Introducing the Jatco 6-Speed
duty cycle on-time, the lower the pres- sure (figure 5). When the normally low solenoids
are off, pilot pressure is blocked at the solenoid valve. When they’re ener- gized, pilot pressure moves the control valve against the return spring, allow- ing line pressure to apply the clutch. The longer the duty cycle on-time, the higher the pressure (figure 6). The two on-off solenoids are ener-
gized by supplying system voltage. This blocks pilot pressure at the sole-
noid, shutting off pressure to the con- trol valve (figure 7). There are also five normally open
pressure switches (figure 3): • Low Clutch • Low/Reverse Brake Clutch • 2-6 Brake Clutch • 3-5 Reverse Clutch • High Clutch
The TCM uses the signals from
these switches to monitor the apply pressure of the designated clutch.
Well that’s about all for this article.
Look for more information on the not- so-new Jatco JF613E in future articles and seminars.
Figure 6
Figure 7 18 GEARS January/February 2012
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