Rhinochugger
Retired Oik
Tooooooo simpleErrrrr...
Back off on the throttle??
Sounds to me like the Mack is highly geared, and possibly only a 3 pole motor.
EDIT
Did a bit of google, and the general reports are that the HLW Mack mechanism is pretty good - so if it needs a high starting current, and goes off like a startled rabbit, then probably the commutator is a bit dirty where the brushes rub, or the full current is getting though to the brushes.
Last edited: