2-71
Stopping operation
Returning the control valve to neutral position while running the motor, the oil supply is cut off
and VA and VB ports are connected to the tank line. Then the pressure of the pilot chamber
located on both spool ends become equal, and the spool (31) returns to the neutral position by
spring (33) force. Thus, the passage from MA to VA is closed.
Owing to the inertia force of the load, the hydraulic motor tends to continue the rotation. Here,
the motor functions as a pump and forwards the oil to MB port but the passage is blocked and
MB port pressure increases. Then the relief valve opens to relieve the pressure and rotational
speed decelerates and at last the motor stops.
Negative brake release pressure is gradually lowered due to the restrictor and finally the brake
works and the motor is mechanically stopped.
③
VB
VA
VB
VA
MB
MA
MB
MA
DR
DR
125LCR2TM31
Summary of Contents for HX130 LCR
Page 11: ...1 1 SECTION 1 GENERAL Group 1 Safety Hints 1 1 Group 2 Specifications 1 10 ...
Page 174: ...4 5 MEMORANDUM HYUNDAI HEAVY INDUSTRIES CO LTD CONSTRUCTION EQUIPMENT DIV ...
Page 536: ...8 108 125LCR8TM30 Turn casing 1 upside down and remove oil seal 3 using jig 29 ...
Page 566: ...8 138 Remove lock nut 22 and then boot 23 14 36078RL14 2507ARL10 ...