Air-Actuated Main Hydraulic Valve - Labrie TOP SELECT Maintenance Manual

92 Air System Maintenance
DANGER!
Apply the Lockout/Tagout procedure at all times when maintenance and inspection are
performed on the vehicle.

Air-Actuated Main Hydraulic Valve

The main hydraulic valve, which controls the body functions, is activated by air actuators.
Figure 8-3 Air actuators
When the tailgate or body lever on the console is actuated, air pressure passing through the lever will
activate the corresponding air actuator on the main valve resulting in a movement of the hydraulic
spool inside the valve.
To avoid affecting control air systems on the vehicle (especially in cold weather conditions), apply
the following procedure:
1.
Ensure that the parking brake is applied.
2.
Drain all air tanks on a daily basis.
3.
Change the cartridge in the air dryer according to the chassis manufacturer's recommendations.
On this type of equipment, the compressor works all the time mostly due to the frequent use of
the brake system. As a result, a lot of moisture is injected into the air system.
4.
Twice a year, lubricate the air actuators on the main control valve with light oil (low
temperature).
N : For vehicle equipped with an alcohol evaporator, please refer to the chassis manufacturer
OTE
dealer for proper maintenance instructions.