we live an learn 
google.com/search?source=ig … 10.648.898
so i have been doing that wrong as well…after all these years 
Harry Monk:
Well no there isn’t, because we were calling them “Kingpins” fifteen years before anyone had ever heard of the word “internet”.
+1
plenty of lube 
hope info helps 
As an aside : If anyone is after a `King pin lock ’ cough - trailer pin/second- hand to purchase , i have one for grabs (only 1 key though ime afraid ) -email a reasonable offer. 
Seems a strange question, are you an OD wanting to do some DIY or just curious or worried to death your axle is about to fall off. Axle King pins require checking by someone who knows what he’s looking for, some of todays vehicles actually have movement when new, when a bar/lever is used to check for lift in the wheel with the lever under the tyre and when placed into a vent hole to check for rocking. The tolerance allowed is something like up to 8mm for a 500mm diameter wheel (adjusted according to wheel size) which would be excessive but just because there is some movement it doesn’t mean an MOT fail. Obviously different manufacturers may have ther own tolerances so as I say an experienced Technician would be the best person to check this.
Kingpins, both words used for axles and trailers for as long as I can remember at least in our neck of the woods, and its been a long time now! Never heard it called Fifth wheel pin in Geordie land, can be confusing but so is life! Franky.
First thing you will know when the king pins are knackered is the steering will become very stiff, in the old days we would fit new bushes and ream them out to suit, nowadays you probably have to buy a new front axle and hub assembly.
Unless your trailer has fallen off, that would make the steering feel very light. 
Frankydobo:
Kingpins, both words used for axles and trailers for as long as I can remember at least in our neck of the woods, and its been a long time now! Never heard it called Fifth wheel pin in Geordie land, can be confusing but so is life! Franky.
No, I’ve never heard it called a fifth wheel pin either, here in deepest darkest Kent. 
Usual sign is that the steering doesn’t spin back to straight and you tend to get wandering as it’s going from one side of straight to the other as you try to correct it. It’s a sign of pretty poor maintenance to be honest. You also get lift in kingpins, that’s part of the normal wear and tear, replacement items stuff and you will hear them ‘clatter’ and you go over a series of bumps. Of course, everything wears out eventually and if they are just worn but not tight, it can just be down to mileage.
I’ve come across similar stiff steering issues when it’s actually been the universal joint in the steering column, it’s a favourite for mechanics to forget about.
Harry Monk:
Frankydobo:
Kingpins, both words used for axles and trailers for as long as I can remember at least in our neck of the woods, and its been a long time now! Never heard it called Fifth wheel pin in Geordie land, can be confusing but so is life! Franky.No, I’ve never heard it called a fifth wheel pin either, here in deepest darkest Kent.
A common phrase is to pull the pin, but there is no pin to pull! unless you are talking hand grenades
Harry Monk:
‘… I’ve never heard it called a fifth wheel pin …’
Aah, so it’s you not knowing that means we’ll all have to sit through an eight hour CPC presentation on the ■■■■ things 
Probably…
Cheers guys , no I’m not a OD but when I go over 50mph the full truck shakes violently so I was just wondering that’s all, poor maintenance I think is the cause lol !
take your grease gun, attach the female end to the ■■■■■■, pump away until goo starts easing out. she will be happy.
however, most lorries have auto lube. i hope you havn’t let it run dry.
+2
Iv known it as the king pin on the trailer to
limeyphil:
take your grease gun, attach the female end to the ■■■■■■, pump away until goo starts easing out. she will be happy.
however, most lorries have auto lube. i hope you havn’t let it run dry.
Haha , I think it is down to mileage n maintenance have to get the mechanics to take a look and sort it out
Smoggie89:
Cheers guys , no I’m not a OD but when I go over 50mph the full truck shakes violently so I was just wondering that’s all, poor maintenance I think is the cause lol !
hiya… that to me sounds like its the centre bearing or a UJ on the prop…its hard to tell when your
XXXXXXXX amount of miles away. i would’t have gone for the king pins on viberation maybe a trackrod end.
tell the garage man he’ll know from been on the job…it needs looking at.
John
sounds like uneven tyre wear.
They already turned the tyre around on the rim (was down to 1mm inside) they have tightend up the bearings aswell , I do deliveries mainly to countryside and when I get on a dual carriageway it is like I am driving off road the shaking is that bad ! It will shake for a few minutes then all of a sudden it will go normal nice and smooth then again the shaking comes back … All day everyday :@ annoying lol !!