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5-36
5
BUCKET
TROUBLESHOOTING
BUCKET
Bucket cylinder does not move or lacks force
1
Check the operation of
actuators other than of
the bucket cylinder
Normal
2
Check the pilot valve
Faulty
Repair or replace the pilot
valve
Normal
3
Check the spool opera-
tion
Faulty
Repair or replace the housing
block
Normal
4
Test by replacing the port
relief valve
Problem solved
The port relief valve is
faulty
Repair or replace the port re-
lief valve
No change
5
Check the bucket cylin-
der.
Faulty
Repair or replace the bucket
cylinder
1. Check the operation of actuators other than of the
bucket cylinder
Determine if only the bucket cylinder is faulty by check-
ing the operation of actuators for the devices listed in
the table on the right. If one of them is faulty, check the
main relief valve and the hydraulic pump (main).
“5-5”
2. Check the pilot valve
Disconnect the hose connecting the pilot valve and the
control valve (bucket block) from the control valve. Fit
the pressure gauge to the hose just disconnected.
• Operate the lever (bucket) and measure the pres-
sure.
• If the pressure is between 0 and 3.4 MPa depending
on the lever angle, the pilot valve is normal.
3. Check the spool operation
“5-32”
Lever to operate
Device to check
Relief valve
Pump
Right travel
TB228, 235: R2
TB228, 235: P2
TB250: R1
TB250: P1
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Summary of Contents for TB 250
Page 1: ......
Page 3: ...1 1 SAFETY 1 Safety alert symbol 1 2 Safety precautions 1 3 Cautions when working 1 9...
Page 36: ...2 24 2 TIGHTENING TORQUE SERVICE DATA...
Page 38: ...2 26 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with options 2 2...
Page 39: ...2 27 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with angle blade and blade oat 1 2...
Page 40: ...2 28 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with angle blade and blade oat 2 2...
Page 41: ...2 29 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with high ow option 1 2...
Page 42: ...2 30 2 HYDRAULIC CIRCUIT DIAGRAM SERVICE DATA Equipped with high ow option 2 2...
Page 49: ......
Page 59: ...2 46 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 60: ...2 47 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 61: ...2 48 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 62: ...2 49 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 63: ...2 50 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 64: ...2 51 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 65: ...2 52 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 66: ...2 53 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 67: ...2 54 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 68: ...2 55 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 69: ...2 56 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 70: ...2 57 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 71: ...2 58 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 72: ...2 59 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 73: ...2 60 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA NAME STANDARD NO...
Page 74: ...2 61 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 75: ...2 62 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 76: ...2 63 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 77: ...2 64 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 78: ...2 65 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 79: ...2 66 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 80: ...2 67 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 81: ...2 68 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA...
Page 92: ...3 11 3 CONTROL VALVE FUNCTION...
Page 108: ...4 3 4 SERVICE STANDARDS DISASSEMBLY AND ASSEMBLY Clearance for pin and bushing...
Page 352: ...ENGINE 6 Machine model Mounted engine TB250 4TNV88...