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Home > Ordnance Documents and other related manuals > > Figure 1-55. lockup Clutch Cutoff Circuit.
Figure 1-54. Lockup Shift Circuit.
Service Brake Circuit - Continued - OD1710A0061

Introduction to the X1100-3B Transmission, M1A1 Abrams Tank
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h. Lockup Clutch Cutoff Circuit (fig. 1-55).  Applying either the
first, second, third, or fourth clutch sends pressure to the lockup
cutoff valves.  In the first range, this pressure pushes the valve up
and allows pressure to charge the lockup feed line.  Lockup occurs in
the first range when the turbine speed governor (G1) is high enough.
When  the  transmission  shifts  to  the  second  range,  first  clutch
pressure exhausts to the reservoir and releases the lockup clutch.
Second  clutch  apply  pressure  pushes  (through  an  orifice)  on  the
opposite end of the 1-1 cutoff valve to reapply the lockup clutch.
However, oil initially flowing through the orifice in the 1-2 cutoff
valve delays application of the lockup clutch.
The release of the lockup and delay in reapplication of the lockup
allows smoother shifts.
Similar actions of the lockup clutch cutoff valves occur at the 2-3
and 3-4 cutoff valves when releasing the second and third clutches.
In downshifts, similar operations occur, but in a reverse order.
Figure 1-55.
Lockup Clutch Cutoff Circuit.
i. Service Brake Circuit.
Several valves in the service brake
circuit  function  during  braking  operation  to  influence  pressures,
flow,  etc.
The  following  paragraphs  discuss  each  valve  as  it
functions in forward and reverse operations, brakes released (OFF)
and brakes applied (ON).
54
OD1710






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