Pads fall off. They just do in certain situations. It’s essentially a “wardrobe malfunction” for floor machines. While not embarrassing for the workhorse, it is frustrating for the operator. And it leaves the intimate undersides of the brush deck exposed that will then face further, more expensive damage.
Why does this happen? And how can it be prevented?
Why it happens.
Pad clips break. This can be due to normal wear and tear or can be a result of using the attached pads for too long.
When the pad gets too thin the pad clip begins to rub on floor. Since the pad clip is for a specific thickness of pad for a secure fit, it stands to reason that as the pad wears thin, the clip begins to take some harsh treatment against the floor surface and begin scratching your floor. This can cause the clip to pop loose and then the pad falls off and the operator becoming frustrated.
Clips can crack and break from time to time due to uneven or rough floors. Over the course of time the clip can lose its tight fit and stop holding the pad on.
Made to squeeze into place and hold, once the initial fit is compromised (the compression and expansion is diminished, or the squeeze capacity is gone and doesn’t bounce back), the clip works loose as cleaning takes place.
These issues ensure that your pad will not stay put. Result? Frustrated operator and possibly some messed up floors. This is an example of what happens when pads are not inspected and cleaned before each use. A worn down pad has caused damage to the clip and and the pad driver will make contact with your floor. You don't want this neglected filthy thing on your floor!
Overused pads cause a chain reaction.
The life of a floor pad depends greatly on its rate of use (daily or weekly), proper use (i.e. not using the wrong pad for stripping floors), and how often the operator flips or cleans the pad.
With use, pads eventually lose effectiveness and wear down. When worn thin, this begins to affect the clip holding the pad to the pad holder as well as the pad holder itself.
A pad not being changed and run too long beyond its usefulness allows the underlying velcro/or bristles on the holder to make contact with the floor, not only damaging the floor but the holder itself.
In turn, pads can no longer be held securely as one of the main components of adhesion for the pad (velcro or bristles) is gone. This starts a chain reaction of loose and missing parts.
Gimbals get worn out. Wouldn’t you? They take a beating.
The gimbal holds the pad driver or brush assembly to the brush deck. When the parts malfunction due to normal wear and tear or, in some cases, abuse (impact of the brush or pad against objects that it should not come in contact with). The clip above shows the Tennant/Nobles style of clutch plates. Worn wire springs can cause the pad driver to fall off. This 16" pad driver goes onto a SS5 or a T5 32" Floor Scrubber.
When the spring gets worn or the edges of the gimbal head itself get worn from use, the tight fit is compromised. As soon as a bump occurs, the entire assembly falls from the machine with which it should hang tight.
In a similar way, on Tennant and Nobles machines, the retainer clip wire or the gimbal head gets worn from use and the attachment is compromised allowing the brush assembly to separate. The clip above show the Tennant 5700 5680 style retainer spring.
On high speed burnishers the issue can be particularly dangerous as the machine works at high speeds as the very name suggests. The causes here also center around the pad clip and pad issues.
Buffing pads are held to the pad holder assembly with velcro and a pad clip. The velcro on a burnisher has more hold than a scrubber brush deck as the burnisher needs more flex to properly buff floors. So it's important to keep the velcro teeth in good shape.
Making sure the pad is centered around the center loc attachment on the pad holder and then properly tightening the outer part of the center loc attachment will hold the pad well in place.
If the pad clip (i.e. center loc, retainer clip) is improperly installed or not tightened onto the holder; or becomes cracked, it will fail and result in loss of the pad. Or to be more descriptive, the pad flies off at high speed and can injure people, products, or property in its flight path. The clip itself can also become a projectile causing even further damage.
If pads become too worn (under 1/4” thickness, generally speaking), the clip makes constant, high speed, contact with the floor. The clip can no longer hold the pad as tight as it should be and this allows, you guessed it, the pad to fly off. And while the velcro of the pad holder does hold the pad in place, it cannot do the job alone so once the clip fails, the velcro fails.
An added bonus of this progression is the velcro teeth getting worn down and not being able to hold on to any pad. Both the velcro rubbing against the floor as well as clip gouging against it can leave floor damage.
Another issue in this same area is if the center of the pad has become stretched. This ensures that the pad clip isn’t holding the pad properly and will once again affect the clip’s ability to hang on to the pad. Once the pad is slung off the pad holder assembly, it is important to inspect thoroughly the reason for the failure.
How can it be prevented?
The short answer is proper maintenance. Replace pads and brushes whenever wear begins to show. This ensures they last longer and so will the rest of brush deck parts.
Routinely check pad clips and gimbals. This will go a long way to not leaving you stranded with a disabled machine.
For replacement pad clips, gimbals, pads or brushes, visit our store for great prices. If you don’t know exactly what you need, give us a call and we can help.
So your Clarke Boost making loud, rattling or chattering noises? When properly working it should not make much noise at all. But after many hours of use (and maybe abuse) there are parts that will wear and need to be replaced. In this article we will go over how to take apart the Clarke Boost L20 Head Assembly and find out what needs replaced.
First remove the brush deck from the machine. Instructions on doing that can be found