
OurwheelsshipoutinScotchTension.WhenusingyourSparrowin
Scotchtension,themotorwillbefacingforwardandthepinionpulley
willhavejustenoughspacebetweenitandthefrontframetoslipthe
rubberdrivebeltinfrontofit.Viewingfromthesidewillverifythat
thedrivebeltisparalleltotheadjacentfrontframe.
Thetensionbeltislikelyalreadyinplace,buthumiditychangescan
drascallyaectthelengthoftherattail(akathetensionbelt).The
goalistohavetheRightTensionDial(1)adjustedintothemiddleofits
adjustmentrange,withnoslackinthetensionbeltandnoexpansion
Scotch Tension Basics
2
pulleyareproperlyaligneddirectlyunderneaththeappropriatewhorl,
becauseitmayhaveshiedalileduringshipping.
Todoso,checkthepinionpulley(thegroovethatholdsyourdrive
band)onthefrontofthemotor.Itshouldbelocateddirectlybelow
thebeltgrooveontheyerabove.Verifythatthedrivebeltisparallel
tothefrontframebyobservingitfromtheside.Useyourthumbs
toadjusttheposionofthemotormountasnecessary.Ifthemotor
mountfeelstooghttomove,pushonesidedownwardunlitpops
othecarbontube.