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SECTION 16 : SUSPENSION
4.11 FRONT-END ALIGNMENT ............................................................................................................................. 32
4.12 LOWER AND UPPER A-ARM BALL PIN BUSHING REPAIR .............................................................................. 36
4.12.1 Inspection ............................................................................................................................................. 36
4.12.2 Stripping Down .................................................................................................................................... 36
4.12.3 Assembly .............................................................................................................................................. 36
4.13 LOWER A-ARM BALL JOINT REPAIR .............................................................................................................. 37
4.13.1 Stripping Down .................................................................................................................................... 37
4.13.2 Assembly .............................................................................................................................................. 37
4.14 UPPER A-ARM BALL JOINT ........................................................................................................................... 37
4.14.1 Visual Inspection .................................................................................................................................. 37
4.14.2 Play Measurement ............................................................................................................................... 37
4.15 FRONT AIR SPRINGS ..................................................................................................................................... 38
4.15.1 Inspection ............................................................................................................................................. 38
4.15.2 Removal ............................................................................................................................................... 38
4.15.3 Installation ........................................................................................................................................... 39
4.16 SHOCK ABSORBERS ...................................................................................................................................... 39
4.16.1 Shock Absorber Removal ..................................................................................................................... 39
4.16.2 Shock Absorber Installation ................................................................................................................. 40
4.17 SWAY BAR .................................................................................................................................................... 40
4.17.1 Removal ............................................................................................................................................... 40
4.17.2 Installation ........................................................................................................................................... 41
5 REAR SUSPENSION ....................................................................................................................................... 42
5.1 AIR SPRINGS ................................................................................................................................................. 43
5.1.1 Inspection ............................................................................................................................................. 43
5.1.2 Removal ............................................................................................................................................... 43
5.1.3 Installation ........................................................................................................................................... 43
5.2 SHOCK ABSORBERS ...................................................................................................................................... 44
5.2.1 Inspection ............................................................................................................................................. 44
5.2.2 Removal ............................................................................................................................................... 45
5.2.3 Installation ........................................................................................................................................... 45
5.3 RADIUS RODS ............................................................................................................................................... 45
6 SUSPENSION AIR SYSTEM ............................................................................................................................. 46
6.1 INSPECTION.................................................................................................................................................. 46
6.2 AIR LINE TEST ............................................................................................................................................... 46
7 SUSPENSION HEIGHT ADJUSTMENT.............................................................................................................. 46
7.1 NORMAL RIDE HEIGHT ................................................................................................................................. 46
7.2 HEIGHT CONTROL VALVES ........................................................................................................................... 47
7.3 MAINTENANCE............................................................................................................................................. 47
7.3.1 Removal and installation ..................................................................................................................... 47
7.3.2 Air leakage test .................................................................................................................................... 49
8 "LEVEL-LOW" LEVELING SYSTEM - VIP SERIES OPTION ONLY ........................................................................ 49
8.1 PRINCIPLES OF OPERATION ......................................................................................................................... 49
8.2 MAINTENANCE............................................................................................................................................. 49
9 FRONT KNEELING SYSTEM (COACHES ONLY)................................................................................................. 50
9.1 PRINCIPLE OF OPERATION ........................................................................................................................... 50
9.2 MAINTENANCE............................................................................................................................................. 50
9.3 AIR SPRING CONTROL SOLENOID VALVES.................................................................................................... 50
9.3.1 Removal and installation ..................................................................................................................... 50
2 PA1621 Maintenance Manual All Series | Section revised October 2018