John Deere 644K Wheel Loader Specs

Category: Wheel Loaders ➔
Manufacturer: John Deere ➔
Model: 644K ➔

The John Deere 644K is a wheel loader designed for material handling, loading, stockpiling, and general construction applications. It is part of John Deere's K-Series wheel loader lineup and is commonly used in aggregate yards, construction sites, agriculture, and industrial material handling. The 644K features a diesel engine, articulated steering, and a front-mounted loader bucket for moving soil, gravel, sand, and other bulk materials. Typical configurations may include general-purpose, multi-purpose, or high-capacity buckets, along with optional attachments. The model is known for its use in demanding loading cycles where productivity, visibility, and maneuverability are important.

General Specifications

John Deere 644K Wheel Loader General Specifications specifications
Bucket Capacity	4.0 - 4.25 (3.1 - 3.2) — Starting 2019 Model Year
Engine Power	232 (173) — Starting 2019 Model Year
Engine type	Deere PSX 6090 — Starting 2019 Model Year
Max Dump Height	9.7 (2.9) — Starting 2019 Model Year
Operating Weight	41,188 (18,682) — Starting 2019 Model Year

Bucket

John Deere 644K Wheel Loader Bucket specifications
Breakout Force	33,903.00 lbs (15,378.16 kg)
Bucket Capacity - Smallest	4.10 cu yd (3.13 cu m)
Dump Clearance at Max Raise	9.50 ft (2.90 m)
Largest bucket capacity	4.20 cu yd (3.21 cu m)

Capacities

John Deere 644K Wheel Loader Capacities specifications
Heaped Capacity	4.20 cu yd (3.21 cu m)
Hydraulic Tank	27.80 gal (105.22 l)
Transmission	6.10 gal (23.09 l)

Dimensions

John Deere 644K Wheel Loader Dimensions specifications
Height - Top of Cab	11.30 ft (3.44 m)
Hinge Pin - Max Height	13.60 ft (4.15 m)
Length with Bucket on Ground	27.30 ft (8.32 m)
Reach at Max Lift and Dump	5.30 ft (1.62 m)
Turning Circle	43.60 ft (13.29 m)
Wheelbase	10.70 ft (3.26 m)
Width Over Tires	9.50 ft (2.90 m)

Driveline

John Deere 644K Wheel Loader Driveline specifications
Differential lock	Front- Locking Rear- Open
Parking Brake Type	Wet Multi Disc - Transmission
Ride control system	Optional
Service Brake - Location	Axle Inboard
Service Brake Actuation	Hydraulic
Service Brake Type	Wet Disc
Tire size - Standard	23.5 R25

Engine

John Deere 644K Wheel Loader Engine specifications
Alternator	130 amps
Displacement	549.30 cu in (9,001.43 cu cm)
Emission level	Tier 4
Engine Make	John Deere
Engine Model	PowerTech PSS 6090
Engine Output-Net	232.00 hp (173.01 kw)
Make	Deere PowerTech
Net Power	232.00 hp (173.01 kw)
Pump	Piston
Rated Speed	1700 rpm
System Voltage	24 V
Torque	783.30 lbs ft (1,062.00 nm)
Torque Rise	56%
Transmission Type	Powershift

Operating Specifications

John Deere 644K Wheel Loader Operating Specifications specifications
Front Axle/Diff Fluid Capacity	5.90 gal (22.33 l)
Fuel Capacity	104.90 gal (397.05 l)
Operating Weight	41,186.80 lbs (18,682.04 kg)
Rated Bucket Capacity	4.00 cu yd (3.06 cu m)
Rear Axle/Diff Fluid Capacity	5.90 gal (22.33 l)

Transmission

John Deere 644K Wheel Loader Transmission specifications
Pump Flow	78.50 gpm (297.12 lpm)
System Pressure	251.7 psi

Weights

John Deere 644K Wheel Loader Weights specifications
Operating Weight	41,188.00 lbs (18,682.59 kg)

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