(1) Remove middle metal plate to gain access to the top surface of the kingpin
Compressed air for cleaning purposes will not exceed 30
psi. Particles blown by compressed air are hazardous.
Make certain the air stream is directed away from user
and other personnel in the area. To prevent injury,
user must wear protective goggles or face shield when
using compressed air.
(2) Using the air-arc process, remove the welds securing the kingpin upper
surface and plug welds from the kingpin "mushroom". A 300 amp welder is
required along with a "shop air" supply of 90 psi. Care must be taken to
minimize damage to the bolster plate. Damage to the kingpin being removed
is of no consequence.
(3) Remove the kingpin.
Wear welding mask, gloves, and apron when welding or
using cutting torch. Failure to wear adequate
protective clothing may result in serious injury.
(1) Grind the area of the bolster plate under the kingpin "mushroom" flush S0
that the new kingpin will lie flat on the bolster plate.
(2) Install the new kingpin. Locate the holes in the kingpin top in the same
manner as the one removed.
Figure 5-9. Kingpin