1977     Introduction of first 300 Axial-Flow Combines
                    1440 135 H.P. 436 CuIn. 145 Bu. Grain Tank
                    1460 170 H.P. 436 Cu.In. 180 Bu. Grain Tank

1978     Introduction of 1480 Axial-Flow Combine
                    1480 190 H.P. 436 Cu. In. 208 Bu. Grain Tank
            820 flex head introduced - 13' to 22.5'

1979     Engine updated to "B" series
            Water separator filter changed from cannister filter to spin-on filter
            One-piece hydro pump drive pulley changed to two-piece pulley with replaceable hub

1980     Keystock grates introduced
            Electric fan speed adjustment
            27/28 gears now used on 1440 grain & corn combines
            Oscillating guide axle shield standard on rice & corn machines
            Friction disc slip clutch replaces ratchet clutch
            New rotor with new cone rear bulkhead

1981     Introduction of 1420 Axial-Flow Combine
                    1420 112 H.P. 358 Cu.In. 125 Bu. Grain Tank
            Introduction of Electro-hydraulics
            1480 engine and H.P. change
                    1480 210 H.P. 466 Cu.In. 208 Bu. Grain Tank
            PTO clutch changed from 7 plates to 9 plates (1480)
            Straw chopper both factory and field codes (April 1981)
            Two Speed Hydrostatic Drive Motor 1480
            Power guide wheel drives for all models as factory installed option (January 1981)
            Grain Loss Monitor as field attachment only
            Introduction of 900 Series Corn Heads

1982     1420 H.P. change
                    1420 124 H.P. 358 Cu.In. 125 Bu. Grain Tank
            Electric fan speed adjustment offered on 1420
            Power-guide rear axle availabe on 1420
            Brake disc diameter changed from 7" to 8" on 1460/1480
            Additional brake disc (2 disc to 3 disc) on 1420/1440
            Hydraulic control valve improvements
            Automatic feeder cutoff available
            Auto reel-to-ground speed attachment available
            Fishburn lock added to 1460/1480 transmission
            Clean grain auger shaft increased to 1-1/4" on 1440/1460/1480
            Rocktrap introduced on 1440/1460/1480

1983     New elevator jackshaft on 1440/1460/1480
            Cessna header lift pump replaced Webster
            4-blade discharge beater changed to 3-blade beater           
            Final drive shafts changed from 3-bolt to 1-bolt design on 1480
            Inline pressure filter between hydraulic pump and header valve
            Bosch injection pump replaced rotary type on 1480

1984     Introduction of Specialty Rotor
            Danfoss steering hand pumps replace TRW pumps
            Cone changed from low carbon steel to medium carbon steel (1040)
            Grain gears now standard on all corn combines
            2-speed hydro available on 1460
            Improved steering axle: new rims, spindles, and hubs
            Rear-wheel assist revised

1985     Mufflers eliminated on 1460/1480
            One-piece forged final drive axle assembly
            Feeder bottom, door, and hinge changed to 1040 steel
            Rocktrap beater changed from 4-blade design to 3-blade, keystock welded on LH end, and beater blades thicker
            Rotor kickers standard
            3^rd lift cylinder available on 1440

1986     Introduction of 1600 Series Axial-Flow Combines
                    1620 124 H.P. 358 Cu.In. 125 Bu. Grain Tank
                    1640 150 H.P. 466 Cu.In. 145 Bu. Grain Tank
                    1660 180 H.P. 466 Cu.In. 180 Bu. Grain Tank
                    1680 225 H.P. 466 Cu.In. 210 Bu. Grain Tank
            Capacity increases of 70% on 1640 and 1660 and 25% on 1680
            Increased concave area by 15.5% on 1640 and 1660 and 16% on 1680
            Increased separating area by 24% on 1620, 32% on 1640 and 1660, and 41% on 1680
            Cage vanes adjustable without removing bolts or concaves and grates
            Clean grain augers increased in diameter (7" on 1640 and 1660 and 8" on 1680)
            Deeper clean grain elevator cross section (11.1 x 6" on 1640 and 1660 and 11.1 x 8" on 1680)
            Tear drop clean grain elevator lower boot
            Tapered entry design into clean grain elevator boot
            Inclined delivery auger standard on all 1680’s and 1660 rice models
            Shaft speed monitor standard (monitors 9 areas, two more, feeder and spreader)
            Improved lighting package (6-60 watt halogen lights including one long distance light)
            Optional feeder reverser all 1600 (field kits for certain 1400 series)
            Introduction of 1020 Flexible Cutterbar Header
            1.5" knife system standard on 1020 Flx. Optional on 1010
            Cross auger lifts with reel lift for reversing

1987     Direction of rotation for rotary air screen reversed
            Shaft speed monitor made standard
            Final drive axle changed to one-piece forged shaft

1988     Model number decals were moved up to the front of the combine beside the grain tank
            Rotor drive pulley improved
            Slotted bolt holes in concave hanger brackets on RH side

1989     Introduction of New CDC Engines (4/1/89)
                    1620 145 H.P. 5.9 Liter 125 Bu. Grain Tank
                    1640 160 H.P. 5.9 Liter 145 Bu. Grain Tank
                    1660 190 H.P. 8.3 Liter 180 Bu. Grain Tank
                    1680 235 H.P. 8.3 Liter 210 Bu. Grain Tank
            In-line core radiators replace staggered tupe design
            110 amp Bosh alternator replaced 90 amp Motorola with engine deflector shields
            Battery sizes upgraded
            Coolant level sensor added
            Engine aspirator for Navistar engine combines

1990     Audible alarm added to grain-tank full indicator
            Right side service access door added on 1640/1660
            Heavy-duty cleaning system drive parts: sieve hangers, hanger arms, pitmans, & shafts
            Cab heater valve replaced by valve from 7100 Magnum tractors
            1991 High visibility reel released for 1020 Flex and 1010 headers
            Long cleaning system released for 1680-grain combines
            Dual spin-on hydraulic filters on 1680
            Electric fuel transfer pump on 1680
 

1992     Introduction of Field Tracker
            92-120" rear axle standard
            Fuel line diameter increased to ½" and screen eliminated from tank
            Hydraulic reservoir increased from 5 gallons to 8 gallons
            New lay-over header lift valve
            Accumulator standard
            Auxiliary and reel drive pumps combined into one dual pump
            Dual spin-on hydraulic filters on 1640/1660 (same as 1680)
            2-piece hydrostatic steel lines replaced by a center steel tube with outer rubber hoses with 4-bolt split flange connectors
            Rotor coupling bolts changed from grade 5 to grade 8
            1620 combine discontinued

1993     Introduction of Second Generation 1600 Series Axial-Flow Combines
                    1644 180 H.P. 5.9 Liter 145 Bu. Grain Tank
                    1666 215 H.P. 8.3 Liter 180 Bu. Grain Tank
                    1688 260 H.P. 8.3 Liter 210 Bu. Grain Tank
            Introduction of Cross-Flow Cleaning Fan
            Long cleaning system (13.75" added to chaffer and shoe sieve) 25.9% 44/66 and 23.7% on 88
            Larger air cleaners on 1666/1688
            Water-pump sealed stalk roll bearings on 1000 series cornheads

1994     Introduction of Straw/Chaff spreader system (factory and field codes for long sieve units)
            1644 gets 1666/1688 transmision, final drive, and brakes
            Optional cold-start package (ether assist and block heater)
            Electric fuel pump added on 1644/1666
            Radial-seal type engine air filters
            Transition cone & rotor cage seam bolts heads treated with tungsten-carbide
            Unloading auger spill saver added

1996     Factory installed AFS systems released (March)

1997     New 13 bolt final drive mounting (previous 7 bolt mount)
            Poly skid shoes factory option
            New larger cab air filter on right side of cab
            Fold-in rear window
            Splined feeder jackshaft replaces keyed shaft   
            Transmission charged from a 3-bolt to a 5-bolt retention pattern on the differential bearing carrier.
            Locking collar on final drive shaft couplers replaces bolt
            Rear axle center section tubing increased from 5/16" to 3/8"
            Drive plate added to rotor drive coupler
            Main hydrostatic tubes replaced with hoses
            Seals added to front rotor cover
            Detents added to LH shields
            One-piece cleaning fan hinge rod
            Floating hex shaft between front and rear unloading augers
            Unloading auger outer elbow housing rivets changed from ¼" to 5/16"

1998     Introduction of 2300 Series Axial-Flow Combines
                    2344 174 H.P. 5.9 Liter 145 Bu. Grain Tank
                    2366 240 H.P. 8.3 Liter 180 Bu. Grain Tank
                    2388 280 H.P. 8.3 Liter 210 Bu. Grain Tank
            Tailings volume monitor standard
            Deluxe cab standard
            Auto temperature control standard
            Engine air filter restriction indicator added to A-post display
            Engine air intake manifold temperature indicator and feeder shut-off (2388)
            Hydraulically driven rotary air screen (2388) (27% larger area)
            68x50 - 32h high flotation tire option (1730 Sq. In. contact area) (38% less ground P.S.I.)
            600/65-R28 high flotation tire option (710 Sq. In. contact area) (19% less ground P.S.I.)
            Rotor skin increased thickness and strength (3 times more resistant to denting)
            Three speed rotor gearbox (2388) w/ adjuster lever on left side of cab
            New rotor drive belt (27% increased contact area with pulleys) (21% increased service life)
            Torque sensing cam angle increased to 39 degree
            Charge air cooling with air-to-air aftercooling (2388)
            New engine air filter design (38% Larger filter area) (Lower profile)
            Radiator spinner blade standard

1999     Introduction of AFS Universal Displays
            Optional extended wear package
            Grooved torque sensing pulleys standard
            Reverse rotation on left side auger in auger bed
            Optional edible bean package
            Ladder reworked with flexible bottom step
            Improved sealing on feeder position potentiometers
            Draper headers released (limited production)
            Poly snouts standard on 1000 series narrow corn heads

2000     Elevator-mount moisture sensor on AFS combines
            New HVAC system with digital display (like MX Magnum)
            Air intake is not drawn from engine radiator air chute instead of rotary air screen
            Greasable hydrostatic drive hub
            2388 rear axle standard on 2344/66 combines
            2388 rotor cage constructed of AR235 wear-resistant steel
            Cast shaker pivot support channels
            Precision-drilled holes in elevator slip clutch drive hub
            Stalk roll bearing shield on 1000 series cornheads

2001     Hydraulic feeder reverser
            4-groove kevlar cord feeder drive belt
            3^rd bearing on rocktrap
            Rochelle rotor available
            External straw chopper adjustment and taller "coined" blades
            Predrilled for external sieve adjusters
            Sieve viewing door and light
            12-row ready package for 2388 (4WD)
            122% larger toolbox
            180 gallon fuel tank replaces 123 gallon on 2388
            LH shields can be opened without lifting up side sheets
            16-weight bracket available
            Hillco leveling available from the factory
            2200 series cornheads introduced