Heavy Duty Cycle; Severe Service; Noise Control Systems; General Information - Dodge D250 1990 Service Manual

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Introduction
Page OA-2
Lubrication and Maintenance
DODGE Turbo Diesel
General Information
Maintenance and lubrication service recommendations have been compiled to provide maximum protection for the
owner's investment against all reasonable types of driving conditions. Since these conditions vary with the Individual
operator's driving habits, (area in which the vehicle is operated, and type of service to which the vehicle is subject) it
is necessary to prescribe lubrication and maintenance service on a time schedule as well as mileage interval basis.
The maintenance charts are related to "Heavy Duty Cycle" only.
Heavy Duty Cycle
Vehicles with a gross vehicle weight rating of 3860 kg [8,601 lbs.] or over must conform to heavy duty emission
standards.
The GVWR for each vehicle as manufactured appears on the Safety Certification label, affixed to the lock pillar on
the drivers door. Additional information can be found in the Operating Instructions and Product Information Manual
provided with the vehicle.
Severe Service
Vehicles operating under one or more of the following conditions will require more frequent service.
1. In extremely dusty areas.
2. 50 percent or more of the vehicle's operation is In heavy city traffic in high temperature (90 degrees or higher).
3. Prolonged idling.
4. Extremely short run operation.
5. Commerciai type operation.
6. Operated in water.
Noise Control Systems
All vehicles built over 4535 kg [10,000 lbs.] Gross Vehicle Weight Rating and manufactured after 1 /1 /78 for sale and
use in the United States are required to comply with the Federal Government's Exterior Noise Regulations. These
vehicles can be identified by the Noise Emissions Control Label located in the operator's compartment.
- Required Maintenance for Noise Control Systems
The following maintenance services must be performed every 6 months or 9600 km [6,000 miles] whichever
occurs first to assure proper operation of the noise control systems. Inspection and service should be
performed anytime a malfunction is observed or suspected. In addition, proper maintenance of the entire
vehicle will help the effectiveness of the noise control system.
- Exhaust System
Inspect the entire exhaust system for leaks and damage parts. Devices such as hangers, clamps, and U-bolts
should be tight and in good condition. Damaged components, burned or blown out mufflers, burned or rusted
out exhaust pipes should be replaced according to the procedure and specifications outlined in "Exhaust",
Group 11.
- Air Cleaner Assembly
Inspect air cleaner housing for proper assembly and fit. Make certain that the air cleaner is properly positioned
and the cover is tight. Check all hoses leading to the cleaner for tightness. The air filter element must also be
clean and serviced according to the instruction outlined in the Scheduled Maintenance Section of this manual.

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