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Home > Ordnance Documents and other related manuals > > Forward Clutch and Range Input Gear
Figure 1-12. Input Gears.
The Third Clutch

Introduction to the X1100-3B Transmission, M1A1 Abrams Tank
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e. Forward Clutch and Range Input Gear (fig. 1-13).  The forward
clutch pack has a multiple function.  Engaging the forward and first
clutches  simultaneously  produces  the  first  range.
Engaging  the
forward and the second, third, or fourth clutches at the same time
produces the second, third, or fourth ranges, respectively.
The forward clutch contains a clutch housing, external-tanged and
internal-tanged clutch plates, piston, and forward clutch and fourth
clutch driving hub.
The clutch housing has an oil collector ring attached to its inner
diameter  that  works  with  a  pitot  tube to  produce  front  governor
pressure (G1).  The clutch housing contains the forward clutch piston
positioned inside the housing bore and retained by the piston return
springs, a spring retainer, and snap-ring.
Through the use of splines, the internal-splined clutch plates attach
to the forward clutch hub, and the  external-tanged clutch plates
anchor against the internal grooves of the forward clutch housing.
The  forward  clutch  housing  rotates  when  the  converter  turbine
rotates.
Additionally, the fourth clutch drive hub rotates causing
the internal-splined plates of the fourth clutch pack to rotate.
Directing hydraulic pressure to the back of the forward clutch piston
causes the clutch plates to compress and locks the forward clutch hub
to the forward housing.
Since the hub has splines attaching it to
the  transmission  main  shaft,  the  shaft  rotates  the  hub  at  input
speed.
To produce one forward or reverse range, two clutches must be applied
together.  The transmission applies the forward clutch in the forward
ranges only.
Rotation of the oil (pitot) collector ring directs oil against the
pitot  tube  anytime  the  converter  turbine  rotates;  therefore,  an
increase in turbine pressure produces a proportional increase in the
front governor pressure.
f. The  Fourth  Clutch  (fig.  1-13).
This  clutch  has  a  dual
function.
When engaged with the forward clutch, the two clutches
produce the fourth range.  When this clutch engages with the first or
second clutch, they produce one of the two reverse ranges.
This  clutch  contains  external-splined  and  internal-tanged  clutch
plates, a piston positioned inside the housing bore and retained by
the piston return springs, a spring retainer and snap-ring.
17
OD1710






Western Governors University

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