SEAL 6J5541 - Caterpillar

Note: All transmission control valves, 314-9930, 261-3383, and 261-3378 should be modified per Service Magazine, SEPD1360, "Hydraulic Control Modifications for TH48-E80 Petroleum Transmission and SPF343C Pumper Transmission {3074, 3083, 3167}".
Table 1
TH48-E80 ICM 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.
Table 2
Required Tools
Part Number Description Qty
198-4240 Digital Pressure Indicator 1
3B-6552 Elbow 1
6V-4140 Unvalved Nipple 1
3B-7282 Pipe Nipple 1
6V-6064 Transmission Test Cover(1) 1
FT1775 Transmission Test Cover(1) 1
(1) Only one type of transmission test cover is necessary.Note: Make sure that the filters and the screens are clean before you test any pressures. Make sure that the oil is at operating temperature before you perform this test.
Personal injury or death can result from sudden machine movement.Sudden movement of the machine or release of air pressure or oil pressure can cause injury to persons on or near the machine.To help prevent possible injury before testing and adjusting any air system or hydraulic system, perform the procedure in the Testing and Adjusting, "General Information" section.
This test will determine if the operation of the priority reduction valve and the setting of the priority reduction valve are correct.Procedure
Disconnect the wiring harness from the lockup clutch solenoid, the downshift solenoid, and the upshift solenoid.
Illustration 1 g01225288
Illustration 2 g01225289
Remove solenoid guard (1) and large cover (2) from the transmission case.
Illustration 3 g01225290
Remove plug (3) from the pilot pressure tap.
Illustration 4 g01225291
Install 3B-6552 Elbow ( 0.125 mm (0.005 inch) NPT) (6) in the pilot pressure tap. Connect 3B-7282 Pipe Nipple ( 0.125 mm (0.005 inch) NPT) ( 152 mm (6 inch) long) (5) with a 6V-4142 Unvalved Nipple (4) to the elbow.
Illustration 5 g01225297
Put 4C-4897 Cover (7) on the top of the transmission case. Use a piece of plastic or a piece of paper with the cover to prevent dirt from entering the transmission case and to prevent the spraying of oil. Alternate Step 5. Install the FT1775 Transmission Test Cover in place of the large cover. Use four bolts that are evenly spaced in order to hold the cover in place.
Connect 198-4240 Digital Pressure Indicator to the nipple at the pilot pressure tap.
Start the engine. Run the engine at the low idle rpm with the transmission in NEUTRAL.
For 261-3383 Selector and Pressure Control Valves and 314-9930 Selector and Pressure Control Valves prior to updating per SEPD1360, the pressure on the gauge must be 1755 35 kPa (255 5 psi).