VMAC - Vehicle Mounted Air Compressors
VMAC Technical Support: 888-241-2289
VMAC Knowledge Base: kb.vmacair.com
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The VMAC digital throttle is a “slow ramp” throttle. Each time the
system is powered on, it will quickly increase engine speed to 1,500
rpm; then increase to maximum VMAC rpm over 8 seconds (provided
the system has not reached full system pressure before maximum
VMAC rpm is reached).
After the initial slow ramp, the throttle will respond normally to air
demand
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When the VMAC system is first engaged, the engine speed should increase to
1,500 rpm and then drop down to VMAC base idle (approximately 1,250 rpm)
once system pressure is reached.
With the system running, check for*:
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*Coolant leaks.
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*Compressor oil leaks.
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*Hydraulic system leaks.
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*Check the hydraulic fluid level.
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Allow the compressor to run until the system reaches full system pressure.
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Engine speed should reduce to between 1,200 rpm to 1,300 rpm.
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Verify that the vehicle coolant level is correct.
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Perform a final inspection of the installation to ensure everything has been
completed.
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Check all wiring for security and protection. Ensure nothing is touching the
compressor body.
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Install the VMAC Air Test Tool (P/N: A700052) with the ball valve closed.
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Ensure all of the compressor outlets are closed.
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Ensure the parking brake is engaged and the transmission is in “PARK”.
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Start the engine.
After Starting the Engine Checklist
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Check for any leaks, confirm belt alignment, and ensure the belts are rotating
properly.
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Close and latch the hood.
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Allow the vehicle to run for a minimum of 30 seconds.
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Toggle the PTO selector to “VARIABLE RPM” and turn on the compressor.
Ensure all hydraulic equipment is shut down prior to proceeding. As
the hydraulic priority valve has not been adjusted, the next steps
have the potential to produce hydraulic flow that exceeds what the
equipment was designed for.