Ford 6610 Mark III Tractor Specifications (1988–1991)
The Ford 6610 Mark III, produced from 1988 to 1991, represents the final evolution of Ford’s legendary 10 Series mid-range tractors.
The Mark III update introduced improved hydraulics, increased power, upgraded charging systems, and refined operator features.
With a strong 4.4L Ford diesel engine, high-flow hydraulic pump, and 16-speed transmission, the 6610 Mark III is widely regarded as one of Ford’s most capable and durable utility tractors.
This model was produced in both 2WD and 4WD, and offered with ROPS or a factory cab—each with different fuel capacities and electrical output.
1. Overview
| Item | Details |
|---|---|
| Model | Ford 6610 Mark III |
| Production Years | 1988–1991 |
| Series | Ford 10 Series (Mark III revision) |
| Manufacturer | Ford |
| Engine Power (Net) | 86 hp (64.1 kW) |
| PTO Power (claimed) | 73 hp (54.4 kW) |
| Drive Options | 2WD or 4WD |
| Operator Station | Four-post ROPS; cab optional with A/C |
2. Engine
The Ford 6610 Mark III is powered by a 4.4-liter Ford 4-cylinder diesel engine, an upgraded version of the proven powerplant used across the 10 Series lineup.
This engine is known for strong torque, excellent fuel efficiency, and long-term reliability—ideal for loaders, tillage work, transport, and PTO-driven implements.
| Specification | Details |
|---|---|
| Engine Model | Ford Diesel |
| Displacement | 4.4 L, 4-cylinder |
| Type | Liquid-cooled diesel |
| Net Engine Power | 86 hp (64.1 kW) |
| PTO Power (claimed) | 73 hp (54.4 kW) |
| Fuel Capacity (ROPS) | 21 gal (79.5 L) |
| Fuel Capacity (Cab) | 28 gal (106.0 L) |
| PTO Engine RPM | 540 @ 1900 rpm / 1000 @ 2060 rpm |
3. Transmission
The 6610 Mark III features a 16-speed transmission, designed for flexibility in both field and transport operations.
| Transmission | Details |
|---|---|
| 16-speed manual | Split-range gearbox for precise speed selection |
| Gears | 16 forward, multiple reverse speeds |
| Final Drives | Planetary type (high durability) |
| Differential Lock | Mechanical rear |
| Brakes | Wet disc brakes |
| Steering | Power steering (standard) |
4. Hydraulics
One of the major improvements of the Mark III version is its high-flow hydraulic system, suitable for heavy implements and loader work.
| Specification | Details |
|---|---|
| Hydraulic Type | Open center with closed-center valves |
| Pressure | 2,500 psi (172.4 bar) |
| Pump Flow | 18.2 gpm (68.9 L/min) |
| SCV Flow | 14.5 gpm (54.9 L/min) |
| Rear Hitch Type | Category II |
| Rear Lift Capacity (at ends) | 5,874 lbs (2,664 kg) |
5. PTO (Power Take-Off)
| Specification | Details |
|---|---|
| Rear PTO Type | Independent |
| Shaft | 1.375-inch |
| PTO Speeds | 540 / 1000 rpm |
| Engine RPM | 540 @ 1900 rpm / 1000 @ 2060 rpm |
6. Dimensions & Tires
| Category | 2WD | 4WD |
|---|---|---|
| Wheelbase | 87.5 in (222 cm) | 88.9 in (225 cm) |
| Item | Value |
|---|---|
| Weight | 7,280 – 8,760 lbs |
| Front Tire | 10.00–16 |
| Rear Tire (2WD) | 18.4–30 |
7. Electrical System
| Item | ROPS | Cab |
|---|---|---|
| Charging System | Alternator | Alternator |
| Charging Output | 45 amps | 80 amps |
| Battery Voltage | 12 V | 12 V |
| Battery Capacity | 128 Ah | 128 Ah |
8. Photos
Summary
The Ford 6610 Mark III embodies the peak refinement of Ford’s 10 Series tractors.
Its strengths include:
-
Powerful 4.4L diesel engine (86 hp)
-
Strong 73 hp PTO for demanding implements
-
High-capacity 18.2 gpm hydraulic system
-
Durable planetary final drives
-
Reliable 16-speed transmission
-
Large fuel capacity and improved electrical system
These features make the 6610 Mark III an excellent all-purpose tractor for farming operations in Africa, South America, Asia, and beyond.
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