TAG-IDENTIFICATION 7K3972 - Caterpillar

Illustration 1 g00772300
Top of Tractor Above Steering Cylinder (1) Hose
Disconnect both hoses (1) from one steering cylinder.
Install 6V-7945 Plate Assembly from 8T-5320 Hydraulic Test Group beneath the front hose flange. Install 6V-7946 Plate Assembly from 8T-5320 Hydraulic Test Group beneath the rear hose flange. Use 0S-1571 Bolts. Attach 8T-0854 Pressure Gauges to the plate assemblies.
Do not turn the steering wheel when the engine is running and a low pressure gauge has been installed in the steering circuit. If the steering wheel is turned, the pressure of the oil to the steering cylinders will be too high for a low pressure gauge.
Start the engine and operate the engine at low idle. Check the pressure readings on the two pressure gauges.
The difference between the pressure in the right cylinder and the pressure in the left cylinder cannot exceed 35 kPa (5 psi). If the pressure is out of tolerance, complete the following procedure.
Illustration 2 g00792370
(2) Steering control valve (3) Cover (4) Spacers (5) Shims (8) Nut (9) Retainer
Remove cover (3) from steering control valve (2) .
Add shims (5) if the pressure for a left turn is higher than the pressure for a right turn. Remove shims (5) if the pressure for a left turn is lower than the pressure for a right turn.
Install cover (3) to steering control valve (2) .
Purge the steering system.Steering System Pressure
Table 2
Required Tools    
Part Number     Description     Quantity    
4C-4892     ORFS Fittings Group     1    
8T-0854     Pressure Gauge     1    
Illustration 3 g00772472
(6) Test Port (7) Hydraulic Pump (Steering section)
Move the machine to a level, hard surface. Shut off the engine and engage the parking brake.
Attach the 6V-4143 Coupler to one end of the 177-7860 Hose As. Attach the 8T-0854 Pressure Gauge to the opposite end of the 177-7860 Hose As with the 8T-4188 Union Adapter.
Do not turn the steering wheel when the engine is running and a low pressure gauge has been installed in the steering circuit. If the steering wheel is turned, the pressure of the oil to the steering cylinders will be too high for a low pressure gauge.
Start the engine and operate the engine at high idle. The pressure gauge should now read 790 80 kPa (115 12 psi). If the pressure reading is within tolerance, continue to Step 4. If the pressure reading is out of tolerance, stop the machine and shut off the engine. Complete the following procedure.
Remove cover (3) from steering control valve (2) .
Add spacers (4) in order to increase the pressure. Remove spacers (4) in order to decrease the pressure.
Install cover (3) to steering control valve (2) .
Purge the steering system.
Repeat Step 3.
Remove 8T-0854 Pressure Gauge and install a 8T-0859 Pressure Gauge to the tee.
Start the engine and operate the engine at high idle. Raise the bowl and release the brakes.
Turn the machine toward the left until the left turn stops hit. Continue steering to the left. The pressure gauge should read 13700 400 kPa (1987