User Manual

WARNING
DO NOT replace U-bolts and nuts with
common
U-bolts or standard nuts.
These parts are critical to vehicle safe-
ty. If the wrong U-bolts or nuts are
used, the axle could loosen or sepa-
rate from the vehicle and cause a seri-
ous accident. Use only U-bolts and
nuts of SAE Grade 8 specification or
better. Failure to comply may result in
death, personal injury, equipment or
property damage.
PACCAR 20k Front Axle
Lubrication
Proper lubrication practices are important
in maximizing the service life of the steer
axle assembly.
Kingpins, Thrust Bearings, and Tie
Rod Ends
On-Highway Applications -
Standard
• Pressure lubricate every 6 months
or 25,000 miles (40,000 km).
• A more frequent lubrication cycle is
required for axles used in on/of
f-
highway, refuse, or other severe
service applications. Use heavy-
duty, multipurpose lithium base (#2
grade) grease.
NOTE
DO NOT mix with sodium-based
grease.
PACCAR 20k Front Axle Lube Points
1
2
3
1. Upper kingpin bearing
2. Tie rod end
3. Lower kingpin bearing
NOTE
If it is difficult to grease either the up-
per
or lower bearing, try greasing the
bearings with the vehicle jacked up
and supported on axle stands to im-
prove grease flow and flush contami-
nation.
Oil Bath
Lubricate wheel end assembly with a drive
axle lubricant that meets MIL-L-2105D
specifications. Either SAE 80W
-90 mineral
based or 75W-90 synthetic gear oil is
acceptable. Check the lubricant level at
each greasing interval. Maintain the
lubrication fluid level at centerline of axle or
fill line on hub cap. Always check fluid level
on flat ground.
CAUTION
Never mix oil bath and grease-packed
wheel
ends. Mixing oil and grease will
reduce the effectiveness of both lubri-
cants and may cause damage to the
wheel ends.
MAINTENANCE - Front Axle and Suspension
254 Y53-6113-1A1 (11/20)
5