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Why are hydraulic crimp dimensions so important?
Let’s have a look at some of the reasons why sticking to the official crimp diameter is so important…
If you are assembling your own hydraulic hoses in your workshop or for onsite repairs then you may be in need of a hydraulic hose crimping machine that allows you to crimp your own fittings yourself. Not only does this enable you to crimp hoses yourself but it can save time because you won’t have to travel to the nearest place to have this done by someone else.
Hydraulic hoses are used on all sorts of systems and are made to specific lengths depending on where they are mounted on hydraulic components. By having your own hydraulic hose crimping machine, you no longer have to mount all the components, then measure up the hose lengths and go off to get the hoses crimped only to have to completely re-mount the components again afterwards.
Before you crimp any hydraulic hose, you should ensure that you have the correct equipment available.
Recommended safety equipment includes:
- Goggles,
- Ear protectors,
- Strong, protective gloves.
Crimping hydraulic hoses doesn’t need to be difficult. Simply follow the steps below:
- Measure the length of hose your hydraulic system requires and cut to the right length. Before cutting, for critical hose lengths ensure to account for the cut off factor when determining the final length. If the edge of the hose is rough then this should be filed smooth.
- Determine the insertion depth for the hydraulic hose within the appropriate fitting to ensure that once the assembly of the hydraulic system is complete it won’t fail.
Tip: Mark the insertion depth on the hydraulic hose with chalk to ensure accuracy.
- Choose the correct crimp diameter for each hose, before selecting the correct crimp die set.
- Push the hydraulic hose into the crimping machine and through the crimp die until the hose’s fitting appears above the crimp die. The top of the hose should not be visible above the crimp die.
- Place the compression ring or collar above the crimp die.
- Ensure that you have put on your safety gear.
- Turn on the hydraulic hose crimping machine.
- The crimping machine then pushes the collar that compresses the die and the machine will stop once the collar is at the bottom of the crimp die.
- If you have marked the insertion depth with chalk checking whether the hydraulic hose crimping was successful should be simple. A chalk mark that is no longer at the base of the fitting then this is not a secure crimp and a result of the hose or fitting moving during the crimping process. A chalk mark that has not moved is the sign of a good, secure crimp to a hydraulic hose.
The crimp spec is important because not only does it make sure that you have a safe crimp, that you don’t have a hose fitting that pops off within the first minutes or pressure cycles or whatever, the most reliable crimp is the most accurate one. If the hose has a thicker cover than the tail is designed for, no amount of tail collapse will help. The barbs will not cut through the cover and will not get a grip on the wire. It will blow off. If the cover is too thin, the barbs may be too aggressive, and the liner will be damaged when it is crimped. This may work for a while, but it will most likely fail over time. Also, because if you over crimp, it may stay on but it also might just eat through the carcass and the middle braiding and pop off anyway. You also crush the ID of the hose and you restrict flow. Ensuring that you have an accurate crimp, again in this example, specified within 0.1 of an mm, that really tells you how specific a crimp should be.
For your catalogue, when you’re doing a hose crimp, make sure you get as close to that number as possible. Anywhere outside that should be redone. It’s just not worth messing around for an $8 fitting. The time it takes to redo it, there’s no point in doing anything but the right way. You measure with callipers. You’d do your hose crimp and measure right across the centre points and that’s your most accurate way.