dynahoe hydraulics?

[smthop150]

are the hydraulics on the hoe supposed to be slow or at moderate rate?
i have dynahoe 160 or 190 dont know for sure. u have to let off one lever to the get the other levers action. could it be that the pump is bad or needs a rebuild? email me your thoughts

thanks

smthop150

[Steve Frazier]

Welcome to Heavy Equipment Forums.com!!:drinkup

On any hydraulic machine, the work rate of the circuit you are using will decline if you open another circuit at the same time. The pump works at an established rate and the more circuits that are open simultaneously, the slower each circuit will get. I'd compare it to flushing a toilet while taking a shower. Some of your water pressure is diverted to refill the toilet, the same thing happens with your machine. Your hydraulic pressure is being used to do two things at once.

Older machines did not have the high capacity pumps that today's do, and the pressure drop would be much more noticeable. It could very well be that your pump is worn as well, a pressure test would determine this.

[Squizzy246B]

:cool: What Steve said..you have a machine with a constant displacement pump..if you want more its a case of making it spin faster. Many/most of todays machines have extremely responsive governors and variable displacement pumps. In short, when you multi function...more than one circuit open...the pump ups the ante and the governor keeps the engine speed on the boil to handle the work load....all sounds good in theory :) doesn't always work like that because the pump has a limit to how much it can move. Manufacturer's try and cover the demand by adding more pumps for different tasks..one pump will be for making the machine move or steer, another will be for implements and another still for booms or loader arms.

And welcome

[smthop150]

u said to do a pressure test? where should i do it and how much psi?

[Steve Frazier]

I'm not all that familiar with the process. There should be a test port on the hydraulic system somehwere that you would hook the pressure gauges to. I've only seen them in toolboxes, they look something like HVAC gauges. A heavy equipment dealer should be able to test it for you.

[Jeff D.]

Normally it would be between the pump output,and the first control inline,for checking the pumps working pressure.You'de cycle a control to it's limits,and then check to see where the pressure peaks at.It should top out a the pressure limit cutout,around 1500psi min. and up,depending on the systems design.

If that were to fall within spec's,then you'de move further down the system,checking pressures at various points,to see if they fall below spec's at any point.

You may also be able to see a restriction,if the pumps pressure is above normal,while no circuits are in use.(should be very low w/o any)

There's a million different design's,but often there'll be ports with plugs in them that can be removed,to connect you pressure gauges too,for checking pressure in that particular line.

These won't give you volume figures,but they may be able to calculate them by pressure drop while a circuit is in cycle.

[Cat420]

My dad's cousin had a Dynahoe years ago. He bought it dirt cheap from some guy, because it had the same problem that you describe. They checked the filter first, because it was easiest and it was fine. They ended up putting a new hydraulic pump in and said it was an absolute beast from then on. Sounds like that's your problem. It was easily 20 years ago, but I don't think that it was too expensive.

[dirthog]

you can check the pressure but that will tell you little about why its slow you need to check the flow even a worn pump inless its completely junk will build pressure the flow is what effects speed

[littleplows]

Cat420
Do you know or could you find out for me what pump they used in that Dynahoe. I'm in the middle of rebuilding a 190-4 and would like to do some upgrades to it one being the Hydro pump the other being the Tranny pump.

[Countryboy]

Welcome to HEF littleplows! :drinkup

[Cat420]

I wish I could be more help. I was probably only a few years old, if I was even born yet, when they had the Dynahoe and my dad only helped his cousin's crew when they were shorthanded, so he wouldn't know either. Sorry.

[littleplows]

Thanks for the kind welcome

I'm looking for anything dealing with Dynahoes 190-4 to be specific. I would really like to find someone who has rebuilt them and installed the bigger pumps in them.. Do you know anyone who could help????

[GPS Equ.co.]

are the hydraulics on the hoe supposed to be slow or at moderate rate?
i have dynahoe 160 or 190 dont know for sure. u have to let off one lever to the get the other levers action. could it be that the pump is bad or needs a rebuild? email me your thoughts

thanks

smthop150

160 mod. diggs 16 ft. 190 diggs 19 ft. thats how you know what dynahoe you have.. hyd. presser is 1750 psi. it can be checked from the loader valve on the side with the pipe plug in it. I have operators manuals for the 160 and 190 and parts book also... your pump is a vickers and can be rebuilt it mite cost about
450.00 to 700.00 its been a long time i have had one rebuilt.. phone 614-231-0096 i also stock parts too...

[GPS Equ.co.]

Cat420
Do you know or could you find out for me what pump they used in that Dynahoe. I'm in the middle of rebuilding a 190-4 and would like to do some upgrades to it one being the Hydro pump the other being the Tranny pump.

hyd. pump is a vickers... but i would need your ser. no. i will look in my parts book tomorrow to see what pump is in the trans....jim gps equ.

[mikef87]

I started off with dynahoes those things will push like a dozer and dig like an excavator. they were slow but very powerful. Like everyone else said check that pump its more than likely that. Are you using this for toying around your property or to use on jobs?