The Phase Variator housing is made from cast
aluminum. The input and output shafts are fabricated
from steel and have a black oxide finish. The
input/output shafts and all internal sprockets
are supported by needle bearings with separate
oil seals. The combination of the above features
provides for a long, trouble-free life.
The control knob has an internal thread and engages
a centrally located thread shaft which is pinned
to the sliding yoke assembly. Rotation of the
knob thereby raises and lowers the yoke.
The control knob ratio is 36:1. That is, one full
turn of the control knob produces a 10° change
in the rotational location of the output shaft
relative to the input shaft. See principle of
operation for position adjustment directions.
If chain wear becomes excessive, the chain may
be tensioned without disassembling the unit. The
control knob must be rotated until the sliding
yoke assembly is at the bottom of its travel.
Next, remove the two allen head screws located
on the bottom of the housing, exposing the adjusting
screws in the base of the yoke assembly. The equal
tightening of these screws increases chain tension.
After adjustment, the shafts should turn freely
with no appreciable backlash.
All Phase Variators are shipped from the factory
with a multiple purpose grease lubricant. Although
all working parts are well protected, repacking
of the bearings may be required in severe operating