4-13: Machine Maintenance
PUMP TUNING INSTRUCTIONS
Pump tuning for the CTS 403 Flex allows the pump pressure switch to turn o when there
is no ow out of the tool. This reduces the pump operating temperatures and increases
the pump durability.
Pump tuning should be performed every 60 days.
The pump pressure setting adjustment is performed by turning the hex screw, which is
close to the center of the pump head, with a hex L-key, provided in the Flex Installation
Kit - (see Figure 4-4).
• Clockwise increases the pressure
• Counterclockwise decreases the pressure.
Tools required include:
• 1/16” hex L-key (one is provided with each pump for your convenience in
Installation Kit, P/N 000-078-934).
• Solution hose
• Cleaning tool (upholstery tool/ wand/ rotary cleaning tool) to allow solution to
ow out
• Container to collect solution owing out of the tool.
CLOCKWISE INCREASES PRESSURECLOCKWISE INCREASES PRESSURE
COUNTERCLOCKWISE COUNTERCLOCKWISE
DECREASES PRESSUREDECREASES PRESSURE
Figure 4-4. Location of Pump’s Hex Screw
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