1. Thank you for visiting HeavyEquipmentForums.com! Our objective is to provide industry professionals a place to gather to exchange questions, answers and ideas. We welcome you to register using the "Register" icon at the top of the page. We'd appreciate any help you can offer in spreading the word of our new site. The more members that join, the bigger resource for all to enjoy. Thank you!

Old Hy-Hoe

Discussion in 'Old Iron!' started by Dan83, Sep 30, 2008.

  1. RZucker

    RZucker Senior Member

    Joined:
    Jul 7, 2013
    Messages:
    1,612
    Occupation:
    Mechanic/welder
    Location:
    Wherever I end up
    I loves me some 2 stroke... Especially the Detroits. It's been a while since one has walked into the shop though.
     
    td25c likes this.
  2. td25c

    td25c Senior Member

    Joined:
    Feb 15, 2009
    Messages:
    4,540
    Location:
    indiana
    I'm the same way RZ ! Love them two cycle noise makers .:)

    We wrapped up the demo job by installing the 5' ditch bucket to grade & pull the leftover " shake " off the site . Also separated good beams & stacked them off to the side .

    Customer was so happy he even let us get the ladder back out to tighten up & patch in some missing tin on the remaining structure .

    Time to go bend some nails & break some screws LOL !










    100_4179.JPG



    100_4180.JPG
     
    72hayes and Ilio like this.
  3. td25c

    td25c Senior Member

    Joined:
    Feb 15, 2009
    Messages:
    4,540
    Location:
    indiana
    Sometimes we even get to slop out a pond ..... Love those jobs as no need for a tape measure ....:) 100_4018.JPG
     
    72hayes, Ilio and old-iron-habit like this.
  4. Erockkelly

    Erockkelly New Member

    Joined:
    Jul 3, 2016
    Messages:
    4
    Location:
    Ontario
    Hello, I bought an old hy-hoe 3300 T 1975? I believe it is and was wonder what the two canasters are that are plumbed into the hydraulic system behind the cockpit. Could they be filters?
     
  5. Ilio

    Ilio Member

    Joined:
    Sep 30, 2010
    Messages:
    18
    Occupation:
    Construction
    Location:
    Perth Ont. Canada
    The earlier hoes had only 1 canister.
    They are the return hydraulic filters. Some had 3 for all 3 pumps (hydraulic circuits), but most had 2.
    There may be one more canister/tank there. It is an air tank for the brakes & hydraulic assist, if so equipped.
    The canisters should have 2 filters in each canister, stacked, with a plastic or steel fitting joining them. Readily available. If you need the part #'s, let me know.
    There are 2 to 3 suction filters in the hydraulic tank, that are on a swivel pipe, that you just pull up to access. You don't replace those, just periodically clean them. They are a steel mesh with magnets, placed in opposition to each other, rather than attraction. The magnetic field created by placing them this way, tends to repel small filings & pieces of metal that are then held by the magnet & not sucked into your hydraulic system.
     
    td25c likes this.
  6. Ilio

    Ilio Member

    Joined:
    Sep 30, 2010
    Messages:
    18
    Occupation:
    Construction
    Location:
    Perth Ont. Canada
    Forgot to mention, you can always upgrade to spin on filters, but it's hardly worth it. I did convert the engine oil & fuel fitlers to spin on canisters. They get changed more frequently, so it was worth it.
    The maintenance time for the hyd. filters is longer, so it's hardly worth the conversion.
     
    td25c likes this.
  7. td25c

    td25c Senior Member

    Joined:
    Feb 15, 2009
    Messages:
    4,540
    Location:
    indiana
    Our 3300 only has 1 hydro filter . Even has a mechanical restriction indicator on top .

    Not sure of the filter number but they sure resemble two Detroit Diesel oil filters stacked together .:)
     
  8. Willie B

    Willie B Senior Member

    Joined:
    Jan 3, 2016
    Messages:
    1,086
    Location:
    Mount Tabor VT
     
  9. Ilio

    Ilio Member

    Joined:
    Sep 30, 2010
    Messages:
    18
    Occupation:
    Construction
    Location:
    Perth Ont. Canada
    Hey td! Just looked at the filter #'s that I use. They are Wix filters, # 51434. Each canister takes 2 filters. I've had really good luck with these ones.
    Checked my 6000TT to make sure (getting older & way too much iron to remember lol) on the filter system. It has 3. One for each circuit.
    Looked at my 5000TT parts machine, it has the standard one filter housing. When there is only 1 filter housing, they usually always have it on the swing circuit.
    Be almost the same as the 690
    My other 5000TT is not in the yard (on a job), but I kinda remember 2 on it.
    My 685B had only 1. It would be the same as your 3300. Some of the newer ones had at least 2.
    I had one of the 6000 canisters rupture on a job 2 yrs. ago. Delightful mess!! I was pleasantly surprised to be able to get another canister the next day.
    The restriction indicators are nice, but they had a perpetual leaking issue. I got tired of repairing mine & took the dealers advice & put a bolt in it with an 'O' ring.
    It doesn't affect the bypass spring & i do regular maintenance, so I gave up on the indicator.
     
    td25c likes this.
  10. Ilio

    Ilio Member

    Joined:
    Sep 30, 2010
    Messages:
    18
    Occupation:
    Construction
    Location:
    Perth Ont. Canada
    My cover pi (avatar) is my 5000TT. I'll see if I can upload another pic of it working. Rock lake Job July 09 (10).jpg
     
    72hayes likes this.
  11. Ilio

    Ilio Member

    Joined:
    Sep 30, 2010
    Messages:
    18
    Occupation:
    Construction
    Location:
    Perth Ont. Canada
  12. Ilio

    Ilio Member

    Joined:
    Sep 30, 2010
    Messages:
    18
    Occupation:
    Construction
    Location:
    Perth Ont. Canada
    Here'a pic of the 5000 Rock lake Job July 09 (5).jpg TT beside the 685 B
     
    72hayes, DMiller and td25c like this.
  13. hammerdwn20

    hammerdwn20 Well-Known Member

    Joined:
    Feb 18, 2008
    Messages:
    215
    Occupation:
    pipeline
    Location:
    pa
    machines look very clean!
     
    DMiller likes this.
  14. Ilio

    Ilio Member

    Joined:
    Sep 30, 2010
    Messages:
    18
    Occupation:
    Construction
    Location:
    Perth Ont. Canada
    Thanks hammerdwn! We love the old Hy Hoe here. I used to bug the kids when they were little & they'd be asking asking for a bedtime story & I'd read them stuff from the old Hy Hoe sales brochures about how a Hy Hoe can out trench a cable hoe or some of the semi hydraulic hoes. Like the old steam shovel story about Mary Anne & how she (an old cable hoe) could dig more in a day, than a 100 men could dig in a week!!
    I've got two more modern hoes, a Case CX210 & a Case CX290, but I still love the feel & the flow of the old Hy Hoes. I can run the 5000 & 6000 all day & never get tired & they don't have computers. The only reason that I went for the 2 Case machines was that they offered a free swing function & the municipality wanted a newer machine for a contract. In the end, they liked the Hy Hoe better!! I love a free swinger!
    Here's a pic of the 5000 in the sand pit & a frontal shot of the 6000 between the truck & the 210 Case machines,the lake 070.JPG Lloyds Pit (7).jpg
     
    72hayes, old-iron-habit and td25c like this.
  15. hammerdwn20

    hammerdwn20 Well-Known Member

    Joined:
    Feb 18, 2008
    Messages:
    215
    Occupation:
    pipeline
    Location:
    pa
    My 685 has Aux hydraulics. Is it supposed to be a self centering valve spool? My lever is stiff and Im not sure what way is off or on. No rpm change like its setting a relief off if i move it either. I just want to make sure its "off"
     
    td25c likes this.
  16. Ilio

    Ilio Member

    Joined:
    Sep 30, 2010
    Messages:
    18
    Occupation:
    Construction
    Location:
    Perth Ont. Canada
    You're right! The 685, along with most of the Hy Hoe line (not the 6000), usually came with an auxiliary hydraulic circuit (minus the plumbing) available to plumb in to. It was in the swing valve circuit. There are 3 plungers in the swing valve. The outer plunger is for the swing circuit to the swing motor. The inner plunger is for the boom assist. The center plunger is the one that is available, to be used (tapped into) for auxiliary functions (hammer, compactor...). If not used, it may stick. Cable controls tend to stick/seize up, more than mechanical. If not used, just disconnect it. Check your linkage for uneven wear points, like on air brakes.
    Also, if you don't like the drift of the free swing & you're not using the aux. circuit, swap the plungers. the swing plunger (unless it's been changed) will be drilled at a right angle to the plunger to help to cushion the swing & the aux. plunger will be solid.
    Unless the spring at the rear of the plunger is broken, or there is a burr or corrosion in the plunger bore or the plunger itself, the sticking is probably in the linkage or cable (they used both). The way the plunger is designed, it is self centering, by virtue of the spring. When you let go of the control, no oil should flow through it. You should notice no bogging down or change in rpm.
    You may notice a 'sticking' problem with the boom assist, as few people ever used this function & the control linkage tended to seize up, stick, below the plate under your foot. The way the boom assist works, is, when you pull or push the control for the boom, if you want more flow you go right or left with it (up or down for boom), you would divert 1/2 of the flow from the swing circuit to the boom cylinders.
    Really increases the lift speed when lifting out of a deep hole, or clearing the edge of a ditch.
    Standard also was a regenerating valve to help cut the lag time on the dipper, to keep the stick moving when it is at 90 degrees to the boom. The valve was mounted behind the dipper cylinder on top of the boom. It channels (re-uses) the return oil from the cylinder (in or out) to the chosen direction of flow. Without it, or if it is worn, the dipper will slow right down, or even pause, for a moment. Hy Hoe called it a 'Hy Hoe exclusive'. When I bought my Case machines I asked them if they could install this feature along with the extra valve on my new machine. They wanted $20,000.00 extra!! So it didn't happen.
    The new hoes get past this lag by decreasing the size of the cylinder barrel (the rod is usually the same size, or it will bend). Reduced area to fill with oil = faster speed = less power pushing away. You still have good breakout force, as they also increase the p.s.i. but it will stall when you push the stick away, against a stump or pile of dirt.
    Hope that's not too much info.
     
  17. hammerdwn20

    hammerdwn20 Well-Known Member

    Joined:
    Feb 18, 2008
    Messages:
    215
    Occupation:
    pipeline
    Location:
    pa
    The 3 spool valve that has the aux hydraulics is not the actual problem. The center spool is not hooked up to and controls. Almost my has all linkages and no cables. My machine has another spool stacked on top of that 3 spool valve and the lever that controls it is right next to the seat on the left side. My machine has the aux plumbing with quick connects out to the end of the boom but it looks like i went down the stick as well.
    Ill get some pictures.

    The almost wobble stick like boom lever functions well in all directions.

    Ill have to look into the regenerating valve on mine because the stick will almost free fall and then pause before moving again.
    I have a newer case machine at work and I experienced some free fall of the stick very slightly when i was doing some hillside work most noticeable when coming back into the ditch after dumping. Ground was pretty steep and was probably more suited for single grouser pads or a winch line.
     
    td25c likes this.
  18. hammerdwn20

    hammerdwn20 Well-Known Member

    Joined:
    Feb 18, 2008
    Messages:
    215
    Occupation:
    pipeline
    Location:
    pa
    This is the 3 spool valve we've been talking about. with swing being the left spool. center is the aux but thats not the one I'm talking about
    20180813_182939.jpg
    See this spool is stacked on top of this double spool. Thats the aux. looks like its one way. Stick is on this valve bank.
    20180813_182950.jpg
    Here is the lever that operates that spool next to the seat. This machine also has an air tank mounted under the engine and a water separator in the cab on the back wall. not sure what it would have been used for
    20180813_183006.jpg

    heres my serial number. anyone know how to decode the year?
    20180813_183309.jpg
     
    td25c likes this.
  19. td25c

    td25c Senior Member

    Joined:
    Feb 15, 2009
    Messages:
    4,540
    Location:
    indiana
    Looks just like the valve bodies on our 3300 . Those were true pilot controls .The pilot had to pull all the way on the stick . :)

    We even have the same operators seat hammerdwn20 . LOL :D
     
    Last edited: Aug 14, 2018
  20. Ilio

    Ilio Member

    Joined:
    Sep 30, 2010
    Messages:
    18
    Occupation:
    Construction
    Location:
    Perth Ont. Canada
    The position of the plunger definitely doesn't look right. It looks engaged & the linkage is on too much of an angle for the clevis or turnbuckle to be mounted that way.
    Unless it has very short travel, but that doesn't make sense, flow wise.
    Is there a cap at the back end of the valve body, on the plunger (this is where the spring/self centering is), like the other plungers?
    This is the one that is sticking?
    Are the hyd. lines that come out of it the ones with the quick connects on them at their ends?
    Looks like they tapped into the dipper & right track motor hyd. circuit for the auxiliary hyd. circuit?
    The hyd. oil flow from the dipper circuit pump will be twice that of the swing circuit.
    There will be an O ring & a wiper (sometimes just a Quad ring) inside the bore of the valve body positioned at either end of the plunger. If the plunger goes too far it can stick there.
    If the linkage is too angled (it will likely stick), the clevis should be turned (with the plunger) so it is 90 degrees from where it is shown, or the linkage bent so it's straight (in line) to the bore.
    Could be set up for a hammer, but that would reduce the flow to the dipper & you need to use that when you're running the hammer.
    If I get home soon enough tomorrow, I'll look at the manual for that machine & see if I can find anything.