Diesel 16x4 4WD April 24 - May 11, 1992 Link: OCED Tractor Test 1657 file PTO performance Drawbar performance Gear 5-Low used for power test Gear 2H used for pull test
Max power
67.18hp / 50.1kW
Fuel use
4.7gal/hour / 17.8l/hour
Power at rated engine speed
76.75hp / 57.2kW
Power at rated PTO speed
75.63hp / 56.4kW
Max pull
10,512lbs / 4768kg
NEW HOLLAND 6640 POWER
Engine (gross)
90.7hp / 67.6kW
Engine (net)
85hp / 63.4kW
PTO (claimed)
76hp / 56.7kW
Drawbar (tested)
67.18hp / 50.1kW
PTO (tested)
77.13hp / 57.5kW
ENGINE DETAIL
Description
Ford Genesis diesel 4-cylinder 8-valve liquid-cooled
8-speed constant mesh 16-speed two-speed power shift 12-speed synchronized 16-speed four-speed power shift
TRANSMISSION 1
Transmission
EconoShift
Type
constant mesh
Gears
8 forward and 2 reverse
Clutch
dry disc
Oil capacity
69.6qts / 65.9L
Description
Four gears (1-4), plus reverse, in two ranges (L/H). Optional creeper provided a third range. Tractor must be stopped and clutch used to shift gears or range. The eight-speed transmission was only used on the 6640S
SPEEDS 1
Description
With 16.9-34 rear tires
TRANSMISSION 2
Transmission
Dual Power
Type
two-speed power shift
Gears
16 forward and 4 reverse
Clutch
dry disc
Oil capacity
69.6qts / 65.9L
Description
Dual Power adds a two-speed power shift between direct drive and the lower Dual Power range to the basic eight-speed transmission. The Dual Power range is engaged by a switch on the dashboard. Dual Power was an option on the 6640S
SPEEDS 2
Description
With 16.9-34 rear tires
TRANSMISSION 3
Transmission
SynchroShift
Type
synchronized
Gears
12 forward and reverse
Clutch
dry disc
Description
Four gears (1-4) in three ranges (L/M/H) with right-hand shuttle lever. Gear shifts are synchronized. Shifts between medium and high ranges are synchronized, but the tractor should be stopped to shift to or from low range. Synchronized shuttle shifting. The 12-speed SynchroShift was standard on the 6640 SL. Dual power was an option with the SynchroShift, turning it into a 24-speed transmission
SPEEDS 3
Description
With 16.9-38 rear tires
TRANSMISSION 4
Transmission
ElectroShift/Pulse Command
Type
four-speed power shift
Gears
16 forward and reverse
Clutch
wet disc
Oil capacity
64qts / 60.6L
Description
Four power shift gears arranged in two synchronized ratio groups (1-4 and 5-8). Two synchronized ranges (low/high) and right-hand shuttle. Clutch must be used to shift range or move between the lower (1-4) and higher (5-8) gear ratio groups. Push-button power shifting between the four gears in a ratio group. Push-button de-clutching on the shuttle lever allow shifting without the foot clutch. The 16 power shift was standard on the 6640 SLE
SPEEDS 4
Description
With 16.9-38 rear tires
MECHANICAL
Chassis
4x2 2WD/4x4 MFWD 4WD (optional)
Final drives
inboard planetary
Differential lock
mechanical (S)/electro-hydraulic (SL/SLE)
Steering
hydrostatic power
Brakes
mechanical (S)/hydraulic wet disc (SL/SLE)
Cab
Two-post foldable ROPS. Straddle-mount (6640 S) or raised deck (SL/SLE). Comfort Command Cab optional with air-conditioning (SL/SLE)
Transmissions
8-speed constant mesh 16-speed two-speed power shift 12-speed synchronized 16-speed four-speed power shift
HYDRAULICS
Type
open center (S/SL)/closed center load sensing (SLE)
Valves
1 to 4
Pump flow
18.2gpm / 68.9lpm 21gpm / 79.5lpm (SLE)
Steering press.
2100psi / 144.8bar
TRACTOR HITCH
Rear Type
II
Control
Position control and top-link draft sensing. Electronic lower-link sensing optional on 6640 SLE
The 6640 model tractor belongs to the New Holland PowerStar 40 Series. The 6640 is a Utility Tractors type, that is used often in Agriculture Tractors. The 6640 tractor features a engine. This arrangement is more practical in the actual world.