Page 6-10 MAXX 450D/470D/Diesel
HydraMaster Corporation10/24/02
3.0. PSI gauge reads normal; low pressure from wand
3.1. There is a restriction in the cleaning tool. Inspect tool jet and clean or replace as
necessary. Inspect any filters in the cleaning tool and clean or replace as necessary.
3.2. There is a defective quick connect in the system. Inspect each quick connect and
replace as necessary.
3.3. There is a restriction in one of the solution hoses. Remove quick connects and
inspect hoses. Clean or replace as necessary.
3.4. There are hard water deposits restricting the system between the afterburner heat
exchanger and the high-pressure solution connection at the front of the machine.
Descale the machine. If this doesn’t solve the problem, disassemble this portion of the
system and locate restriction.
4.0. Pressure pulsation
4.1. Water in the water-box is too hot and is approaching boiling point. Check
temperature of water in the water-box. If it is too high, refer to Heating System section IV.
4.2. There is an air leak between the water box outlet and the pump inlet. Physically
check all hoses and fittings for cuts, breaks, cracks or tightness. Repair as necessary.
4.3. One of the intake or outlet valves in the high-pressure pump is defective or is
being held open by debris. Remove each valve and inspect for correct operation.
5.0. Water box empty or fills slowly
5.1. There is a restriction in the water supply system. Inspect the supply system from the
source through the incoming quick connect for kinks, clogs or restricted filters. Clean or
repair as necessary.
5.2. The float valve in the water box is defective. If there is adequate water flow to the
incoming valve in the water box, disassemble and inspect the valve. Repair or replace as
necessary.
6.0. Water box overflows
6.1. There is either debris caught in the valve or the valve seal is bad. Disassemble
valve and repair or replace as necessary.
6.2. The float has absorbed water and has lost buoyancy. Detach float and check to see if
it will float to the surface. Replace as necessary.
6.3. The float has come out of adjustment. Readjust float as necessary.
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