Boom won't raise

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Donlberg

Member
Joined
Nov 27, 2010
Messages
9
Have 553 skid steer. main boom will not move. stuck in one position. bucket will operate but cannot raise or lower main boom. Will too much fluid cause problem? What else? Thanks Don
 

Kermode

Well-known member
Joined
Dec 15, 2009
Messages
134
Need more info. Will the boom pedal move or is it stuck? Could be the lock out to the pedal that isn't disengaging. Put a block under the bucket and tilt it down. Will the boom move up or will the machine lift off the ground? if the boom will float then maybe the float control is stuck on. Have you lifted the cab and looked at the control linkage? Maybe the linkage came apart. Too much hyd oil can't be the problem. Too little can be but not too much. I suppose the control valve could have completely failed and be bypassing but I doubt it. It could be jammed maybe. I have seen bits of o-ring jam control spools. Usually electric ones, Manual ones have enough force to open and close them, o-ring or not. The same pump runs the tilt and lift hydraulics so I doubt its the pump. I can't think of anything else off hand but I bet others can.
 

skidsteer.ca

Well-known member
Joined
Jan 20, 2006
Messages
3,853
Need more info. Will the boom pedal move or is it stuck? Could be the lock out to the pedal that isn't disengaging. Put a block under the bucket and tilt it down. Will the boom move up or will the machine lift off the ground? if the boom will float then maybe the float control is stuck on. Have you lifted the cab and looked at the control linkage? Maybe the linkage came apart. Too much hyd oil can't be the problem. Too little can be but not too much. I suppose the control valve could have completely failed and be bypassing but I doubt it. It could be jammed maybe. I have seen bits of o-ring jam control spools. Usually electric ones, Manual ones have enough force to open and close them, o-ring or not. The same pump runs the tilt and lift hydraulics so I doubt its the pump. I can't think of anything else off hand but I bet others can.
There are many possible reasons, Kermode touched on most likely ones. Let us know what you find.
Ken
 
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Donlberg

Member
Joined
Nov 27, 2010
Messages
9
Need more info. Will the boom pedal move or is it stuck? Could be the lock out to the pedal that isn't disengaging. Put a block under the bucket and tilt it down. Will the boom move up or will the machine lift off the ground? if the boom will float then maybe the float control is stuck on. Have you lifted the cab and looked at the control linkage? Maybe the linkage came apart. Too much hyd oil can't be the problem. Too little can be but not too much. I suppose the control valve could have completely failed and be bypassing but I doubt it. It could be jammed maybe. I have seen bits of o-ring jam control spools. Usually electric ones, Manual ones have enough force to open and close them, o-ring or not. The same pump runs the tilt and lift hydraulics so I doubt its the pump. I can't think of anything else off hand but I bet others can.
Thanks for replying: The boom is locked in one position and when I push the pedal up or down the result is the same. It will act as though it's trying to move but doesn't. very similar to the way it would act if the belt was unlatched or the switch was in the off position. I would say it was electrical but for the fact that the bucket control works fine. It was working okay and all at once locked iin one position. I notice you said the pump runs both lift and tillt, so I suspect the electical saftey shut down would affect both also. The engine pulls down when the pedal is depressed as if its trying to lift. I'm calling the dealer tomorrow,to see if they have any ideas. will keep you informed. The pump was replaced a year ago. Don
 

Tazza

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Staff member
Joined
Dec 7, 2004
Messages
16,829
Thanks for replying: The boom is locked in one position and when I push the pedal up or down the result is the same. It will act as though it's trying to move but doesn't. very similar to the way it would act if the belt was unlatched or the switch was in the off position. I would say it was electrical but for the fact that the bucket control works fine. It was working okay and all at once locked iin one position. I notice you said the pump runs both lift and tillt, so I suspect the electical saftey shut down would affect both also. The engine pulls down when the pedal is depressed as if its trying to lift. I'm calling the dealer tomorrow,to see if they have any ideas. will keep you informed. The pump was replaced a year ago. Don
Sounds like your lift lock solenoid. It should be fitted to your control block, it gets powered and unlocks the arms.
Is it a BICS machine? check all the lights are on
Check for power at the coil, check that the coil works too. You can lift the cab and run 12V into the coil, listen for a snap as the plunger unlocks, its very faint, but you can hear it. I don't know if its a 12v coil, so don't just wire it up and leave it on. This is a test only.
 
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Donlberg

Member
Joined
Nov 27, 2010
Messages
9
Sounds like your lift lock solenoid. It should be fitted to your control block, it gets powered and unlocks the arms.
Is it a BICS machine? check all the lights are on
Check for power at the coil, check that the coil works too. You can lift the cab and run 12V into the coil, listen for a snap as the plunger unlocks, its very faint, but you can hear it. I don't know if its a 12v coil, so don't just wire it up and leave it on. This is a test only.
Checked out lift solenoid, did not click but had continuity through coil. After removing complete coil and plunger it seems to perform on the bench. Sometimes though it may be intermitant. Were ordering a new part as it's too much work removing everything to take a chance. Thanks agian for your help. Don
 
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Donlberg

Member
Joined
Nov 27, 2010
Messages
9
Checked out lift solenoid, did not click but had continuity through coil. After removing complete coil and plunger it seems to perform on the bench. Sometimes though it may be intermitant. Were ordering a new part as it's too much work removing everything to take a chance. Thanks agian for your help. Don
It was the lift lock solenoid. Don
 

CMR421

New member
Joined
Jul 12, 2022
Messages
1
I have a Clark Bobcat 530. The boom wont lift with a load but can be lifted without but goes very slow.
 

Hobbyman

New member
Joined
Aug 24, 2022
Messages
1
Thanks for replying: The boom is locked in one position and when I push the pedal up or down the result is the same. It will act as though it's trying to move but doesn't. very similar to the way it would act if the belt was unlatched or the switch was in the off position. I would say it was electrical but for the fact that the bucket control works fine. It was working okay and all at once locked iin one position. I notice you said the pump runs both lift and tillt, so I suspect the electical saftey shut down would affect both also. The engine pulls down when the pedal is depressed as if its trying to lift. I'm calling the dealer tomorrow,to see if they have any ideas. will keep you informed. The pump was replaced a year ago.


Look under your seat to the right down by the valve where the 2 rods are up against the wall there is a selinoid that 2 wires hook up to. Check that both wires are hooked up. That was exactly what mine was doing.
 

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