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 TM 55-4920-201-14
SECTION VI
TROUBLESHOOTING
REMEDY
PROBABLE CAUSE
TROUBLE
Increase sensitivity. (Refer to
Sensitivity setting incorrect.
Balancing arbor lacks sen-
section VII for calibration
sitivity.
procedure).
Check to insure arbor and
Physical interference with
Balancing arbor remains
balancing assembly are
arbor or suspended mass.
tilted. Indicator cannot be
suspended free of interference.
centralized.
Reduce sensitivity. (Refer to
Sensitivity setting incorrect
section VII for calibration
balancer unstable.
procedure).
Loosen indicator bushing and
Interference between indicator
Balancer indicator seems to
raise to provide 0.002 to
bushing and top end or arbor.
catch or lock in various
0.003-inch clearance. Re-set
positions.
bushing set screw. (Refer to
Isolate from air disturbance.
Air currents disturbing
Balancer
oscillates
excessively.
balancing assembly.
Re-fill arbor fluid reservoir.
Loss of dash-pot oil. Dash-pot
(Refer to section V).
oil viscosity too low.
Refer to section V.
Dash-pot oil too cold or
Balancing arbor response is
viscosity too high.
too slow.
Check
for
security of
Cones or other adapters
Balance indications in-
mounting, nicks, or foreign
consistent.
improperly seated.
matter on adapter or balancing
assembly mating surfaces.
(Refer to section VI.
Check for movement of
Shifting of balancing assembly
assembly parts. Insure con-
parts.
sistent positioning of moveable
parts.
6-1/(6-2 blank)
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