I contacted the manufacturer and here is there reply.
No need for oiling or grease, but tip the scale on its side, and look
under the base. There will be four "connection points" where pivot pins
connect to the linkage assembly; see if any of those pins or linkage
points are bent or look different from the other ones.
Then, note down the serial number of the scale located on the side of
the base, or behind the column of the scale at the top or bottom of the
column, and call our Maryland repair center at 800-542-7322 ext. 111 and
speak with Tyson Long from 9:00 AM - 4:00 PM Maryland time to describe
the issue and for further troubleshooting over the phone.
I have attached our new catalogue in PDF format as well. FYI: The model
703 is a very popular, extremely heavy-duty, high-capacity digital
column scale that is a popular alternative to the mechanical physician
scales in the gym and schools environment.
seca north america west
Medical Scales and Measuring Systems seca corp.
3401 Centrelake Drive, Suite 320
Ontario, CA 91761
Telephone +1 909 605 7600
Telefax +1 909 605 7654