RING-RETAINING 1T0294 - Caterpillar

TH48-E80 Petroleum Transmission
Table 1
Control Pressures
Port Location(1) Pressure Tap
3 Transmission supply pressure
4 SOS sampling (transmission oil inlet)
6 Lockup clutch pressure
7 Torque converter inlet pressure
8 Torque converter outlet pressure
9 Planetary lubrication pressure
22 Planetary lubrication pressure(2)
41 Downshift solenoid pressure
42 Upshift solenoid pressure
43 PTO lubrication (transmission supply pressure)
56 Clutch 5
58 Clutch 6
59 Clutch 3
60 Clutch 4
62 Clutch 2
63 Clutch 1
(1) Refer to the following Illustrations for the location of each test port.
(2) Test port number 9 is the preferred location for checking the planetary lubrication pressure.Note: Refer to Illustrations 1, 2, 3, 4, and 5 for the location of the pressure taps shown in Table 1.
Illustration 1 g02846799
Right side view
(1) Pressure control valve
(2) Control inspection cover
(3) Test port (transmission supply pressure)
(4) Test port (SOS Sample)
(5) Torque converter output speed sensor access cover
(6) Test port (lockup clutch pressure)
(7) Test port (torque converter inlet pressure)
(8) Test port (torque converter outlet pressure)
(9) Test port (speed increaser lubrication)
(10) Torque converter inlet relief valve
(11) Torque converter control group
(12) Lubrication relief valve
(13) Torque converter outlet relief valve
(15) Inspection cover for the suction screen (transmission and torque converter pump)
(16) Kidney loop connector (1 1/4 inch) pipe drain plug
(17) PTO mount (SAE J704 8 bolt mount, CW rotation, speed ratio 1.22:1)
(18) Pump outlet to the transmis