Bosch Rexroth 4WRPD - 13 Extension and modification; 14 Troubleshooting; 14.1 How to proceed for troubleshooting

44/48 Extension and modification
Bosch Rexroth AG, 4WRPD(H), 4WRPQ(H), 4WRPF(H), 4WRLD, 4WRLF, 4WRLQ, 5WRPF10, 5WRPQ10; RE 29391-B/05.2021
13 Extension and modification
The valve on Multi-Ethernet basis must not be extended or modified. Modification
of the valve will lead to expiry of warranty.
14 Troubleshooting
14.1 How to proceed for troubleshooting
 Always work systematically and purposefully, even when under time pressure.
Random and imprudent disassembly and readjustment of settings can, in the
worst-case scenario, result in the inability to determine the original cause of
error.
 First, get an overview of the functions of the valve in conjunction with the
overall system.
 Try to find out whether the valve has functioned properly in conjunction with
the overall system before the error occurred first.
 Try to determine any changes of the overall system in which the valve is
integrated:
– Were there any changes to the application conditions or area of application of
the valve?
– Were there any changes (e.g. retrofit) or repairs carried out on the complete
system (machine/system, electrics, control) or on the valve? If yes, which?
– Was the valve or machine used as intended?
– How did the fault become apparent?
 Try to get a clear idea of the cause of error. If possible, ask the direct (machine)
operator.