MAXX 450D/470D/Diesel Page 5-5
HydraMaster Corporation
10/24/02
Heating System
Troubleshooting
1.0. Machine overheats and shuts down
1.1. Poor ventilation in vehicle. All cargo area doors must be open for proper ventilation.
Roof vents are strongly recommended for machines that are operated in hot climates.
Any item that might restrict air flow to the machine such as other equipment or a solid
divider between cargo and passenger areas should be moved or modified to permit proper
air flow.
1.2. One or both orifices or filter screens are restricted. Remove and inspect. Clean as
necessary. Note: Make sure orifices are not interchanged.
1.3. High-pressure dump solenoid is restricted. Inspect solenoid and the hose that
delivers water to it. Clean or replace as necessary.
1.4. Diverter valve is stuck or is out of adjustment. Operate diverter valve manually (make
sure exhaust system is cool) to determine if the movement of the valve is restricted.
Repair or adjust as necessary.
1.5. Diverter valve and/or high-pressure dump solenoid are not functioning. Check the
fuses that provide power to the temperature controller.
1.5.1. If a fuse is blown, inspect electrical system for damaged wiring. Repair or replace as
necessary.
1.5.2. If fuse is good, refer to qualified service technician to inspect temperature controller and
RTD sensor.
1.6. Engine RPM is too high. Check RPM with accurate tachometer and adjust as
necessary to 3000 RPM. Note: This should be done by a qualified service technician.
2.0. Unable to achieve normal cleaning solution temperature
2.1. System is in Divert mode or temperature control knob is turned down. Inspect
divert switch and temperature control. Change or adjust.
2.2. Diverter valve is stuck or is out of adjustment. Operate diverter valve manually (make
sure exhaust system is cool) to determine if the movement of the valve is restricted.
Repair or adjust as necessary.
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