Growler Air compressors

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Wisky291

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Calif
What does the air compressor in the very back do? It never comes on.. But everything works... It has to do something..
 

W427

Member
46
14
8
Location
Seattle, WA area
It provides approximately 80 to 100 psig of air pressure from its tank for 1) Central Tire Inflation System (CTIS), 2) suspension air bladders (air bags), and 3) a quick-disconnect air fitting for general compressed-air use. If the compressor system is functioning and the controllers are working properly, it allows you to adjust equalized tire pressure on-the-fly or run-flat mode, and ride height to three preset positions. I would suggest getting the TM 1320-OR/B Operator's Manual for a full description of function and operation. Available service supplements and videos also outline service and maintenance.
 

Wisky291

New member
23
0
1
Location
Calif
It provides approximately 80 to 100 psig of air pressure from its tank for 1) Central Tire Inflation System (CTIS), 2) suspension air bladders (air bags), and 3) a quick-disconnect air fitting for general compressed-air use. If the compressor system is functioning and the controllers are working properly, it allows you to adjust equalized tire pressure on-the-fly or run-flat mode, and ride height to three preset positions. I would suggest getting the TM 1320-OR/B Operator's Manual for a full description of function and operation. Available service supplements and videos also outline service and maintenance.
Everything works great, but I never hear that compressor come on in the back , only the front.. Thank you..
 

W427

Member
46
14
8
Location
Seattle, WA area
Everything works great, but I never hear that compressor come on in the back , only the front.. Thank you..
There is only one compressor. If you hear it run (you can't miss the loud piston pump), then it's hopefully pressurizing the air tank. The pressure switch is approximately 80 psi ON and 100 psi OFF. [EDIT] I am waiting for a reply from Wilspec for the specifications of the original pressure switch, and a new replacement part number if available.

Many/most of these ITVs have multiple leaks. You can pop a pressure gauge onto a QD fitting to test pressure on the labeled AIR disconnect (clean it first). Also, be sure to service your compressor and intake air filter, as many are falling apart (think intake ingestion) or caked with mud and crud so they can't breathe. Instructions for maintenance are in the TM. The POC in Yermo said some do not respond immediately, and jostling will get them "un-stuck", but that also means they need basic valve servicing (not complicated).
 
Last edited:

Wisky291

New member
23
0
1
Location
Calif
There is only one compressor. If you hear it run (you can't miss the loud piston pump), then it's hopefully pressurizing the air tank. The pressure switch is approximately 80 psi ON and 100 psi OFF.

Many/most of these ITVs have multiple leaks. You can pop a pressure gauge onto a QD fitting to test pressure on the labeled AIR disconnect (clean it first). Also, be sure to service your compressor and intake air filter, as many are falling apart (think intake ingestion) or caked with mud and crud so they can't breathe. Instructions for maintenance are in the TM. The POC in Yermo said some do not respond immediately, and jostling will get them "un-stuck", but that also means they need basic valve servicing (not complicated).
Thank you..
 
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