Spring washer on a Toro Timemaster

[donald0039]

A convex spring washer is used to hold a V-belt pulley tight. I assume the washer needs to installed so the convex part faces up towards the nut? In other words the raised center section of the washer faces up?

 

[Rivets]

No, the convex goes toward the pulley, so pres is applied to the pulley not the nut.

 

[donald0039]

No, the convex goes toward the pulley, so pres is applied to the pulley not the nut.

I think we are saying the same thing. In this case the nut is above the pulley. The washer is larger than the nut. If the washer is installed with the high part under the nut then the outside edge of the washer will be hitting the pulley.

 

[Rivets]

Are you talking about the cogged timing pulley? This pulley should be tight to the shaft and there is no bearing, which I think you are wondering about. Shaft, pulley, washer and nut all turn as one assembly, when installed correctly.

 

[Auto Doc's]

A convex spring washer is used to hold a V-belt pulley tight. I assume the washer needs to installed so the convex part faces up towards the nut? In other words the raised center section of the washer faces up?

Hell D.,

These are known as a Belleville spring washer. Cup towards the pulley, raised center so the nut or bolt can tighten against it. These are preferred by some manufacturers over split-lock washers that tend to break with age and use.

 

[StarTech]

They also provides more clamping pressure over a larger area. Flat washers tend to distort in the other direction and clamping pressure therefore lessens.

And recently I upgraded a Bad Boy spindle blade retaining flat washers to the Belleville type because even at the spec torque they were slipping and tightening the retainer screw to near impossible to remove torque levels. Especially since BB specs anti-seize on the threads. Some of those flat washers actually had a indented impression of the hex head.