SPOOL AS-SELECTOR 2P7030 - Caterpillar

Illustration 1 g03452857
(1) Transmission ECM (Electronic Control Module)
(2) Cat Data Link
(3) Modulating valve for clutch 4 ("FIRST SPEED ")
(4) Modulating valve for clutch 5 ("SECOND SPEED")
(5) Modulating valve for clutch 6 ("THIRD SPEED")
(6) Modulating valve for clutch 1 ("FORWARD HIGH")
(7) Modulating valve for clutch 2 ("REVERSE" )
(8) Modulating valve for clutch 3 ("FORWARD LOW ")
(9) Starter Relay
(10) Secondary Steering Pump Relay
(11) Rear Window Defroster Relay
(12) Implement Detent Relay
(13) Implement Detent Solenoid
(14) Backup Alarm Relay
(15) Backup Alarm
(16) CAN Data Link
(17) Dash Panel Cluster
(18) Engine ECM (Electronic Control Module)
(19) Gateway ECM (Electronic Control Module)
(20) PL421 ECM (Optional)
(21) Diagnostic Connector
(22) Ride Control Solenoid (Optional)
(23) Engine Fan Solenoid
(24) Implement Lockout Solenoid Relays
Engine Start Relay
In order to engage the engine start relay, the following conditions must be met.
The direction switch is set to NEUTRAL position.
The keyswitch is turned to START position.
Engine speed has not been above 550 RPM for 10 seconds.
ECM has completed the sequence for start-up .
System voltage is below 32V.Ride Control (if equipped)
The Transmission ECM activates the ride control when the ride control switch is placed in the ON position. The activation is based on the machine ground speed in the AUTO position. The ride control system diminishes the effects of a loaded bucket when the machine moves at higher speeds.Backup Alarm
The backup alarm (15) will be turned ON by the Transmission ECM whenever the direction switch is set to reverse.Modulating Valves
Illustration 2 g03455371
(25) Solenoid
(26) Modulating Valve The modulating valves are used to regulate the oil flow to the clutches in the transmission. When a direction and speed are selected by the operator, the Transmission ECM (1) activates the solenoid (25) on the appropriate modulating valves (26). Two solenoids must be activated for movement of the machine. One solenoid is for the direction and one solenoid is for the speed. When an operator selects a direction and speed, the solenoid receives a signal from the Transmission ECM. The Transmission ECM adjusts the signal to the solenoid in order to adjust the flow of oil to the transmission clutches from the modulating valve.The machine is equipped with the following modulating valves:
Modulating valve for clutch 1 (6) (forward high)
Modulating valve for clutch 2 (7) (reverse)
Modulating valve for clutch 3 (8) (forward low)
Modulating valve for clutch 4 (3) (first speed)
Modulating valve for clutch 5 (4) (second speed)
Modulating valve for clutch 6 (5) (third speed)Other Outputs
The Transmission ECM (1) also sends information to the Engine ECM (18) via the Cat Data Link (2). The Transmission ECM (1) also sends information to the Dash Panel Cluster (17) from the Engine ECM and the Service Connector (21) via the Cat Data Link (2).