Our forklift has started acting a bit stranger than usual. Boss got on the other day and it wouldnt move, like a brake was on or something. he finally got it to move but when u first start using it it makes alot of clicking type noises and they seem to be related to speed changes so pressing the pedal for forward will start moving slow then a click and it moves to a faster gear almost. seems like after using it for awhile the problem kinda goes away. help