Zetor Forterra 8641

The Zetor Forterra 8641 is a tractor produced by Zetor. It is equipped with a 253.6 ci 4.2 L engine. The listed engine power is Diesel (listed): 85 hp / 63.4 kW. Transmission: 24 forward and 18 reverse. Operating weight: 8708 lbs 3949 kg.

Engine Power

Diesel (listed): 85 hp / 63.4 kW

Fuel & Capacities

47.6 gal 180.2 L

Transmission

24 forward and 18 reverse

Operating Weight

8708 lbs 3949 kg

Overview

	1999 - 2007 Model year 1999-20022002-2007 Forterra Series

Production
Manufacturer	Zetor
Built in Brno, Czechoslovakia

Zetor 8641 Engine
Zetor 4.2L 4-cyl diesel
Fuel tank	47.6 gal 180.2 L
Engine details ...

Zetor 8641 Transmission
24-speed synchronized
Transmission details ...

Zetor 8641 Power
Engine	85 hp 63.4 kW

Mechanical
Four-wheel drive
Power steering
Wet disc brakes
Cab standard with available air-conditioning.

Hydraulics
Pump flow	15.85 gpm 60.0 lpm

Tractor hitch
Rear lift	10582 lbs 4799 kg

Power Take-off (PTO)
Rear PTO	independent
Rear PTO Type	540/1000

Dimensions & Tires
Wheelbase	93.7 inches 237 cm
Weight	8708 lbs 3949 kg
Front tire	13.6-24
Rear tire	18.4-34
Full dimensions and tires ...

Electrical
Ground	negative
Battery volts	12

Engine

Engine Detail — 253.6 ci / 4.2 L Diesel

Manufacturer	Zetor Z 1203
Configuration	turbocharged diesel, 4-cylinder, liquid-cooled
Displacement	253.6 ci 4.2 L
Bore/Stroke	4.13x4.72 inches 105 x 120 mm
Power	85 hp 63.4 kW
Rated RPM	2200
Torque	219.1 lb-ft 297.1 Nm
Torque RPM	1450
Starter	electric
Starter volts	12

Transmission

Transmission — 24 forward and 18 reverse synchronized

Type	synchronized
Gears	24 forward and 18 reverse
Clutch	hydraulic dry disc

Dimensions

Zetor 8641 Tires
Standard tires (ag)	Front: 13.6-24. Rear: 18.4-34

Dimensions
Wheelbase	93.7 inches 237 cm
Length	172 inches 436 cm
Height	106.7 inches 271 cm
Weight	8708 lbs 3949 kg

Photos

Zetor Forterra 8641 tractor photo

Recommended Implements & Sizing Guide

Engineering recommendations for Zetor Forterra 8641 based on its 85 HP power envelope and ASAE agricultural standards.

Implement & Operation	Recommended Size	Workload Rating	Engineering Notes
Moldboard PlowPrimary Tillage	3 to 4 Bottom (16")3 - 4 铧 (40 cm)	Heavy Duty	Suitable for medium loam and stubble turnover.
Rotary Cutter / MowerMowing & Clearing	7 to 8 ft (84-96 in)2.1 - 2.4 m	Heavy Duty	Heavy-duty twin spindle cutter for overgrown acreage.
Rotary TillerSeedbed Prep	78 to 84 in200 - 215 cm	Heavy Duty	Heavy commercial tiller with multi-speed gearbox.
Disc HarrowSecondary Tillage	10 to 14 ft Tandem / Offset3.0 - 4.2 m 重型交错耙	Heavy Duty	Aggressive residue cutting in corn/cotton stubble.
Hay BalerHay & Forage	4x4 to 4x5 Round Baler1.2x1.5 m 紧凑圆捆机	Heavy Duty	Silage and dry hay; 540 RPM PTO with slip-clutch.

Sizing & Soil Condition NoteActual implement sizing varies depending on local soil conditions (heavy clay vs sandy loam), field slope, and operating speed. Heavy tillage implements may require front ballast weights and wheel weights.

Fluids, Capacities & Working Autonomy

Standard fluid requirements, service intervals, and continuous runtime estimates for Zetor Forterra 8641.

Estimated Continuous Field Runtime: 10.8 hrs

Approximately 10.8 hours of continuous field operation at ~75% rated power on a full tank (47.6 gal / 180.2 L).

Estimated 75% Load Fuel Burn~4.4 gal/hr (16.7 L/hr)

Engine Crankcase Oil

SAE 15W-40 (Heavy Duty Diesel)

Standard Spec: API CK-4 / CJ-4 Heavy Duty

Service Interval: 150 – 250 Hours

Transmission & Hydraulic System

UTTO (Universal Tractor Transmission Oil)

Standard Spec: ISO VG 46 / 68 (Wet Brake & Trans Compatible)

Service Interval: 600 – 1000 Hours

Engine Cooling System

50/50 Ethylene Glycol Pre-mix

Standard Spec: ASTM D6210 / Heavy-Duty OAT Antifreeze

Service Interval: 2 Years / 1500 Hours