John Deere 644K Wheel Loader Specs
 
Engine
Type John Deere PowerTech 6068H
complies with EPA Tier 3 regulations
Cylinders 6
Valves per Cylinder 4
Displacement 414 cu. in. (6.8 L)
Net Peak Power (ISO9249) 232 hp (173 kW) @ 1,700 rpm
Net Peak Torque (ISO9249) 749 lb. ft. (1016 Nm) @ 1,400 rpm
Aspiration turbocharged and charge air cooled
Air Cleaner dual element dry type; restriction indicator in cab
Fan Drive hydraulically driven, proportionally controlled, fan aft of coolers
Electrical System 24 volt with 80-amp alternator
Batteries (two 12 volt) 950 CCA

 

Transmission
Travel Speeds
        Gear 1
        Gear 2
        Gear 3
        Gear 4		 Forward
4.7 mph (7.6 km/h)
7.8 mph (12.6 km/h)
15.3 mph (24.7 km/h)
22.7 mph (36.6 km/h)		 Reverse
4.9 mph (7.9 km/h)
8.0 mph (12.9 km/h)
15.5 mph (24.9 km/h)
 

 

Refill Capacities
Fuel Tank (with ground level fueling) 93 gal. (352 L)
Cooling System 31 qt. (29.5 L)
Engine Oil, Including Filter 26 qt. (24.5 L)
Transmission, Including Filter 24 qt. (23 L)
Differential ( each axle) 23 qt. (22 L)
Hydraulic Reservoir and Filters 29 gal. (110 L)
Wet-Disc Parking Brake 20 oz. (0.6 L)

 
Dimensions (with Pin On Bucket) Standard Z-Bar High-Lift Z Bar
A) Height to Top of Cab 11 ft. 1 in. (3.38 m) 11 ft. 1 in. (3.38 m)
B) Height to Top of Exhaust 11 ft. 0 in. (3.35 m) 11 ft. 0 in. (3.35 m)
C) Ground Clearance 16.1 in. (408 mm) 16.1 in. (408 mm)
D) Length from Centerline to Front Axle 5 ft. 3 in. (1.60 m) 5 ft. 3 in. (1.60 m)
E) Wheelbase 10 ft. 8 in. (3.26 m) 10 ft. 8 in. (3.26 m)
F) Dump Clearance see below see below
G) Height to Hinge Pin, Fully Raised 13 ft. 4 in. (4.07 m) 14 ft. 9 in. (4.49 m)
H) Dump Reach see below see below
I) Maximum Digging Depth 6.2 in. (159 mm) 10.0 in. (253 mm)
J) Overall Length see below see below
K) Maximum Rollback at Ground Level 42 degrees 42 degrees

 

Dimensions (with Quick-Coupler and Bucket)
  Standard Z Bar High Lift
A) Dump Clearance see below see below
B) Dump Reach see below see below
C) Maximum Digging Depth 7.5 in. (192 mm) 11.0 in. (279 mm)
D) Height to Hinge Pin, Fully Raised 13 ft. 4 in. (4.07 m) 14 ft. 9 in. (4.49 m)
E) Overall Length see below see below
F) Maximum Rollback, Boom Fully Raised 55 degrees 47 degrees
G) Maximum Bucket Discharge Angle, Fully Raised 45 degrees 45 degrees
H) Maximum Rollback at Ground Level 40.5 degrees 42 degrees

 

 

Dimensions (with Quick-Coupler and Construction Fork)
  Standard Z Bar High Lift
A) Reach, Fully Raised 33 in. (842 mm) 37.7 in. (958 mm)
B) Fork Height, Fully Raised 12 ft. 3 in. (3.74 m) 13 ft. 8 in. (4.16 m)
C) Maximum Reach, Fork Level 5 ft. 8 in. (1.73 m) 7 ft. 0 in. (2.13 m)
D) Fork Height, Maximum Reach 5 ft. 5 in. (1.66 m) 5 ft. 11 in. (1.80 m)
E) Reach, Ground Level 4 ft. 1 in. (1.26 m) 5 ft. 8 in. (1.72 m)
F) Depth Below Ground 6 in. (142 mm) 9 in. (234 mm)
G) Tine Length see below see below
H) Overall Length see below see below

 

Standard Z-Bar Information with Pin On Bucket
Bucket Type/Size General Purpose w/ Bolt on Edge
Capacity, Heaped SAE 4.25 cu. yd. (3.2 m3)
Capacity, Struck SAE 3.7 cu. yd. (2.8 m3)
Bucket Weight 3,826 lb (1735 kg)
Bucket Width 10 ft. 0 in. (3.04 m)
Breakout Force, SAE J732C 33,903 lb (15 378 kg)
Tipping Load, Straight 33, 576 lb (15 230 kg)
Tipping Load, 40-Degree Full Turn, SAE 28,937 lb (13 126 kg)
Reach, 45-Degree Dump, 7 ft (2.13 m) Clearance 5 ft. 6 in. (1.67 m)
Reach, 45-Degree Discharge, Full Height 3 ft. 8 in. (1.12 m)
Dump Clearance, 45-Degree  Full Height 9 ft. 4 in. (2.86 m)
Overall Length, Bucket on Ground 26 ft. 5 in. (8.14 m)
Loader Clearance Circle, Bucket in Carry Position 43 ft. 3.5 in. (13.20 m)
Operating Weight 40,036 lb (18 160 kg)

 

Standard Z-Bar Information with Quick Coupler and Bucket
Bucket Type/Size General Purpose w/ Bolt on Edge
Capacity, Heaped SAE 4.0 cu. yd. (3.1 m3)
Capacity, Struck SAE 3.6 cu. yd. (2.7 m3)
Bucket Weight 4,682 lb (2124 kg)
Bucket Width 9 ft. 10 in. (3.00 m)
Breakout Force, SAE J732C 30,124 lb (13 664 kg)
Tipping Load, Straight 30,361 lb (13 772 kg)
Tipping Load, 40-Degree Full Turn, SAE 26,043 lb (11 813 kg)
Reach, 45-Degree Dump, 7 ft (2.13 m) Clearance 5 ft. 11 in. (1.81 m)
Reach, 45-Degree Discharge, Full Height 4 ft. 3 in. (1.29 m)
Dump Clearance, 45-Degree  Full Height 9 ft. 2 in. (2.79 m)
Overall Length, Bucket on Ground 27 ft. 3 in. (8.31 m)
Loader Clearance Circle, Bucket in Carry Position 43 ft. 7 in. (13.29 m)
Operating Weight 40,889 lb (18 547 kg)

 

Standard Z-Bar with Quick Coupler and Construction Fork
Tine Length 60 in. (1.52 m) 72 in. (1.83 m)
Overall Length 29 ft. 0 in. 30 ft. 0 in.
Tipping Load, Straight (fork level, load centered and positioned at 50% tine length) 22,520 lb (10 215 kg) 21,363 lb (9690 kg)
Tipping Load, 40 deg. Full Turn (fork level, load centered and positioned at 50% tine length) 19,429 lb (8813 kg) 18,411 lb (8351 kg)
Operating Weight 39,937 lb (18 115 kg) 40,069 lb (18 175 kg)
 
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