MG MG6 Series 2011 - Description

SteeringSystem
FrontWheelSteering
Description
General
Themajorsteeringcomponentscompriseatwostage
collapsiblesteeringcolumn,apowerassistedsteeringrack,a
pump,apressuresensor,auidreservoir,auidcoolerand
uidpipesandhoses.
SteeringRack
Thesteeringrackismountedintheoptimumposition,low
ontherearcrossmemberofthefrontsubframe.Astherack
mountingpointsandsuspensionpivotpointsarealldened
bytheaccuraterigidsubframe,thedesignedgeometric
relationshipsaremaintainedatalltimes.Therackisretained
withtwoboltsthroughcastlugsnearthevalveunitandtwo
boltswhichsecureaclampxedtotheoppositeendofthe
rack.A'DoubleD'arrangementtogetherwithanutand
camboltsecuresthesteeringcolumntothesteeringrack
pinion.Therackrequires2.81turnsfromlocktolockandthe
rackandpinionhasanoverallratioof16:1.Rubbergaiters
protectthemovementareaoftherack.T rackrodends,tted
tothreadedtierodsandsecuredwithlocknutsprovidefor
theadjustmentoffrontwheelsteeringalignment.Eachtrack
rodendissecuredbyalocknuttothesteeringarm,which
extendsfromthefronthub.
ValveUnit
1.Inputshaft
2.T orsionbar
3.Circlip
4.Oilseal
5.Valvehousing
6.PTFEring(4off)
7.Outersleeve
8.Pinionshaft
9.Bearing
10.Oilseal
11.Nut
12.Bearing
13.Pin-pinionshafttotorsionbar
14.Pin-rotortotorsionbar
Thevalveunitisanintegralpartofthesteeringrack.The
principalfunctionofthevalveunitistoprovidemaximum
powerassistance(i.e.;whenparking)withminimumeffort
requiredtoturnthesteeringwheel.
Thecastoutercasingofthevalveunithasfourportswhich
providetheconnectionsforpressurefeedfromthepump,
returntotheuidreservoirandpressurefeedfromthevalve
unittotheannulusandfullareaofthecylinder.Anonreturn
valveandsealisttedinthepressurefeedportfromthePAS
pump.
Thevalveunitcomprisesanoutersleeve,rotor,torsionbar
andapinionshaft.Thevalveunitiscoaxialwiththepinionshaft
whichisconnectedtothesteeringcolumnviatheinputshaft.
Thevalveunitcomponentsarelocatedinahousingwhichis
screwedtoamatingcastingonthesteeringrackmainbody
andsecuredwithscrews.
Version2.0518