Hello... i was tasked by my company to fix a forklift. I was told by the operator that the forklift wasnt going at the normal speed of about 6 mph. when i drove the forklift to the maintenance area. The forklift drove about 4mph. The mechanic before me ordered a L/S brake kit. which was for the wrong side, but i could use the inner parts..ie: brakes (5) and spacers (6). so i replaced the the brakes and spacers. After putting it all back together. The Forklift is now a bit slower. well, when i just started off it speeds up to 5 mph.. press the brake, start up again and its at 4 mph and gradually goes down to 3 mph. also seems to have a smell of the oil in the hub or motor. but when checking the temps. they seems to be ok.

Im pretty stumped on where to begin my trouble shooting. I believe it could be the motor but yet. the problem only happens when i accelerate when the forklift has been sitting for a long period of time. It can easy get up to 5 mph quickly, but after that first stop no matter brake pedal or not using the brake pedal. it goes down just like i explained up there. Something tells me this could be very simple but i dont know where to start. im new at this and i have no idea... i dont know if adjusting the speed is possible maybe? i believe its adjusted out all the way from checking the panel on the forklift. oh and i also bled the brake lines as well.

I could really use some of your input. its a Doosan B20T-5 electric fork lift.