How to Crimp the Ends of a Hydraulic Hose
With modern machinery it is perfectly possible to make your own hydraulic hose, crimping the ends with a piece of specialized equipment. A hydraulic hose can only be used if there is a fitting on the end. It is the method of getting this fitting on to the hose which is referred to as crimping or swaging. It is a straightforward compression method, using different sized die and a compression collar.
There are a number of crimping machines on the market. The basic method is the same for every machine.
Step 1 - Measure the Hose
Measure the length of hose that you need and cut it to size with a hose cutter. This should give a clean edge, but if it hasn’t, use a file to clean the ends.
Step 2 - Hydraulic Hose Fitting
Smear the end of the hose with lubricant and then push the fitting onto the end of the hose. You must push the hose as far into the fitting as it can go. Draw a thick chalk line around the hose at the end of the hydraulic hose fitting. This is so you can check the fitting after the crimping process.
Step 3 - The Die
The size of die vary. Make sure that the die in the machine are the correct size for the diameter of your hose.
Step 4 - Adjust the Setting
The crimping machine has a number of micrometer settings. It varies from from machine to machine. Choose the correct one for your hose.
Step 5 - Place the Hose
Push the end of the hose up into the crimping machine and through the die so that the hydraulic hose fitting appears above the die. The top of the hose, now concealed inside the fitting, should not be above the die. On most machines, you can now tighten the die slightly so that they hold the hose in place.
Step 6 - The Compression Ring
Now is the time to use the compression ring. Put the compression ring or collar on top of the die.
Step 7 - Safety Equipment
At this point put on your safety equipment. You must wear goggles, ear protectors, and strong, protective gloves.
Step 8 - Crimp
Turn on the machine: the cylinder head will slowly move down. As it pushes the collar, the collar compresses the die. Do not touch the machine until the collar is firmly at the bottom of the die. The machine should then stop. Almost all machines have a safety system inbuilt so that if the die are displaced, the machine cuts out.
Step 9 - Final Check
Check the chalk mark you made on the hose. If it is no longer at the base of the fitting, it means the hose or the fitting moved during the crimping. However tight it may seem, this is not a good crimp. Otherwise, if the chalk mark is in place, you have successfully crimped the ends of the hydraulic hose.