
Page Number - 6
CENTRO-MATIC®
4.1A-68010-B99 Form 402883
7. Besure thatall wiresare connectedtothecorrectlocationson
theterminalstrips.
8. Connecttheribboncableplugfromthekeypad(6)tothemating
plugonthetimer/controllerboard(4). Theplugshouldbeplugged
intothetimer/controllerboardsothattheribboncablehasno
twistinit; it must beparallelto the face of theenclosurewhen the
keypadisinstalled.
9. Whenreinstallingthekeypad(6),besurethattheribboncableis
gentlyfoldedintotheenclosurebehindthekeypad,andnot
pinchedbetweenthekeypadandenclosure.
Solenoid Valve Replacement
(See Illustration 3)
Warning!Electicalshockhazard. Disconnectand
lockoutallpowertothepumpunitbeforeremoving
thekeypadofthetimercompartment.
(Note:Replacementofthesolenoidvalvedoesnotrequireremovalof
thepumpassemblyfromthemountingsurface)
1. Turnofftheairandpowersupply topumpassembly.
2. SeeTimer/ControllerReplacement,above,toremovethekeypad
(6)andtimer/controllerboard(4).
3. Disconnectairlinefrompumpassembly. Removeanymuffleror
connectionsfromtheexhaustport.
4. RemovetheenclosurebyremovingtwoPhillipsheadscrews(2)
fromthebottomsideoftheenclosure(1).
5. Astheenclosureisremovedfromtheassembly,gentlypullthe
solenoidandgreengroundwiresthroughthegrommet(3)inthe
enclosurebacktowardsthesolenoidvalve.
6. Removethesolenoidvalve(14)usinga3/32allenwrenchto
removethetwo cap screws(15)holding it tothebottom of the air
cylinder(11). Donotlosethegasket(13)thatisplacedbetween
thevalveandaircylinder(11).
7. Whenreplacingthesolenoidvalve,makesurethesolenoidvalveis
thecorrectpartnumberandvoltageasthevalvetobereplaced.
8. Reassembleinreverseoftheaboveprocedure. Takecareinpulling
thesolenoidandgreengroundwiresthroughthegrommet(3).
Oil Reservoir Service
(See Illustrations 3, 6 & 7)
(Note: Replacementofthereservoirtubedoesnotrequireremovalof
thepumpassemblyfromthemountingsurface)
1. Turnofftheairsupplytothepumpassembly.
2. Turnoff thepower supplytothepumpunit.
3. Removelubricantfromthelubricantreservoir. Oilpumpreservoirs
maybedrainedbyremovingthedrainplug(8)fromthefrontofthe
pumpunitwith a 9/16 wrench.
4. Cleanoffreservoirtubeandareaaround reservoirtoprevent
gettingdirtintothelubricationsystem.
Warning! Failuretodrainreservoirwillresultin
lubricantleakageout ofreservoirwhenthenut(46)
securingthereservoirinplaceisremoved.
5. Disconnectsupplylinefrompumpoutlet.
6. Removenut(46)fromthetopof thereservoircap(44)usinga
1-3/8 wrench.
7. Removereservoircapfromtopofreservoir.
8. Slidethereservoirtubeoffthepumpoverthecenterpost.
9. Removegasket(35)ifnecessary.
10.Reassembleinreverseoftheaboveprocedure.
11.Tightennut(46)to10to15ft.-lbs.[1.4to2.1kg-m].
Grease Reservoir Service
(See Illustrations 3, 8 & 9)
(Note: Replacementofthereservoirtubedoesnotrequireremovalof
thepumpassemblyfromthemountingsurface)
1. Turnofftheairsupplytothepumpassembly.
2. Turnoff thepower supplytothepumpunit.
3. Removelubricantfromthelubricantreservoir.Greasepumps
maybeemptiedbycarefullyremovingthefillerfitting(7)from
theunitwitha 7/8 wrench. (Depending on how full the reservoir
is, the grease may flow out of the reservoir very rapidly.)
Warning! Failuretoremovealllubricantfrom
reservoircould resultin ahigh springforcefromthe
reservoirspring(43)and/orarapiddischargeof
greasewhennut(46)isloosenedorremoved.
4. Cleanoffreservoirtubeandareaaround reservoirtoprevent
gettingdirtintothelubricationsystem.
5. Disconnectsupplylinefrompumpoutlet.
6. Removenut(46)fromtoporreservoircap(44)usinga1-3/8
wrench. Carefullyholdreservoircap(44)againstany residual
springforcewhileremovingnut (46).
7. Removereservoircap(44)fromtopofreservoir.
8. Holding the follower down with the follower spring (43), carefully
work the reservoir off of the follower, leaving the follower and
springinplaceonthepumpassembly.
9. Removefollowerspring(43).
10. Removefollowerassemblybyslidinguptothethreadsinthe
centertube,andthenthreadingthefollowerassemblycounter-
clock-wiseoverthethreadedportionofthecentertube. Donot
force or pull the follower off of the center tube or damage will
resultto theo-ring(38 or48)inside offollowerbushing (39).
11. Removegasket(35)ifnecessary.
12. Disassemblethefollowerassemblybyremovingretainingring
(42),usingexternalretainingringpliers,frombushing(39).
Washers(40) andfollowerpacking cannow beremoved
frombushing(39). Removeo-ring(38or48)fromtheInternal
grooveintheinnerholeofthebushing(39);useapointedtool,
suchasapicktoremove.
13. Reassembleinreverseoftheaboveprocedurewiththefollowing
hints:
14. Wheninstallingthefollowerassemblyontothecentertube,
lubricatethecentertubeliberallywithgrease. Lubricatethe
o-ring(38 or 48)and the insideof bushing (39)with grease.
Thread,turning clockwise,thefollower assemblydown overthe
centerrodthreads. Donotforce ordrivewithhammer,or o-ring
damagewillresultinleakageoflubricantaroundfollower. Side
thefollower assemblydown tothe bottomof thetube.
15. Wheninstallingthereservoirtube,lubricatethefollower packing
lips(41) andtheinside ofthereservoir tube(36)with grease.
The reservoir tube will have two vent holes in the side wall of
the tubeclose toone endofthetube. Thereservoirtube(36)
mustbeplacedonthepumpwiththeventholesneartheupper