Always be sure your machine is unplugged from the electrical outlet before proceeding!

Although this repair is shown with a Hoover Steamvac Model F7431-900, the procedure will be very similar for all Hoover Steamvac Series Models F72xx-xxx and F74xx-xxx and can be used as a guide.  The turbine is the air powered part that turns the 5 or 6 brush unit. It is very common that the turbine gets damp and the bearings / bushings freeze up. To verify that your turbine has seized up; remove both the clean water tank and the dirty water tank, remove the brush unit from the bottom of the machine. Turn you Steamvac on its’ side on a workbench. Refer to the picture below. Using a large flat blade screwdriver; place the tip of the screwdriver into the square white hole of the turbine and try to spin it. It should spin freely, if it is very difficult or impossible to turn then repair/replacement is needed.                                                                                                                                                                                                        

To remove the turbine; first remove the Front Nozzle as shown below, just lift it up near the top and pull it forward and set it aside.

Remove the screw from the hood – below.

Turn the machine over and remove 6 screws as shown below.

Turn the Steamvac right side up, set the hood aside and remove the 2 screws and 2 pieces of tubing from the turbine as shown below.

Remove the turbine and set it aside.  (Instructions continue below.)

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Now you can disassemble the turbine to see if it is salvageable or if it needs to be replaced.  First, turn it over and remove the 4 screws from the  bottom gear assembly cover as shown. Leave the cover on for now.

Turn the turbine right side up and lift up the 3 tabs that secure the bottom and top halves together.

Top of turbine with top cover removed is shown below.

Now, turn the turbine over and remove the bottom gear cover as shown.  Check the large plastic gear for broken / worn teeth. The cover can be washed without doing damage. If any gear teeth are broken, the gear and therefore the whole turbine is useless. Replace the turbine.

Check the other gear for broken teeth. See the picture below. Check the ball bearing that you can see(shown by the arrow). It is most likely very rusty, but you may be able to save it. Remove the bearing seal and spray it with WD40 to see if it loosens up. If it does loosen up and spins freely and you’re confident that both gears will spin, blot out as much of the WD40 as you can with a paper towel and put a couple dabs of white lithium grease into the bearing and replace the bearing seal. Reinstall the turbine and test your machine.  Otherwise, just go ahead and install a new turbine.