The John Deere 644K is a wheel loader designed for material handling, stockpiling, loading, and general construction applications. It is part of John Deere's K-Series wheel loader line and is commonly used in aggregate yards, construction sites, agriculture, and industrial material movement. The 644K features a front-end loader configuration with articulated steering, a hydraulic lift system, and a bucket attachment for moving soil, gravel, sand, and other bulk materials. Typical specifications include a diesel engine, four-wheel drive, and an operator cab with controls for loader functions. The model is recognized for versatility, productivity, and compatibility with multiple worksite attachments.
General Specifications
John Deere 644K Wheel Loader General Specifications specifications
Bucket Capacity
4.0 - 4.25 (3.1 - 3.2) - Starting 2019
Engine Power
232 (173) - Starting 2019
Engine type
Deere PSX 6090 - Starting 2019
Max Dump Height
9.7 (2.9) - Starting 2019
Operating Weight
41,188 (18,682) - Starting 2019
Bucket
John Deere 644K Wheel Loader Bucket specifications
Breakout - Bucket
15378 (33903) kgf (lbf)
Bucket Capacity - Smallest
4.06 cu yd
Largest Bucket Capacity
4.19 cu yd
Capacities
John Deere 644K Wheel Loader Capacities specifications
Heaped Capacity
4.2 cu yd
Hydraulic Tank
27.80 gal (105.22 l)
Transmission
6.10 gal (23.09 l)
Dimensions
John Deere 644K Wheel Loader Dimensions specifications
Ground Clearance
18.15 in (46.10 cm)
Height
11.25 ft (3.43 m)
Height Over Cab
11.26 ft (3.43 m)
Hinge Pin - Max Height
13.52 ft (4.12 m)
Length
26.58 ft (8.10 m)
Length With Bucket On Ground
27.24 ft (8.30 m)
Reach At Max Lift And Dump
5.29 ft (1.61 m)
Turning Circle
43.57 ft (13.28 m)
Weight
40,799.00 lbs (18,506.14 kg)
Wheelbase
10.70 ft (3.26 m)
Width
9.50 ft (2.90 m)
Width Over Tires
9.44 ft (2.88 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)
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
Operational
John Deere 644K Wheel Loader Operational 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)
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
×
Stay Ahead of the Market
Get weekly equipment news, auction updates, and dealer insights — trusted by thousands of industry professionals.
