793B Off-Highway Truck Power Train Caterpillar


Specifications (Power Train)

Usage:

793B 1HL

Table 1
Shift Points At Nominal Engine Speed    
Upshift     Engine Speed     Transmission Output Speed    
1C to 1L     1710 ± 50     366    
1L to 2     1855 ± 30     494    
2 to 3     1855 ± 30     667    
3 to 4     1840 ± 30     904    
4 to 5     1840 ± 30     1221    
5 to 6     1840 ± 30     1657    
           
Downshift     Engine Speed     Transmission Output Speed    
6 to 5     1290 ± 30     1569    
5 to 4     1290 ± 30     1161    
4 to 3     1290 ± 30     856    
3 to 2     1290 ± 30     634    
2 to 1L     1300 ± 30     468    
1L to 1C     1262 ± 30     336    

Specifications for the Torque Converter

Outlet Relief Valve

Pressure setting for the outlet relief valve ... 345 ± 15 kPa (50 ± 2 psi)

Torque converter outlet pressure at stall speed ... 345 to 552 kPa (50 to 80 psi)

Torque converter stall speed at operating temperature ... 1672 ± 50 rpm

Table 2
Spacer Chart for the Outlet Relief Valve    
Pt. No. for the Spacers     Thickness of the Spacers     Change in Pressure as a result of one Spacer    
5M-9624 Spacer    
.25 mm (0.01 inch)    

5 kPa (0.73 psi)    
5M-9623 Spacer    
.90 mm (0.035 inch)    

18 kPa (2.61 psi)    

Inlet Relief Valve

Pressure setting for the inlet relief valve ... 930 ± 35 kPa (135 ± 5 psi)

Table 3
Spacer Chart for the Inlet Relief Valve    
Pt. No. for the Spacers     Thickness of the Spacers     Change in Pressure as a result of one Spacer    
5M-9624 Spacer    
.25 mm (0.01 inch)    

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

49 kPa (7.1 psi)    

Torque Converter Oil Filter

Pressure setting for the bypass valve ... 140 kPa (20 psi)

Torque Converter and Front Brake Cooling Screen

Pressure setting for the bypass valve ... 125 ± 30 kPa (18 ± 4 psi)

Parking and Secondary Brake Valve

Parking brake release pressure at high idle ... 4100 ± 200 kPa (595 ± 29 psi)

Parking Brake Release Oil Filter

Pressure setting for the bypass valve ... 248 ± 21 kPa (36 ± 3 psi)

Lockup Clutch and Synchronizing Valve

Pressure Reduction Valve

Pilot pressure at low idle ... 1725 ± 70 kPa (250 ± 10 psi)

Table 4
Chart of Shims for the Pressure Reduction Valve    
Pt. No. for the Shims     Thickness of the Shims     Change in Primary Pressure as a result of one Shim    
5J-2721 Shim    
.13 mm (0.005 inch)    

13 kPa (2.0 psi)    
6J-3993 Shim    
.25 mm (0.01 inch)    

26 kPa (4.0 psi)    
5J-1036 Shim    
.80 mm (0.031 inch)    

81 kPa (12.0 psi)    

Modulation Reduction Valve

Maximum torque converter lockup clutch pressure at low idle setting ... 2135 ± 70 kPa (310 ± 10 psi)

Primary torque converter lockup clutch pressure at low idle ... 1030 ± 35 kPa (150 ± 5 psi)

Table 5
Chart of Shims for the Modulation Reduction Valve (1)    
Pt. No. for the Shims     Thickness of the Shims     Change in Primary Pressure as a result of one Shim    
8J-4452 Shim    
.12 mm (0.005 inch)    

33 kPa (5.0 psi)    
2S-0675 Spacer    
.40 mm (0.016 inch)    

77 kPa (11.0 psi)    
9J-1330 Shim    
.79 mm (0.031 inch)    

143 kPa (21.0 psi)    
( 1 ) Before an adjustment is performed, be certain that the valve springs are not weak or broken.

Table 6
Speed     Engaged Clutches     Torque Converter Drive     Direct Drive (Engaged Lockup Clutch)    
Neutral-1     3     X     -    
Neutral-2     1     X     -    
Reverse     1 and 6     X     -    
First Gear     1 and 5     X     -    
Second Gear     2 and 5     -     X    
Third Gear     1 and 4     -     X    
Fourth Gear     2 and 4     -     X    
Fifth Gear     1 and 3     -     X    
Sixth Gear     2 and 3     -     X    

Transmission

Pressure Control Valve

Table 7
Station (1)     A     B     C     (2)     E     F     G    
Engaged Clutch     2     1     3         4     5     6    
Type of Test     Pressure    
Clutch Pressure At High Idle In Torque Converter Drive        
2890 kPa (419 psi) (3)    

2470 kPa (358 psi) (4)    
       
2720 kPa (395 psi) (4)    

2805 kPa (407 psi) (4)    
Clutch Pressure At Low Idle In Torque Converter Drive (4)        
2760 kPa (400 psi)    
           
2585 kPa (375 psi) (4)    

2760 kPa (400 psi) (4)    
Clutch Pressure At High Idle In Direct Drive (4)    
2020 kPa (293 psi)    

2020 kPa (293 psi)    

2020 kPa (293 psi)    
   
2020 kPa (293 psi)    

2020 kPa (293 psi)    
   
Primary Clutch Pressure At Low Idle (7)    
525 kPa (76 psi)    

475 kPa (69 psi)    

480 kPa (70 psi)    
   
425 kPa (62 psi)    

450 kPa (65 psi)    

425 kPa (62 psi)    
( 1 ) Station "H" is not used.
( 2 ) Station "D" does not control a clutch. Station "D" controls the dual stage relief valve for the system pressure.
( 3 ) The tolerance is ± 225 kPa (± 33 psi).
( 4 ) The tolerance is + 240 - 100 kPa (+ 35 - 15 psi).
( 7 ) The tolerance is + 50 - 35 kPa (+ 7 - 5 psi).

Table 8
Shims for the Pressure Control Valve
Pressure Change per Shim (1)    
Station (1)     A     B     C     (2)     E     F     G    
Engaged
Clutch    
2     1     3     -     4     5     6    
Thickness of Shim     Pressure Change     Pressure Change     Pressure Change     Pressure Change     Pressure Change     Pressure Change     Pressure Change    
5J-2721 Shim    

0.13 mm (0.005 inch)    

20 kPa (2.9 psi)    

17 kPa (2.4 psi)    

20 kPa (2.9 psi)    

12 kPa (1.7 psi)    

17 kPa (2.5 psi)    

19 kPa (2.7 psi)    

19 kPa (2.8 psi)    
6J-3993 Shim    

0.25 mm (0.010 inch)    

41 kPa (5.9 psi)    

33 kPa (4.8 psi)    

41 kPa (5.9 psi)    

25 kPa (3.6 psi)    

35 kPa (5.1 psi)    

37 kPa (5.4 psi)    

39 kPa (5.6 psi)    
4M-1751 Spacer    

0.41 mm (0.016 inch)    

65 kPa (9.4 psi)    

53 kPa (7.7 psi)    

65 kPa (9.4 psi)    

39 kPa (5.7 psi)    

56 kPa (8.1 psi)    

59 kPa (8.6 psi)    

62 kPa (9.0 psi)    
5J-1036 Shim    

0.80 mm (0.031 inch)    

125 kPa (18.2 psi)    

103 kPa (15.0 psi)    

125 kPa (18.2 psi)    

76 kPa (11.0 psi)    

109 kPa (15.8 psi)    

114 kPa (16.6 psi)    

120 kPa (17.4 psi)    
( 1 ) Station "H" is not used.
( 2 ) Station "D" does not control a clutch. Station "D" controls the dual stage relief valve for the system pressure.

Table 9
Specifications and Identification of the Components of the Pressure Control Valve    
Location of the Load Piston Body (1)     A     B     C     D     E     F     G    
Thickness of the Load Piston Orifice    
4.58 mm (.180 inch)    

2.54 mm (.100 inch)    

2.54 mm (.100 inch)    
   
2.54 inch (.100 inch)    

6.60 mm (0.260 inch)    

6.60 mm (.260 inch)    
Color of the Outer Spring of the Load Piston     Light green color     Yellow color     Light green color         Light green color     Light green color     Light green color    
Color of the Inner Spring of the Load Piston     Light blue color     Light blue color     Light blue color         Orange color     Yellow color     Light green color    
Size of the Decay Orifice    
1.40 mm (0.055 inch)    

1.57 mm (0.062 inch)    

1.98 mm (0.078 inch)    
   
1.57 mm (0.062 inch)    

1.40 mm (0.055 inch)    
   
Color of the Decay Orifice     Yellow color     Green color     Red color         Green color     Yellow color        
( 1 ) The location of the load piston body is identical to the location of the station for the valve. Station "H" is not used.

Selector and Pressure Control Valve

Dual Stage Relief Valve For The Pump

Maximum pressure at 1300 rpm in torque converter drive ... 3065 kPa (445 psi)

System pressure in direct drive with an energized lockup clutch solenoid ... 2100 ± 105 kPa (305 ± 15 psi)

Minimum pressure at low idle in torque converter drive ... 2515 kPa (365 psi)

Table 10
Chart of Spacers for the Relief Valve    
Pt. No. for the Spacers     Thickness of the Spacers     Change in Pressure as a result of one Spacer    
145-0105 Spacer    
.25 mm (0.010 inch)    

41 kPa (6.0 psi)    
145-0106 Spacer    
.90 mm (0.035 inch)    

145 kPa (21.0 psi)    
145-0107 Spacer    
1.60 mm (0.063 inch)    

261 kPa (37.9 psi)    

Priority Reduction Valve

Setting of the pilot pressure for the priority reduction valve ... 1725 ± 70 kPa (250 ± 10 psi)

Table 11
Chart of Spacers for the Priority Reduction Valve    
Pt. No. for the Spacers     Thickness of the Spacers     Change in Pressure as a result of the Spacers    
5M-3492 Spacer    
.25 mm (0.010 inch)    

17 kPa (2.5 psi)    
7M-1397 Spacer    
.91 mm (0.036 inch)    

60 kPa (8.7 psi)    

Transmission Lubrication Pressure

Transmission lubrication pressure at 1300 rpm ... 160 ± 50 kPa (23 ± 7 psi)

Minimum transmission lubrication pressure at low idle ... 5 to 65 kPa (.7 to 9.4 psi)

Relief valve setting ... 240 ± 35 kPa (35 ± 5 psi)

Transmission Lubrication Oil Filter

Pressure setting for the bypass valve ... 248 ± 21 kPa (36 ± 3 psi)

Transmission Charging Oil Filter

Pressure setting for the bypass valve ... 248 ± 21 kPa (36 ± 3 psi)

Rear Axle Oil Filter

Pressure setting for the bypass valve ... 248 ± 21 kPa (36 ± 3 psi)

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