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Backhoe loses power

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Mike M.

11-12-1998 11:41:24




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I have a Henry loader & backhoe on a '59 Allis-Chalmers D14. The backhoe keeps losing power intermittantly...then will regain itself back to normal power. I'm in the process of digging stumps & when the backhoe loses power, it's usually in the middle of digging. It loses power to the extent that I can only lift the boom by "bumping" the lever in small little movements...then the boom will slowly creep back up...about 1 inch at a time. I have changed the oil filter twice & even cleaned the main relief valve screen. Nothing yet has solved the mystery. The fluid level is up to the full mark. Any help on this strange problem would be greatly appreciated.

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Joe Fabregas

11-15-1998 07:49:13




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 Re: Backhoe loses power in reply to Mike M., 11-12-1998 11:41:24  
I have a loader/backhoe with the pump hung off the front. There is a flange/shaft/flange/sprocket welded together and bolted to the crank pully. The pump has a sprocket/flange on it. The two sprockets are connected with a double row chain to take up any mis-alignment. One of the sprockets broke free from the flange but had enough meat to still turn without a load. Re-welded it and we were back in business. Good luck, Joe Fabregas jfabregas@aol.com

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RickB.

11-15-1998 06:15:29




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 Re: Backhoe loses power in reply to Mike M., 11-12-1998 11:41:24  
: I would check the relief valve, it may be opening properly, or maybe a little too soon, and then not closing all the way till the tractor is shut off, causing a lack of operating pressure. This would cause ALL functions to be lazy if the relief is the problem. There may be circuit relief valves on the crowd and / or boom valve circuit that would cause like problems on just one function.



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Mike M.

11-19-1998 17:41:02




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 Re: Re: Backhoe loses power in reply to RickB., 11-15-1998 06:15:29  
Thanks Rick B. on you suggestion of the relief valves being "stuck". You were right. I took the 6 control valves apart and and re-sealed them and found the crowd circuit relief valve stuck open...probably from debris in the hydraulic fluid. Also found a piece of stray rawhide near one outrigger spool valve and WATER has been getting in the fluid...that's my next cleaning project. Thanks again.

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JK MN

11-13-1998 09:38:56




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 Re: Backhoe loses power in reply to Mike M., 11-12-1998 11:41:24  

: I have a Henry loader & backhoe on a '59 Allis-Chalmers D14. The backhoe keeps losing power intermittantly...then will regain itself back to normal power. I'm in the process of digging stumps & when the backhoe loses power, it's usually in the middle of digging. It loses power to the extent that I can only lift the boom by "bumping" the lever in small little movements...then the boom will slowly creep back up...about 1 inch at a time. I have changed the oil filter twice & even cleaned the main relief valve screen. Nothing yet has solved the mystery. The fluid level is up to the full mark. Any help on this strange problem would be greatly appreciated.

Mike, Be sure there isn't something in the hyd tank that is plugging the pump inlet. Like a semi-floating rag. Also are there any hoses that connect the hyd tank to the pump inlet that can collapse some of the time, could be just the inside of a hose. If the "hoe" has good power the rest of the time, a good chance is a collapsed hose.

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Mike M.

11-14-1998 06:03:47




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 Re: Re: Backhoe loses power in reply to JK MN, 11-13-1998 09:38:56  
Thanks JK MN...A collapsed hose on the inside only or the rag or debris in the tank are two great thoughts I didn'nt have...both make sense. I'll check things out and let you know.
: : : Mike, Be sure there isn't something in the hyd tank that is plugging the pump inlet. Like a semi-floating rag. Also are there any hoses that connect the hyd tank to the pump inlet that can collapse some of the time, could be just the inside of a hose. If the "hoe" has good power the rest of the time, a good chance is a collapsed hose.

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joe

11-12-1998 14:50:04




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 Re: Backhoe loses power in reply to Mike M., 11-12-1998 11:41:24  
: I have a Henry loader & backhoe on a '59 Allis-Chalmers D14. The backhoe keeps losing power intermittantly...then will regain itself back to normal power. I'm in the process of digging stumps & when the backhoe loses power, it's usually in the middle of digging. It loses power to the extent that I can only lift the boom by "bumping" the lever in small little movements...then the boom will slowly creep back up...about 1 inch at a time. I have changed the oil filter twice & even cleaned the main relief valve screen. Nothing yet has solved the mystery. The fluid level is up to the full mark. Any help on this strange problem would be greatly appreciated.

have you checked the hydraulics? Is there a hydraulic pump on the backhoe itself? If not oh well :)

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Mike M.

11-14-1998 06:08:45




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 Re: Re: Backhoe loses power in reply to joe, 11-12-1998 14:50:04  
Joe, I'm not sure what you mean by "check the hydraulics"...if you mean did I put a gauge on the system, I haven't done that yet. Also, I forgot to mention that the tractor runs the loader & hoe from a seperate front pump on the crank...not off the tractor hydraulic pump.
: :

: have you checked the hydraulics? Is there a hydraulic pump on the backhoe itself? If not oh well :)



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joe

11-12-1998 14:50:01




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 Re: Backhoe loses power in reply to Mike M., 11-12-1998 11:41:24  
: I have a Henry loader & backhoe on a '59 Allis-Chalmers D14. The backhoe keeps losing power intermittantly...then will regain itself back to normal power. I'm in the process of digging stumps & when the backhoe loses power, it's usually in the middle of digging. It loses power to the extent that I can only lift the boom by "bumping" the lever in small little movements...then the boom will slowly creep back up...about 1 inch at a time. I have changed the oil filter twice & even cleaned the main relief valve screen. Nothing yet has solved the mystery. The fluid level is up to the full mark. Any help on this strange problem would be greatly appreciated.

have you checked the hydraulics? Is there a hydraulic pump on the backhoe itself? If not oh well :)

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