User's Manual

Repair
Reassembly Reassembly
Reassembly
Clean Clean
Clean
and and
and
Inspect Inspect
Inspect
All All
All
Parts Parts
Parts
NOTICE NOTICE
NOTICE
UseonlygenuineGracoreplacementparts.
Non-standardpartswillvoidyourwarrantyand
maydamageyourequipment.
•Discardallusedseals,gasketsandwornparts.
•Ensurethatallnewandexistingpartsareclean
andundamaged.
•Thoroughlycleanallpartswithacompatible
solventandinspectfordamageorwear.Replace
allgaskets,washers,wornpartsandhardwareas
necessary.
•Inspecttheinnerdiameterofthepumproller.Ifthe
surfacehasbeenworn,replacetheroller.
•Inspectthebearingsonthemotoroutputshaft(2).
Ifthebearingsareworn,replacetheshaft.
•Inspecttheshaftandbearingboreinthepump
housing(1).Ensureitisround,withoutgroovesor
othersignsofwear,andfreeofdirt,lings,orother
debris.Adirtyordamagedbearingborewillgreatly
reducethelifeofthebearings.
•Inspectallmetalpartsforsignsofwearorcracks.
Replaceallwornparts.
NOTICE NOTICE
NOTICE
Thepumphousingisaluminum.Tohelpprevent
galling,blowoutthethreadswithcompressedair
beforeinstallinganyttingsorfasteners.
Install Install
Install
the the
the
Motor Motor
Motor
Output Output
Output
Shaft Shaft
Shaft
1.Inspectthebearingsandmakesurethatallrotate
freelyandareseatedagainsttheshoulderofthe
shaft(2).SeeFig7.
2.Coattheouterracesoftheshaftbearingsand
theinnerdiameterofthebearingborewithlight
lubricatingoil.Makesurethereisnodirtordebris
oneitherthebearingsorthebearingbore.
3.Inserttheshaft(2)intothepumphousing(1)from
thefront,makingsurethatthebearingsengage
thebearingboreushandstraight.Taptheroller
endoftheshaftwitharubbermalletuntilthe
shaftisrmlyseatedinthepumphousing.
NOTICE NOTICE
NOTICE
Donotforcetheshaftandbearingsintothe
pumphousing.Thismaycausedamagetothe
bearingsorthehousing.
4.Installthebearingretainingring(3)infrontofthe
outerbearing.
Install Install
Install
the the
the
Seals Seals
Seals
1.Pressanewinneru-cupseal(5)ontothegearbox
endoftheshaft(2)andintotheboreattherear
ofthepumphousing(1).Thelipsoftheu-cup
mustfaceintothepumphousing.SeeFig7.
2.GreasethepumpwithNLGI#2typegrease.
Removetheplug(18)fromthepumphousing
andreplacewithazerktting.Addgreaseuntil
itpassesthroughtheouterbearingoftheshaft.
Thisprovidesavisualreferenceoftheproper
amountofgrease.Donotover-grease.Remove
thezerkttingandreinstalltheplug(18).
3.Pressanewouteru-cupseal(4)ontothepump
endoftheshaft(2)andintotheboreatthefront
ofthepumphousing(1).Thelipsoftheu-cup
mustfacetowardtheshaftbearings.
4.Makesurethattheshaftrotatessmoothly.
12
3A1939G