- Off-Highway Truck/Tractor
- 770G (S/N: KD21-UP; KDH1-UP)
- 772G (S/N: KE31-UP; KEX1-UP)
Introduction
Inspections are the most basic form of condition monitoring. They are easy to do and surprisingly effective at helping you spot equipment health issues. Proactive monitoring and analysis of equipment information will allow Dealers to effectively intervene before problems occur.
Note: Before adjusting product settings to comply with listed baseline TA2 values, consult SIS for the latest specification values.
Creating an Electronic Copy
Use the following procedure to create an editable electronic copy from SIS Web.
- Click format to print.
- Save the document as an HTML format.
- Open the document with Microsoft Word.
Electrical System
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Table 1
Status(1) |
Description |
Specification |
Actual |
Comments |
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Inspect Battery Cables |
Cables between the battery, the starter, and the engine ground must be the correct size. Wires and cables must be free of corrosion. Wires and cables must have cable support clamps to prevent stress on battery connections (terminals). |
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Battery Test |
12.4 VDC or more |
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Refer to Special Instruction, SEHS7633, "Battery Test Procedure". |
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Charging System Test |
18 VDC to 32 VDC |
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Refer to Special Instruction, REHS0354, "Charging System Troubleshooting". |
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Electric Starting System Test |
12 to 16 V at −23° C (−10° F) to −7° C (19° F) |
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Refer to Testing and Adjusting, SENR9832, "37-MT, 41-MT, and 42-MT Series Starting Motors". |
14 to 18 V at −7° C (19° F) to 10° C (50° F) |
16 to 24 V at 10° C (50° F) to 27° C (80° F) |
Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Engine
Cooling System
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Table 2
Status(1) |
Description |
Specification |
Actual |
Comments |
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Radiator Pressure Relief (Radiator Cap)(2) |
- |
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Freezing Point of Engine Coolant |
- |
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Conditioner Test of Engine Coolant |
- |
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Belt Tension |
- |
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Refer to Operation and Maintenance Manual. |
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Difference between the Upper and Lower Radiator Tank Temperatures |
- |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
(2) |
Test for the pressure that is listed on the cap. |
Fuel System
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Table 3
Status(1) |
Description |
Specification |
Actual |
Comments |
|
Fuel Pressure |
689 ± 248 kPa (110 ± 36 psi) |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Lubrication System
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Table 4
Status(1) |
Description |
Specification |
Actual |
Comments |
|
Engine Oil Pressure at Low Idle |
- |
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Engine Oil Pressure at Full Load Speed (2000 rpm) |
- |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Basic Engine
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Table 5
Status(1) |
Description |
Specification |
Actual |
Comments |
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Engine Speed at Low Idle |
700 ± 10 rpm |
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Engine Speed at High Idle |
2000 ± 10 rpm |
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Torque Converter Stall Test Engine RPM |
1200 ± 10 rpm |
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Cylinder Cutout Test |
- |
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Caterpillar Electronic Technician |
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Engine Crankcase Pressure (Blowby) |
- |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Air Inlet and Exhaust System
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Table 6
Status(1) |
Description |
Specification |
Actual |
Comments |
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Torque Converter Stall Test Boost Pressure |
49.8 IN_HG |
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Cylinder # 1 Exhaust Temperature(2) |
- |
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Cylinder # 2 Exhaust Temperature(2) |
- |
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Cylinder # 3 Exhaust Temperature(2) |
- |
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Cylinder # 4 Exhaust Temperature(2) |
- |
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Cylinder # 5 Exhaust Temperature(2) |
- |
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Cylinder # 6 Exhaust Temperature(2) |
- |
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Cylinder # 7 Exhaust Temperature(2) |
- |
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Cylinder # 8 Exhaust Temperature(2) |
- |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
(2) |
Compare the exhaust temperature variance at each exhaust port. |
Performance Checks
Reference: Refer to Testing & Adjusting, UENR1122 for more detail on the following checks.
Operational Checks
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Table 7
Status(1) |
Description |
Specification |
Actual |
Comments |
|
Raise the Dump Body |
18 seconds |
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Front Suspension Group measurement |
170 mm (6.7 inch) |
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Rear Suspension Group measurement from Pin to Pin |
780 ± 13 mm (30.7 ± 0.5 inch) |
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Toe Out Measurement |
50.80 mm (2.00 inch) |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Hydraulic System
Reference: Refer to Testing & Adjusting, UENR1122, "Hydraulic and Braking System" for more detail on the following test.
Service Brakes and Retarder System Pressure - Test
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Table 8
Status(1) |
Description |
Specification |
Actual |
Comments |
|
Pressure at Slack Adjuster for Service Brakes (Retarder in OFF Position at Low Idle) |
6065 ± 345 kPa (880 ± 50 psi) |
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Pressure at Front Pressure Tap for Service Brakes (Retarder in OFF Position at Low Idle) |
7000 ± 690 kPa (1015 ± 100 psi) |
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Slack Adjuster for Service Brakes (Retarder in ON Position at Low Idle) |
5000 ± 690 kPa (725 ± 100 psi) |
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Pressure at Front Pressure Tap for Service Brakes (Retarder in ON Position at Low Idle) |
0 kPa (0 psi) |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Secondary Brake System Pressure Test
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Table 9
Status(1) |
Description |
Specification |
Actual |
Comments |
|
Secondary Brake pressure Test (Brakes are not applied, at Low Idle, in the Neutral position) |
5033 ± 690 kPa (730 ± 100 psi) |
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Secondary Brake pressure Test (Secondary Brakes fully applied at Low Idle, in the Neutral position) |
less than 140 kPa (20 psi) |
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Secondary Brake pressure Test (Brakes are not applied, engine off, in the Neutral position) |
3800 kPa (550 psi) or above |
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Secondary Brake pressure Test (Secondary Brakes fully applied at Low Idle, in the Neutral position) |
less than 140 kPa (20 psi) |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Relief Valve (Hoist Raise, Hoist Lower) - Test and Adjust
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Table 10
Status(1) |
Description |
Specification |
Actual |
Comments |
|
Relief Valve Test ((High Pressure) Engine at high idle, Dump bed fully RAISED) |
18950 +1000 - 500 kPa (2750 +145 -73 psi) |
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Relief Valve Test (Low Pressure) Engine at high idle, Hoist control lever in the LOWER position) |
3450 ± 350 kPa (500 ± 50 psi) |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Relief Valve (Brake Oil Cooler) - Test and Adjust
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Table 11
Status(1) |
Description |
Specification |
Actual |
Comments |
|
Brake cooler relief valve at low idle, hoist control lever in the Float position, while body is in the SNUB position |
1725 kPa (250 psi) |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Power Train System
Reference: Refer to Testing & Adjusting, UENR1122, "Power Train System" for more detail on the following test.
Torque Converter Lockup Clutch Supply Pressure - Test and Adjust
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Table 12
Status(1) |
Description |
Specification |
Actual |
Comments |
|
Modulating valve for the torque converter lockup clutch test (engine running at 1700 rpm, in the NEUTRAL position with the parking brake engaged) |
2068 ± 69 kPa (300 ± 10 psi) |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Gear Pump (Power Train Charging) Pressure - Test and Adjust
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Table 13
Status(1) |
Description |
Specification |
Actual |
Comments |
|
Main Relief Valve Pressure at high idle in the NEUTRAL Position and Parking Brakes are Engaged. The lockup clutch is deactivated. |
3240 ± 69 kPa (470 ± 10 psi) maximum |
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Main Relief Valve Pressure at low idle in the NEUTRAL Position and Parking Brakes are Engaged. The lockup clutch is deactivated. |
2515 kPa (365 psi) minimum |
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(1) |
N = Normal, M = Monitor, A = Action |
Transmission Lubrication Oil Pressure - Test
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Table 14
Status(1) |
Description |
Specification |
Actual |
Comments |
|
Transmission lubrication Relief Valve pressure in the NEUTRAL position at 700 rpm |
20.5 ± 14 kPa (3 ± 2 psi) |
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Transmission lubrication Relief Valve pressure in the NEUTRAL position at 2200 rpm |
172 ± 34 kPa (25 ± 5 psi) |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Transmission Pressures - Test and Adjust
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Table 15
Status(1) |
Description |
Specification |
Actual |
Comments |
|
Clutch 1 |
3100 ± 35 kPa (450 ± 5 psi) |
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Clutch 2 |
1725 ± 35 kPa (250 ± 5 psi) |
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Clutch 3 |
2410 ± 35 kPa (350 ± 5 psi) |
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Clutch 4 |
1930 ± 35 kPa (280 ± 5 psi) |
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Clutch 5 |
3100 ± 35 kPa (450 ± 5 psi) |
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Clutch 6 |
3100 ± 35 kPa (450 ± 5 psi) |
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Clutch 7 |
3100 ± 35 kPa (450 ± 5 psi) |
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Transmission System Pressure at 700 rpm |
2725 ± 70 kPa (395 ± 10 psi) |
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Transmission System Pressure at 1817 rpm |
3100 ± 35 kPa (450 ± 5 psi) |
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|
2200 |
Transmission System Pressure at 2200 rpm |
3240 ± 70 kPa (470 ± 10 psi) |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Steering System
Reference: Refer to Testing & Adjusting, UENR1122, "Steering System" for more detail on the following test.
Control Manifold (Steering) - Test and Adjust
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Table 16
Status(1) |
Description |
Specification |
Actual |
Comments |
|
Main Relief Valve Secondary Steering pressure at high idlePark position |
26000 ± 400 kPa (3770 ± 58 psi) |
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Backup Relief Valve for Secondary Steering pressure at high idle in the Park position |
20700 ± 400 kPa (3002 ± 58 psi) |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Piston Pump (Steering, Fan) - Test and Adjust
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Table 17
Status(1) |
Description |
Specification |
Actual |
Comments |
|
High Pressure Cutoff Valve pressure at high idle |
20850 kPa (3024 psi)Minimum |
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High Pressure Cutoff Valve pressure at high idle |
21550 kPa (3126 psi)Maximum |
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Flow Compensator Valve pressure at high idle |
2000 kPa (290 psi)Minimum |
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Flow Compensator Valve pressure at high idle |
3600 kPa (522 psi)Maximum |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Hydraulic Fan Drive System
Reference: Refer to Testing & Adjusting, UENR1122, "Hydraulic Fan Drive System" for more detail on the following test.
Piston Pump (Steering, Fan) - Test and Adjust
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Table 18
Status(1) |
Description |
Specification |
Actual |
Comments |
|
High Pressure Cutoff Valve pressure at high idle |
20850 kPa (3024 psi)Minimum |
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High Pressure Cutoff Valve pressure at high idle |
21550 kPa (3126 psi)Maximum |
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Flow Compensator Valve pressure at high idle |
2000 kPa (290 psi)Minimum |
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Flow Compensator Valve pressure at high idle |
3600 kPa (522 psi)Maximum |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Generator System
Reference: Refer to Testing & Adjusting, KENR####, "Generator System" for more detail on the following test.
Generator Set - Test
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Table 19
Status(1) |
Description |
Specification |
Actual |
Comments |
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AC Voltage Across Terminals 1 and 2
Half the Rated Speed |
Enter Value |
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AC Voltage Across Terminals 1 and 3
Half the Rated Speed |
Enter Value |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Winding - Test
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Table 20
Status(1) |
Description |
Specification |
Actual |
Comments |
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Exciter Armature (Rotor) |
Enter Value |
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Main Armature (Stator) |
Enter Value |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Insulation - Test
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Table 21
Status(1) |
Description |
Specification |
Actual |
Comments |
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Main Armature |
Enter Value |
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Exciter Field |
Enter Value |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
S.O.S
Reference: Refer to Operation and Maintenance Manual, SEBU8718, "Maintenance Interval Schedule" for more detail on the following test.
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Table 22
Status(1) |
Description |
Obtain |
Comments |
|
Engine Coolant Sample (Level I) |
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Differential and Final Drive Oil Sample |
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Engine Oil Sample |
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Front Wheel Oil Sample |
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Hoist and Brake Tank Oil Sample |
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Steering System Oil Sample |
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Torque Converter and Transmission Oil Sample |
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Engine Coolant Sample (Level II) |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |