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Bobcat  > General Questions  > Boom won't raise  
 
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 Author Thread: Boom won't raise
Donlberg is not online. Last active: 8/6/2012 5:57:32 PM Donlberg
Joined: 27 Nov 2010
Total Posts: 9
 
Boom won't raise
Posted: 11/27/2010 12:24 PM
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 is not online. Last active: 9/30/2012 7:02:24 AM Kermode
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Joined: 15 Dec 2009
Total Posts: 134
 
Re: Boom won't raise
Posted: 11/27/2010 04:49 PM
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 is not online. Last active: 7/21/2014 8:31:40 PM skidsteer.ca
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Joined: 20 Jan 2006
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Re: Boom won't raise
Posted: 11/28/2010 05:58 AM

There are many possible reasons, Kermode touched on most likely ones. Let us know what you find.

Ken


NH LS 160, S150, S185 Hoe Brusher Grapple Auger, Mixer Tiller Soil Conditioner Trencher Tracks Snow Blade Wood Splitter Stump Grinder Land Plane. Dealer Virnig Erskine Componets Plus Wallenstein Bauma Lite
mrfixitpaul is not online. Last active: 11/25/2012 4:08:16 PM mrfixitpaul
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Joined: 28 Mar 2009
Total Posts: 365
 
Re: Boom won't raise
Posted: 11/28/2010 09:53 AM
Check that the auxiliary hydraulics aren't stuck in detent....the right steering lever controls the auxiliaries.
Donlberg is not online. Last active: 8/6/2012 5:57:32 PM Donlberg
Joined: 27 Nov 2010
Total Posts: 9
 
Re: Boom won't raise
Posted: 11/28/2010 05:16 PM
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 is not online. Last active: 12/21/2014 2:16:06 PM Tazza
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Re: Boom won't raise
Posted: 11/28/2010 07:19 PM

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.


Bobcat 763 burntSadbut i'm working on it!, 04 S150 with air and a smooshed cab, S250 turbo.
Donlberg is not online. Last active: 8/6/2012 5:57:32 PM Donlberg
Joined: 27 Nov 2010
Total Posts: 9
 
Re: Boom won't raise
Posted: 11/30/2010 12:47 PM
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
Donlberg is not online. Last active: 8/6/2012 5:57:32 PM Donlberg
Joined: 27 Nov 2010
Total Posts: 9
 
Re: Boom won't raise
Posted: 12/01/2010 03:57 PM
It was the lift lock solenoid. Don
Tazza is not online. Last active: 12/21/2014 2:16:06 PM Tazza
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Re: Boom won't raise
Posted: 12/01/2010 04:35 PM
Glad it was such a simple fix.

Bobcat 763 burntSadbut i'm working on it!, 04 S150 with air and a smooshed cab, S250 turbo.
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