5
• Operating Pressure - Check operating pressure to see if it within 10% of units specified
operating pressure. If pressure drops over time it may indicate general wear and tear and a
service is recommended.
• Air Leaks - Especially in suction to pump hoses. Repair immediately if found. Check for
cuts & abrasions
• Lance & Gun assemblies - Check for damage and leaks
• Filters - Check to ensure filters are clean, filter heads/tops are not cracked, seals are not
worn and sealed air tight and mesh tube is unblocked
• Motor Speed - Check unit if motor speed is too low. If motor makes a humming sound,
switch off immediately. Do not use extension cords on these units – plug straight into wall
socket!
• SAFETY Ensure safety protective gear is used and in good state of repair. Ensure Safety
MEDIC ALERT Card is handy.
• Prolonged by-pass - Leaving the unit in prolonged by-pass (machine is switched on but
trigger is not depressed) can cause excess wear & tear due to water over-heating which
damages seals. Portable units have a safety mechanisms built in to prevent damage:
o Automatic dumping of hot water when water temp rises above 63 deg C.
• Worn By-Pass Valves - Soft-Acting By-Pass valves should NOT store high pressure water
in hose down-stream between by-pass valve and high pressure gun.
• Water Leaks - Excessive hammering can cause damage. Fix leaks when they occur
• Water Condition - Ensure water source is clean (potable water). Not recycled water or
bore water which can damage pumps.
• Tyre Pressure – Trailer mounted units only
• Mechanical Brake System – Check all bolts and nuts – tighten if neccesary
Remember to check filters regularly and clean under running water.
The correct procedure for replacing the filter mesh in the small black filters (vs the large grey
filters) is to first put the mesh into the cup after rinsing under running water and then screw it
back onto the filter head. This is the opposite of replacing the filter mesh in the large filters.
Correct procedure of replacing LARGE filter
cartridges on large grey filters:
• Always put the filter mesh tube into the
black ‘head’ first (the part mounted on
the frame) ensuring it is square and tight.
• Now screw on the grey cup part of the filter.
Doing it the opposite way may result in a crushing
of the filter mesh!
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