Belts - Gilson Porta-Screen PS-4 Operating Manual

Gilson Company, Inc.
Bearing (#52) after every 80—100 hours of operation.
a. Rotate Drive Shaft (#20) slightly by hand until the
grease fitting at the lower end of the Connecting Rod
(#50) is accessible. (Grease fitting may be pointing
either to the front or to the back of the Porta-Screen
b. Apply a small amount of any good-quality bearing
grease.
c. Proceed to shaft bearing lubrication.
Shaft Bearings: There are two Bearings (#47), front and
5.
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.
Idler Pulley Bearings: These sealed Bearings (#62) do
7.
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).
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Gilson Porta-Screen
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. Reas-
semble.
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,
® : PS-3 & PS-4