GMC 4000 Series Service Manual page 5

TRUCK MODELS COVERED
This manual contains "on-the-vehicle" mainte­
nance and light repair information on GMC Truck
Models listed on page v. Since many truck models
with various combinations of equipment are cov­
ered in this manual, the reader must necessarily
refer to truck model applications and methods of
distinguishing design differences in each manual
section.
A ll standard equipment and the most commonly
used regular production options are included in
this manual. Many special equipment and acces­
sory items are available on these GMC Trucks,
however, these items are too numerous to permit
their coverage in this manual.
MANUAL ARRANGEMENT
This manual is divided into major sections in the
sequence shown on the margin of the title page.
A black tab bearing the major section number is
placed on the first page of each major section which
indexes with the tab on the title page. Many of the
major sections are divided into sub-sections, each
sub-section containing important and specific in­
formation on related units or components. A section
index is also included on the first page of each
major section, when the major section is divided
into sub-sections.
PAGE AND ILLUSTRATION NUMBERS
The manual pages are numbered consecutively
throughout the manual. Illustrations are numbered
consecutively within each section, or within each
sub-section when the major section is so divided.
SPECIFICATIONS
Service data, fits, and tolerances are listed at
end of each section or sub-section under the head­
ing "Specifications." In some cases reference must
GENERAL INFORMATION
IM PO R TA N T-R EA D THIS PAGE
also be made to these "Specifications." for model
application and methods of distinguishing the
various design and construction differences.
in many instances in the "Specifications" tabula­
tions. These numbers are provided primarily for
unit identification or truck model application refer­
ence, and should be referred to when ordering
parts. A ll detail service part numbers must be
obtained from the applicable Parts Book.
in many instances illustrated, throughout the text.
These tools are specially designed to accomplish
certain operations efficiently and readily. Such
tools are mentioned in the text by tool vendor's
numbers. These tools are not offered for sale by
GMC Truck and Coach Division. Information re­
garding availability of these tools can be obtained
from your Zone Office or directly from the Tech­
nical Publication Department at the Factory.
plementing or in some cases superseding infor­
mation in this manual. Information in these bul­
letins should be noted in the text of the applicable
manual section and the bulletin filed for ready
reference.
the driver are included in a booklet entitled "Own­
er's and Driver's Manual" which is placed in the
cab of every new GMC Truck.
references, are alphabetically listed in the index
in the back of this manual.
iv
Manufacturers model or part numbers are used
SPECIAL TOOLS
Special tools and equipment are mentioned, and
SERVICE BULLETINS
Service bulletins are issued, when required, sup­
OPERATION
Operating instructions from the standpoint of
ALPHABETICAL INDEX
Important subjects, with manual page number