90-830234R3 DECEMBER 1997 MID-SECTION - 5E-11
Under Water Strike With Valves Open
Should the drive unit strike a submerged object while
in forward motion, the shock rod (a) will extend from
the tilt cylinder (l). Fluid will attempt to exit the cylinder
through the interconnecting passage. The rapid fluid
flow will increase the pressure below the surge valve
(k), causing the valve to move, closing the oil return
passage back into the accumulator (c). Oil inside the
up cavity is locked in a static position by the closed
up fast transfer valve (j), the closed down slow trans-
fer valve (i) and down fast transfer valve (h). As the
shock rod extends outward, the pressure inside the
up cavity will reach sufficient pressure to open the
shock valve (p) which opens at 880-1110 psi. Oil will
flow into the cavity created as the shock rod & shock
piston (a & n) moves away from the memory piston
(m).
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