TABLE I
BEARING DEFECTS
(Failures – Replace if found)
DEFECT (Failure)
Flaking and cracking
APPEARANCE
In the early stages, the surface of the
inner
and outer races develop small cracks,
which
flake. The cracks and flaking ultimately
spread over the entire race surface.
PROBABLE CAUSE
1.
Normal fatigue failure.
Bearing loads in excess of bearing capacity caused by misalignment.
Indentations
Indentations or cavities in the inner and
outer races.
1.
Dirt in the bearings.
2 Excessive impact loading of the bearings such as improper
mounting or removal.
Broken separator (cage)
Cracked separator or separator in pieces.
Poor Lubrication.
1.
Misalignment of shaft.
2. Excessive
shaft
deflection.
Wear
Bore and OD of outer ring of bearing
galled or braided.
1.
Fit on shaft or in housing too loose.
2 . Bearing locked by dirt and turning on shaft or in housing.
Fractured ring
Hairline cracks or complete ring fracture.
1.
Forcing a cocked bearing on or off a shaft.
2.
Too heavy a press fit.
Discoloration
Rolling elements and races darker than
Normal appearance of bearing metal.
(Moderate discoloration of rolling elements
and races not a reason for discard.)
1. Inadequate lubrication.
Corrosion
Rolling elements and raceways rusted.
1.
Water entering the housing.
2.
Condensation inside the housing.
Lubricant breaks down into acid. (Wrong lubricant.
TABLE II
TORQUE
VALUECHART
TORQUE VALUE (FT-
LB)
TORQUE VALUE CHART
TORQUE VALUE (FT-LB)
SIZE INCH
MEDIUM CARBON STEEL, SAE 5,
105-120,000 PSI, MAT’L CODE
509
3/4 210-225
7/8 305-325
1 450-475
1-1/8 605-635
1-1/4 850-890
1-1/2 1465-1525
Torque values shown are for clean and
lubricated threads: gasketed joints.
Studs must be driven tight in lower casing
when used. Install upper case, tighten center
nut (or cap screws) then work out from center
to each side, tightening with torque wrench to
values shown in Table II.
2883820
TABLE III
GREASING FREQUENCY
(See Table IV for amounts)
SERVICE
Normal, 8-hour day operation,
Room free of dust and damaging
atmosphere.
GREASE EACH
6 Months
Severe, 24-hour day operation.
room with moderate dust and/or
damaging atmosphere,
or outdoor service.
1 Month
Light, approximately 10-hour
eek. Room relatively free of dust
and damaging atmosphere.
1 Year
TABLE IV
AMOUNT OF GREASE FOR BALL BEARINGS
OUNCES GRAMS
MODEL
1.3
1.4
2.0
3.0
4.5
5.8
9.5
17.0
36.4
39.2
56
84
126
162.4
266
476
1½TU7, 1½TUT7-3, 15TU7A2,
15TUT7A3
2TU8, 2TU8A2, 2TU10, 2TU10A2,
2TU10G2, 2TU12, 2TU12A2, 3TU10,
3TU10A2
3TU13, 3TU13A2, 3TU13G2,
3TU13½, 3TU135A2, 3TU135G2,
4TU14,4TUF5, 4TU14A2, 4TU14G2,
4TUF14, 4TU11A2, 4TUF11,
3TUT13, 3TUT13A3, 3TUT13G3
5TU15, 5TU15A2, 5TUF7
5TU13, 5TU13B, 5TU13B2,
5TUF13B, 6TU16, 6TU16B,6TUF10,
6TU16C2, 6TU16G2, 5TUT16,
5TUT16B, 5TUT16C3, 5TUT16G3,
5TUT16N3, 5TUTF16
8TU16, 8TU16A2, 8TU16F,
8TU16G2, 8TU17, 8TUF15
10TU22B, 10TU22C, 10TU22C
10
