Grain Systems Bucket Elevtors, Conveyors, Series II Sweeps PNEG-970 - Manual (Page 29)

PNEG-970 S2 Hopper w/ Collector Ring 29
Maintenance
2. Collector Ring Maintenance
A. Lubrication
1. All bearings are lubricated for life at the factory.
Additional lubrication should not be required.
2. CAUTION: Do not apply any lubricants or
solvent cleaning agents to any part of the slip
ring.
B. Brush Holders
1. Make the first inspection shortly after installation
and before operation. Make continuing inspections
on a regular basis after every 200-400 hours of
operation under normal conditions.
C. Brush Holders
1. Inspect brush holders for proper alignment.
Locate brush holders so that the entire brush
contact surface rides squarely on the ring with the
brush moving freely in the brush holder. Position
brush holders so that the brush makes contact
with the middle of the conductor and is not offset.
2. Check brush holder clamps for tightness. Set
clamp bolts at 10 in-lb max.
3. Inspect brush terminations at the holder to assure
that no external force is imposed on the holder.
We recommend flexible or soft wire leads for
these terminations. Use external clamps to
support the entire weight of the leads.
D. Brushes
1. Inspect for wear. If the distance from the top of
the insulator to the lower part of the brush spring
is 0.093" or less, replace the brush.
3.2.4 Brush Springs
3.2.4.1 Inspect and test
brush springs to assure
uniform brush pressure. If
brush springs fall below
recommended pressure,
replace entire brush holder .
Brush
ž
“ ž
Ring Surface
Brush Holder
Insulator
Cross-bar Seated
in Brush Slot
Brush
Amperage
Spring
Pressure
15 1.0 lb. min
35 1.5 lbs. min
75 3.0 lbs. min
Table 3.3.3 Brush Spring Tension
Brush Spring
5 lb. Scale
2. Inspect brush contact surface by removing the
brush. Remove surface dirt, oxidation, pitting, or
other contaminants (with a wire brush).
Brush
Replace Brush
@ 0.093"
Insulator
3. To remove and replace the brush:
a) remove the clamp screw from the brush
holder
b) remove the screw from the brush lead
c) remove the brush holder
d) replace the brush
e) reassemble.
E. Brush Fit Inspection
1. Brushes must run at 90° ± 3° square on the rings.
If brush is not square, adjust position of brush
holder on brush post.
2. Brushes need not run on the center of the rings,
but there should be no forceful friction against the
insulators.
3. The brush spring cross-bar must be seated in the
brush slot.
F. Brush Springs
1. Inspect and test brush
springs to assure uniform
brush pressure. If brush
springs fall below
recommended pressure,
replace entire brush holder .