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BOOM
6
5
BOOM
5G0AX001
When the control lever is pulled slowly, the boom drops temporarily.
1. Check the load check valve in the control valve.
a. Disconnect the control valve end of the hose con-
necting the control valve and the boom cylinder
together.
b. Connect the disconnected hose to the arm or
bucket block.
c. Operate the boom cylinder.
If the boom cylinder operates normally, it indi-
cates that the load check valve is faulty.
Before performing steps a to c above, set the ma-
chine posture as follows.
• Fully extend the bucket cylinder, fully retract the
arm cylinder, and rest the bucket on the ground.
When the spool first starts to pull, the oil pressure is
low and the flow rate is low. If the load check valve is
faulty, the oil will temporarily flow backward due to
the load applied to the boom cylinder. As a result, the
boom temporarily drops.
2. Check for leakage inside the boom cylinder.
If the oil flows from the head side (A) to the rod side
(B) due to a faulty boom cylinder piston or tube, the
boom temporarily drops because of the low oil pres-
sure and small flow rate when the spool first starts to
pull. Also, the cylinder will have insufficient drive
force. However, the amount of spontaneous drop will
also be large in this case.
• Check the cylinder.
“Boom cylinder is slow or lacks force, 5. Check
for boom cylinder.”
1
Check the load check
valve in the control valve.
Faulty
Repair or replace the housing
block.
Normal
2
Check for leakage inside
the boom cylinder.
Faulty
Repair or replace the boom
cylinder.
Содержание TB215R
Страница 1: ...CC8E005 WETB215R_A XI Seral No 215000003...
Страница 3: ...SAFETY 1...
Страница 13: ...SERVICE DATA 2...
Страница 16: ...SERVICE DATA DIMENSIONAL DRAWING 3 2 DIMENSIONAL DRAWING 2A0AX001 Operating range 2A0AX02...
Страница 45: ...SERVICE DATA HYDRAULIC CIRCUIT DIAGRAM 1 2 HYDRAULIC CIRCUIT DIAGRAM 2F0AX001 HYDRAULIC CIRCUIT DIAGRAM...
Страница 51: ...SERVICE DATA ELECTRICAL CIRCUIT DIAGRAM 2 2 ELECTRICAL CIRCUIT DIAGRAM 2G0AX00 Electrical Schematic Diagram...
Страница 52: ...SERVICE DATA WIRE HARNESS DIAGRAM 1 2 WIRE HARNESS DIAGRAM 2H0AX00 WIRE HARNESS DIAGRAM Wiring diagram...
Страница 53: ...SERVICE DATA WIRE HARNESS DIAGRAM 2 2 WIRE HARNESS DIAGRAM 2H0AX00 Body harness 03342 68000...
Страница 54: ...SERVICE DATA WIRE HARNESS DIAGRAM 3 2 WIRE HARNESS DIAGRAM 2H0AX00...
Страница 55: ...SERVICE DATA WIRE HARNESS DIAGRAM 4 2 WIRE HARNESS DIAGRAM 2H0AX00...
Страница 56: ...SERVICE DATA WIRE HARNESS DIAGRAM 5 2 WIRE HARNESS DIAGRAM 2H0AX00...
Страница 57: ...SERVICE DATA WIRE HARNESS DIAGRAM 6 2 WIRE HARNESS DIAGRAM 2H0AX00...
Страница 58: ...FUNCTION 3...
Страница 88: ...DISASSEMBLY AND ASSEMBLY 4...
Страница 90: ...DISASSEMBLY AND ASSEMBLY SERVICE STANDARDS 2 4 SERVICE STANDARDS 4A0AX00 Clearance for pin and bushing...
Страница 118: ...DISASSEMBLY AND ASSEMBLY UPPER FRAME 6 4 UPPER FRAME 4E0AX00 CANOPY Construction 1 Canopy 2 Roof...
Страница 120: ...DISASSEMBLY AND ASSEMBLY OPERATING DEVICE 1 4 OPERATING DEVICE 4F0AX00 OPERATING DEVICE Control levers Construction...
Страница 125: ...DISASSEMBLY AND ASSEMBLY OPERATING DEVICE 6 4 OPERATING DEVICE 4F0AX00 Hydraulic piping...
Страница 127: ...DISASSEMBLY AND ASSEMBLY ATTACHMENTS 1 4 ATTACHMENTS 4G0AX001 ATTACHMENTS Hoe attachment Construction...
Страница 130: ...DISASSEMBLY AND ASSEMBLY ATTACHMENTS 4 4 ATTACHMENTS 4G0AX001 34 Blade 35 Blade cylinder 36 Pin 37 Plate R 38 Plate L...
Страница 230: ......
Страница 232: ...TROUBLESHOOTING 5...
Страница 287: ...Other 6...