Need to replace the Stabilus lift o mat gas struts in my Hymer B644 motorhome drop down front double bed I,ve managed to locate them but need some advice on how to fit them I do have some knowledge as I am a retired motor mechanic
Use a screwdriver to pull up/out the tab on the ends where they hook onto the ball. Then measure the length of the strut fully extended. That will give you the size. On my motorhome, I needed 100 lb struts on the doors. Your struts may have the lb printed on them.
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On Facebook there is a group called 'Hymer Owners' and they have over a thousand members many of whom past their knowledge on for others. If you Motorhome is not a Hymer, then try searching for the name of your Motorhome manufacturers group. Best info I've had for my MH.
Just as you said ,remove the 8 bolts and get a couple buddys and lift the bed and slide back onto the bumper. This will give you the room needed to do the job.4 bolts up front( 2 on each side) and 4 in the back. Much easier if you had a chain hoist but lifting works too. I don't know if it will lift up enough to do the job with enough room. It was real simple to get the bolts back in place so no worries. Hope this reply isn't to late.
Most of these lift struts can be removed by propping up the gate and prying off the strut ends from their balljoint ends. Some struts have a broad metal band that acts as a spring or retainer and you may have to slide that band off and then pop the old strut off.
To put the new one on, just center the socket over the strut and press it on or tap it with a small hammer. Make sure you put it on with the strut body either up or down the same way as the one you took off. Normally the body goes to the car and the shaft to the tailgate/hatch/trunk.
The easiest way to access the fule pump is to lift the bed or drop the tank. I have lifted the bed on many occasions. Just remove the bolts that hold it to the frame, but leave the two at the rear real loose, That way when you lift the front of the bed it will stay on the truck. Once it is lifted high enough, you can easily access the pump from the top of the tank. Cutting a "trap door" in the bed is not recommended as the sparks from cutting might ignite the gas fumes. Unless you take the bed off of the truck totaly, I wouldn't even attempt it.