Gilson's Porta-Screen
®
7
DO NOT PLUG IN THE PORTA-SCREEN
®
UNTIL YOU ARE
READY TO USE IT.
2..
Connecting Rod & Drive Shaft Bearings:
.The.Connect-
ing.Rod.(50).can.be.replaced.as.an.assembly,.or.you.can.
press.out.and.replace.its.Bearing.and.Bushing.(51,52).
The.Drive.Shaft.(20).has.front.and.rear.Bearings.(47)..We.
recommend. replacement. of. both. front. and. rear. bearings.
as.a.set.
a.. DISCONNECT.AND.LOCK.OUT.ELECTRIC.POWER.
b.. Remove.and.set.aside.trays.and.pan.
c.. Remove.Top.Frame.Screws.
d.. Lift.off.Top.Frame.Crossbar.
e.. Remove.all.case.covers.
f.. Remove.the.Connecting.Rod.Mounting.Bolt.
g.. Lift.the.entire.vibrating.unit.assembly.up.and.out.of.the.
Porta-Screen®.frame.
h.. Loosen.the.Motor.Mounting.Bolts.to.release.tension.on.
the. Drive. Belt,. and. remove. the. Drive. Belt. from. its. pul-
leys.
i.. Loosen.the.setscrew.in.the.Drive.Pulley.(21),.and.slide.
the.pulley.off.the.Drive.Shaft.
j.. Loosen.the.setscrew.in.the.Rear.Drive.Shaft.Bearing.
k.. Loosen. the. Idler. Bracket. Mounting. and. Adjusting.
Screws. (45,. 46). to. release. tension. on. the. Timing. Belt.
(16).
l.. Remove.the.Timing.Belt.
m..Loosen.the.setscrew.in.the.Drive.Shaft.Pulley.(49),.and.
slide.the.pulley.off.the.Drive.Shaft.
n.. Remove. the. mounting. screws. from. the. Front. Drive.
Shaft.Bearing.
o.. Hold.onto.the.top.of.the.Connecting.Rod.while.you.pull.
the.Drive.Shaft.out.from.the.front.of.the.machine.with.
the.front.Bearing.attached.
p.. Remove.the.Connecting.Rod.
q.. Install. new. Connecting. Rod. Assembly. or. press. new.
Bushing.and.Bearing.into.existing.Connecting.Rod.
r.. Replace.Drive.Shaft.bearings.if.needed.
s.. Continue.or.reassemble.in.reverse.order..When.replac-
ing. Timing. Belt,. refer. to. Section. 4.3. and. be. sure. that.
counterweights.are.aligned.properly.
DO NOT PLUG IN THE PORTA-SCREEN
®
UNTIL YOU ARE
READY TO USE IT.
3..
Counterweight Shaft Bearings:
Each. of. the. two. Coun-
terweight. Shafts. (12,13). has. a. Front. and. a. Rear. Bearing.
(41).. We. recommend. replacement. of. both. bearings. on.
a. shaft.. If. you. have. disassembled. the. Porta-Screen®. to.
replace.the.Connecting.Rod.and/or.Drive.Shaft.Bearings,.
skip.to.step.h..Otherwise,.disassemble.as.follows:
a.. DISCONNECT.AND.LOCK.OUT.ELECTRIC.POWER.
b.. Remove.and.set.aside.trays.and.pan.
c.. Remove.Top.Frame.Screws.
d.. Lift.off.Top.Frame.Crossbar.
e.. Remove.all.case.covers.
f.. Remove.the.Connecting.Rod.Mounting.Bolt.
g.. Lift.the.entire.vibrating.unit.assembly.up.and.out.of.the.
Porta-Screen®.frame.
h.. Loosen. the. Idler. Bracket. Mounting. and. Adjusting.
Screws.to.release.tension.on.the.Timing.Belt.
i.. Remove.the.Timing.Belt.
j.. Loosen. the. bolts. on. the. Rear. Counterweight. Clamp.
Bracket. (43),. and. remove. the. Counterweight. (14). from.
the.shaft.
k.. Loosen. the. setscrew. which. holds. the. Rear. Bearing. to.
the.Counterweight.Shaft.
l.. Remove.the.Mounting.Screws.(42).which.hold.the.Front.
Counterweight.Shaft.Bearing.to.the.main.frame.
m..Pull.the.Counterweight.Shaft.from.the.front.of.the.ma-
chine. with. its. Front. Counterweight,. Pulley,. and. Front.
Bearing.all.attached.
n.. Reinstall.parts.as.needed.
o.. Reassemble. in. reverse. order.. When. replacing. Timing.
Belt,.refer.to.Section.4.3.and.be.sure.that.the.counter-
weights.are.aligned.properly.
DO NOT PLUG IN THE PORTA-SCREEN
®
UNTIL YOU ARE
READY TO USE IT.
4..
Wire Cloth:
Check.condition.of.wire.cloth.both.before.and.
after.operation..Test.results.can.be.only.as.accurate.as.the.
size. of. wire. cloth. openings.. Always. replace. with. testing.
grade.wire.cloth.only.
.
Testing.grade.wire.cloth.is.a.precision-made.material.and.
should.be.treated.with.care..The.ASTM.E11.specification.
permits.only.very.slight.variations.in.average.opening.and.
wire. diameter.. Abrasion. due. to. normal. use. and/or. im-
proper.cleaning.and.handling.can.cause.the.wire.cloth.to.
be.out.of.specification.to.a.considerable.degree.before.it.
appears. worn.. Check. it. frequently. to. be. sure. that. it. con-
forms.to.your.test.specifications.
.
Wire. cloth. life. can. be. extended. by. establishing. proper.
procedures. for. handling,. cleaning,. and. storage. of. trays...
The. PSA-367. Porta. Sample. Pan. is. helpful. in. the. repeti-
tive.sequence.of.emptying.trays,.cleaning.wire.cloth,.and.
weighing.sample.fractions.
.
Wire. cloth. may. eventually. sag,. reducing. its. effective.
screening. area.. Wire. sizes. 2in–No.14. are. rigid. and. self-
supporting.. Trays. for. No.16–80. wire. cloth. contain. three.
wire. cloth. support. strips.. No.100. and. finer. trays. have.
supporting.backing.cloth.to.minimize.wear.and.distortion..
When.you.replace.No.16.and.finer.wire.cloth,.always.use.
support.strips.or.backing.cloth.as.indicated..
