Upgrading 1660

Axial flow timeline

Hope this helps!


1986 Introduction of 1600 Series Axial-Flow Combines1620 124 H.P. 358 Cu.In. 125 Bu. Grain Tank1640 150 H.P. 466 Cu.In. 145 Bu. Grain Tank1660 180 H.P. 466 Cu.In. 180 Bu. Grain Tank1680 225 H.P. 466 Cu.In. 210 Bu. Grain TankCapacity 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 bootTapered entry design into clean grain elevator bootInclined 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 Header1.5″ knife system standard on 1020 Flx. Optional on 1010Cross auger lifts with reel lift for reversing

1987 Direction of rotation for rotary air screen reversedShaft speed monitor made standardFinal drive axle changed to one-piece forged shaft

1988 Model number decals were moved up to the front of the combine beside the grain tankRotor drive pulley improvedSlotted 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 Tank1640 160 H.P. 5.9 Liter 145 Bu. Grain Tank1660 190 H.P. 8.3 Liter 180 Bu. Grain Tank1680 235 H.P. 8.3 Liter 210 Bu. Grain TankIn-line core radiators replace staggered tupe design110 amp Bosh alternator replaced 90 amp Motorola with engine deflector shieldsBattery sizes upgradedCoolant level sensor addedEngine aspirator for Navistar engine combines

1990 Audible alarm added to grain-tank full indicatorRight side service access door added on 1640/1660Heavy-duty cleaning system drive parts: sieve hangers, hanger arms, pitmans, & shaftsCab heater valve replaced by valve from 7100 Magnum tractors1991 High visibility reel released for 1020 Flex and 1010 headersLong cleaning system released for 1680-grain combinesDual spin-on hydraulic filters on 1680Electric fuel transfer pump on 1680

1992 Introduction of Field Tracker92-120″ rear axle standardFuel line diameter increased to ½” and screen eliminated from tankHydraulic reservoir increased from 5 gallons to 8 gallonsNew lay-over header lift valveAccumulator standardAuxiliary and reel drive pumps combined into one dual pumpDual 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 connectorsRotor coupling bolts changed from grade 5 to grade 81620 combine discontinued

1993 Introduction of Second Generation 1600 Series Axial-Flow Combines1644 180 H.P. 5.9 Liter 145 Bu. Grain Tank1666 215 H.P. 8.3 Liter 180 Bu. Grain Tank1688 260 H.P. 8.3 Liter 210 Bu. Grain TankIntroduction of Cross-Flow Cleaning FanLong cleaning system (13.75″ added to chaffer and shoe sieve) 25.9% 44/66 and 23.7% on 88Larger air cleaners on 1666/1688Water-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 1644/1666Radial-seal type engine air filtersTransition cone & rotor cage seam bolts heads treated with tungsten-carbideUnloading auger spill saver added

1995 Introduction of 2100 Series Axial-Flow Combine2144 180 H.P. 5.9 Liter 145 Bu. Grain Tank2166 215 H.P. 8.3 Liter 180 Bu. Grain Tank2188 260 H.P. 8.3 Liter 210 Bu. Grain TankAll new cab and styling (23% more total glass area than 1600 series)Improved stadium-design lightingNew optional lighting package (after cut, side flood, rear work, and service lights)Theater style lay-out to right-hand consoleMult-function propulsion leverNew A-post instrumentation centerImproved operator ladderFocalized cab mounting systemNew pressure and flow-compensated (PFC) hydraulics and wet brakes New safety shielding, service platforms, hand rails, and guards Improved hinged service panels for easier access AFS field installed AFS systems released (March)

1996 Factory installed AFS systems released (March)

1997 New 13 bolt final drive mounting (previous 7 bolt mount)Poly skid shoes factory optionNew larger cab air filter on right side of cabFold-in rear windowSplined 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 boltRear axle center section tubing increased from 5/16″ to 3/8″Drive plate added to rotor drive couplerMain hydrostatic tubes replaced with hosesSeals added to front rotor coverDetents added to LH shieldsOne-piece cleaning fan hinge rodFloating hex shaft between front and rear unloading augersUnloading auger outer elbow housing rivets changed from ¼” to 5/16″

1998 Introduction of 2300 Series Axial-Flow Combines2344 174 H.P. 5.9 Liter 145 Bu. Grain Tank2366 240 H.P. 8.3 Liter 180 Bu. Grain Tank2388 280 H.P. 8.3 Liter 210 Bu. Grain TankTailings volume monitor standardDeluxe cab standardAuto temperature control standardEngine 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)68×50 – 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 cabNew rotor drive belt (27% increased contact area with pulleys) (21% increased service life)Torque sensing cam angle increased to 39 degreeCharge 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 DisplaysOptional extended wear packageGrooved torque sensing pulleys standardReverse rotation on left side auger in auger bedOptional edible bean packageLadder reworked with flexible bottom stepImproved sealing on feeder position potentiometersDraper headers released (limited production)Poly snouts standard on 1000 series narrow corn heads

2000 Elevator-mount moisture sensor on AFS combinesNew HVAC system with digital display (like MX Magnum)Air intake is not drawn from engine radiator air chute instead of rotary air screenGreasable hydrostatic drive hub2388 rear axle standard on 2344/66 combines2388 rotor cage constructed of AR235 wear-resistant steelCast shaker pivot support channelsPrecision-drilled holes in elevator slip clutch drive hubStalk roll bearing shield on 1000 series cornheads

2001 Hydraulic feeder reverser4-groove kevlar cord feeder drive belt3rd bearing on rocktrapRochelle rotor availableExternal straw chopper adjustment and taller “coined” bladesPredrilled for external sieve adjustersSieve viewing door and light12-row ready package for 2388 (4WD)122% larger toolbox180 gallon fuel tank replaces 123 gallon on 2388LH shields can be opened without lifting up side sheets16-weight bracket availableHillco leveling available from the factory2200 series cornheads introduced

2002 Steel pin replaces cotter pin in upper feeder shaft1-piece concavesExternal sieve adjusters available as factory optionPush-button chaff spreader couplerCurved chaff spreader bats factory option2-speed straw spreader pulleyGrain drain filler plates standard in grain tankClean grain auger inlet cone standard on 2388 – 15% more clean grain elevator capacity Belt-engage separator drive on 2388 replaces wet PTO clutch (with 5-rib separator drive belt)130 gallon fuel tank on 2344/6614.9-24 8PR R1 rear tires and heavy-duty rims standard on 2344/6612-row ready package available for 2WD combinesHinged right rear side panel with gas strutGrease banks for steering axle, unloading auger elbow, and front rotor bearingRotor gearbox speed adjusting lever moved to RH side of cabFeeder predrilled for Black Ace silencer kit New design auger fingers on 1020 grain heads (spring pin, broken fingers are collected in auger)Mechanical linkage AHHC replaces cable on 1020 grain heads

2003 2344 combine discontinuedNew AFX rotor on 2388: 5-25% more throughput Larger rotor drive pulleys, 900-lb. Rotor drive spring, longer seamless rotor beltWire cloth mesh hydraulic drive rotary air screen, relocated to RH side of combine,direct-flow design, with swing-open door Square wave technology on radiator and charge air cooler to prevent “deep-core” plugging2366 now air-to-air aftercooled, 250HP Muffler standard New Air cleaner design New operator’s seat with adjustable LH armrest and removable seat cushionsHeavy-duty 2WD rear axle with dual-steering cylinders optional on 2388

2004 208” extended-wear unloading auger made standard on 2388All 2388’s have extended wear auger bed augers, clean grain auger, grain tank bottom and vertical augers,HVOF diver’s helmet, and HVOF front rotor channelThe feeder on the 2388 is now 3rd cylinder readyCoined feeder slats standardComposite frame stainless steel wire mesh (0.024” hole size) rotary air screen standard, along with larger, external dirt chute, and one-piece bulb type door sealTorque sensing unit cam angle changed to 54 degrees on 2388Stainless steel vanes in rotor cage standard on 2388

2005 Production moved from East Moline, IL to Grand Island, NE2366 replaced by 2377

2006 Tier lll electronic 8.3L engines: 285 HP rated/325 HP maximum on 2388, 255 HP rated/290 HP maximum on 2377Enhanced engine monitoring with automatic shutdown20% larger radiatorHeavy-duty 3-speed rotor gearbox and inverted rotor beltCurved spreader bats standardUnloading auger tube reinforcedRotating beacons optionalSight glass for hydraulic reservoirFull-fingered auger optional from the factory on 1020 grain head

If you want a significant increase in capacity I wouldn't recommend the 2166. That's basically a 1660 with a more modern cab.

The 21/2388 has a larger rotor, longer and wider sieves and a larger, more powerful engine. The 21 is 260hp, 210 bu grain tank, the 23 is 280hp, 210 bushel tank and a 3 speed, instead of a 2 speed, rotor gearbox. Both the 2188 and 2388 have more electronics in the cab and more in cab adjustments than your 1660.

Under the sheet metal the 21 and 23 combines are essentially the same as the earlier 14 and 16 machines (and, for that matter, the current production 50/60/7088; an Axial Flow is pretty much an Axial Flow).

All of the 66 and 88 series combines provide easier access to the electrical and hydraulic components than the earlier models and the cabs are larger and quieter. The hydraulic systems are much better, also. Control placement is different but not so much that it takes long to get used to. If you want more capacity, though, you should look for an 88 series.

Mark