In the UK, I woud always advise that, when checking the hydraulic systems, the lift function is checked over the whole range with the mast vertical. This will (a) prove that it works correctly, (b) lubricate the hydrualic ccylinders, (c) discharge any build-up of fluid over the pistons. With the fork arms lowered to eye level, the tilt and sideshift, and any other function should be checked. In some trucks, the extent of mast tilt at high level is restricted so any tilt check at this level is compromised.