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 688 of 894
TRUCK SERVICE MANUAL
HT 700D SERIES TRANSMISSIONS
Para 2-912-11
retained in the converter housing by six bolts.
Driven
gear 6 is supported in the pump body by gear shafts 5.
b. Operation (A, foldout 8).
When the converter
pump rotates, its rear hub drives pump drive gear 4.
Gear 4 is in mesh with driven gear
ASSEMBLY
6.
Thus,
as the gears rotate, oil is drawn into the inlet port and is
carried between the pump housing and the gear teeth to
the outlet s id e of the pump into the hydraulic system.
2-10.
FORWARD SUPPORT AND VALVE ASSEMBLY
The forward support and valve assembly is
connected to the rear of the converter housing It
provides support for the forward clutch and turbine shaft.
Contained within the support assembly are three valves
main pressure regulator valve assembly 3 (B, foldout
10), lockup shift valve 8, and converter bypass valve 14.
2-11.
FORWARD CLUTCH AND TURBINE SHAFT (A,
foldout 11)
a. Function
(2)
The forward clutch has multiple functions.
When engaged with low clutch, it produces first gear.
When engaged with first clutch, second, third or fourth
clutches, it produces second, third, fourth or fifth gears,
in that sequence.
b. Description
THE MODEL HAS A CLUTCH HOUSING WITH A
TURBINE SHAFT ATTACHED
ten clutch plates, a piston, a forward clutch hub and a
fourth-clutch driving hub.
(2)
The clutch housing contains an oil
collector ring attached to its outer diameter and works in
conjunction with a pitot tube to produce front governor
pressure.
The clutch housing contains the forward clutch piston,
positioned inside the housing in its bore, retained by
twenty springs, a spring retainer and a snapring.
(3)
Five of the clutch plates are internal-
splined, while the remaining five are external-tanged.
The internal-splined plates are attached to the forward
clutch hub.
The external-tanged plates are attached to
the internal grooves of the forward clutch housing.
c. Operation (A, foldout 11)
(1)
Clutch housing and shaft assembly 5
rotate when the converter turbine rotates.
Fourth-clutch
driving hub 23 also rotates causing the internal-splined
plates of the fourth-clutch pack to rotate.
(2)
When hydraulic pressure is directed to the
front side of piston 13, clutch plates 21 and 22 are
compressed together.
This locks forward-clutch hub 20
to the forward clutch housing.
Since hub 20 is splined to
the transmission main shaft, the shaft will rotate with the
hub, at input speed.
(3)
The simultaneous application of two
clutches is necessary to produce one forward or one
reverse gear.
The forward clutch is applicable only in
forward gears (refer to b .(1), (2), above).
When the
converter turbine rotates, and the forward clutch is
applied, the main shaft drives the components of the
gear unit which in turn drive the output shaft.
(4)
Rotation of the oil (pitot)collector ring
directs oil against the front pitot tube any time the
converter turbine rotates.
Thus, an increase in turbine
speed produces a proportional increase in front governor
pressure.
681
TRANSMISSION
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