Service Manual: SC750, SC800, SC 750 ST, SC800 ST
Form Number 56043150 Page 72
Troubleshooting
Vacuum Motor Does Not Turn On (Scrub function works)
Possible Causes:
• Defecve Vacuum Motor
• Defecve Vacuum Motor Contactor (Relay)
• Defecve Wiring
• Defecve
Good water pick up performance depends on the proper amount of air owing through the squeegee pickup tool. Air
entering the vacuum system before the pickup tool will reduce its ability to pick up water. Anything that restricts the
movement of air through the system will also reduce its ability to pick up water.
Possible Causes:
• Restricted air ow
o Clogged or kinked squeegee vacuum hose
o Clogged vacuum motor inlet or outlet port
• Damaged squeegees
• Air leaks
o Recovery tank lid gasket is not sealing
o Cracked squeegee vacuum hose
o Cracked recovery tank
• Vacuum motor is weak
Begin with a good visual inspecon of the system. Check the condion of the squeegees and the recovery hose. Take the
recovery hose o and rinse it out. Check the recover tank cover gasket condion. Repair any problems found.
If no visual problems are found, test the system using a vacuum gauge PN 56205281 and open- hole adapter. (See the
Special Tools Secon below. The adapter can be made from a piece of PVC pipe.)
1. Remove the vacuum hose from the squeegee tool.
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