Thomas PROTOUGH 900, Owner/Operator And Parts Manual

Page: 52 / 165

50
4. MAINTENANCE
5. When replacing the screen or plate, fol-
low the torque tightening sequence
(T90034). Start from the middle, tighten
the bolts in a criss - cross pattern to
torque the top screen to 466 lbs. (632
Nm), and torque the lower screen to 120
lbs. ft (163 Nm) (T90034).
6 Ensure the screens are tight against the
crown bar rubbers. If necessary, tighten
the bolts further, in 25 lbs./ft. (34 Nm)
increments, until the screen is tight
against the crown bar rubbers.
7 Start the engine and engage the shaker
to verify. The screens must not bounce
freely on the crown bar rubbers. You
will notice if the screens are loose by
the rapping noise they will make. If
necessary, tighten the bolts further, in 25
lbs./ft. (34 Nm) increments, until the
screen is tight against the crown bar
rubbers.
Every 4 hours, torque the bolts retaining
the screens to the screen deck.
IMPORTANT
The shaker screens are very heavy.
Use a lifting aid such as a hoist to prevent
possible injury.
CAUTION
Screen bolt tightening sequence
T90034
Bottom Screen
Tension Bar
Tension Bar
Top Screen