PA1621 Maintenance Manual All Series | January 2017
4.11 FRONT-END ALIGNMENT ............................................................................................................................. 31
4.11.1 Alignment Terminology ........................................................................................................................ 31
4.11.2 Front End Inspection ............................................................................................................................ 32
4.11.3 Front Wheel Camber ............................................................................................................................ 32
4.11.4 Front Wheel Toe-In .............................................................................................................................. 32
4.11.5 Front Wheel Caster .............................................................................................................................. 33
4.11.6 Major Damage ..................................................................................................................................... 33
4.11.7 Alignment Specifications ...................................................................................................................... 33
4.12 LOWER AND UPPER A-ARM BALL PIN BUSHING REPAIR .............................................................................. 38
4.12.1 Inspection ............................................................................................................................................. 38
4.12.2 Stripping Down .................................................................................................................................... 38
4.12.3 Assembly .............................................................................................................................................. 38
4.13 LOWER A-ARM BALL JOINT REPAIR .............................................................................................................. 39
4.13.1 Stripping Down .................................................................................................................................... 39
4.13.2 Assembly .............................................................................................................................................. 39
4.14 UPPER A-ARM BALL JOINT ........................................................................................................................... 39
4.14.1 Visual Inspection .................................................................................................................................. 39
4.14.2 Play Measurement ............................................................................................................................... 39
4.15 FRONT AIR SPRINGS ..................................................................................................................................... 40
4.15.1 Inspection ............................................................................................................................................. 40
4.15.2 Removal ............................................................................................................................................... 40
4.15.3 Installation ........................................................................................................................................... 41
4.16 SHOCK ABSORBERS ...................................................................................................................................... 41
4.16.1 Shock Absorber Removal ..................................................................................................................... 41
4.16.2 Shock Absorber Installation ................................................................................................................. 42
4.17 SWAY BAR .................................................................................................................................................... 42
4.17.1 Removal ............................................................................................................................................... 42
4.17.2 Installation ........................................................................................................................................... 42
5 REAR SUSPENSION ....................................................................................................................................... 43
5.1 AIR SPRINGS ................................................................................................................................................. 44
5.1.1 Inspection ............................................................................................................................................. 44
5.1.2 Removal ............................................................................................................................................... 44
5.1.3 Installation ........................................................................................................................................... 44
5.2 SHOCK ABSORBERS ...................................................................................................................................... 45
5.2.1 Inspection ............................................................................................................................................. 45
5.2.2 Removal ............................................................................................................................................... 46
5.2.3 Installation ........................................................................................................................................... 46
5.3 RADIUS RODS ............................................................................................................................................... 46
6 SUSPENSION AIR SYSTEM ............................................................................................................................. 46
6.1 INSPECTION.................................................................................................................................................. 47
6.2 AIR LINE TEST ............................................................................................................................................... 47
7 SUSPENSION HEIGHT ADJUSTMENT.............................................................................................................. 47
7.1 NORMAL RIDE HEIGHT ................................................................................................................................. 47
7.2 HEIGHT CONTROL VALVES ........................................................................................................................... 48
7.3 MAINTENANCE............................................................................................................................................. 48
7.3.1 Removal and installation ..................................................................................................................... 48
7.3.2 Air leakage test .................................................................................................................................... 49
8 "LEVEL-LOW" LEVELING SYSTEM – VIP SERIES OPTION ONLY ........................................................................ 49
8.1 PRINCIPLES OF OPERATION ......................................................................................................................... 49
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