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7-2 100-214-281 Rev. 07
Chapter 7: Maintenance
Periodic and Preventive Maintenance
7.2.2 Recondition the Stack (
converter, booster, and horn
)
Stack components function with greatest efficiency when the mating interface surfaces are in
proper condition. For 20kHz and 30kHz products, a Branson Mylar washer should be installed
between the horn and the booster, and booster and converter. Replace the washer if torn or per-
forated. We recommend that stacks using Mylar washers be inspected every three months.
Stacks used with silicone grease, as with certain 20 kHz installations and with all 40 kHz prod-
ucts, should be periodically reconditioned to eliminate fretting corrosion. We recommend that a
stack using silicone grease be inspected every two weeks for corrosion. The inspection interval
can then be adjusted longer or shorter as required, when experience is gained for specific stacks.
See the Branson instruction manuals for correct stack interface reconditioning procedures.
NOTE
i
i
The operating efficiency of the equipment will be greatly affected if the mating
interfaces of the converter, booster, and horn are not flat, make poor contact with
each other, or become corroded. A poor contact condition wastes power and
makes tuning difficult. It may also affect the noise level and damage the converter.
To recondition the interfaces:
1. Remove the stack from the actuator.
2. Disassemble the converter, booster, and horn stack. Observe the following rules:
In the event that you must disassemble a Stack, always use the correct spanner wrench and a suit-
able soft-faced vise to remove a horn or booster, and reverse the procedures described earlier in
this Section.
CAUTION
!
NEVER attempt to remove a horn or booster by holding the converter housing or
booster clamp ring in a vise.
NOTE i
i
Use a soft-jawed vise (brass or aluminum) to remove square or rectangular horns,
or horns otherwise unremovable, by reversing the procedure detailed in Section
4.8 Assemble the Acoustic Stack, beginning on page 4-31 .
3. Wipe the interfaces with a clean cloth or paper towel.
4. Examine all interfaces. If any interface is corroded or shows a dark, hard deposit, it should
be reconditioned.
5. If the interfaces appear to be in good condition, go to step 13.