HARNESS AS-POWER 4563756 - Caterpillar

Problems with the transmission may be caused by mechanical faults, electrical faults or hydraulic faults. The mechanical components and the electrical components must be in good condition and the components must operate properly. In addition, the correct operation of the transmission hydraulic system is critical. The transmission oil circulates through the system for operation, for lubrication, and for cooling.To ensure the correct operation of the torque converter and the clutches in the transmission, the oil must be supplied in the correct quantity. Also, the oil must be regulated at the required temperature and the required pressures.The operating temperatures and the operating pressures can be checked in order to help you identify problems when you are troubleshooting the system.The regulated pressure in the system and the operating pressure of the clutches can be checked with a pressure gauge at test point (2) .Test points (4) and (5) are provided if a problem is evident with a particular direction clutch.Test the transmission pressures according to the following procedures:Pressure Tests
Make reference to the S on the first several pages of the Testing And Adjusting section.
Table 1
Required Tools    
Qty     Part Number     Description    
1     9U-7400     Multitach Tool Group    
1     8T-0855     Pressure Gauge (0 to 4,000 kPa (0 to 580 psi))    
1     8T-3613     Nipple Assembly    
1     6V-3966     Fitting    
1     6V-4143     Coupler    
1     177-7861     Hose As    
1     6V-4142     Fitting    
1     6V-4144     Coupler    Install the 9U-7400 Multitach Tool Group on the engine in order to enable an accurate measurement of the engine speed (rpm). Refer to Special Instruction, NEHS0605 for further information on the use of this equipment.Oil level check
Pressure tests must be made with the oil in the transmission at the correct level and at the normal operating temperature. Use the following procedure to check the oil level:
Operate the machine until the oil in the transmission is at 87.5° 5.5°C (190° 10°F).
Operate the engine at low idle.
Remove the filler cap and the dipstick from the transmission and check the level mark.
If necessary, add oil. Install the filler cap and the dipstick.Pressure from Transmission to Oil Cooler
The oil cooler inlet pressure can be tested at inner test point (6) or outer test point (7). Remove the plug from the test point. Install the 8T-0855 Pressure Gauge (0 to 4,000 kPa (0 to 580 psi)) with the following fittings:
8T-3613 Nipple Assembly (inner test point)
6V-3966 Fitting (outer test point)
6V-4143 Coupler
177-7861 Hose As
6V-4142 Fitting
6V-4144 Coupler
Start the engine and operate the engine at 2000 rpm.
The pressure should be a minimum of 172 kPa (25 psi) and a maximum of 965 kPa (140 psi) when the engine is operating at 2000 rpm.
Remove the fittings and install the plug that was removed from the test point.Regulated Pressure and Clutch Operating Pressures
Park the machine in position against a solid, stationary object such