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Case 646 Compact Tractor

Case 646 Engine

Engine Model .................. Onan CCKA
Engine Type .................. 4-Stroke, Two-cylinder air-cooled horizontal-shaft gasoline
Number of Cylinders .................. 2
Displacement, cu in (L) .................. 49.8 (0.817)
Engine Bore, in (mm) .................. 3.25 (82.5)
Engine Stroke, in (mm) .................. 3.00 (76.2)
Rated Engine Power, hp (kW) .................. 16.5 (12.3)
Rated Engine Speed, rpm .................. 3600
Idle Speed, rpm.................. 1200
Compression Ratio .................. 7.0:1
Fuel System .................. Carburetor
Carburetor Type .................. Fixed main jet
Fuel Pump Type .................. Vacuum diaphragm
Cooling System .................. Air-cooled
Intake Valve Clearance, in (mm) .................. 0.007 (0.18)
Exhaust Valve Clearance, in (mm) .................. 0.016 (0.41)
Ignition Timing, deg .................. 20 BTC
Spark Plug .................. Champion RH8
Spark Plug Gap, in (mm) .................. 0.025 (0.64)
Point Gap, in (mm) .................. 0.020 (0.51)
Fuel Tank Capacity, gal (L) .................. 5.0 (19.0)
Oil Capacity, qts (L) .................. 4.0 (3.8)
Electrical System Rating, Volts .................. 12
Charging System .................. 20A, Flywheel alternator

Case 646 Transmission

Transmission Model .................. Hy-Drive
Transmission Type .................. Hydraulic drive
Number of Forward Gears .................. Infinite, 2-ranges (Hi-Lo)
Number of Reverse Gears .................. Infinite, 2-ranges (Hi-Lo)
Oil Capacity (Transaxle), qts (L) .................. 3.0 (2.8)
Forward Speed (Low Range), mph (kph) .................. 2.5 (4.0)
Forward Speed (High Range), mph (kph) .................. 6.5 (10.5)
Reverse Speed (Low Range), mph (kph) .................. 2.5 (4.0)
Reverse Speed (High Range), mph (kph) .................. 6.5 (10.5)

Wheels and Tires

Drive Wheels .................. 2WD 4x2
Steering Configuration .................. Front steer
Steering System .................. Manual
Brakes Type .................. Mechanical compression band
Front Tire Size .................. 5.70-8
Rear Tire Size .................. 27x8.50-15

Case 646 Hydraulic System

Hydraulic System Type .................. Open Center
Hydraulic Pump Type .................. Gear
Implement Pump Flow, gpm (Lpm) .................. 9.0 (34.0)
Implement Lift Relief Valve Setting, Bar (psi) .................. 83 (1200)
Hydraulic Pressure, Bar (psi) .................. 159 (2300)
Hydraulic Fluid Capacity, gal (L) .................. 3.0 (11.4)

Dimensions and Weight

Wheelbase, in (mm) .................. 48 (1210)
Length with Loader, in (mm) .................. 108 (2740)
Height (Steering Wheel), in (mm) .................. 43.3 (1090)
Overall Width, in (mm) .................. 41 (1040)
Ground Clearance, in (mm) .................. 8.3 (200)
Weight, lb (kg) .................. 1190 (540)

Case 646 Loader Specifications

Maximum Lift Height (To Pin), in (mm) .................. 71.8 (1820)
Maximum Lift Height (Fully Rased), in (mm) .................. 92 (2340)
Clearance, Dumped Bucket, in (mm) .................. 52.9 (1340)
Reach At Max. Height and Max. Dump Angle, in (mm) .................. 13.8 (350)
Reach At 45 deg. Dump Angle, in (mm) .................. 16.9 (430)
Maximum Dump Angle, deg .................. 54
Rollback Angle, deg .................. 18
Digging Depth, in (mm) .................. 2 (51)
Lift Capacity to Full Height, lb (kg) .................. 600 (275)
Bucket Width, in (mm) .................. 44 (1115)