RING-RETAINING 1570687 - Caterpillar

Table 1
CX48-P2300 Valve History
Control Group 8 Speed No Warm up Feature 7 Speed with Warm-up Feature
258-8741 314-9942
Valve Group 261-3372 367-2223 314-9940 367-2233
Serial Numbers 1-845 846-Up 1-845 846-Up
Pressure Control Valve 261-3378 367-2179 261-3378 367-2179
Selector Valve 261-3383 375-5500 314-9930 375-5499
Manifold 261-3377 261-3377 261-3377 261-3377 Note: The valve group for serial numbers 1-845 will be identical to the valve group for serial numbers 846 and up after updating per service magazine SEPD1360.Note: The valve group was updated to reduce clutch power and energy during the shift and increase shift speed to reduce transmission output speed drop during shifting.
Illustration 1 g03147420
Top view of the transmission hydraulic control
(1) Transmission lubrication relief valve
(2) Pressure control valve
(3) Manifold
(4) Selector and pressure control valve
(5) Downshift solenoid
(6) Upshift solenoid
(7) Rotary actuator
Illustration 2 g03111997
Side view of the transmission hydraulic control
(1) Transmission lubrication relief valve
(2) Pressure control valve
(3) Manifold
(4) Selector and pressure control valve
(5) Downshift solenoid
(6) Upshift solenoid
(7) Rotary actuator
(8) Manifold
Table 2
Operation Of Components In The Transmission Hydraulic Control
Component Operation (Function)
Transmission lubrication relief valve (1) This relief valve controls the pressure of the lubrication oil to the transmission.
Pressure control valve (2) This valve controls oil flow, the rate of pressure increase and the rate of pressure decrease, and oil pressure in the clutches.
Manifold (3) This manifold sends pump oil to rotary actuator (7).
Selector and pressure control valve (4) This valve controls system pressure and the amount and direction of pilot pressure oil that is sent to pressure control valve (2).
Downshift solenoid (5) This solenoid controls the movement of rotary actuator (7) during downshifts.
Upshift solenoid (6) This solenoid controls the movement of rotary actuator (7) during upshifts.
Rotary actuator (7) This actuator controls movement of the rotary selector spool in selector and pressure control valve (4).
Manifold (8) This manifold sends oil to the clutches.