SECTION 16: SUSPENSION
DOB 2490-2789 | X3-45 Commuter PA1605 Maintenance Manual (Section 16 revised April 2019)
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9.3 BELLOWS
CONTROL
SOLENOID
VALVES
9.3.1
Removal and installation
1. On the rear side of steering compartment,
locate both the bellows control and bellows
exhaust solenoid valves.
2. Identify hoses and wires to ease
reinstallation. Disconnect solenoid wires and
the three flexible black hoses from solenoid
valves.
3. Unscrew and remove the control solenoid
valve and exhaust solenoid valve assembly.
Place on a clean working place.
Reverse removal procedure to reinstall.
CAUTION
Any cable tie that has been cut during removal
procedure should be replaced with a new one.
10. TROUBLESHOOTING
Condition
Cause
Correction
Bellows deflate over time 1. Defective check valve assembly.
2. Defective exhaust valve
assembly.
3. Leak in air line and/or bellows.
4. Defective valve cover, rubber
O-rings or gasket.
1. Replace check valve
assembly.
2. Replace exhaust valve
assembly.
3. Replace air line or bellows.
4. Replace valve cover, O-rings
or gasket.
Bellows raise to full
height and fail to exhaust
air pressure
1. A clogged exhaust screen in
height control valve assembly.
2. A combination clogged exhaust
screen and defective air inlet
valve assembly.
1. Remove and clean screen.
2. Clean exhaust screen and
replace air inlet valve
assembly.
Erratic valve action
1. Dirt or foreign matter in the air
valve lever chamber.
2. Defectives
valves.
1. Remove valve cover and blow
out dirt. Install cover using new
gasket.
2. Overhaul height control valve
assembly
Vehicle body fails to
level to satisfactory ride
height
1. Improper height control valve
overtravel lever adjustment
Adjust lever as directed.
