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15 Troubleshooting
Deactivated safeguards!
Danger to life! Risk of injury!
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Successful troubleshooting within the hydraulic power unit requires precise
knowledge on the set-up and the function of individual components. The
combination of hydraulics with an electrical system and electronics makes
troubleshooting very complex.
Circuit diagrams (hydraulic and electric), parts lists, functional diagrams as
applicable and other documentation must be available for effective troubleshooting.
15.1 How to proceed for troubleshooting
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• Have modifications (e.g. refittings) or repair works been carried out on the overall
Control questions
system (machine/system, electrical system, control) or on the hydraulic power
unit?
• If yes: What were they?
• Was the hydraulic power unit or the machine/system used as intended?
• How did the fault become apparent?
• Try to clarify the cause of error.
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Make sure that all safeguards, e.g. fuses, protective grounding conductor,
pressure relief valves, covers (frequency converter) are active.
Proceed with extreme caution if safeguards need to be deactivated or covers
removed for troubleshooting.
If possible, operate the machine/system with reduced performance data in set-
up mode for identification of errors.
Always work systematically and purposefully, even when under time pressure.
Random, thoughtless disassembly and changing of settings can, in the worst-
case-scenario, result in the inability to determine the original cause of the error.
First, get a general idea of the function of the hydraulic power unit in combination
with the overall machinery/system.
Try to find out whether the hydraulic power unit has worked properly in
combination with the overall machinery/system before the error occurred first.
Try to determine any changes of the overall machinery/system, in which the
hydraulic power unit is integrated:
Were there any changes to the application conditions or area of application of the
hydraulic power unit?
Ask the direct (machine) operator.
Alphabetical index
WARNING
CytroPac, RE 51055-B/06.17, Bosch Rexroth AG
69/84
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