- Wheel Loader
- 986K (S/N: MH81-UP; NL81-UP; SWH1-UP)
Introduction
Inspections are the most basic form of condition monitoring. Inspections 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 intervene effectively 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 |
28 ± 1 V |
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Refer to Special Instruction, REHS0354, "Charging System Troubleshooting". |
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Electric Starting System Test |
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Refer to Testing and Adjusting, UENR3351, "Electric Starting System - Test". |
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(1) |
N = Normal, M = Monitor, A = Action |
Engine
Reference: Refer to Testing & Adjusting, UENR3351 and SENR9832, "C15 and C18 Tier 4 Final Engines" for more detail on the following test.
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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(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 |
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Fuel Pressure at High Idle |
641 kPa (93 psi) |
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(1) |
N = Normal, M = Monitor, A = Action |
Lubrication System
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Table 4
Status(1) |
Description |
Specification |
Actual |
Comments |
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Engine Oil Pressure at Low Idle |
107 kPa (16 psi) |
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Engine Oil Pressure at Full Load Speed |
278 kPa (40 psi) |
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(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 |
800 ± 10 rpm |
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Engine Speed at High Idle |
2165 ± 10 rpm |
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Torque Converter Stall Test Engine RPM |
1850 ± 10 rpm |
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Cylinder Cutout Test |
- |
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Caterpillar Electronic Technician |
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(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 |
201 ± 20 kPa (29 ± 3 psi) |
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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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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
(2) |
Compare the exhaust temperature variance at each exhaust port. |
Hydraulic Performance Checks
Reference: Refer to Testing & Adjusting, M0080189, "986K Large Wheel Loader" for more detail on the following test.
Implement Cycle Time-Check
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Table 7
Status(1) |
Description |
Specification |
Actual |
Comments |
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Lift Raise |
Lift (8.5 seconds - 9.5 seconds) |
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Lift Lower |
Power Down (max 5.7 seconds) |
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Float |
Float (max 4.6 seconds) |
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Tilt Back |
Rack (4 - 4.8 seconds) |
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Dump |
Dump (max 4.2 seconds) |
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(1) |
N = Normal, M = Monitor, A = Action |
Lift and Tilt Cylinder Drift - Check
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Table 8
Status(1) |
Description |
Specification |
Actual |
Comments |
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Maximum Allowable Cylinder Drift for Lift Cylinder at Oil Temperature of 54° to 70°C (129° to 158°F) over 5 minutes |
14 mm (0.6 inch) |
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Maximum Allowable Cylinder Drift for Tilt Cylinder at Oil Temperature of 49° to 65°C (120° to 150°F) over 5 minutes |
20 mm (0.8 inch) |
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(1) |
N = Normal, M = Monitor, A = Action |
Brake Performance Checks
Reference: Refer to Testing & Adjusting, M0080189, "986K Large Wheel Loader" for more detail on the following test.
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Table 9
Status(1) |
Description |
Specification |
Actual |
Comments |
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Brake Accumulator - Test (Test from OMM) |
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Service Brake Holding Ability Test- Test (Test from OMM) |
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Parking Brake Holding Ability Test- Test (Test from OMM) |
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(1) |
N = Normal, M = Monitor, A = Action |
Steering Performance Checks
Reference: Refer to Testing & Adjusting, M0080189, "986K Large Wheel Loader" for more detail on the following test.
Steering Time - Check
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Table 10
Status(1) |
Description |
Specification |
Actual |
Comments |
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Steering time for a full turn from one stop to the other stop (High Idle) |
3.3 ± 0.5 seconds |
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(1) |
N = Normal, M = Monitor, A = Action |
Hydraulic System
Reference: Refer to Testing & Adjusting, M0080189, "986K Large Wheel Loader" for more detail on the following test.
Piston Pump (Implement) Margin Pressure - Test and Adjust
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Table 11
Status(1) |
Description |
Specification |
Actual |
Comments |
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Implement Piston Pump Margin Pressure at HIGH IDLE |
2800 ± 100 kPa (406 ± 15 psi) |
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(1) |
N = Normal, M = Monitor, A = Action |
Relief Valve (Load Sensing Signal) - Test and Adjust
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Table 12
Status(1) |
Description |
Specification |
Actual |
Comments |
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Load Sensing Signal Relief Valve Pressure |
25800 ± 700 kPa (3742 ± 102 psi) |
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(1) |
N = Normal, M = Monitor, A = Action |
Pressure Reducing Valve (Implement Pilot Oil) - Test and Adjust
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Table 13
Status(1) |
Description |
Specification |
Actual |
Comments |
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Pilot Oil Pressure at Low Idle |
3450 ± 200 kPa (500 ± 30 psi) |
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(1) |
N = Normal, M = Monitor, A = Action |
Note: Must be in Float
Pilot Oil Accumulator (Dead Engine, Lift Arm Lower) - Test and Charge
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Table 14
Status(1) |
Description |
Specification |
Actual |
Comments |
|
Accumulator Pressure (High Idle) |
3515 ± 345 kPa (510 ± 50 psi) |
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Accumulator Pressure (Dead Engine Lower) |
1000 ± 50 kPa (145 ± 7.3 psi) |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
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Table 15
Charging Pressure and Temperature Relationship for a Typical 1000 kPa (145 psi) Accumulator |
Temperature |
Pressure |
−7 °C (20 °F) |
906 kPa (131 psi) |
−1 °C (30 °F) |
925 kPa (134 psi) |
4 °C (40 °F) |
943 kPa (137 psi) |
10 °C (50 °F) |
962 kPa (140 psi) |
16 °C (60 °F) |
981 kPa (142 psi) |
21 °C (70 °F) |
1000 kPa (145 psi) |
27 °C (80 °F) |
1019 kPa (148 psi) |
32 °C (90 °F) |
1038 kPa (151 psi) |
38 °C (100 °F) |
1057 kPa (153 psi) |
43 °C (110 °F) |
1075 kPa (156 psi) |
49 °C (120 °F) |
1094 kPa (159 psi) |
Ride Control Signal Pressure - Check
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Table 16
Status(1) |
Description |
Specification |
Actual |
Comments |
|
Ride Control Signal Pressure (Low Idle) |
3500 ± 150 kPa (508 ± 22 psi) |
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(1) |
N = Normal, M = Monitor, A = Action |
Ride Control Accumulator - Test and Charge
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Table 17
Charging Pressure and Temperature Relationship for a Typical 2300 kPa (334 psi) Accumulator |
Temperature |
Pressure |
−7 °C (20 °F) |
2083 kPa (302 psi) |
−1 °C (30 °F) |
2126 kPa (308 psi) |
4 °C (40 °F) |
2170 kPa (315 psi) |
10 °C (50 °F) |
2213 kPa (321 psi) |
16 °C (60 °F) |
2257 kPa (327 psi) |
21 °C (70 °F) |
2300 kPa (334 psi) |
27 °C (80 °F) |
2343 kPa (340 psi) |
32 °C (90 °F) |
2387 kPa (346 psi) |
38 °C (100 °F) |
2430 kPa (352 psi) |
43 °C (110 °F) |
2474 kPa (359 psi) |
49 °C (120 °F) |
2517 kPa (365 psi) |
Power Train System
Reference: Refer to Testing & Adjusting, M0080189, "986K Large Wheel Loader" for more detail on the following test.
Transmission Pressures - Test
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Table 18
Status(1) |
Description |
Specification |
Actual |
Comments |
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Clutch "1" Pressure (Reverse in Any Speed) |
2100 ± 138 kPa (305 ± 20 psi) |
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Clutch "2" Pressure (Forward in Any Speed) |
2100 ± 138 kPa (305 ± 20 psi) |
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Clutch "3" Pressure (Neutral) |
2100 ± 138 kPa (305 ± 20 psi) |
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Clutch "4" Pressure (Forward or Reverse/Third Speed) |
2100 ± 138 kPa (305 ± 20 psi) |
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Clutch "5" Pressure (Second Speed/Forward or Reverse) |
2100 ± 138 kPa (305 ± 20 psi) |
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Clutch "6" Pressure (First Speed/Forward or Reverse) |
2100 ± 138 kPa (305 ± 20 psi) |
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(1) |
N = Normal, M = Monitor, A = Action |
Torque Converter Inlet Pressure (High Idle)
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Table 19
Status(1) |
Description |
Specification |
Actual |
Comments |
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Torque Converter Inlet Pressure (High Idle) |
925 ± 50 kPa (135 ± 7.5 psi) |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Torque Converter Outlet Pressure (Torque Converter Stall)
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Table 20
Status(1) |
Description |
Specification |
Actual |
Comments |
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Torque Converter Outlet Pressure (Torque Converter Stall) |
448 ± 103 kPa (65 ± 15 psi) |
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(1) |
N = Normal, M = Monitor, A = Action |
Transmission Lubrication Pressure (High Idle)
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Table 21
Status(1) |
Description |
Specification |
Actual |
Comments |
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Transmission Lubrication Pressure (High Idle) |
190 ± 50 kPa (28 ± 7 psi) |
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(1) |
N = Normal, M = Monitor, A = Action |
Transmission Oil Pump Pressure (High Idle)
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Table 22
Status(1) |
Description |
Specification |
Actual |
Comments |
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Transmission Oil Pump Pressure (High Idle) |
2350 ± 400 kPa (341 ± 58 psi) |
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(1) |
N = Normal, M = Monitor, A = Action |
Steering System
Reference: Refer to Testing & Adjusting, M0080189, "986K Large Wheel Loader" for more detail on the following test.
Piston Pump (Steering) High-Pressure Stall - Test and Adjust
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Table 23
Status(1) |
Description |
Specification |
Actual |
Comments |
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High-Pressure Cutoff (High Idle) |
27600 ± 350 kPa (4003.0 ± 51.0 psi) |
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(1) |
N = Normal, M = Monitor, A = Action |
Piston Pump (Steering) Margin Pressure - Test and Adjust
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Table 24
Status(1) |
Description |
Specification |
Actual |
Comments |
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Margin Pressure (High Idle) |
2400 kPa (348 psi) |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Relief Valve (Steering Cylinder Crossover) - Test and Adjust
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Table 25
Status(1) |
Description |
Specification |
Actual |
Comments |
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Relief Valve Steering Cylinder Crossover Pressure |
33100 ± 1300 kPa (4801 ± 189 psi) |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Steering Relief Valve (Main Backup) - Test and Adjust
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Table 26
Status(1) |
Description |
Specification |
Actual |
Comments |
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Relief Valve Steering Backup Pressure |
30000 ± 700 kPa (4352 ± 102 psi) |
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(1) |
N = Normal, M = Monitor, A = Action |
Steering Neutralizer Valve - Check and Adjust
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Table 27
Status(1) |
Description |
Specification |
Actual |
Comments |
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Distance between Front and Rear Frame |
12.7 ± 2.54 mm (0.5 ± 0.1 inch) |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Brake and Hydraulic Fan System
Reference: Refer to Testing & Adjusting, M0080189, "986K Large Wheel Loader" for more detail on the following test.
Piston Pump (Brake) Pressure - Test and Adjust
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Table 28
Status(1) |
Description |
Specification |
Actual |
Comments |
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Brake Oil Pressure at High Idle |
21600 ± 350 kPa (3133 ± 51 psi) |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Service Brake System Pressure - Test
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Table 29
Status(1) |
Description |
Specification |
Actual |
Comments |
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Rear Service Brake Pressure (Brake ON) |
6200 ± 276 kPa (899 ± 40 psi) |
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Front Service Brake Pressure (Brake ON) |
6200 ± 276 kPa (899 ± 40 psi) |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Brake Accumulator - Test and Charge
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Table 30
Accumulator Precharge Pressure/Temperature Relationship for a Typical 6200 kPa (900 psi) Brake Accumulator |
Date |
Equipment ID Code |
Temperature |
Pressure 6200 kPa (900 psi) |
Actual |
−7°C (20°F) |
5616 kPa (815 psi) |
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−1°C (30°F) |
5733 kPa (832 psi) |
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4°C (40°F) |
5850 kPa (849 psi) |
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10°C (50°F) |
5967 kPa (866 psi) |
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16°C (60°F) |
6084 kPa (883 psi) |
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21°C (70°F) |
6201 kPa (900 psi) |
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27°C (80°F) |
6318 kPa (917 psi) |
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32°C (90°F) |
6435 kPa (934 psi) |
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38°C (100°F) |
6552 kPa (951 psi) |
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43°C (110°F) |
6669 kPa (968 psi) |
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49°C (120°F) |
6786 kPa (985 psi) |
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Parking Brake System Pressure - Test
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Table 31
Status(1) |
Description |
Specification |
Actual |
Comments |
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Pump Cut-out Pressure |
21000 ± 350 kPa (3046 ± 51 psi) |
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Cut-in Valve Pressure |
12066 ± 345 kPa (1750 ± 50 psi) |
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Cut-out Valve Pressure |
15513 ± 345 kPa (2250 ± 50 psi) |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Parking Brake - Check
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Table 32
Status(1) |
Description |
Specification |
Actual |
Comments |
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Low Idle |
825 ± 30 RPM |
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High Idle |
2340 ± 60 RPM |
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(1) |
N = Normal, M = Monitor, A = Action |
Hydraulic Fan Speed - Test and Adjust
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Table 33
Status(1) |
Description |
Specification |
Actual |
Comments |
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Maximum Fan Speed |
1285 RPM (STD)(2) |
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1400 RPM(3) |
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Minimum Fan Speed |
500 RPM |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
(2) |
Standard cooling package |
(3) |
High Ambient cooling package |
S·O·S Samples
Reference: Refer to Operation and Maintenance Manual, M0069636, "Maintenance Interval Schedule" for more detail on performing S.O.S samples.
Engine Oil Sample
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Table 34
Status(1) |
Description |
Obtain |
Comments |
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Engine Oil Sample |
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(1) |
N = Normal, M = Monitor, A = Action |
Engine Coolant Sample
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Table 35
Status(1) |
Description |
Obtain |
Comments |
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Engine Coolant Sample |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Hydraulic Oil Sample
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Table 36
Status(1) |
Description |
Obtain |
Comments |
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Hydraulic Oil Sample |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Differential & Final Drive Oil Samples (Inboard Final Drives)
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Table 37
Status(1) |
Description |
Obtain |
Comments |
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Front Differential & Final Drive Oil Sample |
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Rear Differential & Final Drive Oil Sample |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |
Differential & Final Drive Oil Samples (Outboard Final Drives)
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Table 38
Status(1) |
Description |
Obtain |
Comments |
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Front Differential Oil Sample |
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Rear Differential Oil Sample |
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Left Front Final Drive Oil Sample |
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Right Front Final Drive Oil Sample |
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Left Rear Final Drive Oil Sample |
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Right Rear Final Drive Oil Sample |
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(1) |
N = Normal, M = Monitor, A = Action |
Transmission/Torque Converter Oil Sample
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Table 39
Status(1) |
Description |
Obtain |
Comments |
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Transmission/Torque Converter Oil Sample |
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Show/hide table
(1) |
N = Normal, M = Monitor, A = Action |