Troubleshooting - MAXIMATOR VP30 Maintenance Information

VP30/VP500
MAINTENANCE INFORMATION
Starting compressor after Maintenance
Turn the compressor by hand for a few revolutions. Check that the motion is smooth and free.
Re-check all screws and connections for tightness.
Run the compressor for 10 - 15 minutes until warm.
Re-check all screws and connections for tightness.
General maintenance notes
Delivery valves will wear out before suction valves, due to the higher temperatures.
When replacing piston rings, ALWAYS replace as a complete set for each stage (i.e. do not mix old
and new rings in the same cylinder)
Always lubricate components (not paper gaskets) on assembly with clean lubricating oil.
Make sure that cylinders and cylinder head components are extremely clean on assembly. Any
particles of dirt left inside can score the cylinder bores and reduce the performance of the
compressor valves.

Troubleshooting

Low output flow or pressure
Leakage
If gas is leaking from the compressor cylinders or coolers, the output flowrate will fall, resulting in
low pressure. Carry out leakage test.
1st stage cylinder head
If the 1st stage cylinder head gasket is leaking, or the valve plate gasket is damaged, the flowrate
will fall. Check that the gaskets 5/9 and 5/11 are correctly fitted, and in good condition.
Unloader system
If the unloader valves do not seat correctly, gas from the compressor will vent through the unloader
vent when the compressor is running. With the compressor running, check that
no gas is venting through the unloader vent. If there is gas venting when the
compressor is running, carry out the unloader inspection and replace any worn
components.
Worn piston rings
Worn piston rings will reduce the output capacity of the compressor. Replace the
piston rings.
Piston rings marked 'TOP' or with a coloured dot, must be installed with the
'TOP'/ dot marks facing the top of the piston.
Illustration is used to show orientation marks on piston rings only.
IMPORTANT:
Piston ring gaps must be rotated through 90 or 120 degrees from each other.
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