SHAFT-TRANSMISSION 4K5098 - Caterpillar

Petroleum Transmission
Note: Cat transmissions are manufactured, assembled, and tested using hydraulic diagnostic couplers. These quick disconnect couplers for checking system pressures, remain on the transmission for the convenience of the owners and service personnel. Unless otherwise stated, all quick disconnect couplers conform to "SAE J1502" standards.
Table 1
TH55-E70 and TH55-E90 Power Train Pressures
Pressure Taps Description
3 Lubrication pressure(1)
4(2) Torque Converter Inlet (optional)
5 Main Supply
6 Clutch 6
7 Clutch 5
8 Clutch 4
9 Clutch 3
10 Clutch 2
11 Clutch 1
12 Torque converter inlet
13 Lockup clutch
14 SOS sampling port (transmission controls)
15 Pump pressure port (controls)
16 SOS sampling port (torque converter)
17 Pump pressure port (torque converter)
50 Lubrication pressure(1)
(1) The proper location to check the lubrication pressure is at pressure tap (3).
(2) Optional test port (not present on all units)Note: Refer to illustrations 1, 2, and 3 for the location of the pressure taps that are listed in Table 1.
Illustration 1 g02833481
Right side view
(3) Lube pressure coupler
(4) Torque converter inlet (optional)
(5) Test Port (transmission supply pressure)
(6) Test Port (clutch 6 pressure)
(7) Test Port (clutch 5 pressure)
(8) Test Port (clutch 4 pressure)
(9) Test Port (clutch 3 pressure)
(10) Test Port (clutch 2 pressure)
(11) Test Port (clutch 1 pressure)
(12) Converter inlet pressure coupler
(13) Lockup clutch pressure coupler
(18) Rear transmission mounts and lifting eyes
(19) Converter housing lifting plate
(21) Cooler return port (SAE-32)
(22) Engine output speed sensor (sensor is connected by the customer)
(23) TIS (transmission input sensor) service cover
(24) Breather and oil fill location
(25) Filter bypass switch
(26) Oil pump outlet through oil filters to controls
(27) Oil pump outlet through oil filter to torque converter inlet
(28) Flywheel housing adapter
(30) Torque converter
(31) PTO mount (SAE J704 8 bolt mount, CW rotation, speed ratio 0.91:1)
(32) Torque converter inlet (from oil filter group and controls)
(33) Torque converter inlet relief valve
(34) Torque converter output speed sensor
(35) Transmission output speed sensor (provided for customer use)
(46) Kidney loop connection port (one of three) (SAE J1926 #16 port, 1 5/16 - 12 straight thread o-ring)
Illustration 2 g02157738
Left side view
(2) Serial number plate
(36) Oil pump suction line
(37) PTOs SAE "C" J744 14 teeth splines (CCW rotation, two and four bolt pump mounts), speed ratio 1.21:1
(38) Torque converter temperature sensor
(39) Customer interface connector (40 pin receptacle)
(40) Diagnostic connector
(41) Connector for Produck Link remote monitoring
(42) Electronic control module
(43) Transmission control tower
(44) Transmission output speed sensor
(45) Output flange (GWB 390.65 (2500 hp) or GWB 390.70 (3000 hp))
(46) Kidney loop connection port (one of three) (SAE J1926 #16 port, 1 5/16 - 12 straight thread O-ring)
(47) Sump heater port SAE J1926 #32 port (2 1/2 - 12 - straight thread O-ring) (appropriate location for transmission oil heater)
(48) Oil level sight gauge
(49) Lube relief valve inlet from oil cooler (SAE-32 coupling)
(50) Lubrication pressure port
(51) Suction Screen Cover (requires a 330 mm (13 inch) clearance)
(52) Torque converter outlet to oil cooler (SAE-32)
Illustration 3 g02833997
Right side view
(14) SOS sampling port (transmission controls)
(15) Pump pressure port (transmission)
(16) SOS sampling port (torque converter)
(17) Pump pressure port (torque converter)
(20) Base supports
(33) Torque converter inlet relief valve
(46) Kidney loop connection port (one of three) (SAE J1926 #16 port, 1 5/16 - 12 straight thread O-ring)
(53) Transmission