OHAUS Pioneer PA64, Service Manual

Page: 47 / 116

CHAPTER 3 MAINTENANCE PROCEDURES
Pioneer Balances Service Manual 3-23 Ohaus Corporation www.ohaus.com
3.3.16 Disassembling Analytical Load Cells
3. To protect the Flexures, secure the Hanger to the Load Cell with two screws and the
shims supplied with the Service Fixture. Use two screws that were removed from the
Bottom Mounting Plate earlier. Insert them finger-tight in the holes of the Hanger.
(See Figure 3-58.)
4. Insert the shims (from the Service Kit) between the Hanger and the Load Cell on the
right and left of the Hanger. (See Figure 3-59.) Keep the screws finger-tight while
inserting the shims, to avoid risk of damaging the Flexures.
Figure 3-58. Screws removed from
Bottom Mounting Plate inserted
finger-tight into the Hanger.
Figure 3-59. Shims are inserted between
the Hanger and the Load Cell on the left
and right of the Hanger.
5. Tighten the two screws that
stabilize the Hanger.
6. Remove the two screws and
washers that secure the Top
Bracket, and lift it off.
(See Figure 3-60.)
NOTE:
Do not touch the two rear-most screws
with nuts on top. These are adjustment
screws.
Figure 3-60. Analytical balance Load Cell
with Top Bracket visible.
7. Remove the Vertical Flexure, which is located in the center of the Hanger. Loosen
the two screws that secure the Vertical Flexure to the Hanger. Carefully remove the
Lock Plate, washers and bushings, keeping track of their order (for later reassembly),
as illustrated in Figure 3-61.
Note : Be sure to lay the Flexure on a flat surface, to avoid bending it.
Screws
inserted in Hanger to secure it
Lock Plate protecting
Vertical Flexure
Shims
Adjustment screws
(Don’t touch.)
Top Bracket