I’m replacing the rear suspension hydraulic cylinders and hoses on my 87 300TDT.

I can’t figure out how to connect the new cylinder and flex hose to the hardline fitting. The fitting on the hardline doesn’t move. I expected it to rotate like a brake line fitting. I’ve circled the fitting in the pic.

Is the fitting supposed to rotate or am I missing a trick to the hose on?

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92 300D. 163K. Brown on Beige
87 300TDT. 213K. Black on Saddle.
85 190D. 183K. Red on Saddle
83 280SL. 165K. Champagne metallic
87 300TE. 240K KM. Parts for the 300TDT
87 300D. Thanks DieselPaul
84 190E.

It looks like there is a tack between the flare and the tubing nut which would prevent the nut from turning.

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer

It's supposed to spin, but likely rusted, fused to the tube inside the fitting. You can try Kroil or PB blaster and shoot it in the backside of the fitting between it and the tube, and soak it good giving it time to work it's way in. Gently see if it will free up.

Inspect well before starting to work it in the event that there is a back weld as Sugar Bear indicated. These types of flares are usually meant to spin just like on a brake caliper.

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Stable Mates:
1987 300TD 310K mi (Hans)
2008 Jeep Grand Cherokee OM642 165k mi (Benzrokee)

that fitting is, for sure, supposed to spin. hit it with a propane torch.

X2 heat it until it's cherry red then spin it

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92 e300d2.5t
01 e320
05 cdi
85 chev c10

If it won't turn, could you turn the hose onto it instead?

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer

When I replaced a leaking strut years ago, that nut would not turn. I
'pre-twisted the stiff plastic line and turned the strut as much as possible to then insert the line in and "unturn" the strut so the fittings could be tightened. Awkward but doable.

Nice work to replace the rear suspension.