10/7/02
Page 7-3: Vacuum System
Boxxer 421
Vacuum System
Troubleshooting
1.0. Weak vacuum at wand. Gauge reads normal (10" to 12" with
hoses & wand attached)
1.1. Clogged hoses or wand tube. Disconnect hoses and check carefully for an obstruction.
1.2. Excessive length of hoses connected to machine. Make sure machine is rated for the
conditions under which it is being operated.
2.0. Vacuum gauge will not come up to 12" hg
2.1. There is an air leak somewhere in the vacuum system. Check vacuum relief valve for
proper adjustment. Carefully check all vacuum hoses for a cut or break. Check recovery
tank lid gasket. Make sure recovery tank drain valve is fully closed.
2.2. Vacuum blower is turning too slowly. Check engine RPM. Adjust as necessary to 3000
RPM.
2.3. The vacuum gauge is defective. Test gauge and replace as necessary.
3.0. Vacuum gauge reads too high with no hoses attached
3.1. Filter in recovery tank is clogged. Remove and clean or replace as necessary.
3.2. Hose from vacuum blower to recovery tank is collapsed internally. Inspect and
replace as necessary.
4.0. Noisy vacuum blower
4.1. Vacuum blower is low on oil. Inspect oil level and replenish as necessary. Note:
Running vacuum blower low on oil can cause severe mechanical damage. If this situation
occurs, it should be inspected by a qualified service technician.
4.2. Vacuum blower has internal damage. Refer to qualified service technician.
5.0. Vacuum blower is locked and will not turn.
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