Navistar WorkStar Series, Operator'S Manual

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Maintenance Instructions
Engine Noise Shields/Blankets
• Engine valve covers, oil pans, and block covers are made to
damp out engine mechanical noise and, if needed, should
be replaced with original equipment parts.
Exhaust System
• Inspect for leaks at various joint connections and tighten
clamps.
Make visual inspection for cracks or holes in
muffler and tailpipe. Always replace with manufacturer’s
recommended parts.
Tailpipe elbow or offset tailpipe
orientation must not be changed from standard position as
originally received.
• To avoid abnormal changes in vehicle sound level, it
is necessary for the owner to perform inspections and
necessary maintenance at the intervals shown in the
maintenance schedules, and record them on the inspection
verification form provided.
Diesel Particulate Filter (DPF)
Regeneration
Collected soot particles in the Diesel Particulate Filter (DPF)
are automatically burned off through normal regeneration
(initiated by normal exhaust heat during the normal operation of
the vehicle).
If conditions for normal regeneration cannot
be achieved, it may be necessary to perform a parked
regeneration as indicated by the instrument panel gauge
cluster warning indicators.
See the Parked Regeneration
Procedure in SECTION 5 — OPERATION.
Cleaning
If on-vehicle regeneration is unsuccessful at removing soot from
the DPF, the DPF may need to be removed from the vehicle and
be cleaned with the appropriate machinery and processes.
Ash residue in the DPF comes primarily from fuel and oil
additives and will not burn or pass through the DPF. Ash residue
accumulates very slowly in the DPF, but must eventually be
removed to prevent excessive exhaust backpressure.
If the
DPF needs to have nonregenerable soot or the ash residue
removed, please take the vehicle to an International dealer.
Transmission
Check fluid level. For manual or automated manual
transmissions, during the PM schedule, ensure that the
fluid level is at the bottom of the fill hole. For Allison Automatic
Transmissions, check the fluid level on a daily basis using the
transmission dipstick.
Check gear shift/shift linkage for proper operation.
Refer to the LUBRICATION AND MAINTENANCE INTERVAL
CHART and the LUBRICANT AND SEALER SPECIFICATIONS
chart for information on transmission fluids and fluid and filter
change intervals.
Neutral Start Switch
Manual/Automated Manual Transmissions
Check operation of the safety start switch. The starter should
ONLY operate when the clutch pedal is depressed.
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