SkyTrak 8042 Service Manual - Manual (Page 820)

9.229 Model 8042, 10042, 10054 Legacy Rev. 10/03
Electrical System
9.14.7 Transmission Solenoid Valves
The transmission is shifted via six solenoids. Three
solenoid valves (Y1, Y2 and Y3) are contained in an
UPPER spool-type solenoid cartridge assembly (valve
body) (6).
The remaining three solenoid valves (Y4, Y5 and Y6) are
contained in the LOWER spool-type solenoid cartridge
assembly (valve body) (7). While each 12-volt solenoid
coil at the transmission is the same, the internal wiring to
the solenoids is different and connected so that the
various transmission clutches can be actuated via input
from the transmission shift control switch (travel select
lever).
By placing the transmission shift control switch (travel
select lever) in any given position, a combination of
solenoids are activated, which, in turn, engage a
combination of internal clutches. (Refer to Section 9.14.7,
a. “Travel Select Lever and Wiring Harness Testing,” and
Section 9.14.7, b. “Upper and Lower Transmission Valve
Body Solenoid Testing.”)
If the transmission is not shifting properly, the
transmission shift control switch (travel select lever),
wiring harness or transmission shift solenoids should be
checked in order to determine which component is
defective. Specific information to determine which travel
position and corresponding component is not responding
can be found by referring to the circuit diagrams in
Section 9.8, “Transmission Gear Selection
Troubleshooting,”. Replace a defective component.
MA7720
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