29
Troubleshooting and Testing
EN
5.2.2.2
Turbo Cut-Off Valve (Pertains only to dryers equipped with turbo cut-off valves)
1.
Wear safe eye protection. Park the vehicle on a level surface. Block the wheels to prevent the vehicle
from moving. Set the parking brake.
2.
Pump the air system down by making brake applications until the system pressure gauge shows just
below cut-in pressure, typically 100 psi (6.89 bar).
3.
Start the vehicle.
4.
While the compressor is pumping, inspect for air coming out of the bottom of the air dryer.
If air is coming out of the bottom of the TCV or the governor exhaust vent, replace the TCV using the
procedure in this maintenance manual.
5.
If the TCV is not leaking, continue to run the engine until the compressor builds the system to cut-out
pressure, typically 130 psi (8.96 bar)
6.
When cut-out pressure is reached, verify that the air dryer purges. There will be a loud blast of air from
the purge valve followed by a gentle flow of air lasting about 30 seconds. After 30 seconds, all flow of air
from the purge valve should stop.
If air continues coming out of the bottom of the TCV, replace the TCV using the procedure in this
technical bulletin.
If the compressor and air dryer constantly cycle several times before cut-out pressure is reached,
replace the TCV using the procedure in this technical bulletin. If the compressor and the air dryer
continue to cycle frequently after you replace the TCV, replace the governor.
Summary of Contents for SYSTEM SAVER HP MM1736
Page 1: ...SYSTEM SAVER HP AIR DRYER MAINTENANCE MANUAL MM1736...
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