International Harvester 686 Transmission specs

The fastest speed on record for a 686 is 18.6 mph (30 km/h). The gearbox itself is not on record yet.

9 transmission values on record for the 686.

Engine power, claimed · gross or net not stated

66.1 hp

49.3 kW as stated by the source

No lab test on file

Claimed · standard not stated by the source

Source · Traktorenlexikon, “IHC 686”, claimed

This is the maker’s own figure, measured at the engine. Power at the PTO is lower — by how much, for this machine, nobody has measured.

How fast will a 686 go?

The fastest speed on record for a 686 is 18.6 mph (30 km/h). The gearbox itself is not on record yet.

Transmission — 686 Transmission
Drive	2WD
Forward gears	5–10the article lists alternatives
Reverse gears	1–2the article lists alternatives
Transmission as described	5 forward/1 reverse and 10 forward/2 reverse
Clutch	pedal-operated dry single-plate clutch
Top speed forward	18.6 mph · 30 km/h
Top speed reverse	3.0 mph · 4.83 km/hhighest reverse speed printed in the article's speed tables
Differential lock	Mechanically operated differential lock
Front axle	swinging, extensible front axle

Source · Traktorenlexikon, “IHC 686”

9 transmission values from Traktorenlexikon, “IHC 686”.

Sources checked

14 SEP 2026

Facts taken from these documents, units converted. Numbers beside a figure refer to this list. Licences and attribution

Traktorenlexikon: IHC 686 — CC BY-SA 4.0, WIKIBOOKS-TL-118937 · revision 1035394. Wikibooks contributors (Traktorenlexikon). Original document