John Deere 644J Wheel Loader Specs
 
Engine
Type John Deere PowerTech 6068H
complies with EPA Tier 2 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) 1,400 CCA

 

Transmission
Travel Speeds
        Gear 1
        Gear 2
        Gear 3
        Gear 4		 Forward
4.6 mph (7.4 km/h)
7.6 mph (12.2 km/h)
14.7 mph (23.7 km/h)
22.0 mph (35.4 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 28 qt. (26.5 L)
Transmission, Including Filter 28 qt. (22 L)
Differential ( each axle) 23 qt. (22 L)
Hydraulic Reservoir and Filters 31 gal. (117.3 L)
Wet-Disc Parking Brake 20 oz. (0.6 L)

 

Hydraulic System / Steering 4.25 cu. yd. (3.2 m3) bucket with bolt on cutting edge
Maximum Lift Capacity  
     Lift at Ground Level
     Lift at Maximum Height		 34,166 lb (15 497 kg)
20,226 lb (9174 kg)

 
Dimensions (with Pin On Bucket) Standard Z-Bar High-Lift Z Bar
A) Height to Top of Cab 11 ft. 2 in. (3.40 m) 11 ft. 2 in. (3.40 m)
B) Height to Top of Exhaust 11 ft. 0 in. (3.35 m) 11 ft. 0 in. (3.35 m)
C) Ground Clearance 18.1 in. (460 mm) 18.1 in. (460 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. 6 in. (3.20 m) 10 ft. 6 in. (3.20 m)
F) Dump Clearance see below see below
G) Height to Hinge Pin, Fully Raised 13 ft. 7 in. (41.4 m) 15 ft. 0 in. (4.57 m)
H) Dump Reach see below see below
I) Maximum Digging Depth 2.7 in. (69 mm) 6.4 in. (162.6 mm)
J) Overall Length see below see below
K) Maximum Rollback at Ground Level 40 degrees 40 degrees

 
Dimensions (with Quick-Coupler and Bucket)
  Standard Z Bar
A) Dump Clearance see below
B) Dump Reach see below
C) Maximum Digging Depth 2.5 in. (64 mm)
D) Height to Hinge Pin, Fully Raised 13 ft. 7 in. (4.14 m)
E) Overall Length see below
F) Maximum Rollback, Boom Fully Raised 55 degrees
G) Maximum Bucket Discharge Angle, Fully Raised 45 degrees
H) Maximum Rollback at Ground Level 39 degrees

 

 

Dimensions (with Quick-Coupler and Construction Fork)
  Standard Z Bar
A) Reach, Fully Raised 25 in. (635 mm)
B) Fork Height, Fully Raised 12 ft. 11 in. (3.94 m)
C) Maximum Reach, Fork Level 5 ft. 1 in. (1.55 m)
D) Fork Height, Maximum Reach 6 ft. 1 in (1.85 m)
E) Reach, Ground Level 3 ft. 0 in. (0.91 m)
F) Depth Below Ground 2 in. (51 mm)
G) Tine Length see below
H) Overall Length 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 3,746 lb (1699 kg)
Bucket Width 9 ft. 6 in. (2.90 m)
Breakout Force, SAE J732C 34,407 lb (15 607 kg)
Tipping Load, Straight 34,379 lb (15 594 kg)
Tipping Load, 40-Degree Full Turn, SAE 30,520 lb (13 844 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. 6 in. (1.07 m)
Dump Clearance, 45-Degree  Full Height 9 ft. 8 in. (2.94 m)
Overall Length, Bucket on Ground 26 ft. 5 in. (8.05 m)
Loader Clearance Circle, Bucket in Carry Position 42 ft. 3 in. (12.88 m)
Operating Weight 40,150 lb (18 214 kg)

 

Standard Z-Bar Information with Quick Coupler and Bucket
Bucket Type/Size General Purpose w/ Bolt on Edge
Capacity, Heaped SAE 4.25 cu. yd. (3.2 m3)
Capacity, Struck SAE 3.8 cu. yd. (2.9 m3)
Bucket Weight 4,900 lb (2223 kg)
Bucket Width 9 ft. 6 in. (2.90 m)
Breakout Force, SAE J732C 28,976 lb (13 143 kg)
Tipping Load, Straight 30,137 lb (13 670 kg)
Tipping Load, 40-Degree Full Turn, SAE 26,625 lb (12 077 kg)
Reach, 45-Degree Dump, 7 ft (2.13 m) Clearance 5 ft. 3 in. (1.60 m)
Reach, 45-Degree Discharge, Full Height 3 ft. 8 in. (1.13 m)
Dump Clearance, 45-Degree  Full Height 8 ft. 11 in. (2.71 m)
Overall Length, Bucket on Ground 27 ft. 1 in. (8.26 m)
Loader Clearance Circle, Bucket in Carry Position 42 ft. 9 in. (13.03 m)
Operating Weight 41,310 lb (18 738 kg)

 

Standard Z-Bar with Quick Coupler and Construction Fork
Tine Length 60 in. (1.52 m) 72 in. (1.83 m)
Overall Length 28 ft. 4 in. (8.64 m) 29 ft. 4 in. (8.94 m)
Tipping Load, Straight (fork level, load centered 36 in. (914 mm) on tine) 24,276 lb (11 012 kg) 24,098 lb (10 931 kg)
Tipping Load, 40 deg. Full Turn (fork level, load centered 36 in (914 mm) on tine) 21,545 lb (9772 kg) 21,365 lb (9691 kg)
Operating Weight 40,161 lb (18 217 kg) 40,212 lb (18 240 kg)
 
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