SEGMENT 8P5837 - Caterpillar

Illustration 1 g06179300
(1) Filter inlet pressure coupler
(2) Clutch 5 (C5) pressure coupler
(3) C4 pressure coupler
(4) Filter outlet pressure (S.O.S) pressure coupler
Illustration 2 g06179286
Typical example of a CX35–P800 Petroleum Transmission (shown without integral pump drives)
(5) Lockup clutch pressure coupler
(6) C1 pressure coupler
(7) C2 pressure coupler
(8) C3 pressure coupler
(9) C6 pressure coupler
(10) Converter inlet pressure coupler
(11) Transmission lubrication pressure coupler
(12) Converter outlet pressure coupler
Table 1
CX38–P892 Power Train Pressures(1)
Pressure Tap Pressure
(1) Clutch one 1100 140 kPa (160 20 psi)
3000 140 kPa (435 20 psi) (Reverse)
(2) Clutch two 3000 140 kPa (435 20 psi)
(3) Clutch three 2600 140 kPa (380 20 psi)
(4) Clutch four 3000 140 kPa (435 20 psi)
(5) Clutch five 3000 140 kPa (435 20 psi)
(6) Clutch six 2140 140 kPa (310 20 psi)
Warm-up mode 2800 140 kPa (410 20 psi)
(LUC) Torque Converter Lockup Clutch 1786 140 kPa (260 20 psi)
(MRV) Transmission Main relief valve 3160 140 kPa (460 20 psi)
(1) The variable main relief valve will alter transmission pump/main relief pressure between 860 kPa (125 psi) and 3450 kPa (500 psi) depending on gear, speed, and load. The purpose of this strategy is to maximize fuel economy by limiting pumping loss. Pressure is set to ~ 3160 kPa (460 psi) in Converter Drive and varies continuously in direct drive. In Neutral, pressure will drop for fuel savings.
Table 2
CX38–P892 Power Train Pressures - Transmission in Neutral
Pressure Tap Pressure at High Idle Pressure at Low Idle
(TI) Torque Converter Inlet Relief Valve 860 140 kPa (125 20 psi) 245 140 kPa (36 20 psi)
(LB) Transmission Lube Pressure 215 35 kPa (31 5 psi) 135 35 kPa (20 5 psi)
(TO) Torque Converter Outlet Relief Valve 500 70 kPa (73 10 psi) 190 70 kPa (28 10 psi)
Table 3
Speed Selection Clutch Engagement
Clutch 1 Clutch 2 Clutch 3 Clutch 4 Clutch 5 Clutch 6 LUC
1C X X X
2L X X X X
3L X X X X
4L X X X X
5L X X X X
6L X X X X
7L X X X X
8L X X X X
9L X X X X
1RC X X X
2RC X X X
N X X