Clean cooling system fins regularly to avoid engine overheating

Serial Number Location:
The serial number plate is located on the right-hand frame rail near the front tire or under the operator’s cab. Serial numbers begin with DW748G3 followed by a 6-digit unit ID.