VMAC - Vehicle Mounted Air Compressors
VMAC Technical Support: 888-241-2289
VMAC Knowledge Base: kb.vmacair.com
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Ensure any stored air is drained from the system prior to adding oil.
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Add oil as necessary to bring the level to the “MAX” line in the sight glass and
check for leaks.
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Start the engine.
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Turn on the compressor and allow it to build to full system pressure.
Digital Throttle Auto Calibration
Hydraulic Priority Valve Adjustment and Flow Testing
☐
Install a hydraulic flowmeter between the regulated flow port on the priority
valve, and the crane.
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Start the engine.
☐
Set the PTO mode selector switch on the PTO indicator panel to “FIXED RPM”.
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Turn on the compressor. The engine speed should increase to 1,250 rpm.
☐
Remove the cover cap (Figure 52).
Figure 52 — Adjust priority valve
Clockwise to
reduce flow
Counterclockwise to
increase flow
Locknut
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Turn off the compressor.
☐
Shutdown the engine.
☐
Check the compressor oil level after the engine has been shut down and the oil
level has had time to stabilize.
The VMAC digital throttle is equipped with an auto calibration and
engine learning routine that will assist with maintaining accurate
and stable engine speeds. No user input is required.
Operators may however notice that while the system is at full
system pressure and the vehicle is at base VMAC idle, the vehicle
engine speed may drop by a few hundred rpm and then return to
normal VMAC base idle as the VMAC digital throttle control auto
calibrates. This is normal and should only occur once each time the
system is being operated.
