TRUCK SERVICE MANUAL
Air Act. Proper Maintenance of the Engine, which is the
owner operators responsibility, is essential to keep
Preventive maintenance performed on schedule is
emission levels low.
This Section sets forth the
the easiest, as well as the least expensive type of
maintenance schedule which should be followed.
maintenance. It permits the Maintenance Department to
do work on schedule, rather than at inconvenient hours.
Accessories must have a place in the maintenance
To prove that you have properly maintained
schedule the same as the basic engine, for an accessory
the Engine you should retain records, such as work
failure may put the engine out of operation. Consult
orders and receipts, showing that scheduled
maintenance has been performed.
Actual operating environment of the engine must
The maintenance record form on page 292 is for
govern the establishment of the maintenance schedule.
Some engines operate under rather clean conditions,
some under moderately dusty conditions and others
"A" MAINTENANCE CHECKS
under severely dusty or dirty conditions; each type of
operation must be analyzed as the maintenance
Check Leaks And Correct
schedule is established.
Hours of operation, miles [kilometers], or calendar
Check for evidence of external air, coolant or oil leakage.
period as shown on Page291are convenient units of
Tighten capscrews, fittings, connections or replace
measurement, and should be used to set up the
gaskets as necessary to correct. Check oil dipstick and
maintenance schedule interval basis. These periods, as
filler tube caps. Fig. 2-1. See that they are tightened
stated, are based on average operating conditions.
The maintenance schedule check sheet is
designed as a guide until adequate experience is
obtained to establish a schedule to meet a specific
A detailed list of component checks is provided
through several check periods; also a suggested
schedule basis is given for hours of operation, calendar
of time or miles [kilometers] driven.
A maintenance schedule should be established
using the check sheet as a guide; the result will be a
maintenance program to fit a specific operation.
The check sheet shown can be reproduced by any
printer so the forms may be available for use. The
Fig. 2-1 Checking lubricating oil filler tube cap
person making each check can then indicate directly on
the sheet that the operation has been completed. When
If there are indications of air leaks on suction side
a complete column (under A, B, C, etc.) of checks is
of fuel pump, check for air leaks by placing ST998 Sight
indicated, the engine will be ready for additional service
Gauge (1, Fig. 22) in the line between fuel filter(s) or fuel
until the next check is due.
tank and pump. Bubbles or "milky" appearance indicates
Storage For Engines Out Of Service
an air leak. Find and correct.
If an engine remains out of service for three or four
weeks (maximum six months) and its use is not
immediately forthcoming, special precautions should be
taken to prevent rust. Contact the nearest Cummins
Distributor for information concerning engine storage
Cummins Diesel Engines are built by Cummins to
comply with the requirements of the Federal (U.S.) Clean
Fig. 2-2 Check ins air leaks with ST998 Sight Gauge