OC3 HG Oliver tractor skidder project.

Kbeitz · November 26, 2015, 03:17:03 PM

I bought this tractor many years ago. The engine needed work and I was told car engines run way to fast
to use. I bought it because it has the best sprockets and tracks that i have ever seen on a HG.
A few weeks ago I found and bought a Kubota reefer engine from the junkyard.
I was told that this is a slow RPM engine. It has no clutch so I'm going to drive a hydraulic pump to
feed a hydraulic motor that will be attached to the tyranny. Any thoughts ?

redprospector · November 26, 2015, 03:30:11 PM

I think you can come up with a clutch for that little engine way more economically than you can set up a hydraulic system that will do what you're wanting to do.

starmac · November 26, 2015, 05:50:32 PM

I was looking on craigslist this morning and there was an old cat track loader powered by a 305 chebby. lol They claimed everything worked. I reckon where there is a will there is a way.
I am thinking if you can come up with a flywheel for a clutch, everything else would be fairly easy to source.

coxy · November 26, 2015, 05:58:05 PM

I know where there is one of them complete the tracks are junk but it ran good if your looking send me a pm coxy

Brian_Rhoad · November 26, 2015, 06:02:53 PM

Here's a place in Ephrata PA that has Oliver parts.

http://www.olivercletrac.com/

Gearbox · November 26, 2015, 08:22:25 PM

One of my freinds took 2 set's of undercarrigs and made a high drive with 2 front idlers on each side and 5 rolers . The finals are not as strong as the newer stuff . with the hydraulic and that engine at about 40 hp at 3400 or somewhere in there . Befor you get to far make sure that the govener will let you control the speed . Some reefer engines would only run at 1 RPM fixed .

MT logger · November 26, 2015, 08:54:05 PM

a lot of adapters for v2203 Kubota engines at phoenix and parts barn

gww · November 26, 2015, 09:10:06 PM

kbeitz

QuoteAny thoughts ?

Just one thought. You have the coolest stuff

Cheers
gww

Don_Papenburg · November 26, 2015, 10:47:01 PM

Any Kabota dealer aught to have a flywheel and a clutch for them engines . It would be a lot cheaper then hyd. pump/ motor drive . smoother also . If you still want to go that route get a hydrostatic motor / pump combo from a case combine . They are set up with the motor separate from the pump and the motor mounts outside the trans.

starmac · November 26, 2015, 10:55:56 PM

You might also look at the hydrastatic drive setup on the old military bomb loaders.
If they are heavy enough for the job, it would be very simple to mate one to your rig.
They can be come by for cheap sometimes too.

Ford_man · November 27, 2015, 07:04:33 AM

The original Hercules engine was rated at 14HP at 1700 Rpm ( I think). If you could find an old commercial lawn mower you could get the hydro drive and pump from that. I have a JD 935 that is 23 HP I am sure that would work. I also know where there is one without an engine.

Kbeitz · November 27, 2015, 08:40:26 AM

One problem I would have using a clutch is that my new engine sits above the frame.
The drive shaft would not line up. Being that the engine might have a fix RPM should not be a problem.
Using a hydraulic pump and motor I can pick any rpm on the hydro motor I need. I will be useing
this spring loaded hydro valve To control my speed and direction.
I will still have all the gears and the hydro. The leaver will be replaced with a foot control.

Don_Papenburg · November 27, 2015, 10:40:45 AM

Using a true Hydrostatic drive would be a lot smooooother and you would not need that valve . The hydro motor comes with an angle lever controlled by cable that changes the speed .
The hydro motor could be attached to your trans with a little adaptation work

millwright · November 27, 2015, 03:28:50 PM

The hyd drive would be good I have had 3 of the oc3 s and the biggest fault is lack of power when turning. Hyd. Would cure that

Al_Smith · November 27, 2015, 04:31:00 PM

I had an HG which is the same machine in essence .The short fall of the planetary steering is it increases the speed on the outside turning track which requires more power than running straight ahead .

That original Hercules was probably closer to 22 HP shaft HP but the drawbar HP would be a lower rating .

I've seen some that used a gear reducer between the tranny and the rear drive .Little thing sat in place of the short drive shaft .It gave the crawler a good granny gear and so equipted you couldn't stall it .Just sat there and spun the tracks .

Gearbox · November 27, 2015, 05:32:17 PM

surplus center has a motor control valve 18 gal. 9-5174 that would work well for what you need . A regular cyl. valve is going to be jerkey and hard to feather with your foot . If you already have the valve you show use it to prove up your work then it will be easy to change out later. Gearbox

Kbeitz · November 27, 2015, 06:59:59 PM

This is the control valve I bought.

Hydraulic 4 way, 3 position directional control valve, lever actuated, float (motor spool) center (ports A & B open to tank with pressure blocked in the center postion). Float center spools are primarily used with hydraulic motors. Spring centered (spool will return to neutral when the handle is released). 12 gallons per minute flow rate. 4600 PSI maximum pressure. 360 PSI maximum back pressure at the tank port. Adjustable relief valve 900 to 2900 PSI, factory preset at 1750 PSI. All ports are #8SAE.

Gearbox · November 27, 2015, 09:49:47 PM

That should work . At 12 gal you will have plenty of H P you also won't tear up your finals . Just a tip If it will spin the tracks a little you are at max of what those finals will take . You have added 3 or 400 lbs of weight over that little 4 cyl gas . Set your relief low and work your power up from there . Also you will need a case drain on your motor They will come with plugs in the holes. Gearbox

Kbeitz · November 27, 2015, 11:43:30 PM

Quote from: Gearbox on November 27, 2015, 09:49:47 PM
That should work . At 12 gal you will have plenty of H P you also won't tear up your finals . Just a tip If it will spin the tracks a little you are at max of what those finals will take . You have added 3 or 400 lbs of weight over that little 4 cyl gas . Set your relief low and work your power up from there . Also you will need a case drain on your motor They will come with plugs in the holes. Gearbox

case drain on your motor ?
Do you mean return line to the tank ?

Gearbox · November 28, 2015, 10:51:53 AM

Almost all hyd motors have 1 small plug that you remove and put a small line on to drain the oil that get's between the seal and the rotating unit [ gears ] . If you leave the plug in the oil will push the seal out . This line goes back to tank . Not teed to the return . If you are planing to use a gerotor moter you do not need a case drain . Gearbox

Kbeitz · November 28, 2015, 01:11:25 PM

Is it true that you can use most gear pumps as motors also?

Gearbox · November 28, 2015, 02:13:13 PM

yes if they have case drain holes . also they need to have the same size in and out . if not they will need to be taken apart to reverse rotation for a pump . It has to do with the lube holes in the wear plates . Now you are getting beyond my hydrolic pump motor knowlege . Gearbox

Kbeitz · March 13, 2016, 07:49:56 AM

I wasnt happy with the big beast of the engine sitting on top of the frame.
Yesterday at a farm auction I found this engine. I think I will try it instead...

Gearbox · March 13, 2016, 12:30:41 PM

Sweet but I think you will be low on HP . Keep on colecting stuff and your place will look like mine. One think about it when we want to build we got it .

Remle · March 13, 2016, 03:12:01 PM

Kbeitz

What was the HP of the Kubota reefer engine from the junkyard ? Some one I know was looking for a Kubota replacement engine for a hydraulically driven skid steer and we did not think to look at them as a source for one, if its around 25 to 30 it should work for his needs, his old Kubota engine threw a rod.