The AGCO Allis 6690 tractor is powered by a SLH 4.0L 4-cyl diesel engine that provides 86.91 hp/64.8 kW of horsepower and torque. It has a 4x2 2WD/4x4 MFWD 4WD (optional) drive configuration and a 12-speed synchromesh/24-speed/16-speed/30-speed partial power shift transmission.

Engine

The engine is a SLH 1000.4-AT/turbocharged diesel/4-cylinder/air-cooled with a displacement of 244 ci/4.0 L and bore/stroke of 4.13x4.55 inches/105 x 116 mm. It has a power output of 86.91 hp/64.8 kW and a dry element air cleaner. The engine is equipped with thermostart pre-heating and has a rated RPM of 2500. The starter volts are 12 and the oil capacity is 9.2 qts/8.7 L.


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Transmission

The transmission is a 12-speed synchromesh/24-speed/16-speed/30-speed partial power shift. It has an engine power output of 86.91 hp/64.8 kW and a PTO (claimed) power output of 80.88 hp/60.3 kW. The drawbar (tested) power output is 68.53 hp/51.1 kW and the PTO (tested) power output is 80.85 hp/60.3 kW. The transmission is reliable and provides smooth gear changes. It is easy to operate and maintain. The transmission is suitable for a wide range of applications.

Brakes

The brakes are hydraulic wet disc. The SLH 1000.4-AT/turbocharged diesel/4-cylinder/air-cooled engine provides a power output of 86.91 hp/64.8 kW. The brakes are reliable and provide excellent stopping power. The air-cooled engine ensures that the brakes do not overheat during prolonged use. The brakes are easy to maintain and provide consistent performance. The oil capacity of the engine is 9.2 qts/8.7 L.



Steering

The steering is hydrostatic power. The SLH 4.0L 4-cylinder diesel engine provides a power output of 86.91 hp/64.8 kW. The steering is responsive and provides excellent control. It is easy to operate and maintain. The steering is suitable for a wide range of applications.


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Common Problems

Users have reported issues with the cab air-conditioning system. Some users have also reported issues with the transmission, particularly with the synchromesh gears. The hydraulic system has also been known to develop leaks. The brakes may require frequent adjustment to maintain optimal performance. The engine may require regular maintenance to prevent overheating.

What Users Like

Users appreciate the versatility of the AGCO Allis 6690, which is suitable for a wide range of applications. The transmission is reliable and provides smooth gear changes. The steering is responsive and provides excellent control. The brakes are reliable and provide excellent stopping power. Users also appreciate the comfortable cab with four-post ROPS and optional air-conditioning.

AGCO Allis 6690 Technical Specifications

Power

Engine86.91 hp/64.8 kW
Pto (claimed)80.88 hp/60.3 kW
Drawbar (tested)68.53 hp/51.1 kW
Pto (tested)80.85 hp/60.3 kW

Engine Detail

DescriptionSLH 1000.4-AT/turbocharged diesel/4-cylinder/air-cooled
Displacement244 ci/4.0 L
Bore/stroke4.13x4.55 inches/105 x 116 mm
Power86.91 hp/64.8 kW
Air Cleanerdry element
Pre-heatingthermostart
Rated Rpm2500
Idle Rpm650-2710
Starter Volts12
Oil Capacity9.2 qts/8.7 L

Engine

DescriptionSLH 4.0L 4-cyl diesel

Mechanical

Chassis4x2 2WD/4x4 MFWD 4WD (optional)
Steeringhydrostatic power
Brakeshydrualic wet disc
CabFlat-deck with four-post ROPS. Cab optional with air-conditioning.
Transmissions12-speed synchromesh/24-speed/16-speed/30-speed partial power shift

Tires

Standard Tires (ag)Front: 7.50-18. Rear: 16.9R34 (2WD)/Front: 14.9R24. Rear: 16.9R34 (4WD)

Dimensions

2wd Wheelbase96.4 inches/244 cm
4wd Wheelbase92.8 inches/235 cm
Length161 inches/408 cm
Width82.4 inches/209 cm
Height111.2 inches/282 cm
Ground Clearance17.6 inches/44 cm
Rear AxleFlange

Dimensions And Tires

2wd Wheelbase96.4 inches/244 cm
4wd Wheelbase92.8 inches/235 cm
Weight6724 to 7385 pounds
Front Tire7.50-18
Rear Tire16.9R34 (2WD)

Serial Numbers

LocationConsole, right side
19911001
19921427
19931506
19941669
19951888
19962010

Capacity

Fuel28.27 gal/107.0 L
Hydraulic System15.2 gal/57.5 L

Hydraulics

Typeopen center
Capacity15.2 gal/57.5 L
Valves2
Pump Flow11.23 gpm/42.5 lpm

Tractor Hitch

Rear TypeII/I
Controlposition and draft control with lower-link sensing
Rear Lift (at Ends)6,790 lbs/3079 kg

Electrical

Groundnegative
Charging Systemalternator
Charging Amps55
Battery Volts12
Battery Ah100

Speeds

DescriptionWith 16.9R34 rear tires.

Power Take Off Pto

Rear Ptoindependent
Clutch124.5mm hydraulic wet disc
Rear Rpm540/1000 (1.375)
Engine Rpm540@2200/1000@2450

Weight

2wd Shipping6,724 lbs/3050 kg
4wd Shipping7,385 lbs/3349 kg
2wd Max Capacity11,464 lbs/5200 kg
4wd Max Capacity12,015 lbs/5450 kg

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