Takeuchi TB 250 - TROUBLESHOOTING; Overall machine; Boom, bucket, slew and arm fail to move or are too slow; Traveling

TROUBLESHOOTING
5
5-1
Overall machine .............................................................................................................................................................5-3
No operation is possible. ..........................................................................................................................................5-3
All systems working, but insuf
ficient power. .............................................................................................................. 5-4
Boom, bucket, slew and arm fail to move or ar
e too slow. ........................................................................................5-6
T
raveling ........................................................................................................................................................................ 5-8
Right or left travel is impossible ................................................................................................................................ 5-8
Right or left travel speed dr
ops causing the machine to veer to one side ................................................................5-10
Machine will not travel in 2nd speed
....................................................................................................................... 5-12
Slewing ......................................................................................................................................................................5-15
No slewing ............................................................................................................................................................. 5-15
Does not slew to the right or left ............................................................................................................................. 5-17
Slewing is slow or lacks power ...............................................................................................................................5-19
The machine slews, but the overrun when slewing stops is large
, or slewing cannot be stopped ...........................5-21
When stopped on a slope, the slewing mechanism cannot mainta
in its posture ..................................................... 5-23
Boom ......................................................................................................................................................................... 5-24
The boom cylinder does not move
......................................................................................................................... 5-24
Boom cylinder operation is slow or lacks power
..................................................................................................... 5-26
When the boom contr
ol lever is pulled slowly, the boom drops at first .................................................................... 5-29
Spontaneous dr
op of the bucket is too large .......................................................................................................... 5-30
Arm ............................................................................................................................................................................. 5-31
Arm cylinder does not move ................................................................................................................................... 5-31
Arm cylinder is slow or the power is insuf
ficient. ..................................................................................................... 5-33
Spontaneous dr
op of the arm is too large .............................................................................................................. 5-35
Bucket ......................................................................................................................................................................... 5-36
Bucket cylinder does not move or lacks power
...................................................................................................... 5-36
Spontaneous dr
op of the bucket is too large .......................................................................................................... 5-38
Boom swing ................................................................................................................................................................ 5-39
Swing cylinder does not move ................................................................................................................................ 5-39
Blade ...........................................................................................................................................................................5-41
Blade cylinder does not move or lacks power
........................................................................................................5-41
The spontaneous dr
op of the blade is too large, or the blade cannot support the machine ..................................... 5-43
Auxiliary hydraulics ...................................................................................................................................................... 5-45
Pr
oportional control does not work ......................................................................................................................... 5-45
Piston pump ................................................................................................................................................................ 5-46
Gear pump .................................................................................................................................................................. 5-47
Contr
ol valve ................................................................................................................................................................ 5-48
Pilot valve .................................................................................................................................................................... 5-50
Pr
oportional control solenoid valve ...............................................................................................................................5-51
Cylinders ..................................................................................................................................................................... 5-52
T
ravel motor ................................................................................................................................................................5-53
Slew motor ..................................................................................................................................................................5-55
Air conditioner ............................................................................................................................................................. 5-57