BAFFLE A 2Z8172 - Caterpillar

Service Inspection of the Track Tension Accumulator
In order to verify that the correct pressure is in the accumulators, follow the procedure to check the hydraulic pressure in the accumulator. Refer to Specifications, Systems Operation, Testing and Adjusting, "Check for the Hydraulic Pressure in the Accumulator". If the pressure is low, you should check the nitrogen pressure of the accumulator. Refer to Specifications, Systems Operation, Testing and Adjusting, "Checking and Charging the Nitrogen Pressure".Service Inspection for the Accumulator for the Auxiliary System
Note: You must purge the hydraulic pressure side in order to test the nitrogen side of the accumulator. You must turn off the machine and you must cycle the hoppers several times in order to purge the hydraulic pressure side.
Table 1
207-4843 Hydraulic Accumulator Assembly    
Temperature vs. Pre-Charge Pressure    
The Ambient Temperature     207-4843 Hydraulic Accumulator As pressure    
49 °C (120 °F)    
9915 kPa (1438 psi)    
43 °C (110 °F)    
9729 kPa (1411 psi)    
38 °C (100 °F)    
9535 kPa (1383 psi)    
32 °C (90 °F)    
9342 kPa (1355 psi)    
27 °C (80 °F)    
9156 kPa (1328 psi)    
21 °C (70 °F)    
8963 kPa (1300 psi)    
16 °C (60 °F)    
8770 kPa (1272 psi)    
10 °C (50 °F)    
8584 kPa (1245 psi)    
4 °C (40 °F)    
8391 kPa (1217 psi)    
Table 2
Required Tools    
Quantity     Part Number     Description    
1     9U-6740     Accumulator Charging Group    
1     1U-7565     Wrench    
1     151-8856     Seal    
Illustration 1 g00839692
207-4843 Hydraulic Accumulator Assembly
Illustration 2 g00876681
(A) 93 mm (3.66 inches) (B) 21 mm (0.83 inch) (C) 93 mm (3.66 inches) (D) 23 mm (0.91 inch) (E) Hex 36 (F) M28 x 1.5 Thread
Table 3
Required Parts    
Item    Part Number    Description    
1     134-3665     Screw    
2     134-3666     Seal    
3     207-6068     Dust Cap    
4     207-9821     Film    
5     5P-3779     Cylinder Tag    
Insert item 5 through the loop. Refer to illustration 2.    Perform the following steps.
Remove dust cap (3) over the screw. Make sure that there is no paint and grease in the area. Make sure that the purging side of the gauge is closed.
Use a 1U-7565 Wrench to rotate screw (1) counterclockwise by 60°.Note: Do not loosen screw (1) more than 60°. This will cause the pressure to be lost.
Put the charging group in screw (1) on the end of the accumulator. Connect the 9U-6740 Accumulator Charging Group and connect the 151-8856 Seal to the 207-4843 Accumulator .
Hold the tee when you thread the charging group on the accumulator. This will ensure that the tee does not turn.Note: Make sure that the charging group is tight.
Loosen screw (1). One or two turns counterclockwise.Note: Do not turn the screw more than two turns.
The gauge should read 8963 172 kPa (1300 25 psi).Note: Service