Thar She Blows (backhoe hose)

bhayden

Member
I know, I should have changed this [i:d679d53ab9]before[/i:d679d53ab9] it let go :oops:

, on Flickr

FWIW, this is one of the hoses that controls the bucket on an old (circa mid 1960's) Parker backhoe attached to my '61 Fordson Dexta. The hydraulic system is separate from the tractor's and driven by a pump mounted directly to the PTO:

on Flickr

I'm guessing the "plug" in the three o'clock position is the drain? It's likely long past time to drain (flush?) the system and replace the fluid. Any thoughts on what ISO grade I should use; 32, 48, 64? Or is there something specific I should be looking for in the grade/spec/etc.

I figure now is a good time to replace the gauge that died:

on Flickr

Any thoughts on how to bleed the air out of the system or is will this take care of it's self?
 
Doesn't take long!!One giant flush of oil.......I blew a main hose on a Hydroswing swather once. Pumped all the oil before I could get the PTO shut offSprayed/'Gysered' straight up. oil EVERYWHERE. The air should 'vent' by working the controls back and forth a few times.
 
"I'm guessing the "plug" in the three o'clock position is the drain?"

I have no "insider knowledge" about this, but typically a plug at three o'clock would be a fill or level check plug vs. a drain plug at the 6:00 position. YAMMV.
 
Is the plug on top a vent? or a fill, with the plug at 3oclock off, fill from top till it comes out a 3 oclock, looks like that is a drive of some sort, too small for a hydraulic fill. Might need 90# in there Where is the tank? Maybe fill from there.
 
What is that to the right of the levers sticking up looks like a plug or vent? Could that be the
reservoir below that? Where do the hoses from the pump go? That should help you find where the
fluid goes. May be in a hollow section of the framing.
 
Looks like to me the oil tank is right under the control valves. I'd be looking there for a fill and drain.
 
(quoted from post at 06:11:09 09/22/17) Looks like to me the oil tank is right under the control valves. I'd be looking there for a fill and drain.
The main tank is below the control levers. And there is an obvious fill cap on the tank. I'll get a picture when I get home. But there doesn't seem to be a plug at the six o'clock position on the PTO attachment, the lowest point of the system. And there doesn't seem to be, I'll look closer, a drain plug on the main reservoir.

Since the gauge, an afterthought addition by a previous owner, is on a blind stub I wasn't sure if that would trap air and if so might cause problems; like another blown gauge.

Any thoughts on the fluid to use? This is all new to me. Seems that 303 is a Deere spec? Some "Universal" fluids list the viscosity and some don't. Since it's a old system I'm leaning toward a heavier oil in hopes of minimizing leaks. The stuff listed as 36 weight hydraulic fluid cross references as a W5 SAE oil.
 
Looks like a Sherman backhoe. I have one on a 641. I have
replaced many hoses. Never had to bleed anything.
 

Here's a better picture showing the hydraulic reserve tank with filler cap and what I assume is a vent in the background:
on Flickr
On closer examination there is indeed a drain plug on the bottom of the tank:
on Flickr
Drain the tank and call it good? The previous owner did replace the main hydraulic cylinder on the top of the boom (boom in/out) so the fluid isn't too old and appears to be in decent shape (unlike what was left in the transmission :shock: )

I'd be interested to know any more about the Sherman backhoe and if there was any connection between that company and Parker. Parker of course is still big in hydraulic fittings but I don't think they make implements anymore. The last hurray may have been the sale of their lawn sweeper business to Ariens? Anywho, here's a shot of the serial/model plate ID tag.
on Flickr
It's pretty hard to make out but taking a pencil rubbing it looks like the top line is the Part No. 290098. The middle line is a serial number; possibly 145066. The first character could be a T? The last line is identified as "Parker Model" and looks to be 145066.

-Bernie
 
Oops, can't edit but Parker Model No. with the pencil rubbing looks like: 912DDDDDD24
I know in the picture it looks more like it starts out P12 which would make sense (i.e. P for Parker) but the rubbing is pretty clearly a 9.

Found a link to [b:5222db1282][u:5222db1282]Parker History Book[/u:5222db1282][/b:5222db1282] which shows the company made a wide range of products over the years besides hoses, seals and hydraulic cylinders. But no mention of any agricultural products, even the ubiquitous lawn sweepers. Different Parker company or what division might it have been?
 

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