Troubleshooting - Nilfisk-ALTO Scrubtec R 6-71C 28C Service Manual

Service Manual – Focus II / Scrubtec R6 Rider Autoscrubber

Troubleshooting

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 ball. If the ball is dirty, it may get stuck in the closed position,
or close enough to it to be drawn into the closed position from the moving airflow.
• Inspect the vacuum motor inlet screen and clean any built-up debris from the screen.
• Clean built-up dirt from the inside of the squeegee tool.
• Replace the squeegee blades if they are nicked or torn.
• Inspect the hose between the squeegee tool 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.
Problem
No suction
Poor suction
Cause
Vacuum motor not running
Unknown:
Leak versus Clog
Clogged vacuum
Vacuum leaks
Correction
• Check the vacuum motor power connector
• Check the vacuum motor contactor for proper
operation
To determine whether the problem is a leak versus
a clog, remove the suction hose from the squeegee
and completely block the hose with your hand and
observe the suction. Then tilt your hand to allow free
airflow, and observe the speed of the airflow past your
hand.
Alternatively, you may complete the
Test described on page 51.
• Strong suction when blocked and weak airflow
when unblocked indicates a clog.
• Weak suction when blocked, but strong airflow
when unblocked indicates a leak.
• Weak suction and weak airflow indicate either a
massive leak, or a failing vacuum motor.
• Inspect and clean the vacuum motor inlet filter
• Inspect the suction hose between the squeegee
tool and the recovery tank
• Inspect and clean the squeegee tool
• Inspect the gasket on the recovery tank cover
• Inspect the suction hose between the squeegee
tool and recovery tank for loose connection, holes,
or damage
• Inspect the squeegee blades for nicks, cuts, and
damage
• Inspect the recovery tank drain hose and cap for
leaks
• Inspect the vacuum motor mount for leaks
Recovery System 50
Vacuum Suction