HydraMaster Boxxer 423s - High Pressure System Troubleshooting

8-9: Systems Troubleshooting Systems Troubleshooting: 8-8
4.0 Pressure pulsation
Possible Cause Solution
4.1 Air leak between the water
box and pump.
Check all the hoses and ttings for cuts, breaks,
cracks, etc. Repair as necessary.
4.2 The check valve(s) in the
pump are faulty.
Remove each valve and inspect for correct
operation. See the Machine Maintenance Section.
5.0 Water box empty or lls slowly
Possible Cause Solution
5.1 Restriction in the water
supply system.
Inspect the supply system from the source through
the incoming quick connect.
5.2 The oat valve in the
water box is faulty.
Disassemble and inspect the valve. Repair or
replace as necessary.
6.0 The water box overows
Possible Cause Solution
6.1 The oat valve in the
water box is faulty.
Disassemble and inspect the valve. Repair or
replace as necessary.
6.2 The oat has absorbed
water and lost buoyancy.
Detach the oat and check to see if it will oat to the
surface. Replace as necessary.
6.3 The oat has come out of
adjustment.
Adjust the oat as necessary.
HIGH PRESSURE SYSTEM
1.0 The pump will not come up to normal cleaning pressure
Possible Cause Solution
1.1 The pressure adjusting
valve is faulty.
Inspect the valve. Repair or replace if necessary.
1.2 Worn seals or valves in
the pump.
Test the pump output volume directly from the pump
at normal running rpm. If the volume is below the
manufacturer’s specications, replace the seals and
inspect for defective valves.
1.3 The pump rpm is too low. Check for a loose pump belt. Adjust or replace as
necessary.
Check the engine rpm and adjust as necessary to
3,200 rpm under no vacuum load.
1.4 The primary orice is
missing or loose.
Remove and inspect. Tighten or replace as
necessary.
1.5 The primary and
secondary orices have
been installed incorrectly.
Inspect and reverse if necessary. Refer to the
Machine Assemblies & Parts List Section.
1.6 The primary orice is
worn.
Measure the orice size and replace as necessary.
Correct size is 0.021”.
2.0 No pressure reading on gauge
Possible Cause Solution
2.1 The pump belt is broken. Inspect and replace if necessary.
2.2 The gauge is faulty. Replace the gauge.
3.0 The psi gauge reads normal; low pressure from wand
Possible Cause Solution
3.1 Restriction in the cleaning
tool.
Inspect the tool jet(s) and clean or replace as
necessary.
Inspect any lters in the cleaning tool and clean or
replace as necessary.
3.2 Faulty quick connect in the
system.
Inspect each quick connect and replace as
necessary.
3.3 Restriction in one of the
solution hoses.
Remove the quick connects and inspect hoses.
Clean or replace as necessary.
3.4 Hard water deposits
restricting the system.
Descale the truckmount.