Hyundai HX130LCR Manual page 81

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ARM REGENERATION

The return flow from the arm cylinder rod side is pressurized by self weight of arm and so, returns to

port D4. The pressurized oil returning to port D4 enters the arm regeneration & breaker spool through

the arm holding valve and the arm 1 spool. It is supplied the arm cylinder head through internal

passage. This is called the arm regeneration function.

The amount of regeneration fluid is changed by movement of the arm regeneration spool. A few

fluids after P2 parallel passage is push piston "C" through the notch of arm regeneration spool and

selector spool. At this time, the selector spool is opened by pilot pressure from RCV.

Then, the arm regeneration spool shifts to right side and flow to tank pass increases and regeneration

flow decreases. Therefore, pressure of arm cylinder head increases, then, arm regeneration flow

Furthermore, the arm regeneration cut pressure is supplied to the port Pb4 of spring opposite side

and arm regeneration spool is move into the right direction fully. The flow from the arm cylinder rod is

returned to the hydraulic oil tank and regeneration function is not activated. (The return fluid is

maximum condition)

Load check valve

P2 Parallel passage

Selector spool

Arm regeneration

cut pilot pressure

pilot pressure

Arm regeneration

& breaker spool

Arm summation passage

Arm holding valve

Tank passage

P2 Bypass passage

Troubleshooting