"Hot Hoover" HELP

[jimjimmunster]

My first suction sweeper which got me into vacuums, the ever so common Hoover Model 28. Haven't used it for awhile... Anyways, not long ago, I decided to full refurb it. Greased bearing and stuff, sanded comutator and made sure there was no sand on it or dust afterwards(didn't use steel wool, you know why). After I reassembled it I powered it on. It worked, but was running at a lower RPM and had a rubber burning smell, but the brush was unobstructed along with the belt. Can someone tell me what mistake I made or include wiring diagram or schematic of the Hoover Model 28? Thanks ~ Bill Thorner

 

[TheSpiritOf76]

let me ask this...

On a Hoover like that, their a two different types of bearing. The on the top of the motor is a sleeve bearing, or bushing as it is called. That one uses ONLY oil, I mean sewing machine oil, or 3in1 oil, NO solid grease. However the bottom bearing, under the field coil, and fan is a ball bearing. That bearing is precisely the opposite, it requires grease ONLY and not liquid oil. For if you interchange this rule, you will reek harm and damage to your motor.


 


So with that being said, did you use the correct lubricants, in the correct bearings?

 

[mchmike]

Also did you make sure the carbon brushes move freely in their housing ? And that the brush roll moved freely without a belt ?

 

[jimjimmunster]

Everything moved find and smoothly... Still does...

Everything moves freely... That top sleeve bearing did get a combination of oil and grease, but nearly no grease. Fresh carbons were installed and were worn intoa curve already those didn't change it. it really does run at a slower RPM though.

 

[TheSpiritOf76]

Just like I said....

absolutely NO grease in that upper bearing! None! Oil ONLY!!! You now need to remove it, and clean it with a Q tip and some WD-40 and make certain it is free of grease, then re oil it.

 

[vacuumlad1650]

After cleaning the bearing, soak the felt around the bearing in 4 drops of Zoom Spout Oil, then put 1 drop on a Q-Tip to do the inside. Make sure to clean off the shaft that goes inside the bearing as well
Email me with any questions
Andy

 

[kirbyvertibles]

Another point, just like said about no grease in the top, it's just as important that no oil gets into the bottom. The oil will break down the grease. As far as the slower RPM, could be a number of things. Only thing I can say is reservice it and try again.

 

[bikerray]

Another question, when you cleaned the commutator with sandpaper you didn't by any chance nick any of the wires coming from the commutator to the coils in the armature? A damaged armature would give off heat as well.

 

[jimjimmunster]

Didnt see any damage to armature... Will remove grease.

I didn't sand down the commutator, but only vacuumed it since the possibility of getting sand stuck is the little spaces between the copper plates is fairly high since I only have coarse sand paper. I will remove all of the grease for sure.