MAXX 450D/470D/Diesel Page 8-3
HydraMaster Corporation
10/24/02
1.0. Weak vacuum at wand. Gauge reads normal (10" to 14")
1.1. Clogged vacuum 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.
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. There is internal damage to the blower. Refer to qualified service technician.
5.0.Blower is locked and will not turn
5.1. The machine has been unused for a period on time and the blower was not
properly lubricated when it was shut down, causing rust to build up on internal
surfaces. Spray penetrating oil into blower inlet and let sit for at least one hour. Then very
carefully use pipe wrench on outer diameter of pulley on blower shaft and attempt to free
up blower. Do not use wrench directly on blower shaft. If unable to free up blower in this
manner, refer to qualified service technician.
5.2. There is internal damage to the blower. Refer to qualified service technician.
Blower Troubleshooting
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