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Re: Blew Out Hydraulic Chamber

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Author  [Modern View]

08-24-2013 08:47:05

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How much weight did you have on the lift? The system is capable of lifting 800# or more without exceeding the pressure relief setting of 1600 PSI. So unless you had considerably more than that on the lift I would rule out a defective over pressure relief valve.

I'd be inclined to suspect something got caught between the mating surfaces of chamber and pump (e.g. piece of old gasket material). A high spot like that may have caused the housing to stress fracture when you tightened down the cap screws. Doesn't take much unevenness to fracture hollow cast iron sections......


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Bill VH

08-31-2013 12:21:21

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 Re: Blew Out Hydraulic Chamber in reply to TheOldHokie, 08-24-2013 08:47:05  

Well, I dropped the pump. The pictures are attached. One picture shows the section that was blown out. In the same picture along the front, from chamber to chamber, through the threaded section you can see a good size crack.

Also, I did find a piece of gasket on the bottom of the one side. I placed it on the top of the chamber I found it in. I was shocked at the size that was in there. I'm somewhat embarrassed, because I thought I did better work and was more careful than that. I had the whole thing apart and sprayed the whole system before reassembling.

Did the gasket piece cause the cracks, or are the cracks a result of the blowout or overall weakened side camber? I don't know.

In my own mind, I'm thinking that the gasket got in the way of the check valve, got bound up in there and caused some unusual pressure on the system.

I'm going to replace the chamber from a spare that I have.

Thanks for all the help. If you have any other thoughts, I would appreciate them.

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08-31-2013 16:01:35

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 Re: Blew Out Hydraulic Chamber in reply to Bill VH, 08-31-2013 12:21:21  
I'm just guessing, but may be it was a combination of to much muscle on the cap screw and a piece of grit getting caught under there. Thanks for posting pictures might help someone like me.

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Bill VH

08-24-2013 16:03:20

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 Re: Blew Out Hydraulic Chamber in reply to TheOldHokie, 08-24-2013 08:47:05  
It is interesting that you say that. When I cleaned the old gasket off, it was tricky to clean around the alignment pin on the pump base. Couldn't use the razor blade, as I did everywhere else. Scraped it best I could with a screwdriver.

I never would have thought that the chambers might have a little twist or bend from a little extra gasket material. Really a good thought there. Thanks. Once I get a chance to drop the pump I'll take pictures for other to see if interested.


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Bill VH

08-24-2013 17:26:34

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 Re: Blew Out Hydraulic Chamber in reply to Bill VH, 08-24-2013 16:03:20  
Oh, forgot to answer one of your questions. I was trying to lift a wagner loader frame, without the bucket. Just the front end of it, as the back was still on the ground. It was not mounted. I have no idea of the weight. Another person had told me that he had unloaded one of this in the past with a boom. I was using a boom at the time of breakage.

I just assumed that if the pressure was anything over the 1600 pound range, the safety valve would trip and I could never experience an over pressure situation, no matter what the weight. Just figured the weight wouldn't lift if the safety valve was tripping. I don't know if this is the right thinking.

I would say at the time I blew the side chamber, the loader frame was about 3/4 off the ground.

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