1-6. EQUIPMENT IMPROVEMENT REPORT AND MAINTENANCE DIGEST (EIR MD)
1-7. METRIC SYSTEM
1-8. MANDATORY REPLACEMENT PARTS
1-9. BREAK-IN PROCEDURE
The quarterly Equipment Improvement Report and Maintenance Digest, TB 43-0001-39 series, contains
valuable field information on the equipment covered in this manual. The information in the TB 43-0001-39
series is compiled from some of the Equipment Improvement Reports that you prepared on the vehicles
covered in this manual. Many of these articles resulted from comments, suggestions, and improvement
recommendations that you submitted to the EIR program. The TB 43-0001-39 series contains information
on equipment improvements, minor alterations, proposed Modification Work Orders (MWOs), warranties (if
applicable), actions taken on some of your DA, Form 2028's (Recommended Changes to Publications), and
advance information on proposed changes that may affect this manual. The information will help you in
doing your job better and will help in keeping you advised of the latest changes to this manual. Also refer to
DA Pam 25-30, Consolidated Index of Army Publications and Blank Forms and Appendix A, References, of
this manual. For those with access to the World Wide Web (WWW), the EIR MD can be viewed through the
Army Electronic Product Support. The site is http://aeps.ria.army.mil.
The equipment described herein contains metric components and requires metric common and special
tools; therefore, metric units in addition to standard units will be used throughout this publication.
In addition, a metric conversion table is located on the inside back cover of this publication.
The maintenance instructions contained herein make reference to removing and discarding piece
parts such as: gaskets, lockwashers, cotter pins, O-rings, seals; etc.; these items should be considered
mandatory replacement items and replaced with new parts during assembly/installation.
Upon receipt of vehicles, or after engine replacement, break-in procedures must be observed during the
first 500 miles (804 kilometers) of operation. For break-in procedure, refer to TM 9-2320-280-10.
The 1-1/4 ton, 4x4, M998 series of vehicles are tactical vehicles designed for use over all types of roads, as
well as cross-country terrain in all weather conditions. The vehicles have four driving wheels powered by
a V-8, liquid-cooled, diesel engine. Four-wheel hydraulic service brakes and a mechanical parking brake
are common to all models in the M998 series. All vehicles are equipped with a pintle hook for towing.
Tiedown and lifting eyes are provided for air, rail, or sea shipment.
Section II. EQUIPMENT DESCRIPTION AND DATA
1-10. EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES