BOLT 7J5586 - 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
4C-4897 Transmission Test Cover(1) 1
6V-9509 Face Seal Plug 1
6V-9830 Cap 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.Note: Do not adjust the clutch stations to this pressure. Clutch stations should be adjusted in order to attain the correct primary pressure. If the primary clutch pressure is correct and the maximum clutch pressure is not correct, check the components for the correct part numbers and for the correct installation. The primary clutch pressure must be correct. Refer to Testing and Adjusting, "Primary Clutch Pressure for Transmission Hydraulic Control - Test and Adjust" for additional information.This test will determine if the following conditions exist:
The transmission clutch pressures are correct.
There is too much oil leakage in a clutch.
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.
Procedure
Illustration 1 g03106002
Installation of the pressure indicator
(1) Pressure tap for the pilot oil of the transmission hydraulic control
(A) Pressure tap for the No. 4 clutch
(B) Pressure tap for the No. 2 clutch
(C) Pressure tap for the No. 1 clutch
(D) This pressure tap is not used.
(E) Pressure tap for the No. 5 clutch
(F) This pressure tap is not used.
(G) Pressure tap for the No. 6 clutch
(H) Pressure tap for the No. 3 clutch Note: If an FT1775 Transmission Test Cover is used, a gauge can be installed at pressure tap (1) in order to check the pilot pressure. If a 4C-4897 Transmission Test Cover is used, be certain that the plug is installed at pressure tap (1).
Disconnect the electrical harness from the lockup clutch solenoid. Note: Disconnecting the lockup clutch solenoid will allow testing the clutch pressures in a direct drive