Specifications, Service and Repair of Farm and Lawn Tractors

Massey Ferguson 6490 Tractor Specs Review

Massey Ferguson 6490 Tractor Engine

Engine Model - Agco Sisu Power 66 CTA
Engine Power, Rated, hp (kW) - 170 (127)
Engine Speed, rpm - 2200
Power Boost, hp (kW) - No boost
Fuel Tank, gal (L) - 93.8 (355)
Cylinders - 6
Displacement, cu in (L) - 403 (6.6)
Engine Bore, in (mm) - 4.25 (108)
Engine Stroke, in (mm) - 4.73 (120)
Block Design, Replaceable Liners - Replaceable wet liners
Aspiration, Turbocharged or Naturally Aspirated - Turbo air to air aftercooled
Fuel System Type - High Pressure Common Rail
Fuel System Control - Electronic
Fuel Injection to combustion chamber - Direct
Emission Level - Tier 3
Exhaust Gas Recirculation - Internal EGR
Exhaust Pipe - Vertical
Fan Drive Type - Belt
System Rating, Volts - 12
Alternator Rating, Amps - 120 Std / 150 Opt

MF 6490 Tractor Transmission

Description - Auto 6 Semi Powershift
Transmission Type - Synchronized Gear
Forward / Reverse Speeds - 24F / 24R
Maximum Speed Forward, mph (kph) - 24.9 (40)
Creeper Range - Yes
Shuttle (Forward-Reverse) - Yes

Massey Ferguson 6490 Tractor PTO

PTO Horsepower, hp (kW) - 140 (104.4)
PTO Speeds, rpm - 540 / 540E / 1000 / 1000E
PTO Type - Independent

Wheels

Drive Wheels - 2WD / 4WD
Steering - Front Steer

MF6490 Tractor Rear Axle

Final Drive - Planetary / Inboard
Axle Output End - Bar standard
Axle Bar Diameter, in (mm) - 3.74 (95)
Suspended Front Axle Available - Opt / Std w/50Kph Trans

Brakes

Brake Type - Wet Disc

Massey Ferguson 6490 Tractor Hydraulic System

Hydraulic System Type - Closed Center PFC
Main Hydraulic Pump Type - Gear Pump
Standard Pump Flow, gpm (Lpm) - 29 (110)
Optional Pump Flow, gpm (Lpm) - 39 (150)
Number of Standard Remote Valves - 3

3-Point Hitch Features

3-Point Hitch - Category 3
Optional Hitch - Category 3N
Draft Sensing or Lift Control - Lower Link
Draft Link Ends Adjustable - Yes

3-Point Hitch Lift Capacity

Standard Lift Capacity 24 Inches behind pin, lb (kg) - 16,500 (7480)

MF 6490 Tractor Drawbar

Drawbar Description - Swinging

Wheelbase

2WD, in (mm) - 118 (2996)
4WD, in (mm) - 118 (2996)

Tire Size

Front Tire Size, 2WD - 11.00 x 16
Front Tire Size Width, 4WD - 14.9R30
Rear Tire Size Width - 18.4R42

MF 6490 Tractor GPA40 rear PTO Clutch

Rear PTO clutch engagement and disengagement are controlled electrically by a proportional solenoid valve, which is itself controlled by the MF6490 Tractors electronic system.

The clutch, located at the front and in the upper section of the centre housing, controls the operation of the rear PTO.

It is connected in rotation to the engine flywheel via a vibration damper fixed to the flywheel and a line comprising two shafts.

It consists of a unit supported by two ball bearings centred in a support fitted to the centre housing. The sleeve supports the ball bearing, the drive hub and the piston.

The clutch housing comprises:

- at the front, a helical gear, fixed using screws, which transmits the movement to the hydraulic pumps. For Massey Ferguson 6490 Tractor equipped with GTA1540 transmission, gear P1 has spur cut teeth. It is also fixed using screws;

- at the rear, a bell housing with a set of discs and intermediate plate. A sealing ring minimises leakage between the rear end of the gearbox upper shaft and the clutch unit.

Clutch engaged position

The MF 6490 Tractor rear PTO clutch is supplied via the 17 bar (GTA1040 tractor transmission) or 21 bar (tractors equipped with GTA1540 transmission) low pressure hydraulic system and via a proportional solenoid valve fitted to the right-hand hydraulic cover plate.

A transfer pipe hydraulically links the right-hand hydraulic cover plate and the clutch support.

Pressurised oil enters the unit through hole and then flows to the rear of the piston via an internal channel. It pushes the piston, which compresses the discs and the intermediate plates.

The intermediate plates are attached to the bell housing by lugs. The discs are splined to the hub. The movement is then transmitted to the rear PTO driving gears via a shaft.

When the clutch is engaged, the PTO brake piston located in the rear housing is at rest and releases the lower PTO shaftline.

Clutch disengaged position

If the solenoid valve is no longer supplying the rear PTO clutch, the piston is returned against the unit by the spring.

The oil in the piston chamber is directed to the return by the solenoid valve. The valve ball leaves its seat, thus assisting the decompression of the chamber.

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