CONTROL GP-RETARDER 1461597 - Caterpillar

Table 2
Required Tools (Standard Tooling)    
Tool    Item    Part Number    Description    Qty    
B     B1     177-7860     Hose As     1    
6V-4143 Coupler 2    
B2 8T-0855     Pressure Gauge
0 - 4000 kPa (0 - 580 psi)     1    
6V-3989 Fitting 1    
C     -     4C-6500     Digital Thermometer     1    
To avoid damage to the vibratory system during testing, always perform the testing with the vibratory drum on top of tires or on loose dirt. Tires will simulate a non-compacted soil condition.Never operate the vibratory system when the machine is on concrete.
If a testing time longer than three (3) minutes is required, rotate the drum periodically in order to lubricate the eccentric weight shaft bearings.
Test Procedure with Vibratory System Off
The 198-4240 Digital Pressure Indicator was used in the following test.Note: This testing procedure measures the charge pressure after the charge filter, when the propel control lever is in the STOP position and when the vibratory system is OFF.
Stop the machine and apply the parking brake.
Illustration 4 g00926171
Test port for the vibratory charge filter
Illustration 5 g00926214
Vibratory charge filter
Install Tool (A2) to charge pressure test port (1) which is located after vibratory charge filter (2) .
Start the machine and run the engine at 2310 50 RPM. Check the hydraulic temperature with Tool (C) until the hydraulic oil temperature reaches 38°C (100°F).
Read the charge pressure at pressure test port (1). Charge pressure (NEUTRAL) should be 2950 150 kPa (428 22 psi).Adjusting Procedure
Note: This adjustment works in conjunction with the test when the Vibratory system is OFF.
Illustration 6 g00926246
Vibratory pump (3) Charge pressure relief valve
To increase the charge pressure in NEUTRAL, add shims to relief valve (3). Remove shims from the relief valve in order to decrease the charge pressure.Note: Determine the condition of the charge filter before any adjustments are made. This affects the charge pressure. Nominal stack height of the shims for the charge relief valve is 3.04 mm (.120 inch).
Once Step 1 is complete, tighten the locknut to a torque of 50 5 N m (37 4 lb ft).
Recheck the charge pressure. Once the vibratory charge pressure is correct, proceed to "Testing Procedure for Vibratory System ON".Testing Procedure for Vibratory System ON
Note: This testing procedure measures the charge pressure after the charge filter, when the propel control lever is in the STOP position and when the vibratory system is ON.
Illustration 7 g00926212
Control console (4) Amplitude selector
Place amplitude selector (4) in the LOW AMPLITUDE position.
With the engine at high idle (2310 50 RPM), activate the vibratory system. Observe the vibratory charge pressure at pressure test port (1). The vibratory charge pressure should be 130 70 kPa (19 10 psi) lower than the normal operating pressure that was measured in "Test Procedure with the Vibratory System OFF".
Place amplitude selector (4) in the HIGH AMPLITUDE position. Repeat Step 2 again. The charge pressure should have the same value. This step verifies the movement