FRAME AS-CARBODY 2311874 - Caterpillar

The power train/hydrostatic transmission and the hydraulic system on this machine use the hydraulic tank as a common sump.When the oil in the power train/hydrostatic transmission and hydraulic system gets hot, it causes the air to expand and build up pressure in the hydraulic tank.Pressure can remain in the hydraulic tank after the engine and pumps are stopped.Personal injury can occur if pressure is not released before any service is performed on the power train/hydrostatic transmission or the hydraulic system.To prevent possible injury, remove the cap from the oil filler tube before any fitting, hose, or component in the power train/hydrostatic transmission or hydraulic system is loosened, tightened, removed, and/or adjusted.The cap must be replaced when the tests and/or the adjustments are completed.The bucket and the other attachments must always be flat on the ground before service is performed.When it is necessary for an attachment to be raised while tests and/or adjustments are being performed, be sure the correct supports are in place. In the case of the bucket, it must be in the full DUMP position.Move the machine to a location away from the travel of other machines.Wear the seat belt, and be sure that other personnel are not near the machine when the engine is running and tests or adjustments are being performed.
Tooling
Illustration 1 g00994631
Table 1
Required Tools    
Tool    Item    Part Number    Description    Qty    
A     A1     6V-4143     Coupler     2    
A2 6V-3989     Fitting     1    
A3 8T-0855     Pressure Gauge (4000 kPa (580 psi))     1    
A4 177-7860     Hose As     1    Procedure
Illustration 2 g01011011
(A) Tooling (1) Accumulator (2) Check valve (3) Pressure tap for pilot pressure
Connect tooling (A) to pressure tap (3) for the pilot pressure.
Use calibration submode 20 to engage the brakes.
Do not stall the implements during hydraulic system warm-up. Stalling the implements causes oil to flow across the relief valve. This can damage the vane-type hydraulic pump when the system is cold. Before you allow the implements to stall, wait until the hydraulic system reaches operating temperature.
Start the engine and run the engine at HIGH IDLE in order to warm the oil to operating temperature. Stall the transmission in five second intervals in order to warm the oil to a temperature of 50 °C (122 °F) to 60 °C (140 °F). Wait for ten seconds between each stall of the transmission.
When the oil reaches the operating temperature, run the engine at LOW IDLE and wait for a minute in order for the pilot pressure to stabilize.
Move the attachment to the full RAISE position.
Turn off the engine.
The precharge pressure should read 2860 kPa (415 psi).
When the precharge pressure reaches 2860 kPa (415 psi) at this point, move the attachment to the full LOWER position. If the attachment lowers to the ground, move the pilot lever to all positions in order to release the pressure in the hydraulic system.
Disconnect tooling (A) .