Your lift is made by ALM here is the parts manual,
http://www.flamingoshopserv.com/portals/2/news/partsbreakdown/alm%207001%20%207001a%20%209001%20parts%20breakdown.pdf
Here is their website your model is still listed.
http://www.alm-autolift.com/lifts_automotive_car_auto_lifts.php
CC