Case 580SR Service Manual page 82

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16
TRANSMISSION OIL FLOW THROUGH SOLENOID VALVE
The forward (1) or reverse (2) solenoid valves fitted
at the top of the transmission housing control the oil
flow to the forward and/or reverse clutch packs in the
transmission.
On the underside of the solenoid valve are the 4
ports for directional oil flow to and from the solenoid
valve.
1. Oil supply from the valve to the forward clutch
pack
2. Return oil to tank
3. Oil supply from the valve to the reverse clutch
pack
4. Oil supply from the pump into the valve
5. Locating pin
When the powershuttle lever in the cab is in neutral
position the solenoid valve spool (1) will be static and
oil (2) will not flow into either reverse (3) or forward
(4) clutch pack oil gallery.
When forward direction is selected on the power-
shuttle lever the solenoid valve spool (1) will move to
the left (as shown) and the oil (2) will flow into the for-
ward clutch pack oil gallery (4).
When reverse direction is selected on the power-
shuttle lever the solenoid valve spool (1) will move to
the right (not shown) and the oil (2) will flow into the
reverse clutch pack oil gallery (3).
SECTION 21 - TRANSMISSION
1 2
4
3
1 2
4 3
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