Hammond Model A, Manual, Page: 141 / 298

MOVING THE FLUID TYPE
The reverberation unit appears to be a delicate device but when once set up it is
very dependable and requires no further attention. When a tone cabinet is moved even
a few feet, however, the reverberation unit must be locked to avoid excessive
vibration of the springs. If the cabinet is to be tilted, the unit must be removed,
to avoid spilling the fluid, and replaced after moving. If the unit itself cannot be
kept upright while moving, the fluid must be drained and later replaced. Hammond
damping fluid is a grade especially selected for this purpose, and no other kind
should be used.
Failure to lock the unit when moving usually necessitates replacement of
the complete driver assembly or the upper or lower lever assemblies
which are a part of it. When parts are replaced, the springs must be balanced
as follows:
In a complete driver assembly ordered for replacement, the
wire passing through the unit from the upper lever to the stirrup
is not soldered. It should be left unsoldered until this adjustment
is made. Replace the driver assembly and attach all the
springs; check and adjust the single damping tube, if necessary,
to make the upper lever assembly level. Then solder the wire
to the small tube passing through the voice coil. When only the
upper or lower lever assembly is replaced, the wire need not
be unsoldered, but the upper level must be made level by adjusting
the single tube.
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