777E and 777F Off-Highway Truck Power Train Caterpillar


Specifications (Power Train)

Usage:

777F JRP

Specifications for the Torque Converter

Outlet Relief Valve

Outlet pressure for the torque converter at stall speed with dry brakes ... 552 ± 34 kPa (80 ± 5 psi)

Pressure setting at pressure tap in chassis with wet brakes ... 758 ± 70 kPa (110 ± 10 psi)

Pressure setting at pressure tap in chassis with dry brakes ... 552 ± 70 kPa (80 ± 10 psi)

Flow rate ... 132.5 ± 0.8 L/min (35.0 ± 0.2 US gpm)

Outlet pressure for the torque converter at stall speed with oil cooled brakes ... 758 ± 34 kPa (110 ± 5 psi)

Torque converter outlet pressure at stall speed ... 552 ± 34 kPa (80 ± 5 psi)

Table 1
Spacer Chart for the Outlet Relief Valve    
Pt. No. for the Spacers     Thickness of the Spacers     Pressure Change from one Spacer    
5M-9624 Spacer    
0.25 mm (0.010 inch)    

5 kPa (0.7 psi)    
5M-9623 Spacer    
0.90 mm (0.035 inch)    

18 kPa (2.6 psi)    

Inlet Relief Valve

Torque converter inlet pressure ... 930 ± 35 kPa (135 ± 5 psi)

Table 2
Spacer Chart for the Inlet Relief Valve    
Pt. No. for the Spacers     Thickness of the Spacers     Pressure Change from one Spacer    
5M-9624 Spacer    
0.25 mm (0.010 inch)    

14 kPa (2.0 psi)    
5M-9623 Spacer    
0.90 mm (0.035 inch)    

50 kPa (7.3 psi)    

Transmission

Table 3
Speed     Engaged Clutches     Torque Converter Drive     Direct Drive (1)    
NEUTRAL     1     X     -    
REVERSE     1 and 7     X     -    
FIRST Speed     2 and 6     X     X    
SECOND Speed     1 and 6     -     X    
THIRD Speed     3 and 6     -     X    
FOURTH Speed     1 and 5     -     X    
FIFTH Speed     3 and 5     -     X    
SIXTH Speed     1 and 4     -     X    
SEVENTH Speed     3 and 4     -     X    
( 1 ) The lockup clutch is engaged.

Table 4
Transmission Shift Points (1)    
Upshift     Standard     Retarder    
1C to 1L (2) (3)     -     -    
1L to 2     1820 ± 30     2020    
2 to 3     1820 ± 30     2020    
3 to 4     1820 ± 30     2020    
4 to 5     1820 ± 30     2020    
5 to 6     1820 ± 30     2020    
6 to 7     1820 ± 30     2020    
Downshift     Standard     Retarder    
7 to 6     1260 ± 20     1420    
6 to 5     1260 ± 20     1420    
5 to 4     1260 ± 20     1420    
4 to 3     1260 ± 20     1420    
3 to 2     1260 ± 20     1420    
2 to 1L     1260 ± 20     1420    
1L to 1C     1260 ± 20     -    
( 1 ) The listed engine speeds are nominal engine speeds.
( 2 ) (C) Torque converter drive
( 3 ) Direct drive (lockup clutch engaged).

Transmission Oil Pressure

Transmission lubrication pressure at high idle ... 110.31616 ± 27.57904 kPa (16 ± 4 psi)

Transmission lubrication pressure at low idle ... 22.4 ± 19 kPa (3.25 ± 2.75 psi)

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