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Discussion Forum

48 M hydraulics

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12-06-2001 13:46:23

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Finding time to work on my old girl is hard with daylight savings so I thought I would throw out this question before I get into it this weekend. Her hydraulics have never been used, when running and I engage the belly pump the engine loads up until I disengage the pump. Tells me the pump works. Since it has not been used ever, and she is a 48, What should I do to get she in working order? Change oil? Run a hyraulic filter?

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12-06-2001 16:50:11

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 Re: 48 M hydraulics in reply to Busch, 12-06-2001 13:46:23  
If the engine loads when you pull the rod, it tells you things are working and the pump is generating pressure. Don't think there is any filter on the belly pump to service. Just change the oil and put in new non detergent 30 wt oil. Very important that it be NON DETERGENT oil. If you want to find out how good it is working, get a pressure gage (Northern Tool has hydraulic gages) and screw it in one of the outlets and then activate the system to read the pressure. You should get a pressure of 800 to 850 psi.

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Joe Lehman

12-07-2001 13:28:23

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 Re: Re: 48 M hydraulics in reply to Haas, 12-06-2001 16:50:11  
Haas, why is a NON-DETERGENT oil required?


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12-08-2001 20:39:58

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 Re: Re: Re: 48 M hydraulics in reply to Joe Lehman, 12-07-2001 13:28:23  

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12-06-2001 13:57:21

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 Re: 48 M hydraulics in reply to Busch, 12-06-2001 13:46:23  
What are you running the hydraulics to? The engine loading up means it is turning the belly pump, and the oil flow is blocked and going over the relief valve.
Very similar to if you have the line hooked to a cylinder (say, on a loader) and the cylinder bottoms out. The oil has nowhere to go, and the pump is still pumping, so it vents over a relief valve.

In a nutshell

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