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5
TROUBLESHOOTING
SLEW MOTOR
SLEW MOTOR
If you notice that the noise or heat becomes unusually high, it is likely that there is a fault in the machine. If it occurs, stop
the machine immediately and try to locate the faulty section.
The table below shows the cause of the general problem and action to be taken when such problem occurs in the hydraulic
circuits.
Hydraulic motor, brake valve
Symptoms
How/Where?
Major causes
Remedies
Motor fails to start • No pressure at the motor’s inlet
port
• Set pressure of relief valve is too
low
• Pump faulty
• Control valve faulty
• Set correctly
• Repair or replace
• Repair or replace
• There is pressure at the motor’s
inlet port
• Load is too heavy
• Hydraulic motor is faulty
• Reduction gears are faulty
• Reduce the load
• Repair or replace
• Replace the reduc-
tion gears
Motor does not
speed up
• Pump discharge is insufficient
• Too much drain from the pump
• Repair or replace
the pump
• Functional problem of the motor
• Drop in the motor’s volumetric ef-
ficiency
• Replace the motor
Oil is leaking
• Leaking from an oil seal
• Lip is faulty
• Replace the oil seal
• Leaking from the mating surface
• Bolts are loose
• O-ring is faulty
• Mating surface is scratched
• Retighten the bolts
• Replace
• Repair the surface
with a grindstone or
sand paper
Motor produces
abnormal noise
• Noise in the piping
• Piping support is faulty
• Clamp the piping
Temperature
in-
crease at the re-
duction gears
• Lubricating oil
• Oil level is low
• Hydraulic oil is entered
• Add oil
• Replace the reduc-
tion gears
• Gear unit
• Bearings are damaged
• Gear surfaces are damaged
• Replace the reduc-
tion gears
• Replace the reduc-
tion gears
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...
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Page 73: ...2 60 2 WIRE HARNESS WIRING DIAGRAM SERVICE DATA NAME STANDARD NO...
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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...