Furuno FSV-25 Operator's Manual page 148

8. MAINTENANCE, TROUBLESHOOTING
9. Unfasten three screws to remove the waterproofing cover.
10. Use a gap gauge to measure the gap between the fixed core and the moving core.
Insert the leaf of the gap gauge horizontally to the place of measurement. Take
the measurement. Measure the gap at three places.
Gap adjustment
shim
Measure gap here.
11. If the gap measured at step 10 is approx. 0.7 mm, do the following to reduce the
gap. (If you can insert the 0.7 mm leaf, do steps 1) to 3) below.)
1) Loosen three bolt assy. to remove spacer, gap adjustment shim, bolt assy.,
and fixing plate.
Note: Be careful not to loose the gap adjustment shim.
2) Reduce the amount of gap adjustment shims (thickness of shim: approx. 0.2
mm), then install the spacer, gap adjustment shim, bolt assy. and fixing plate.
3) Measure the gap. The gap must be between 0.3 and 0.4 mm. (Confirm that the
0.3 mm leaf can be inserted, but the 0.4 mm leaf cannot.)
12. Reassemble the motor brake. Coat the set bolt for the fan with thread-locking fluid.
8-22
Waterproofing
cover
Loosen two wing screws to slide the
cover and remove the gap gauge.
Bolt assy.
Spacer
Leaf
Gap gauge
Fixing plate
Moving core
Fixed core