John Deere 624G Wheel Loader

The John Deere 624G Wheel Loader is a powerful mid-size production loader engineered for aggregate, site development, roadwork, and agricultural material handling. As part of Deere’s G-Series lineup, the 624G is recognized for its durable frame, dependable power shift transmission, and strong hydraulic performance—making it a workhorse in demanding environments.

Designed for high breakout force and efficient load cycles, the 624G balances productivity with straightforward serviceability.

Engine & Power

• Engine: John Deere 6068T diesel

• Displacement: 6.8L (414 cu in)

• Gross Power: ~130–140 hp (varies by configuration)

• Fuel System: Mechanical injection (early models)

• Emissions: Pre-Tier (no DPF/DEF systems)

The 6068T engine delivers strong torque output for truck loading and heavy stockpiling applications.

Transmission

• Type: Power Shift transmission

• Gears: 4 forward / 4 reverse

• Torque Converter: Heavy-duty

• Drive: 4WD

The power shift drivetrain provides smooth shifting under load and reliable pushing power for production work.

Hydraulic System

• System Type: Open-center hydraulic system

• Operating Pressure: ~3,000 psi

• Pump Type: Gear pump

• Lift & Tilt Cylinders: Dual-acting cylinders

Common wear and service components include:

• Hydraulic cylinder seal kits

• Hydraulic hoses and fittings

• Loader control valve parts

Dimensions & Operating Weight

• Operating Weight: ~27,000–29,000 lb

• Bucket Capacity: 2.5–3.5 cu yd

• Hinge Pin Height: ~12–13 ft

• Wheelbase: ~10 ft

Performance Highlights

• Strong breakout force for aggregate handling

• Durable articulation joint for heavy-duty use

• Wet-disc braking system for dependable stopping power

• Excellent visibility and operator comfort

Common Maintenance Needs

• Engine oil and filter service

• Fuel and air filter replacement

• Hydraulic oil and filter changes

• Axle oil and wet brake system inspection

Maintain peak performance with reliable filter kits and heavy-duty brake components.

Common Issues & Quick-Fix Solutions

1. Hydraulic Cylinder Leaks
✔ Install quality hydraulic seal kits to stop seepage and restore lifting performance.

2. Transmission Slipping or Harsh Shifting
✔ Check transmission fluid level and condition; inspect clutch packs and torque converter.

3. Wet Brake Wear or Oil Contamination
✔ Replace worn brake discs and inspect axle seals to prevent oil contamination.

4. Articulation Joint Wear
✔ Replace worn loader pins and bushings before excessive frame damage occurs.

Pro Tips

• Grease articulation pins and loader arm pivots daily in production environments.

• Inspect hydraulic hoses around articulation areas for abrasion.

• Address minor oil leaks promptly to avoid pump or transmission damage.

Serial Number Information

The serial number plate is typically located on the right-hand side of the frame near the articulation joint or inside the cab frame. Always verify the serial number before ordering parts to ensure correct fitment.