Pacemaster pro-plus Treadmill belt was slipping. I adjusted…

well the two symptoms don't come from the same thing.

Slipping:
* take nail polish or paint and place a mark starting on the front roller pulley and going onto the front roller metal shaft
* then try to walk on it and see if the white mark separates
* if it does then the roller is bad and would need replaced or tap screws placed through the pulley into the metal shaft to hold it in place
* if it doesn't separate then the drive belt is slipping and most likely will need replaced, although you could try spraying belt dressing on it to see if that would be a temporary fix.
* if neither of these is your problem and the walk belt is slipping then you will need to try to adjust the screws in the back of the treadmill through the end caps. these are allen wrench screws.
Tighten each one the same amount such as 1 full turn to start with.
see if you can now walk without it slipping.
If not then tighten 1-2 more turn on both sides.
If after 2-3 full turns it is not tight enough
I would recommend replacing the walk belt.

speeding up and shutting down:

usually indicates a failed motor controller. You can test the motor by doing the following:

# XXXXX a 12-18 volt dc battery fully charged(like one from a cordless drill)
# XXXXX sure it is fully charged, because it won't work if not
# XXXXX the + and - to the motor red is + and black is -
# XXXXX the motor turns slowly your motor is ok, if not the motor is bad and would need replaced along with the motor controller
# XXXXX the motor is ok then just your motor controller(the board with the metal) is malfunctioning and would need replaced.