John Deere 748L Grapple Skidder – Specs, Parts & Common Repairs

Description:

The John Deere 748L Grapple Skidder is a heavy-duty, four-wheel-drive forestry skidder built to dominate steep grades, deep mud, and high-volume log skidding operations. As part of the advanced L-Series, the 748L features a powerful Final Tier 4 engine, Continuously Variable Transmission (CVT), and a redesigned cab for unmatched operator comfort. With a larger grapple, reinforced axles, and JDLink™ integration, this model is engineered for modern, high-output forestry applications.

Key Specifications:

• Engine: John Deere PowerTech™ PSS 6068, 6.8L Tier 4 Final turbocharged diesel

• Horsepower: 200 HP (149 kW)

• Transmission: CVT (Continuously Variable Transmission) with automatic load response

• Brakes: Dual-circuit, oil-cooled wet disc brakes

• Operating Weight: Approx. 42,100 lbs

• Grapple Size: 140–160 inches (varies by attachment)

• Tires: 30.5L x 32 or dual tire options

• Fuel Capacity: 99 gallons

• DEF Capacity: 5 gallons

Hydraulic System:

• Type: Load-sensing, pressure-compensated

• Pump Flow: Approx. 57 GPM

• System Pressure: Up to 3,600 PSI

• Functions: Grapple, blade, steering, optional winch

Performance Features:

• CVT delivers smooth transitions and automatic speed/torque balance

• Heavy-duty center joint and final drives for extended life under load

• Spacious CommandView™ III cab with CommandCenter™ display and joystick controls

• JDLink™ and TimberNavi™ enabled for real-time machine data and mapping

• Advanced HVAC and reduced in-cab noise levels for all-day operator comfort

Maintenance Essentials & Replacement Parts:

• Common service items: grapple cylinder seal kits, brake discs, CVT filter kits, and steering valve rebuild kits

• Hydraulic, fuel, DEF, and engine filter kits should be replaced every 250 hours

• Blade bushings and pins wear quickly with frequent grading

• CVT-related components, such as sensors and solenoids, are high-wear in high-hour units

Common Issues and Fixes:

• Transmission lag or jerking: Usually caused by a faulty CVT sensor or worn clutch component

• Hydraulic grapple delay: Check for worn valve block seals or low system pressure

• Brake fade or slow response: Replace worn wet brake discs and flush hydraulic brake system

• DEF faults or derates: Clean or replace DEF injector and check tank heater function

Pro Tip:

The John Deere 748L serial number is located on the frame near the articulation joint and on the engine block. Always confirm your serial before ordering parts—especially for CVT, DEF, and axle components.