Two-post foldable ROPS with flat-deck platform. Comfort Command Cab optional with air-conditioning (SL/SLE).
Drive
4x2 2WD
Drive
4x4 MFWD 4WD (optional)
Final Drives
inboard planetary
Differential Lock
electro-hydraulic (SLE)
Brakes
mechanical (S)
Brakes
hydraulic wet disc (SL/SLE)
Hydraulics
Type
open center (S/SL)
Type
closed center load sensing (SLE)
Valves
1 to 4
Pump Flow
17.4 gpm65.9 lpm
Pump Flow
20 gpm (SLE)75.7 lpm
Steering Press
2100 psi144.8 bar
Hitch
Rear Type
II
Control
Position control and top-link draft sensing. Electronic lower-link sensing optional on 7840 SLE.
Rear Lift At24610mm
6,210 lbs (SL)2816 kg
Rear Lift At24610mm
8,240 lbs (SL optional)3737 kg
Rear Lift At24610mm
6,564 lbs (SLE)2977 kg
Rear Lift At24610mm
8,710 lbs (SLE optional)3950 kg
Pto
Rear Pto
independent
Rear Type
540/1000
Electrical
Ground
negative
Charging System
alternator
Charging Amps
55 (ROPS)
Charging Amps
100 (cab)
Batteries
1 (ROPS)
Batteries
2 (cab)
Battery Cca
800
Battery Volts
12
7840 / 02
Under the hood
Engine Detail
Ford Genesis
diesel
6-cylinder 12-valve
liquid-cooled
Displacement
401 ci6.6 L
Bore Stroke
4.40x4.40 inches112 x 112 mm
Compression Ratio
17.5:1
Rated Rpm
2100
Idle Rpm
725-2275
Firing Order
1-5-3-6-2-4
Starter Volts
12
Coolant Capacity
21.1 qts20.0 L
Coolant Capacity
22.7 qts (cab)21.5 L
Intake Valve Clearance
0.016 inches (cold)0.406 mm
Exhaust Valve Clearance
0.019 inches (cold)0.483 mm
Fuel Type
diesel
Cylinders
6
Cooling
liquid-cooled
Oil Capacity
22.1 qts20.9 L
Engine Options
Ford 6.6L 6-cyl diesel
Fuel Tank
57.5 gal217.6 L
7840 / 03
Gears & controls
Transmission (Option 1)
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 7840S.
Transmission
EconoShift
Transmission Type
constant mesh
Gears
8 forward and 2 reverse
Clutch
dry disc
Oil Capacity
69.6 qts65.9 L
Speeds Description
With 16.9-34 rear tires.
Transmission (Option 2)
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 7840S.
Transmission
Dual Power
Transmission Type
two-speed power shift
Gears
16 forward and 4 reverse
Clutch
dry disc
Oil Capacity
69.6 qts65.9 L
Speeds Description
With 16.9-34 rear tires.
Transmission (Option 3)
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. Sychronized shuttle shifting. The 12-speed SynchroShift was standard on the 7840 SL. Dual power was an option with the SynchroShift, turning it into a 24-speed transmission.
Transmission
SynchroShift
Transmission Type
synchronized
Gears
12 forward and reverse
Clutch
dry disc
Speeds Description
With 16.9-38 rear tires.
Transmission (Option 4)
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 7840 SLE.
