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 689 of 894
TRUCK SERVICE MANUAL
DESCRI PTION AND OPERATION
Para 2-1212-13
2-12.
FOURTH CLUTCH (B, foldout 11)
a. Function
(2)
The fourth clutch has a dual function.
Engaged with the forward clutch, it produces fifth gear.
Engaged with the low clutch, it produces reverse gear.
b. Description.
The fourth clutch contain ten clutch
plates, a clutch piston housing and a piston.
Five plates
are internally splined and five are externally tanged.
The
piston is positioned inside the clutch housing in its bore
and retained by twenty piston return springs, a spring
retainer and a snapring.
c. Operation (B, foldout 11)
(All models)
(1)
Internal-splined clutch plates 4, driven by
the fourth-clutch driving hub, rotate any time the input
shaft and the forward clutch housing assembly rotates.
(2)
When hydraulic pressure is directed to the
back side of fourth-clutch piston 9, the piston
compresses clutch plates 4 and 5 together.
This locks
internal-splined plates 4 to external-tanged plates 5, and,
in turn, to clutch housing 14.
(3)
Since center sun gear and shaft assembly
23 (B, foldout 12 or A and B, foldout 13) is splined to the
clutch housing, it will also rotate at input speed.
2-13.
SECOND, THIRD CLUTCHES, AND CENTER
SUPPORT
(A, foldout 12)
a. Function Differs Among Models
(2)
The second and third clutches perform
only one function.
When engaged with forward clutch,
the second clutch produces third gear, while the third
clutch produces fourth gear.
b. Description
(1) The second and third clutches
are composed of two identical pistons, twenty-one clutch
plates (13 in second clutch; 8 in third clutch) and a center
support.
(2)
Two pistons 10 and 21 are positioned
back-to-back in the bores of center support housing
assembly 16.
Each piston is retained in its bore by
twenty piston return springs 9 or 22, a return spring
retainer 8 or 23, four self-locking retainer rings 7 or 24
and snap-rings 5 or 25.
(3)
Eight clutch plates are required for the
third clutch (four internal-splined and four external-
tanged plates).
The internal-splined plates are attached
to the outside diameter of the fourth clutch housing and
are free to rotate.
The external-tanged plates are
anchored to the transmission housing and cannot rotate.
682
TRANSMISSION
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