Hydraulic pump isn't

[gettin' too old for this]

Hi new to this site. I have a 13.6 Deli pump driven with a 14hp. Kohler that has seen very little use, less than 20 hrs., over 2 yrs. and while it was working fine two weeks ago now it isn't pumping. Everything has been cleaned and checked but no volume or pressure. See two adjustment points on the pump but do not know which is for pressure relief and which sets switchover pressure point from 1st to 2nd stage any ideas?

 

[djones]

Lets start again, have you checked for a sheared key on the motor shaft ? Is the filter clogged or in need of changing ? Check volume flow by disconnecting the output line from your pump at the control valve (in) and place in a 5 gal pail. Run motor to verify a good flow. Other way is to install a pressure gauge on a tee connection at the inlet of the control valve and run motor. Will have some low pressure when running and high pressure when the lever is moved in either direction, Max pressure comes at the end of the cylinder stroke. Bypass valve then kicks in. Not familiar with a Deli pump so I don't know which adjustment point is which. Just looked at the Manufactures brochure but it doesn't specify which is which. Might be someone else has experience with them and can help you further.

 

[muddstopper]

Agree with djones, I have seen quite a few of those little pumps throw a keyway. I wouldnt turn any knobs until I checked the coupleing between the pumps shaft and the engine shaft. Check that first and if that isnt the problem, then we can trouble shoot a little more.

 

[gettin' too old for this]

Lets start again, have you checked for a sheared key on the motor shaft ? Is the filter clogged or in need of changing ? Check volume flow by disconnecting the output line from your pump at the control valve (in) and place in a 5 gal pail. Run motor to verify a good flow. Other way is to install a pressure gauge on a tee connection at the inlet of the control valve and run motor. Will have some low pressure when running and high pressure when the lever is moved in either direction, Max pressure comes at the end of the cylinder stroke. Bypass valve then kicks in. Not familiar with a Deli pump so I don't know which adjustment point is which. Just looked at the Manufactures brochure but it doesn't specify which is which. Might be someone else has experience with them and can help you further.

Thanks for the reply. Everything has been removed and checked except for internal parts in pump. Pump does turn with some resistance but I think this is just normal gear loading. I should mention that Deli is probably one of the largest manufactures of these small pumps in the world. They are marketed under more names than I can even guess at. If anywhere on a small pump it has DELI stamped on it, it is made by them no matter what the box or sticker says or who it is purchased from. Let's put it this way it would help to read Chinese to understand the website lol.

 

[gettin' too old for this]

Agree with djones, I have seen quite a few of those little pumps throw a keyway. I wouldnt turn any knobs until I checked the coupleing between the pumps shaft and the engine shaft. Check that first and if that isnt the problem, then we can trouble shoot a little more.

Thanks for reply. As I told djones everything mentioned has been checked and there just is such low pressure coming out of pump it will not move ram and just trickles out of return hose with control valve in open position so it has to be internal in the pump.

 

[triptester]

The problem could be a collapsed or blocked suction hose.

 

[gettin' too old for this]

The problem could be a collapsed or blocked suction hose.

Unfortunately all hoses have been removed and checked out, pressure gauge added,return filter changed, tank drained, suction screen removed from tank and checked, pump removed and couplings checked, control valve checked, breather checked. So it leaves nothing else other than a internal pump setting or pump failure. Going to start making incremental changes to the internal pump settings today and if that fails I will order a new cast iron "American Made" pump and tear this pump apart and see what has happened. Wish I had the gear clearance specs etc. on these pumps but no luck finding that out. I will post results on how things go.

 

[djones]

What normally happens to gear pumps is that the brass base plates get some foreign material on them and wears a groove in the plate which causes it to lose pressure. There is a zero clearance between the gear base and the base plates which means it must have oil in the pump before using it. If it is run when dry you severely damage the plates. If the pump turns hard by hand then you more than likely have internal damage. Another problem could also be a stuck relief valve. Before taking anything apart, you can try backing out the set screws on the valves you can see but be sure to count the turns of the screws as you do this and write them down before CRS sets in. (Can't remember ****).

 

[gettin' too old for this]

What normally happens to gear pumps is that the brass base plates get some foreign material on them and wears a groove in the plate which causes it to lose pressure. There is a zero clearance between the gear base and the base plates which means it must have oil in the pump before using it. If it is run when dry you severely damage the plates. If the pump turns hard by hand then you more than likely have internal damage. Another problem could also be a stuck relief valve. Before taking anything apart, you can try backing out the set screws on the valves you can see but be sure to count the turns of the screws as you do this and write them down before CRS sets in. (Can't remember ****).

Ha, love the CRS note. Anyhoo after putting everything back together and turning in pressure adjusting screw all the way and she is working. Adjusting screw had to have loosened up from towing vibration. In fact it is building enough pressure 3500+ psi that it kills the 14hp Kohler with just the ram extended. I have talked to the company that handles warranties to find out specs for initial setting of adjustment screw and they put me in touch with company that built the splitter and they are going to have a engineer from the company that built the pump contact me tomorrow. Happy, Happy, Joy, Joy. I will pass on info as I get it. Thanks ever so much for your help. Ps. I see you must like to fish?

 

[Erik B]

@gettin' too old for this Welcome to the site. You will love it here. Where abouts in WI are you located?

 

[djones]

You need to turn the pressure down to 3050 psi. That is the rated spec for your pump. Info found on the DLH fluid pump website. Most single braid hydraulic hoses are only rated at 3600 psi. That gives you a 550 psi buffer zone for sudden bursts of pressure. Don't want hoses blowing up in your face. Believe me it is not fun, especially if the oil is hot. Don't ask, won't tell.

Yes, Wifey and I fish quite often in the summer time. Mostly for large and small mouth bass. Pickerel, Northern pike, walleye, perch, sunnies, crappies and a few other species inhabit our local lakes.

 

[gettin' too old for this]

You need to turn the pressure down to 3050 psi. That is the rated spec for your pump. Info found on the DLH fluid pump website. Most single braid hydraulic hoses are only rated at 3600 psi. That gives you a 550 psi buffer zone for sudden bursts of pressure. Don't want hoses blowing up in your face. Believe me it is not fun, especially if the oil is hot. Don't ask, won't tell.

Yes, Wifey and I fish quite often in the summer time. Mostly for large and small mouth bass. Pickerel, Northern pike, walleye, perch, sunnies, crappies and a few other species inhabit our local lakes.

Thanks for the info. good luck with the fishing.

 

[gettin' too old for this]

@gettin' too old for this Welcome to the site. You will love it here. Where abouts in WI are you located?

About half way between Rapids and Adams Friendship just off Hwy 13 South.

 

[ChoppyChoppy]

I doubt it's set that high. Most box store splitters are set to around 1800-2000 psi.