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3rd gear on 12245 is same as 2nd gear on 14245. It is some how weard to connect. Sometimes you must like "hit" it in. Maybe it is the lever mechanism or wrong designed geometric. I havent got it i stuck anyway yeat :-x
Markku, it depends on what transmission is used, the 30 km/h or 40 km/h with overdrive on the 4th gear.
The 142 and 16245 were only sold with the overdrive transmission because the 1st gear (high reduction) would generate too much torque on the main shaft.