21 Aug 2018
Farm safety: How to fit a new and safe pto shaft guard
Often an avoided task, fitting new and safe pto guards need not be seen as such a chore, particularly with new designs of guards.
Richard Bradley tests a simple fitting option from Sparex.
Following school he completed an apprenticeship in Load More...
Richard Bradley
Following school he completed an apprenticeship in Load More...
Pto shaft guards often suffer a hard life, being neglected of maintenance, abused by link arms and dropped to the floor. They are, however, the final-line of protection against what could be a potentially lethal accident waiting to happen.
Last year alone, one person was fatally injured as the result of contacting a rotating pto shaft. A damaged guard can be as bad as a bare pto shaft – it does not take much for a pot to grab hold of clothing or loose material, such as a piece of string in your pocket.
It does not have to be all doom and gloom, though, as fitting a new guard can be easier than you may think. While traditional guards can be awkward to breakdown, meaning they can be left in damaged and sometimes unsafe conditions, some firms now offer much simpler solutions to maintain and replace.
With this in mind, we try out Sparex’s Guardloc.
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Safety
- Whenever working with or near a pto shaft, you must make sure the tractor is switched off and remove the key from the ignition. You should keep this on you at all times to prevent accidental starting.
Step 1: Removal
Getting rid of an old, and in this case, farm-fabricated guard is a necessity.
As the pto spins, the nylon bush will wear and will eventually be rendered useless. This means the guard is no longer attached to the shaft itself and can move freely. Take the retaining chain out of the equation too and you end up with a dangerous spinning guard.
With the shaft split into two halves, the old cover can be removed by pushing each of the three clips on the retaining collar inwards. This should allow the guard to slide freely from the shaft, where it should be put in the bin.
While this may sound simple, guards which have been damaged or are worn can be considerably more difficult to remove. And, even with relatively intact guards, trying to push three clips inwards simultaneously with separate screw drivers, while pulling back the guard is no walk in the park.
Three clips require pushing in simultaneously. After much perseverance, we gave up with screwdrivers .
Step 2: Inspection and cleaning
Once the old guard is removed, the pto tubes, yokes and crosses should be inspected for any damage and excessive wear. Replace if necessary.
It may be an idea to give the shaft a spring clean, either with a degreaser or a pressure washer. Be sure to reapply grease in-between the inner and outer shaft tubes, and both universal joints, forcing any water out.
Safety
- When carrying out repairs, it is pretty advisable to use nitrile or other suitable protective gloves, to prevent grease covered hands. If using degreasing agents, be sure to use suitable gloves, and avoid contact with your skin.
- If you decide to use powered tools at any point, be sure to wear suitable ppe, which may include safety footwear, goggles, gloves and ear defenders.
Step 3: Measuring
With the new shaft removed from its packaging, you should find a selection of different sized nylon bearing rings and a manual.
You should measure the size of pto tube, and the bearing recess on the yoke, consulting the manual to see which size ring should be used.
With sizes figured out, the shafts should be slid all the way together, allowing the overall length of the pto tube to be measured.
To prevent damaging the guard, both pieces should be cut 75mm (3in) shorter than the pto tube itself. As it is only thin plastic, the guard can be cut easily enough with a decent hacksaw.
Step 4: Fitting
Place the bearing ring over the shaft and fit into the recess on the yoke.
Sliding the guard over the tube then reveals the simplicity of the Guardloc system. As the guard comes into contact with the bush, a locking handle slides through the guard and grips onto the bush, allowing the guard to spin freely from the shaft, but preventing any fore and aft movement.
By using a screwdriver or trusty penknife, the locking handle can be easily flicked and pulled out to pull back or remove the guard.
Make sure chains properly secure either end of the guard before use. These should be shortened to prevent the chain wrapping around the guard, which can lead to damage.
The red arm locks in to secure the guard and can be removed using a screwdriver.
Lifting the arm allows the guard to be pulled back, making for easier and cleaner greasing of universal joints.
FG Verdict
The Guardloc system is very simple to install and remove, with little knowledge or experience. Hopefully this will encourage users to replace the guard if and when it becomes damaged, and help to reduce the chance of potential accidents.
Being able to easily pull back the guard also makes connecting the pto to tractors and implements, particularly those with fixed guards, much easier. Pulling back the guard also makes for cleaner and easier greasing, as you do not have to wrestle the pto shaft to get at the grease nipple.
And, with a price of £60 plus VAT, it is a small price to pay for your safety.
Also tried
As well as the Guardloc system for conventional pto shafts, other options are also available.
One firm, which also produces easy to fit guards for wide-angle ptos is BareCo, available through Spaldings. This system uses a cam-style locking mechanism, and allows the wide-angle joint to be accessed by removing two clips.
Along with being easier to use, this makes sure you can find and adequately grease each of the points spread out over the wide-angle joint.
Safety
- Whenever working with or near a pto shaft, you must make sure the tractor is switched off and remove the key from the ignition. You should keep this on you at all times to prevent accidental starting.
- When carrying out repairs, it is pretty advisable to use nitrile or other suitable protective gloves, to prevent grease covered hands. If using degreasing agents, be sure to use suitable gloves, and avoid contact with your skin
- If you decide to use powered tools at any point, be sure to wear suitable ppe, which may include safety footwear, goggles, gloves and ear defenders
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