Collector Ring Maintenance, A. Lubrication, Ring

Cross-bar Seated in Brush Slot

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

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

1. Brushes must run at 90° ± 3° squareìûon 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.

Brush Holder

Brush

Insulator

Ring Surface

is 0.093" or less, replace the brush.

Brush

Replace Brush

@ 0.093"

F.3Brush.2.4 BrushSpringsSprings

1.3Inspect.2.4.1 andInsptestct brushand test springsbrush tosprinassureg uniformto assure brushniformpressurebrush. Ifpressurebrush . If

recommended pressure, replace entire brush holder .

replace entire brush holder .

151.0 lb. min

351.5 lbs. min

753.0 lbs. min

Table 3.3.3 Brush Spring Tension

Insulator

2.Inspect brush contact surface by removing the brush. Remove surface dirt, oxidation, pitting, or other contaminants (with a wire brush).

5 lb. Scale

Brush Spring

PNEG-970S2 Hopper w/ Collector Ring