TM 5-3895-346-14
MAINTENANCE
ROLLER MAINTENANCE
ROLLER MAINTENANCE
Eccentric Shaft Oil Seal Replacement
When it becomes necessary to change the eccentric shaft oil seal, it may be done without removing the roll
from the frame or the eccentric shaft from the roll.
To remove the eccentric shaft oil seal, remove sheave access covers and belts from the frame. The eccentric
shaft sheave with shaft, bearings, and housing, and half of the drive shaft may be removed by unscrewing the
drive shaft dust cover and unbolting the sheave mounting assembly from the frame.
Next, unbolt the inner half of the drive shaft from the eccentric shaft and remove the remaining four bolts from
the end of the eccentric shaft; a stub shaft with a collar. Insert a squarehead jackscrew in end of eccentric stub
shaft which will remove the stub shaft and collar, and will pull the seal out at the same time.
Seal surface on the eccentric stub shaft is a wear sleeve pressed on the shaft. It should be replaced if grooved
or rough. Replacement requires the use of a piece of round material of sufficient length and proper diameter to
drive the new seal into place.
Stub shaft, drive shaft, and the remaining assemblies should be replaced in the reverse manner to the
disassembly as described above. When reassembling the splined parts of the eccentric drive shaft, make sure
the same crosses on both ends of the drive shaft line up (are in the same plane), otherwise uneven speeds will
result between the input and output shaft halves.
Eccentric Shaft Bearings
No maintenance is required except as called for in the lubrication instructions. The eccentric shaft has two
spherical roller bearings: one in the right-hand end and one in the left-hand end of the roll. Normal operating
temperature should not exceed 200 . To measure the temperature, use a Stewart Warner D-361-T gauge or
F
similar. Rotate the roll until the oil fill drain holes are in top position and remove the plugs, one in each end of
the roll near the cone. Insert the temperature gauge sensing unit and feed it until it is submerged in the oil.
Wait until temperature gauge reading does not rise anymore to get a true reading. Remove gauge and sensing
unit, and replace plugs.
If it becomes necessary to replace an eccentric shaft bearing, the roll and frame must be disconnected. Since
the roll weighs 7,200 pounds it will be easier to lift the frame from the roll. (The frame weighs approximately
3550 pounds.) After disconnecting the yoke assembly and the eccentric drive shaft from the power end of the
unit, hoist frame up and over the roll. The front and rear scraper bars must also be removed from the machine
before lifting frame from roll.
Removal and Replacement of the-L.H. Eccentric Shaft Bearing (Opposite To Drive Side)
Removal - Remove the thrust cap and frame suspension assembly consisting of a suspension beam, rubber
mounts, mounting plates, and bearing housing with bronze flange bearings. For the removal of the eccentric
shaft bearing from the eccentric shaft and roll, it is necessary to have at least one tool
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