Vmac UNDERHOOD 40 Series Owner's Manual page 29

Inspecting and Replacing the Blowdown Muffler
Read the "Maintenance and Repair Safety" section prior to
performing any work on the system (beginning on page 23).
Wear appropriate Personal Protective Equipment and follow all
industry standard safety practices.
The Blowdown Muffler (or remote blowdown muffler) is a regular service item and
must be replaced every 400 hours or 1 year, whichever interval occurs first.
Visually inspect the blowdown muffler for evidence of corrosion or loss of
functionality. Ensure the muffler allows the system to depressurize. To test the
blowdown system and muffler:
☐
Turn the system on and allow it reach full system pressure (factory setting
150 psi).
☐
Turn the switch on the interface panel to "OFF".
☐
Listen for the pressurized air to blowdown through the muffler on the WHASP
Tank. Blowdown should be completed in approximately 20 seconds.
☐
If the muffler is showing signs of blockage, contact a local VMAC dealer for a
replacement.
A replacement blowdown muffler is included with the VMAC 400
hour service kit.
VMAC - Vehicle Mounted Air Compressors
VMAC Technical Support: 888-241-2289
VMAC Knowledge Base: kb.vmacair.com
Figure 16 — Blowdown muffler
Blowdown
muffler
27