How do I take it Echo Rapid Loader Trimmer Head apart as the feed cams seem to be misaligned. Can't get the string into one side at all. Any ideas?Does it come apart?

In your manual under section 12: Line Head Installation. You will do the opposite of what it says here. The key is to LOCK the gear drive so the flex-drive shaft won't turn WHEN you are removing the trimmer head. They use a special tool (maybe you have it). But a small-shafted Phillips screwdriver or the like can be put in the drive hole to lock the gearing up as well. Look for the hole in the upper plate and align with the notch in the drive housing and grasping the entire string head unit, remove it. Here is your manual, see Section 12

http://dl.owneriq.net/8/854215d5-44e4-4b5d-b773-77b331fd73b3.pdf

For your machine, make sure you are using the Manufacturer's recommended trimmer line. For your model, they recommend using Echo brand .080" Cross Fire diameter line. You also need to insure that when you load the spool with the line, that it is loaded (in the right direction) so it can feed properly.

See page 29 of your user manual here:
http://dl.owneriq.net/7/7dac06e3-cacc-4083-a4da-fb7a073040b4.pdf

See how the head is installed on page 9 of the Rapidloader manual. Removal would be in reverse order of installation. You can probably use a Phillips screwdriver for the locking tool mentioned.
http://dl.owneriq.net/a/a19727c4-b4e6-466f-8b8e-635e716636c1.pdf

line up the hole on the collar that the trimmer head is installed against with the arrow or notch on the gear housing, insert a punch or the brass colored pin that most Echo pieces of equipment come included with, this will lock the head. now turn the head clock wise, IT IS LEFT HAND THREADED! so righty loosey lefty tightey. now install the rapid loader with the included washers and10mm gold colored lefthand thread nut

Did you try pushing down hard and turning @ the same time? that should do it.

It is ridiculous, there are a bunch of bolts, and then a multi-fit brochure showing a grid of nonsense.
There are instructions on the inside of the package, however that is how to string the line.

We fixed it ourselves. We first removed the rapid loader head from the weed eater, then loosened both sets of screws on the top of the loader, enabling my husband to unjamb the little slide, retightened everything, reinstalled the head and it seems to work fine.

Don't know for sure, but I found manual on amazon, Amazon com echo srm manual so take a look if you want. have a nice day

Cut two separate pieces of string, about 7 ft. each.

Stick the end of the line in the hole on the inside of spool.

Wind clockwise onto spool, putting the line that is closest to the ground on first.

Once you have winded this piece on, lock the last 4 inches of line through the slits on spool.

Repeat process for second piece of line, locking the last 4 inches in slot opposite the other locked in piece.

Put the spool on the trimmer, feeding the end of lines through either hole on trimmer.

Before you push the spool all the way on, pull the strings out of the locked position.

Jim