SUSPENSION
SUSPENSION
SettingRideHeight
Vehiclesequippedwithrearair
suspensionshavetheirrideheightand
axle(pinion)angle(s)presetatthe
factory.Theseareprecisionsettings
andshouldnotbealtered.Incorrectly
adjustedrideheightmayresultin
improperinteraxleU-jointworking
angles.Thiscanresultinpre-mature
drivelinewearanddrivelinevibration.
Ifyourvehicleisequippedwitha
Peterbiltrearairsuspension,andifit
becomesnecessarytoresettheride
height,youmaytemporarilysetitby
followingthenextprocedure.Proper
rideheightmeasurementandvalues
forafullyladenvehicleareshownin
theillustrationandtablebelow.
RideHeightMeasurement(Location
forTandemAxlesShown)
FullyLadenVehicle
Proprietary
Rear
RideHeight,
inches(mm)
Air
Suspension
SingleDrive
Tandem
Drive
AirLeafN/A11.70(297)
AirTrac
11.00(279)11.00(279)
LowAirLeaf6.50(165)8.50(216)
LowLowAir
Leaf
N/A6.50(165)
FLEXAir
N/A8.50(216)
UnladenVehicle
Proprietary
Rear
RideHeight,
inches(mm)
Air
Suspension
SingleDrive
Tandem
Drive
AirLeafN/A12.0(305)
AirTrac
11.38(289)11.38(289)
LowAirLeaf
(BeforeApril
2004)
8.75(222)8.75(222)
LowAirLeaf
(AfterApril
2004)
6.75(171)8.75(222)
LowLowAir
Leaf
N/A6.75(171)
FLEXAir
N/A8.75(222)
Followthisproceduretotemporarily
setrideheight.
WARNING
Ensurethatavehicleisparked
andthewheelschockedbefore
beginningthisprocedure.
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