operators_manual
Table Of Contents
SUSPENSION
SUSPENSION
SettingRideHeight
Vehiclesequippedwithrearair
suspensionshavetheirrideheightand
axle(pinion)angle(s)presetatthe
factory.Theseareprecisionsettings
andshouldnotbealtered.Incorrectly
adjustedrideheightmayresultin
improperinteraxleU-jointworking
angles.Thiscanresultinpremature
drivelinewearanddrivelinevibration.
Ifyourvehicleisequippedwitha
Peterbiltrearairsuspension,andifit
becomesnecessarytoresettheride
height,youmaytemporarilysetitby
followingthenextprocedure.Proper
rideheightmeasurementandvalues
forafullyladenvehicleareshownin
theillustrationandtablebelow.
RideHeightMeasurement(Location
forTandemAxlesShown)
FullyLadenVehicle
Propri-
etary
Rear
RideHeight,
inches(mm)
AirSus-
pension
Single
Drive
Tandem
Drive
AirLeafN/A11.70(297)
AirTrac
11.00(279)11.00(279)
LowAir
Leaf
6.50(165)8.50(216)
LowLow
AirLeaf
N/A6.50(165)
FLEXAir
N/A8.50(216)
UnladenVehicle
Propri-
etary
Rear
RideHeight,
inches(mm)
AirSus-
pension
Single
Drive
Tandem
Drive
AirLeafN/A12.0(305)
AirTrac
11.38(289)11.38(289)
LowAir
Leaf
(Before
April2004)
8.75(222)8.75(222)
LowAir
Leaf(After
April2004)
6.75(171)8.75(222)
LowLow
AirLeaf
N/A6.75(171)
FLEXAir
N/A8.75(222)
Followthisproceduretotemporarily
setrideheight.
(03/17)Y53-6060-1C14-57
4