Thomas PROTOUGH 900 - 4.7 As Required Service

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4. MAINTENANCE
4.7 AS REQUIRED SERVICE
4.7A Screen Replacement
The shaker screens will need replaced
whenever they have worn out, broken or soil
conditions require different sizing.
The top screen or plate is held in place by
tension bars on both sides of the screen or plate
(T90034). This is called a side tension type.
The bottom screen is held in place from ten-
sion applied from one end (T90034). This is
called an end tension type.
To replace the shaker screens and or top plate.
1. Shut off the engine and remove the key to
prevent accidental start up.
2. Depending on which screen is to be replaced,
remove the 8 side bolts for the top screen or
plate (4 each side, fig. T90034), or the 6 end
tension bolts located at the left side of the
machine.
3. Remove the tension bar(s). It may be neces-
sary to apply weight to the screen, and use a
pry bar, to release the tension bars from the
screen or plate.
4. Before replacing the screen or plate, check
the crown bars and crown bar rubbers for
damage. (T90081 & T90082) Repair as
required.
The shaker screens are very heavy. Use a
lifting aid such as a hoist to prevent
possible injury.
CAUTION
T90034
Bottom Screen
Tension Bar
Tension Bar
Top Screen
T90082
Crown bar rubber
T90081
Crown bar rubber