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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.
5.
Shaft Bearings: There. are. two. Bearings. (47),. front. and.
rear,. on. the. Drive. Shaft,. 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.bear-
ings. 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.
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.
1.. To. adjust,. move. the. motor. up. or. down. until. the. belt. ten-
sion.is.correct...Retighten.the.nuts.
2.. 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.
Gilson's Porta-Screen
®
3.. Continue.or.reassemble.
Timing Belt: Check. tension. by. pressing. on. the. span. of. the.
belt.. The. belt. should. be. tight.. To. adjust. or. remove. the. Tim-
ing. Belt,. loosen. the. two. Idler. Bracket. Mounting. Screws. (45)..
Loosen.the.nut.on.the.Adjusting.Screw.(46).
1.. To tighten:.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.
2.. To replace: Loosen.the.adjusting.screw.to.permit.the.idler.
bracket.to.move.upward,.loosening.the.tension.on.the.Tim-
ing.Belt.so.that.you.can.remove.it..Before.reinstalling.belt:
a.. Rotate.Drive.Shaft.(20).until.the.Connecting.Rod.(50).is.
at.its.highest.position.
b.. Rotate. Counterweight. Shafts. (12,13). until. counter-
weights.are.at.their.lowest.position.
c.. Fit.the.belt.around.the.left.Counterweight.Shaft.Pulley,.
around.the.Timing.Pulley.(49),.above.the.right.Counter-
weight.Shaft.Pulley,.and.around.the.Idler.Pulley.(19).
d.. Tighten.the.idler.bracket.adjusting.screw.until.the.Tim-
ing.Belt.is.tight,.making certain.that.you.do.not.change.
the. position. of. the. shafts.. Lock. the. idler. bracket. in.
position. with. the. nut.. Tighten. the. bracket. mounting.
screws.
e.. Reassemble.
DO NOT PLUG IN THE PORTA-SCREEN
READY TO USE IT.
4.4 BEARING REPLACEMENT
1.
Guide Bearing Assemblies: .The.Porta-Screen®.has.three.
guide.bearing.assemblies:.each.has.a.housing.and.guide.
bushing..The.two.Upper.Guide.Bearings.(34).are.mounted.
to. the. top. frame. crossbar.. The. Lower. Guide. Bearing. (59).
is.mounted.to.the.underside.of.the.vibrating.unit.
.
If. you. notice. side-to-side. movement. of. the. vibrating. unit.
during. operation,. inspect. the. guide. bearings. and. replace.
them.if.necessary..We.recommend.replacement.of.all.three.
assemblies.at.the.same.time.
a.. DISCONNECT.AND.LOCK.OUT.ELECTRIC.POWER.
b.. Remove.and.set.aside.trays.and.pan.
c.. Remove. Top. Frame. Screws. (2),. and. lift. off. Top. Frame.
Crossbar.(1).
d. Upper:
(1). Remove. Mounting. Screws. (35). to. detach. Bearing.
Housing.
(2). Replace.with.new.Bearing.Housing.Assembly.
e. Lower:
(1). Remove.all.case.covers.
(2). Remove.the.Connecting.Rod.Mounting.Bolt.(24).
(3). Lift.the.entire.vibrating.unit.assembly.up.and.out.of.
the.Porta-Screen®.frame.
(4). Remove. Mounting. Screws. (56). to. detach. Bearing.
Housing.Unit.
(5). Replace.with.new.Bearing.Housing.Assembly.
f.. Reassemble.in.reverse.order.
UNTIL YOU ARE
®
6
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