BUCKET CYLINDER 0990701 - Caterpillar

Table 1
Required Tools    
Part Number    Description    Quantity    
8T-0846     Pressure Gauge (
0 1000 kPa (0 145 psi))     1    
177-7862     Hose Assembly     1    
6V-4143     Coupler     2    
Personal injury or death can result from sudden machine movement.Sudden movement of the machine or release of oil pressure can cause injury to persons on or near the machine.To help prevent possible injury or death, refer to the information in Testing and Adjusting, "Machine Preparation for Troubleshooting".
Note: Make sure that the filters and the screens are clean before you test any pressures. Make sure that the oil is at operating temperature before you perform this test.
Illustration 1 g01042268
View of the torque converter outlet relief valve (1) Pressure tap for torque converter outlet relief valveThis test will show the following conditions if the conditions exist:
The torque converter operates correctly.
Torque converter outlet relief valve is correctly set.Procedure
Connect 8T-0846 Pressure Gauge (0 to 1,000 kPa (0 to 145 psi)) to pressure tap (1) .
Start the engine.
Engage the parking brakes and the service brakes.
Move the transmission control to the FIRST position.
Slowly increase the engine rpm.
The engine rpm must be 1950 50 rpm with the torque converter in a stall condition.
The pressure reading should read 415 35 kPa (60 5 psi).
Do not keep the torque converter in a stall condition for long periods of time. Damage could occur in the torque converter, the engine, and the brakes.
When this test is complete, move the transmission control to the NEUTRAL. Stop the engine. Remove the test equipment.Problem: The engine rpm is out of specification.
Probable Cause
Refer to the engine system Troubleshooting, "Cannot Reach Top Engine RPM" for problems that involve the engine.
The torque converter failed.Problem: The engine rpm is correct, but the stall speed is too high and the torque converter outlet pressure is correct.
Probable Cause
The torque converter failed.
The engine has too much power.Problem: The torque converter outlet pressure is too low, and the oil gets too hot during normal operation.
Perform the test in Testing and Adjusting, "Torque Converter Inlet Pressure - Test".Problem: The torque converter outlet pressure is too low.
Probable Cause
Illustration 2 g03685678
(2) Torque converter outlet relief valve (3) Spacers
Table 2
Chart of Spacers for the Outlet Relief Valve (1)    
Pt. No. for Spacer    Thickness    Change in Pressure    
5M-9624 Spacer    
0.25 mm (0.010 inch)    
5 kPa (0.73 psi)    
5M-9623 Spacer    
0.90 mm (0.035 inch)    
18 kPa (2.6 psi)    
5M-9622 Shim    
1.60 mm (0.063 inch)    
32 kPa (4.6 psi)    
( 1 ) Before an adjustment is made, be certain that the valve spring is not weak or broken.
The torque converter outlet relief valve is set too low. Add spacers (3). Refer to Table 2.
The torque converter inlet pressure is not correct. Perform the test in Testing and Adjusting, "Relief Valve (Torque Converter Inlet) Pressure - Test".Problem: The torque converter outlet pressure is too high, and the oil temperature is not