TM-5-3805-254-14-P-2
TRUCK, DUMP, 20 TON, 6X4, ON-OFF HIGHWAY 71,000 GVW, IHC MODEL F-5070 (CCE)
TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, GENERAL SUPPORT AND DEPT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS INFORMATION AND SUPPLEMENTAL MAINTENANCE INSTRUCTIONS)
JUNE 1980
TM-5-3805-254-14-P-2 - Page 679 of 894
TRANSMISSION
TRUCK SERVICE MANUAL
Para 1-1/1-4
Section 1.
GENERAL INFORMATION
1-1.
SCOPE OF MANUAL
a.
Coverage.
This
Service
Manual
describes the operation, maintenance, and overhaul
procedures for the
HT 750CRD
automatic transmission (fig.
1-3 AND 1-4
-).
The
major components of the transmission are discussed,
and the function and operation of the hydraulic
system and torque paths are explained.
Detailed
instructions are provided for disassembly, rebuild and
assembly.
Wear limits information, par t s inspection
procedures, and torque specifications are also
included.
b.
Illustrations.
The text is illustrated with
photographs, line drawings, and cross-section views.
The overhaul procedures are illustrated mainly by
photographs.
Line drawings are used to supplement
detailed assembly procedures; cross-section views
illustrate the torque paths and relationship of
assembled parts.
Cross-section views, color-coded
schematics of the hydraulic system, and all exploded
views are presented on foldout pages at the back of
the manual.
1-2.
SUPPLEMENTARY INFORMATION
Supplementary information will be issued, as
required, to cover any improvements which may
occur after publication of this manual.
Check with
your dealer to insure you have the latest information.
1-3.
ORDERING PARTS
a.
Transmission
Nameplate.
The
nameplate (fig.
1-7) is located on the right-rear side
of the transmission.
The nameplate displays the
transmission serial number, part number (assembly
number), and model number.
All three of these must
be supplied when o r d e r in g replacement parts or
requesting
service
information.
b.
Parts Catalog.
All replacement parts
should be ordered from your dealer.
These parts are
listed in the current HT 700 Series Parts Catalog (SA
1268).
Do not order by illustration item numb e r s
used on exploded views in this manual.
1-4.
GENERAL DESCRIPTION
a.
Automatic Shifting.
Automatic shifting is
accomplished in all ranges.
THE DESIGN
INCORPORATES FIVE SPEEDS FORWARD AND
ONE
REVERSE.THE
TRANSMISSION
WAS
DESIGNED FOR OPERATION WITH A DIESEL
ENGINE.
b.
Torque Converter.
A simple, 3element
torque converter (fig
1-4
) transmits power from the
engine to the transmission gearing.
The torque
converter serves as both a fluid coupling and a
torque multiplier.
THE TORQUE CONVERTETER USED IN THIS
TRANSMISSION HAS A STALL RATIO OF 2.8:1.
c.
Lockup
Clutch.
This
clutch
automatically locks the turbine element of the torque
converter to the flywheel.
When the vehicle attains
sufficient speed, hydraulic pressure automatically app
lie s the lockup clutch.
When the lockup clutch is
applied, the engine output is directed to the
transmission gearing at a 1:1 speed ratio.
A
decrease in speed automatically releases the lockup
clutch.
672
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