Toro 22470 - Replacing the Digging Teeth; Replacing the Drive Sprocket

ReplacingtheDiggingTeeth
ServiceInterval:Beforeeachuseordaily
Duetothehighamountofwearplacedonthedigging
teeth,youwillneedtoreplacethemperiodically.
Toreplaceasingletooth,removetheboltssecuringthe
toothtoremoveit,theninstallanewtoothinthesame
position.Torquetheboltssecuringtheteethto27to33
ft-lb(37to45N-m).
ReplacingtheDriveSprocket
Overtime,thedrivesprocketwillwear,especiallywhen
usedinsandyorclaysoils.Whenthishappens,the
diggingchainwillbegintoslip.Ifthechainslips,replace
thedrivesprocket,asfollows:
1.Raisethetrencherafewinchesabovetheground.
2.Stoptheengineandremovethekey.
3.Removethespoilsauger(Fig.8).
G008941
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Figure11
1.Spoilsauger
3.Bolts
2.Drivesprocket
4.Loosenthe2boltsandnutssecuringtheboomto
thetrencherarm(Fig.2).
5.Loosenthejamnutontheadjustingboltinthe
boom(Fig.2).
6.Loosentheadjustingboltuntilyoucanremovethe
chainfromtheboom(Fig.2).
7.Removethechainfromthedrivesprocket.
8.Removethe6boltssecuringthedrivesprocket(Fig.
8).
9.Removeanddiscardthedrivesprocket(Fig.8).
10.Cleanthesprocketmountingsurfaceonthetrencher.
11.Slidethenewsprocketontotheshaftasillustrated
inFigure8.
Important:Thearrowonthesprocketface
shouldbevisiblefromtherightsideofthe
trencherandshouldpointinaclockwise
direction;ifnot,turnthesprocketaround.
12.Threadthe6boltsintothesprocketngertight(Fig.
8).
13.Slowlybegintighteningtheboltsprogressingaround
thesprocketuntilallboltsaretorquedto95to115
ft-lb(129to155N-m).
Important:Tighteneachboltonlyhalfway
rst,workingyourwayaroundthesixbolts,
thenreturntoeachboltinturnandtorquethem
tothespecicationsgiveninstep13.
14.Loopthechainovertheaugerdriveshaftandonto
thedrivesprocket,ensuringthattheteethpoint
forwardontheupperspan.
15.Settheupperspanofthechainintoplaceonthe
trencherboom,thenwrapthechainaroundthe
rollerattheendoftheboom.
16.Threadtheadjustmentboltintotheboomandturn
itinuntilthereis1-1/2to2-1/2inches(3.8to6.3
cm)ofslackinthechainonthebottomspan.
17.Threadthejamnutdowntheadjustingboltand
tightenitsecurelyagainsttheboom.
18.Torquethe2boltsandnutssecuringtheboomto
135to165ft-lb(183to223N-m).
19.Installthespoilsauger;refertoInstallingtheSpoils
Auger.
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