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 692 of 894
TRUCK SERVICE MANUAL
HT 700D SERIES TRANSMISSIONS
Para 2-19/2-23
2-19.
SPEEDOMETER DRIVE
a. Description (A, foldout 16)
(1)
The speedometer drive consists of drive
gear 24 and driven gear bushing 15.
(2)
Drive gear 24 is a worm gear with a right
hand helix.
The gear is concentric with the output shaft
and has no key or drive splines.
The drive gear is
clamped between rotating parts which, in turn, cause the
drive gear to rotate.
b. Operation
(A,
foldout
16).
When
the
transmission output shaft rotates, drive gear 24 rotates.
Bushing
15
supports
the
driven
gear
(vehicle
furnished)within the rear cover.
The driven gear rotates
clockwise (as viewed at the cable connection in the rear
cover) during forward operation.
2-20.
GOVERNOR
a. Description(A, foldout 16).
Governor assembly
38 is a centrifugal (flyweight) governor which is driven by
output shaft 23 or 30.
The governor is supported by a
bore in rear cover 14 and pin 11, and retained in the rear
cover by cover 42.
b. Operation (A, foldout 16).
Rotation of the
governor causes the governor valve (foldouts
5,
) to
travel within its bore.
When the valve moves leftward,
governor pressure rises; when the valve moves
rightward governor pressure falls.
Thus, governor
pressure is proportional to transmission output speed.
Governor pressure, in combination with modulator
pressure (para 2-26h, below), provides the automatic
shifting in the transmission.
(Refer also to para 2-26g, i,
L k,
below, for additional information about
automatic shift circuits.)
2-21.
CONTROL VALVE ASSEMBLY
a. Description (B, foldout 16).
Control valve body
assembly 1 includes the various valves, springs and
other components which control the selection of ranges,
and the automatic shifting of gears.
The valve body
assembly is bolted to the bottom of the transmission
case, which is channeled to direct the flow of oil between
the valve body and clutches, and other components.
b. Operation.
Refer to paragraph 2-26, below, for
operation of the control valve body assembly.
2-22.
LOW SHIFT AND TRIMMER VALVES
a. Description (A, foldout 17).
Low shift valve body
assembly 2 contains a relay valve, a shift valve, springs,
pins and an adjusting ring.
It is mounted on the bottom
of the control valve assembly, and retained by bolt 1.
Mounted directly under the low shift valve body, is low-
trimmer valve body assembly 18.
This body consists of
a valve, trimmer and retainer plugs, a spring, a valve
stop and a pin.
Six bolts (17), extending through both
valve bodies and the control valve assembly into the
transmission housing, retain the two bodies.
2-24.
OIL PAN AND OIL FILTER
a. Description (A, foldout 14)
(1)
Oil pan 30 is a pressed steel assembly
that provides one opening for attaching a combination oil
filter and level gage tube, and another for draining the oil.
Earlier models did not provide a separate drain, and oil
was drained by loosening the filler tube.
(2)
Oil filter 25 is a box-like sheet metal frame
with a perforated sheet metal reinforcement covered by a
fine-mesh screen across the bottom.
Sump oil is drawn
through the screen by the oil pump and directed into the
hydraulic system.
Screw 28 attaches the oil filter to the
bottom of the control valve body assembly.
b. Function (A, foldout 14)
(1)
Oilpan30 holds the entire oil supply for the
transmission and covers the control valve body
assemblies and oil filter.
685
TRANSMISSION
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