John Deere 344J Wheel Loader Specs

The John Deere 344J Wheel Loader is a dependable mid-size compact loader designed for construction, landscaping, agriculture, and municipal work. Known for its strong lifting capacity, responsive hydraulics, and simple Tier 3 emissions system, the 344J offers reliable performance without the complexity of later Tier 4 aftertreatment systems.

Built for durability and ease of maintenance, the 344J remains a popular choice for fleet operators and independent contractors alike.

Engine & Power

• Engine: John Deere PowerTech™ 4045H diesel

• Displacement: 4.5L (276 cu in)

• Net Power: ~99 hp (74 kW)

• Emissions: Interim Tier 3 (no DPF)

• Fuel System: High-pressure common rail

Transmission

• Type: Hydrostatic transmission

• Drive: 4WD standard

• Features:

  • Smooth directional changes

  • Strong low-speed torque for loading

  • Excellent control for pallet handling

Hydraulic System

• System Type: Open-center hydraulic system

• Operating Pressure: ~3,600 psi

• Pump Type: Variable displacement piston pump

• Auxiliary Hydraulics: Optional for attachments

Common service items include:

• Hydraulic cylinder seal kits

• Hydraulic hoses and fittings

• Loader control valve components

Dimensions & Operating Weight

• Operating Weight: ~18,000 lb

• Bucket Capacity: 1.5–2.0 cu yd

• Hinge Pin Height: ~11 ft

• Overall Width: ~7 ft

Performance Highlights

• High breakout force for truck loading and stockpiling

• Spacious operator cab with excellent visibility

• Compatible with buckets, pallet forks, grapples, and snow attachments

• Durable articulation joint design

Common Maintenance Needs

• Engine oil and filter changes

• Fuel and air filter replacement

• Hydraulic fluid and filter service

• Axle oil and brake system inspection

Keep your loader operating efficiently with filter kits and reliable brake components.

Common Issues & Quick Fixes

1. Hydraulic Cylinder Leaks
Replace worn seals with quality hydraulic seal kits.

2. Hydrostatic Drive Performance Issues
Inspect hydrostatic filters and maintain proper fluid levels.

3. Articulation Pin Wear
Replace worn loader pins and bushings before frame damage occurs.

4. Brake Performance Reduction
Inspect wet brake system and replace worn components early.

Pro Tips

• Grease articulation and pivot points daily in high-cycle applications.

• Monitor hydraulic hose routing near articulation for wear.

• Address small hydraulic leaks quickly to protect the main pump.

Serial Number Information

The serial number plate is typically located on the left side of the frame near the articulation joint or inside the cab frame. Always verify your serial number before ordering parts to ensure proper fitment.