Vacuum / Recovery System Service Maintenance Checklist; Troubleshooting Guide; Vacuum Leaks; Restrictions - Nilfisk-Advance Adphibian AX 651 Multi EDS Service Manual

Vacuum / Recovery System Service Maintenance Checklist

Whenever there is a vacuum problem, it's best to check over the entire system. Use the checklist below as a guide, to
thoroughly check the vacuum system.
Inspect and clean the vacuum motor float switch.
Inspect the vacuum motor inlet screens and clean any built-up debris from the screens.
Clean built-up dirt from the vacuum shoes.
Clean built-up dirt from the vacuum hoses to the vacuum shoes.
Clean built-up dirt from the inside of the squeegee tool.
Replace the squeegee blades if they are nicked or torn.
Inspect the hoses between the squeegee tool/vacuum shoes and the recovery tank and rinse any built-up dirt
from the hose. Replace the hose if it is kinked or damaged.
Inspect and make sure the gasket on the recovery tank cover is sealing and not damaged.
Make sure that the recovery tank drain hose cap seals airtight.

Troubleshooting Guide

If water flows around the ends of the squeegee tool instead of being pulled into the tool, the vacuum system is not
working correctly. When a vacuum system performs poorly, it is usually because of one of the following problems:

Vacuum Leaks

Vacuum leaks are caused by air flowing into the vacuum system past a bad gasket or leaky hose, damaged tank or a
leaky drain valve. A vacuum leak below the waterline will create turbulence in the recovery tank, causing water to enter
the vacuum motors.

Restrictions

Restrictions are anything that blocks the flow of air through the system. Restrictions may also be caused by built-up
debris in the vacuum shoes, squeegee tool, vacuum hoses or vacuum motor inlet screens, or wherever the airflow is
forced to make a sharp turn.
Both leaks and restrictions decrease the quantity of air flowing through the vacuum shoes or squeegee tool. The air
that does go through the vacuum shoes or squeegee tool moves slower, so it has less suction (water lift performance).
Form No. 56043116 - Adphibian™/AX 651 Multi EDS/AquaPLUS™ - 49