Operator's Manual

Usethefollowingcharttodeterminewhich
bedknifeisbestsuitedforthedesiredheightofcut.
Bedknife/HeightofCutChart
Bedknife
PartNo.
Bedknife
LipHeight
*
HeightofCut
LowHOC
(Optional)
120–1641
(27inch)
120–1642
(32inch)
.220inch
(5.6mm)
.250-.500inch
(6.4–12.7mm)
EdgeMax®
(Optional)
112-8910
(27inch)
112–8956
(32inch)
.270inch
(6.9mm)
.375-2.50inches*
(9.5–63.5mm)
Standard
(Production)
114–9388
(27inch)
114–9389
(32inch)
.270inch
(6.9mm)
.375-2.50inches*
(9.5–63.5mm)
HeavyDuty
(Optional)
114–9390
(27inch)
114–9391
(32inch)
.370inch
(9.3mm)
.500-2.50inches
(12.7-63.5mm)
Note:WarmseasongrassesmayrequiretheLow
HOCbedknifefor.500inches(12.7mm)andbelow.
Figure21
1.BedknifeLipHeight*
CuttingUnitCharacteristics
Thedualknobbedknife-to-reeladjustmentsystem
incorporatedinthiscuttingunitsimpliesthe
adjustmentprocedureneededtodeliveroptimum
mowingperformance.Thepreciseadjustment
possiblewiththedualknob/bedbardesigngivesthe
necessarycontroltoprovideacontinualself-sharpening
action-thusmaintainingsharpcuttingedges,ensuring
goodquality-of-cut,andgreatlyreducingtheneedfor
routinebacklapping.
DailyAdjustmentsofCuttingUnit
Priortomowingeachday,orasrequired,eachcutting
unitmustbecheckedtoverifyproperbedknife-to-reel
contact.Thismustbeperformedeventhough
qualityofcutisacceptable.
1.Lowerthecuttingunitsontoahardsurface,shutoff
theengine,andremovetheignitionkey.
2.Slowlyrotatethereelinareversedirection,listening
forreel-to-bedknifecontact.Ifnocontactisevident,
turnthebedknifeadjustingknobsclockwise,one
clickatatime,untillightcontactisfeltandheard.
Note:Thereelmustcutonesheetofpaper,when
insertedatarightangletothebedknife,atboth
endsandthecenterofthereel.
Note:Theadjustmentknobshavedetents
correspondingto0.0009in.(0.023mm)bedknife
movementforeachindexedposition.
3.Ifexcessivecontactisneededtocutpaper,
backlappingorgrindingisrequired.
Important:Lightcontactispreferredat
alltimes.Iflightcontactisnotmaintained,
thebedknife/reeledgeswillnotsufciently
self-sharpenanddullcuttingedgeswillresult
afteraperiodofoperation.Ifexcessivecontact
ismaintained,bedknife/reelwearwillbe
accelerated,unevenwearcanresult,andquality
ofcutmaybeadverselyaffected.
Note:Asthereelbladescontinuetorunagainst
thebedknife,aslightburrwillappearonthefront
cuttingedgesurfacealongthefulllengthofthe
bedknife.Ifaleisoccasionallyrunacrossthe
frontedgetoremovethisburr,improvedcutting
canbeobtained.
Afterextendedrunning,aridgewilleventually
developatbothendsofthebedknife.Thesenotches
mustberoundedofforledushwiththecutting
edgeofthebedknifetoensuresmoothoperation.
Note:Overtime,thechamfer(
Figure22)willneed
toberegroundasitisonlydesignedtolast40%
ofthebedknifelife.
Figure22
1.Lead-inchamferonrightendofbedknife
Note:Donotmakelead-inchamfertoolargeas
itmaycauseturftufting.
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