PREVOST H3-41 Maintenance Manual page 592

SECTION 16 : SUSPENSION
Air springs raise to full
height and fail to exhaust
air pressure
Erratic valve action
Vehicle body fails to level to
satisfactory ride height
56 PA1621 Maintenance Manual All Series | Section revised October 2018
1. A clogged exhaust screen in height
control valve assembly.
2. A combination clogged exhaust
screen and defective air inlet valve
assembly.
1. Dirt or foreign matter in the air valve
lever chamber.
2. Defectives valves.
1. Improper height control valve control
arm adjustment
1. Remove and clean screen.
2. Clean exhaust screen and replace
air inlet valve assembly.
1. Remove valve cover and blow out
dirt. Install cover using new gasket.
2. Overhaul height control valve
assembly
1. Adjust lever as directed.