to answer some of the questions, the tilt leveler button as has been said will not help a good driver. But that is not all it does, try this on an SAS truck with no load for safety reasons. With the mast tilted back past vertical. Lift the forks to the top, and power them against the stop untill the relief valve blows, now tilt forward, the mast won't go past vertical, lower the forks a little bit, now it will tilt fully forward. This is part of the SAS safety feature to stop operators tilting forward with aload at height. If you look at the mast you will see a load sensor in the hydraulic line that weighs the lload and a switch that signals forks over a set height. The swing lock cylinder on the steer axel should be checked by the technician on a service, he has to measure the spring lenght on an accumalator that maintains pressure in the swing lock cylinder, if it is out of tolerance it has to be replaced. Error codes that come up on the dash in place of hours run indicate faults on the system on 7 series. The new 8's are different. Th active steering syncroniser brings the steering wheel spinner always back to the 8 0 clock position for driver comfort............this I must admit is a bit of bull **** but its there and is a selling point!