Kingpin greasing

Not a mechanic. I was always told the same thing. The grease goes in easier when the truck is jacked up, but the king pins still get grease if you don't jack up the truck. I grease my kingpins and my front springs every 2 weeks.

 

Also depends on the style of pin. Some have grooves cut into them for grease to travel instead of trying to force the grease around the perimeter of the pin. On standard old school pins I've always greased them both ways.

 

My thinking is that the lower end of the pin will get more grease all around when jacked up, and turning the steer wheel, than when the weight is on it, no matter the style. I lift my front end, grease, turn the wheel, and then lower it, and give it a little grease on the top grease zerk.

 

I do not lift

 

Greasing on the ground is typical and never an issue. If you have one that doesn’t take, lifting the weight off never helps or makes it take and there is a problem that’s most likely too late for grease to fix it.

 

on the road, grease them with wheels on the ground.

In the service bay, grease them with wheels off the ground.

Just greasing them matters more than not greasing them at all.

 

Never jacked a truck up to grease kingpins. Never any issues. I'd be far more concerned about the people who only grease the truck every 15k miles.

 

Leave it on the ground as per Spicer.
Pic is from the service manual.

 

I always heard that from old timers . Maybe true at one time? My Truck has 2.6 mil miles. Never been jacked up. Replaced a spindle about 12 yrs ago. It came with new bushings. Original ones were like new. With the top cap off we hit it with grease from the bottom till it came out the top. Proof enough for me.