Kingpin bearings should be lubricated at each
chassis lubrication (approximately 1,000 mile intervals).
To ensure thorough lubrication, the front axle should be
raised slightly to relieve weight. The lower kingpin lube
fitting is located in the lower kingpin bearing plate and is
accessible in the top surface of the lower arm of the
suspension yoke (See fig. 3). The upper kingpin fitting
is either on the front or rear of the upper kingpin bracket
(See fig. 3).
Differential carrier should have the lubricant
changed at the same intervals as the rear axle on the
vehicle or at 10,000 mile intervals. Drain while lubricant
is warm. Clean the magnetic drain plug when it is
removed. Remove the fill plug to ensure quicker
drainage. Allow housing to drain completely. Install the
drain plug and fill the housing with the appropriate gear
oil to the bottom of the fill plug hole. Check for leaks.
SAE 140 gear oil (meeting Mil-L-2105B) is appropriate
for most operating conditions. Follow the vehicle
manufacturers recommendations for the rear axle and
apply them to the front axle under other conditions.
Steering Tie Rod Ball Joints
Steering tie rod ball joints should be lubricated
every 1,000 miles with chassis lubricant (See fig. 3).
Check the steering system at each lubrication. Inspect
for loose, bent or otherwise damaged components.
Careful attention to such details is a vital safety factor.