Belts - Gilson Porta-Screen PS-3 Operating Manual

Gilson Company, Inc.
rod (#50) is accessible. (Grease fitting may be
pointing either to the front or to the back of the
Porta-Screen ).
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b. Apply a small amount of any good-quality bearing
grease.
c. Proceed to shaft bearing lubrication.
5. Shaft Bearings: There are two bearings (#47), front
and rear, on the drive shaft (#20), and two bearings
(#41), front and rear, on each of the two counterweight
shafts (#12, 13). Some Porta-Screens have sealed
shaft bearings; others have shaft bearings with grease
fittings. If the shaft bearings on your machine have
grease fittings, lubricate the bearings after every
80—100 hours of operation.
a. WITH ELECTRIC POWER DISCONNECTED
AND LOCKED OUT, and trays, pan, and upper
case cover removed, remove lower front and rear
case covers.
b. Apply a small amount of any good-quality bearing
grease.
c. Reassemble in reverse order.
6. Motor Bearings: Lubricate annually.
a. Remove trays, pan, and upper case cover.
b. Remove lower front and rear case covers.
c. Find and remove the oil plugs at each end of the
motor.
d. Insert a few drops of oil.
e. Replace plugs.
f. Reassemble in reverse order.
7. Idler Pulley Bearings: These sealed bearings (#62)
do not require lubrication.

4.3 Belts

The Drive Belt (#22) should fit snugly. If the belt is too
tight, it will soon wear out, causing bearings to wear and
resulting in noisy operation. A loose belt may cause the
unit to run too slowly or to slip. Keep the drive pulley
(#21) and motor pulley (#60) aligned so that the drive
belt is straight.
The Timing Belt (#16) should fit tightly.
Access to Belts:
1. DISCONNECT AND LOCK OUT ELECTRIC POWER.
2. Remove and set aside trays and pan.
3. Remove all case covers.
4. Drive Belt: Check tension by pressing on the span
of the belt. If properly adjusted, the belt should be
deflected 1/64th of the value of the distance between
the pulleys. To adjust or remove, loosen the motor
mounting bolts (#61); and the motor will slide up,
loosening the belt tension.
a. To adjust, move the motor up or down until the
belt tension is correct. Retighten the nuts.
b. Or remove the loosened belt if it is worn, and install
a new one. Obtain the correct tension by moving
the motor up or down. Retighten the nuts.
c. Continue or reassemble.
5. Timing Belt: Check tension by pressing on the span
of the belt. The belt should be tight. To adjust or remove
the timing belt, loosen the two idler bracket mounting
screws (#45). Loosen the nut on the adjusting screw
(#46).
a. To tighten:
b. To replace:
(1) Rotate drive shaft (#20) until the connecting
rod (#50) is at its highest position.
(2) Rotate counterweight shafts (#12, #13) until
counterweights are at their lowest position.
(3) Fit the belt around the left counterweight shaft
pulley, around the timing pulley (#49), above
the right counterweight shaft pulley, and around
the idler pulley (#19).
(4) Tighten the idler bracket adjusting screw until
the timing belt is tight, making certain that
you do not change the position of the shafts.
Lock the idler bracket in position with the nut.
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Gilson Porta-Screen : PS-3 & PS-4
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Turn in the adjusting screw to pull
the bracket (#17) down and increase
tension on the belt. Retighten the
nut to hold the bracket in position.
Reassemble.
Loosen the adjusting screw to permit
the idler bracket to move upward,
loosening the tension on the timing
belt so that you can remove it. Before
reinstalling belt,