Non David Brown Problem

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rasher
Posts: 78
Joined: Thu Jan 03, 2013 3:16 pm
Location: Derbyshire

Non David Brown Problem

Post by rasher » Mon Oct 17, 2016 7:26 pm

Hi all. Sorry to ask about something other than David Brown but I'm sure someone will be able to help me.

I've got an old winget dumper with a petter ph2 engine. Its been stood for years and over the last 2 days I've got it up and running. The diesel was full of water so that was nearly all it needed to get it up and running.

The issue I have now is after about a hour of running the skip will not tip. Nothing seems to be getting hot but if I leave it for a few hours it will tip a full load of soil. There are no visable hydraulic oil leaks, the steering works off the same hydraulics and this seems to stay working fine, I even parked next to a tree so I could put some weight against the dumper when i turned to check the steering ram was at full strenth and it seemed fine.

if water had got into the hydraulic oil could this cause these issues. I've already put 25 litres of hydraulic oil in but I'm worried what was left in the system when i drained the tank might still be causing my problem.


Thanks for looking.

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case-ih1594
Posts: 1065
Joined: Sun May 12, 2013 10:38 am
Location: Preston

RE: Non David Brown Problem

Post by case-ih1594 » Mon Oct 17, 2016 11:38 pm

Hi, I would have though that water / condensation in the hydraulic oil tank / system would soon lead to the mayonnaise effect where the oil becomes milky looking. If the oil remains clean then it appears there is little water in the system.

It sounds like it could be a perforated pipe or airlock in the system. Although the steering uses the same oil, the steering system is most likely semi-independent.

Alternatively a piece of debris may be blocking a valve, but I'd imagine the valves would be fairly basic.

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rasher
Posts: 78
Joined: Thu Jan 03, 2013 3:16 pm
Location: Derbyshire

RE: Non David Brown Problem

Post by rasher » Tue Oct 18, 2016 11:40 am

It does seem a fairly simple setup. The only thing i dont know about is if i need to somehow bleed the rams. with it being a twin ram setup with power up and down if air is in the rams it has nowhere to go. I've heard all the horror stories about cracking off a pipe and people loosing an arm from oil entering the body so I'd rather have someone tell me how do do it the right way.

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ollek
Posts: 3970
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

RE: Non David Brown Problem

Post by ollek » Tue Oct 18, 2016 5:29 pm

When you send oil into one side of the piston in a double acting cylinder, you open a path for the return oil from the other side of the piston. There is almost no pressure in the return line. A double acting cylinder is bled by fully extending and retracting the rod a few times. No need to open any plugs or connectors.

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dbiow
Posts: 77
Joined: Sat Apr 30, 2016 4:20 pm
Location: Isle of Wight

RE: Non David Brown Problem

Post by dbiow » Tue Oct 18, 2016 9:05 pm

Is the pump or relief valve spring worn just enough to have reduced pressure once to oil warms up and becomes thinner?
885 q cab and 25d on the Isle of Wight.

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rasher
Posts: 78
Joined: Thu Jan 03, 2013 3:16 pm
Location: Derbyshire

RE: Non David Brown Problem

Post by rasher » Wed Oct 19, 2016 9:55 am

Thanks Ollek, Thats what I was hoping to here.


dbiow. I'll try and get some picture of the system so you can see what I'm working with. I dont know where the relief valve would be on a system like this.

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bedwards1966
Posts: 893
Joined: Sun Mar 07, 2010 10:36 pm
Location: North Yorkshire

RE: Non David Brown Problem

Post by bedwards1966 » Wed Oct 19, 2016 9:22 pm

I'd be thinking along the lines of something being worn and leaking internally (pump/valves) and thin oil from being hot. Does it try to tip, and will it tip empty when fully warmed up?

I think I would be tempted to try draining as much oil as possible and replacing it with a thick grade HV (not Triad, this beaks down at temperature) and see if that keeps it workable.

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rasher
Posts: 78
Joined: Thu Jan 03, 2013 3:16 pm
Location: Derbyshire

RE: Non David Brown Problem

Post by rasher » Thu Oct 20, 2016 11:08 am

Im tempted to fit quick release couplings to the pipes from the pump so I can plug my log splitter into the system. my log splitter has the same type of spool valve as the dumper so If the pump works i can swap bits over until i find whats wrong.

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