Clarke strongarm engine crane issue

[Brum_Brum]

I have borrowed a crane from a neighbour while he is overseas and am concerned about its operation. When operating the release valve the jib does not sink smoothly like I would expect, I have to persuade it with a knock and it then comes down pretty rapid and jerky.. not ideal when I will eventually have my engine on the end.

I have checked and topped up the fluid level with the correct stuff and also tried bleeding. I notice air escapes when removing the filler bung after use, is this normal?

The crane itself has had very little use , I think twice in around 15 years.

Anyone have any advice?

Cheers !

[normalbloke]

Have you tried it with some weight on?

[Caddyshack]

Try it with a bit of weight on and see if that helps?

[Richard-D]

As above, normal for an unloaded hydraulic lift as there isn't enough weight to overcome the stiction in the ram.

[Brum_Brum]

Ahhhhh ok ! , shows my inexperience. Thanks for the replies, I’ll try some weight on it .

[Jo-say8k]

If you haven't already then a drop of oil on the joints and pins wouldn't go amiss if it's sat idle. Also a quick smear of hydraulic oil on the piston rod to help stop the ram seal from sticking

[E-bmw]

As above, you need weight to overcome the natural stiction of the arms etc & a bit of oil (if unused for a while) on the joints will reduce the stiction that needs to be overcome.