Hitachi Zaxis 50 U Slow Hydraulics

lundi 23 juin 2014

I have just purchased a Zaxis 50U (roughly 2005) at a very reasonable price however it has slow hydraulics. When operating the machine the hydraulics take ages to build up pressure to work and when they do they move at such a slow speed.



The previous owner had spend a lot of money trying to fix the issue. However it was a business and couldn't afford to keep the machine out of operation thus the reason for selling.



The previous owner had performed the following repairs:



- Repaired slipper plate and piston spool.

- Reconditioned Pump

- New Pilot Pump

- Reinstall pump and tested

- Blow out fuel lines

- Cleaned pilot speed control valve

- Reset valves to specifications

- Drained Hydraulic Tank

- Remove main control valve

- Refilled and bled pumps

- Reduce main pump output flow



Could anyone shed some light on what may be the problem and how it could possibly be fixed.



Also if anyone could supply a Technical manual for this machine would greatly appreciated.



Many thanks,

Chris




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