PISTON 7U8421 - Caterpillar

Table 1
Required Tools    
Tool    Part Number    Part Description    Qty    
A     4C-4892     ORFS Fittings Group     1    
B     8T-0861     Pressure Gauge
(1)
60000 kPa (8700 psi)     1    
C     160-2513     Flow Meter
41350 kPa (6000 psi)
19 L/min to 190 L/min (5 US gpm to 50 US gpm)     1    
( 1 ) Part of 4C-4892 ORFS Fittings Group Jaw Circuit
Lower the work tool to the ground and stop the engine of the host machine. Relieve the pressure from the hydraulic system. Refer to the Service Manual for the host machine for the proper procedure.
Illustration 1 g00729214
Install Tooling (A) and Tooling (B) on test fitting (1) .
Start the engine of the host machine and operate the machine until the hydraulic oil reaches normal operating temperature.
Open the jaws of the work tool. Close the jaws and continue to hold the control in the CLOSE position in order to allow the cylinder to stall. Observe the pressure on the gauge. The pressure should be 32500 2500 kPa (4715 360 psi). If the pressure is not within the specification, the pressure must be adjusted accordingly. Refer to the Service Manual for the host machine for the proper procedure.
After adjustments have been made, stop the engine on the host machine and relieve the hydraulic pressure. Remove the tooling from the work tool.
Illustration 2 g00729238
Disconnect two hose assemblies (2) from the work tool. The two hoses complete the circuit from the host machine to the jaw circuit of the work tool. Plug the couplings on the work tool in order to prevent contamination.
Install Tooling (A) and Tooling (C) between the two hoses.
Start the engine of the host machine and operate the machine until the hydraulic oil reaches normal operating temperature.
Illustration 3 g00728139
(O) Open (B) Close (R) Rotate the rotator to the right. (L) Rotate the rotator to the left.Note: The flow meter will only measure the flow in one direction. Ensure that the control is selected for the corresponding direction of the flow meter.
Operate the control on the host machine for the jaw circuit. Observe the flow on the meter. The flow should be 85 15 L/min (22.5 4 US gpm). If the flow is not within the specification, the flow must be adjusted accordingly. Refer to the Service Manual for the host machine for the proper procedure.
After adjustments have been made, stop the engine on the host machine and relieve the hydraulic pressure. Remove the tooling and install the two hose assemblies.
The air must be purged from the work tool before operation. Refer to Service Manual, "Hydraulic System Air - Purge" for the proper procedure.Rotate Circuit
Lower the work tool to the ground and stop the engine of the host machine. Relieve the pressure from the hydraulic system. Refer to the Service Manual for the host machine for the proper procedure.
Illustration 4 g00728083
Disconnect two hose assemblies (3) from the work tool. The two hoses complete the circuit from the host machine