Dynahoe Steering Rebuild
Removing the Kingpin turned out to be a project.
A 10Lb hammer had no effect.
This rig is a 10' length of 1-1/2" EMT conduit.
Strapped to the EMT is a length of Unistrut.
At the top is a pully. Inside the EMT is a 20Lb piece of 1-1/4" bar stock.
I welded a loop to the top end of the bar stock, and tied a rope to it.
The rope goes up and over the pully.
Close up of the pin.
There is a washer sitting on the king pin to prevent mushrooming
the king pin. This allowed me to repeatedly drop the 20Lb "hammer"
from over 8 feet. Even repeated impacts from this didn't move the
pin until I heated the middle part of the crossmember to 260+ degrees.
The washer before and after.
The crack in the block was not there before using the rig!
That is an 8 x 16 x 4 solid concrete block.
The holes were also worn out of round. The shaft and bearings are old
theater dimmer parts. I drilled a hole for a small cobalt lathe bit
held in place by a set screw. Careful shimming involved to get the shaft close
to the original centers. Used my 1/2 drill to turn the shaft. Light
cuts worked best. The collar was used as a stop for the bottom bore, which
I left at the original ID below the snap ring groove.
Bushing with groove and holes (3) for grease flow.
one of 3 grooves to bring the grease to where the highest load is.
The bushings installed in the knuckle. They are a light press fit,
with set screws were added to help keep the bushings in place.
Test fit of the kingpin.
All re-assembled.