EXHAUST PIPE 0845936 - Caterpillar

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitablecontainers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, Caterpillar Tools and Shop Products Guide for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Table 1
Required Tools    
Tool    Part Number    Description    Qty    
A     9U-6740     Accumulator Charging Group     1    
B     1U-7565     Wrench (6mm Hex)     1    
C     151-8856     Seal (Charging)     1    
Table 2
Accumulator Precharge Pressure–Temperature Relationship for a Typical
1378 kPa ((200 psi)) Hydraulic Accumulator (Rotor Transmission Shift Valve)    
Temperature    Pressure    
-12 °C (10 °F)    
1192 kPa (173 psi)    
-7 °C (20 °F)    
1220 kPa (177 psi)    
-1 °C (30 °F)    
1254 kPa (182 psi)    
4 °C (40 °F)    
1282 kPa (186 psi)    
10 °C (50 °F)    
1316 kPa (191 psi)    
16 °C (60 °F)    
1344 kPa ( 195 psi)    
21 °C (70 °F)    
1378 kPa (200 psi)    
27 °C (80 °F)    
1413 kPa (205 psi)    
32 °C (90 °F)    
1441 kPa (209 psi)    
38 °C (100 °F)    
1475 kPa (214 psi)    
43 °C (110 °F)    
1503 kPa (218 psi)    Nitrogen gas pressure varies with the temperature. Table 2 illustrates the pressure–temperature relationship. To obtain the most accurate nitrogen charge, the temperature of each accumulator must be identical to the air temperature around the accumulators. If the temperature of the accumulators is greater than the air temperature around the accumulators, the temperature of the accumulator should be used instead of the ambient air temperature.
Park the machine on a smooth, horizontal surface in an open area.
Illustration 1 g01181532
Move propulsion lever (1) to the NEUTRAL position.
Illustration 2 g01181533
Move parking brake switch (2) to the ON position.
Stop the engine.
Illustration 3 g01181535
Remove cap (3) from the top of the accumulator.
Rotate plug (4) 60 degrees counterclockwise.Note: Rotating plug (4) more than 60 degrees counterclockwise will cause the loss of the nitrogen charge.
Illustration 4 g01181551
Tool (A)
Ensure that accumulator purge valve (9) is closed.
Screw adapter (11) onto the accumulator.
Loosen plug (4) on accumulator with knob (8), which is on valve body (7). When the needle of pressure gauge (6) begins to move, turn the knob one complete turn. The gauge now registers the accumulator precharge pressure.
Check the temperature of the air around the accumulator, and check the temperature of the accumulator. The reading on pressure gauge (6) must be within the tolerances listed in Table 2.
If the reading on pressure gauge (6) is too high, slowly open accumulator purge valve (9) in order to lower the pressure. If the reading on the pressure gauge is too low, use the following procedure to charge the brake accumulator:
Close accumulator purge valve