REX Mechanical(925) 517-3118

Hydraulic system diagnostics and repair

Pressure and flow testing, cylinder rebuilds, and leak identification.

A technician works on hoses and fittings, an impact socket rail laid out on the machine

A machine that is slow, weak, or drifting is a hydraulic problem, but that describes a dozen different faults with very different costs. A tired pump and a failed relief valve look identical from the seat.

Pressure and flow testing tells you which one it actually is before parts get bought. On a hydraulic system, replacing components in order of likelihood is an expensive way to diagnose.

What the work includes

  • Pressure and flow testing to isolate the fault
  • Cylinder rebuilds — seals, rods and honing
  • Pump, motor and valve diagnosis
  • Leak tracing to the actual source
  • Hose, fitting and line repair

Common questions

The machine is slow — is that the pump?
It might be, and it might be a relief valve, a worn cylinder, a restriction or the oil itself. Those cost very different amounts. Flow testing distinguishes them, which is why it comes before a quote.
Can a cylinder be rebuilt or does it need replacing?
Most can be rebuilt if the rod and bore are serviceable. If the rod is scored or the tube is damaged, rebuilding it just delays the same conversation — you will be told which case you are in.
Why does my machine leak again after a seal change?
Usually because the seal was a symptom. A scored rod, a bent gland or contaminated oil destroys new seals quickly. Finding the cause is the difference between a repair and a recurring bill.

Tell us about the unit

What it is, what it’s doing, and whether it’s drivable.