773D Off-Highway Truck and 775D Quarry Truck Caterpillar

Torque Converter and Transmission Pressure Chart

Usage:

775D 8AS

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Table 1
Shift Points At Nominal Engine Speed
Upshift	Engine Speed	Transmission Output Speed
1C to 1L	1425 ± 40	299
1L to 2	2170 ± 30	455
2 to 3	2150 ± 30	630
3 to 4	2150 ± 30	853
4 to 5	2150 ± 30	1145
5 to 6	2150 ± 30	1549
6 to 7	2150 ± 30	2089
Downshift	Engine Speed	Transmission Output Speed
7 to 6	1500 ± 30	1972
6 to 5	1500 ± 30	1458
5 to 4	1500 ± 30	1081
4 to 3	1500 ± 30	799
3 to 2	1500 ± 30	595
2 to 1L	1415 ± 30	415
1L to 1C	1275 ± 30	267

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Table 2
Maximum Travel Speeds At 2150 RPM (24.00-R35 Tires)
Gear	Speed
R	11.7 km/h (7.3 mph)
1	10.1 km/h (6.3 mph)
2	14.2 km/h (8.8 mph)
3	19.2 km/h (11.9 mph)
4	25.7 km/h (16.0 mph)
5	34.9 km/h (21.7 mph)
6	47.0 km/h (29.2 mph)
7	63.6 km/h (39.5 mph)

Specifications for the Torque Converter

Outlet Relief Valve

Pressure setting for the outlet relief valve ... 414 ± 34 kPa (60 ± 5 psi)

Torque converter outlet pressure at stall speed ... 414 ± 34 kPa (60 ± 5 psi)

Torque converter stall speed at operating temperature ... 1832 rpm

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Table 3
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	0.25 mm (0.01 inch)	5 kPa (0.73 psi)
5M-9623 Spacer	0.90 mm (0.035 inch)	18 kPa (2.61 psi)
5M-9622 Spacer	1.60 mm (0.063 inch)	31 kPa (4.50 psi)

Power Train Oil Filter

Pressure setting for the bypass valve ... 276 ± 28 kPa (40.0 ± 4.0 psi)

Lockup Clutch and Solenoid Valve

Pressure Reduction Valve

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

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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	0.13 mm (0.005 inch)	10 kPa (1.5 psi)
6J-3993 Shim	0.25 mm (0.01 inch)	19 kPa (2.8 psi)
5J-1036 Shim	0.80 mm (0.031 inch)	60 kPa (8.7 psi)

Modulation Reduction Valve

Pressure at low idle ... 1720 ± 70 kPa (249 ± 10 psi)

Lockup clutch primary pressure at low idle ... 960 ± 35 kPa (139 ± 5 psi)

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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	0.12 mm (0.005 inch)	10 kPa (1.4 psi)
2S-0675 Spacer	0.40 mm (0.016 inch)	32 kPa (4.6 psi)
9J-1330 Shim	0.79 mm (0.031 inch)	62 kPa (9.0 psi)

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Before an adjustment is performed, be certain that the valve springs are not weak or broken.

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Table 6
Speed	Engaged Clutches	Torque Converter Drive	Direct Drive (Engaged Lockup Clutch)
Neutral	4	X	-
Reverse	1 and 7	X	-
First Gear	1 and 6	X	X
Second Gear	3 and 6	-	X
Third Gear	2 and 6	-	X
Fourth Gear	3 and 5	-	X
Fifth Gear	2 and 5	-	X
Sixth Gear	3 and 4	-	X
Seventh Gear	2 and 4	-	X

Transmission

Pressure Control Valve

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Table 7
Station ⁽¹⁾	A	B	C	E	F	G	H
Engaged Clutch	2	1	7	5	4	6	3
Type of Test	Pressure
Clutch Pressure At High Idle	2265 ± 115 kPa (329 ± 17 psi)	2940 ± 165 kPa (426 ± 24 psi)	2940 ± 165 kPa (426 ± 24 psi)	2250 ± 125 kPa (326 ± 18 psi)	2240 ± 125 kPa (325 ± 18 psi)	2940 ± 165 kPa (426 ± 24 psi)	2480 ± 140 kPa (360 ± 20 psi)
Primary Clutch Pressure At Low Idle	440 ± 20 kPa (64 ± 3 psi)	315 ± 20 kPa (46 ± 3 psi)	315 ± 20 kPa (46 ± 3 psi)	310 ± 20 kPa (45 ± 3 psi)	300 ± 20 kPa (44 ± 3 psi)	315 ± 20 kPa (46 ± 3 psi)	330 ± 20 kPa (48 ± 3 psi)

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Station "D" is not used.

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Table 8
Shims For The Pressure Control Valve Pressure Change Per Shim
Station ⁽¹⁾	A	B	C	E	F	G	H
Engaged Clutch	2	1	7	5	4	6	3
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)	14 kPa (2.0 psi)	20 kPa (2.9 psi)	20 kPa (2.9 psi)	15 kPa (2.2 psi)	15 kPa (2.2 psi)	20 kPa (2.9 psi)	17 kPa (2.5 psi)
6J-3993 Shim
0.25 mm (0.010 inch)	28 kPa (4.1 psi)	41 kPa (5.9 psi)	41 kPa (5.9 psi)	30 kPa (4.4 psi)	30 kPa (4.4 psi)	41 kPa (5.9 psi)	33 kPa (4.8 psi)
4M-1751 Spacer
0.41 mm (0.016 inch)	45 kPa (6.5 psi)	65 kPa (9.4 psi)	65 kPa (9.4 psi)	48 kPa (7.0 psi)	48 kPa (7.0 psi)	65 kPa (9.4 psi)	53 kPa (7.7 psi)
5J-1036 Shim
0.80 mm (0.031 inch)	87 kPa (12.6 psi)	125 kPa (18.2 psi)	125 kPa (18.2 psi)	92 kPa (13.3 psi)	92 kPa (13.3 psi)	125 kPa (18.2 psi)	103 kPa (14.9 psi)

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Station "D" is not used.

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Table 9
Specifications And Identification Of The Components Of The Pressure Control Valve
Location of the Load Piston Body ⁽¹⁾	A	B	C	E	F	G	H
Thickness of the Load Piston Orifice	4.58 mm (0.180 inch)	4.58 mm (0.180 inch)	6.60 mm (0.260 inch)	2.54 mm (0.100 inch)	4.58 inch (0.180 inch)	6.60 mm (0.260 inch)	4.58 mm (0.180 inch)
Color of the Outer Spring of the Load Piston	Light blue color	Light green color	Light green color	Light blue color	Light blue color	Light green color	Yellow color
Color of the Inner Spring of the Load Piston	Light green color	Light blue color	Light blue color	Light blue color	Light blue color	Light blue color	Light blue color
Size of the Decay Orifice	1.57 mm (0.062 inch)	1.57 mm (0.062 inch)	1.40 mm (0.055 inch)	1.57 mm (0.062 inch)	1.57 mm (0.062 inch)	1.57 mm (0.062 inch)	1.57 mm (0.062 inch)
Color of the Decay Orifice	Green color	Green color	Yellow color	Green color	Green color	Green color	Green color

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The location of the load piston body is identical to the location of the station for the valve. Station "D" is not used.

Selector and Pressure Control Valve

Relief Valve

Relief valve setting ... 2790 ± 35 kPa (405 ± 5 psi)

Maximum pressure at high idle ... 3220 ± 110 kPa (467 ± 16 psi)

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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	0.25 mm (0.010 inch)	41 kPa (6.0 psi)
145-0106 Spacer	0.90 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 ... 1755 ± 35 kPa (255 ± 5 psi)

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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	0.25 mm (0.010 inch)	17 kPa (2.5 psi)
7M-1397 Spacer	0.91 mm (0.036 inch)	60 kPa (8.7 psi)