Fluke P3100 Series, User Manual

Page: 37 / 58

Maintenance and Servicing
Maintenance and Servicing
6
6-5
Piston Re-Assembly
13. Replace O-ring (7) in the counter-bore in the underside of the cylinder (F), ensuring
that it is located correctly and evenly.
14. Holding the piston by the larger “head” end, dip the other end into a container of
clean operating fluid, and transfer to the bore in the underside of the cylinder. Allow
the fluid to run through the bore. Repeat this 2 or 3 times to ensure a good film of
clean operating fluid exists in the cylinder bore.
15. Carefully introduce the piston into the underside of the cylinder, and push gently
through.
16. NEVER FORCE THE PISTON INTO ITS CYLINDER OR DAMAGE WILL
RESULT.
If resistance is felt, introduce more fluid. If resistance continues, re-clean
piston, cylinder or both. If, after repeated cleaning, the piston still will not slide freely
within the cylinder, then permanent damage may have occurred. In which case, the
parts should be returned to the factory for evaluation or replacement.
17. Insert piston/cylinder assembly into piston nut (5) through the threaded end, such that
the shoulder on the cylinder is located within the central bore of the nut.
18. Replace piston cap (4), and secure with set screw (3), DO NOT OVER-TIGHTEN.
19. Carefully screw the assembly into the instrument, ensuring that the o-ring (10) is
clean and undamaged, and correctly fitted to the piston post (11).
20. Replace weight carrier assembly (1 & 2), ensuring that it locates correctly on the
piston cap.
Replacement PCU Assembly
W
Caution
The piston and cylinder assembly is a matched pair, which is
calibrated and adjusted to a calculated mass figure. If, for any
reason, the piston or cylinder becomes damaged, then the
entire assembly must be replaced. The replacement assembly
consists of the following components: Item numbers
1 through 8.