HydraMaster CDS 4.6, Owner'S Manual, Page: 120 / 126

10-7: Machine Maintenance
Troubleshooting
HEATINg SYSTEM
1.0. Vehicle overheats and shuts off CDS
Refer to vehicle dealer for diagnosis and repair.
2.0. Vehicle overheats
2.1. faulty thermostat in
vehicle.
Refer to dealer
2.2. faulty water pump on
vehicle
Refer to dealer
2.3. faulty radiator (plugged)
limited water flow
Refer to dealer
2.4. faulty fan clutch, limited
air-flow.
Refer to dealer
3.0. Unable to achieve normal cleaning temperature
3.1.There is hard water or
chemical build-up in the heat
exchangers.
This will not allow the heat to transfer properly. Descale
and flush as necessary.
3.2. Cleaning solution flow is
too great.
Measure flow at tool.
3.2.1. The jet in the cleaning tool is too large or worn out.
Test the tool for water flow and replace or repair jet as
necessary.
3.2.2. Cleaning solution pressure is too high. Adjust
pressure to normal. Inspect pressure gauge for accurate
reading.
3.3. The system thermal
valve is stuck open.
Remove recovery tank lid and check for premature flow
from thermal valve hose at tank. The machine must be
at or below normal operating temperature for this test.
Replace or repair as necessary.
3.4. The CDS is being
operated at too low rpm or
too low vacuum setting.
The system must be at full operating rpm and full vacuum
load to achieve full operating temperature. These values
must be set per manufacture’s specifications. Adjust
vacuum or rpm as necessary.