Inhibitor Prevents 2-1 Downshift at Excessive Speed

operation of the transmission during the period the

a. Inhibitor Prevents 2-1 Downshift at Excessive

vehicle is moving at excessive speed.

(3) When vehicle speed decreases, G2 pressure

( 1 ) Figure 2-10 illustrates the hydraulic

also decreases. When G2 pressure falls to a value

in intermediate-range

operation

even

System

which will no longer hold the low-intermediate shift

though the manual selector has been moved to a

p l u g , valve, and blocker plug upward against

position which does not indicate intermediate-range

spring force and inhibitor pressure, the downshift

o p e r a t i o n . This condition results when vehicle

to low range will occur. This is an automatic shift,

(transmission output) speed is too great for safe

which lags behind the manual shift.

o p e r a t i o n in low range at the time a manual

b. O t h e r F u n c t i o n s S a m e a s L o w - R a n g e

downshift is made.

operation (fig. 2-10). In intermediate-range

(2) When the manual downshift is made, rear

operation (selector at 1-position), the circuits not

governor (G2) pressure is sufficient to continue

involved in action of the intermediate-low inhibitor

holding the low-intermediate shift plug, shift valve,

operate as described in paragraph 2-15 for low-

and blocker plug upward against spring force and

range operation.

inhibitor pressure. This extends intermediate-range

2-25