Komatsu PC200-5 working device, rotation, detection and adjustment of final drive

(1) Detection and adjustment of pressure of working device, swing and final drive system

1. Hydraulic pump overflow pressure detection

(1) Status of the detected mechanism.

1 For the working device, place each cylinder at the end of the stroke.

2 For the swing mechanism, turn on the swing lock switch.

3 For the running mechanism, pad the pad under the track shoe claw or pad between the drive wheel and the frame to lock the track

The board makes the walking loop overflow.

(2) Start the engine, adjust to the H.O and H modes, and measure the main relief valve pressure when the engine is idling at high speed.

(3) The set pressure of the safety valve at the top of the boom (with the rod cavity) and the travel motor is lower than the set pressure of the main relief valve, so

The measured value is the relief pressure of the safety valve. When operating the travel joystick, the main overflow measured when each side is allowed to overflow

The valve relief pressure is increased from 32. SMPa to 34 MPa (level 2 overflow. CO cancels solenoid valve action).

2. Pressure adjustment of the main relief valve

The two main relief valves are arranged at the uppermost position in the middle of the rear of the main operating valve. The structure is shown in Figure 2 -38.

Show. When the measured pressure value is higher or lower than the pressure value set by the main relief valve, the main relief valve needs to be adjusted.

3. Hydraulic pump overflow pressure detection

(1) Status of the detected mechanism.

1 For the working device, place each cylinder at the end of the stroke.

2 For the swing mechanism, turn on the swing lock switch.

3 For the running mechanism, pad the pad under the track shoe claw or pad between the drive wheel and the frame to lock the track

The board makes the walking loop overflow.

(2) Start the final drive parts, adjust to the H.O and H modes, and measure the main relief valve pressure when the engine is idling at high speed.

4. Main spool 2. Pilot spool 3, 5, 7. Lock nut 4, 8. Set 6. Right angle joint

Figure 2 -38 Main relief valve

(l) Adjust the upper limit of the set pressure. Remove the pilot pressure oil pipe screwed onto the right angle joint 6 and loosen the lock nut 3,

The sleeve 4 is rotated, and the pressure increases when rotated clockwise, and decreases when rotated counterclockwise. When adjusting the set pressure upper limit

When the set pressure lower limit also changes, the set pressure lower limit is adjusted again.

(2) Adjust the lower limit of the set pressure. Loosen the lock nut 7 and rotate the sleeve 8. When the clockwise rotation increases the pressure, counterclockwise

5MPa。 The pressure is reduced by a pressure of 12. 5MPa.

Generally, the pressure of the oil chamber PR is about 1.3 MPa or less, and is about 2.95 MPa at the upper limit of the set pressure.

5. Adjustment of the swing motor safety valve

Two swing motor safety valves are mounted on the hydraulic final drive motor back cover 8, as shown in Figure 2-20. When back

Adjustment is required when the system pressure at the time of turning is higher or lower than the pressure set by the safety valve. First loosen the locking screw on the safety valve

Mother, then turn the adjusting screw, turn clockwise to increase the pressure, counterclockwise to reduce the pressure.

6. Preparation before testing

(1) Remove the two front and rear pressure taps (threads MlOmm × 1.25mm) at the exit of the front and rear pumps, and then install

Install two oil pressure gauges (60MPa).

(2) Lower the working device to the ground, the engine is turned off, operate the joystick several times in a row, and slowly release the fuel tank.

Fill the flap or bleed valve to relieve residual pressure in the tank and place the safety lock lever in the locked position. Measuring time

Pressure oil temperature is 45-55 ° https://www.spfinaldrives.com/