at flanges and mounting brackets
for tightness.
Diesel Particulate Filter (DPF)
• Check DPF, clamps, and mounting
brackets. Tighten if necessary.
Inspect DPF for signs of rust or
corrosion.
• Check internal baffling. You can do
this by listening for rattling sounds
while tapping on the (DPF with a
rubber mallet or revving the engine
up and down through its normal
operating range.
DEF Tank (See Aftertreatment System
manual)
Exhaust Tail Pipe
Engine Fan and Shroud
Hood Insulation Blanket
Inner Fenders Shields and Cab Skirts
Diesel Exhaust Fluid (DEF)
Tank Straps
During normal operation of the truck, the
DEF tank straps may relax. Inspect the
spring on top of the strap. If more than ½"
(12.7mm) of the spring is exposed, the bolt
will need to be re-torqued between 70 – 80
in-lbs. (7.9 – 9 Nm). This distance (1) is
measured from the washer at the end of
the spring to the edge of the tube at the top
of the straps.
See Engine Operator's Manual for DEF
filter maintenance interval.
Rear Axle and Suspension
Your vehicle's suspension, by design,
requires a minimal amount of maintenance.
However, suspensions in over-the-road
operations require periodic inspection to
ensure trouble-free performance.
WARNING
DO NOT work on the vehicle without
the parking brake set and wheels
blocked securely. If the vehicle is not
secured to prevent uncontrolled vehi-
cle movement, it could roll and may re-
sult in death, personal injury, equip-
ment or property damage.
WARNING
DO NOT operate the vehicle if the sus-
pension U-bolts are not properly tight-
ened. Loose U-bolts will cause the
axle to not be properly secured to the
suspension, which could cause loss of
vehicle control and an accident. Loose
U-bolts can also cause uneven tire
wear and poor alignment. Failure to
comply may result in death, personal
injury, equipment or property damage.
MAINTENANCE - Diesel Exhaust Fluid (DEF) Tank Straps
Y53-6076-1D1 (09/20) 259
5
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