ROD AS 4Z6010 - Caterpillar

Specifications
Table 1
Accumulator Precharge Pressure
Limit Pressure Actual
Cut out pressure 18000 345 kPa (2600 50 psi)
Cut in pressure 15000 1050 kPa (2150 150 psi) Introduction
This information includes the following test:
Cut out pressure for the piston pump
Cut in pressure for the piston pumpRequired Tools
Illustration 1 g02571852
Tooling (A) 198-4240 Digital Pressure Indicator Gp
Table 2
Required Tools
Tool Item Qty Part No Description
A 198-4240 Digital Pressure Indicator Gp
A1 1 198-4234 Digital Indicator
A2 1 198-4239 Pressure Sensor Gp
(0 to 41,368 kPa (0 to 6,000 psi))
A3 1 198-4236 Adapter Cable As Check Preparation
Start the engine and warm up the hydraulics if necessary. The hydraulic oil temperature should be at least 60° C (140° F)
Park the machine on a level surface. Move the transmission control to the ENGAGED position and shut off the engine.
Move parking brake to the engaged position.
Install the steering frame lock. Refer to Operation and Maintenance Manual, "Steering Frame Lock".Test Procedure
Illustration 2 g03775679
(1) Combination valve
Illustration 3 g03775063
(T1) Brake pump discharge pressure test port TPBR
(T2) Brake accumulator charge pressure test port TB1
Make repeated light applications of the service brakes until all the pressure which is stored in the brake accumulators is fully exhausted.
Remove the dust cap and install the proper required tools from Table 2 to test pressure. Connect gauge to test fitting (T1).
Start the engine. Operate the engine at low idle and observe the pressure gauge. The pressure should increase up to 18000 345 kPa (2600 50 psi). This reading is the cut out pressure for the piston pump.
Shut off the engine. Make repeated light applications of the service brakes and observe the pressure on the pressure