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Case Tractors Discussion Forum

Case dc hydralic and pto clutch questions

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12-03-2019 07:16:36

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How strong is the hydraulic system on the later DC's? On the live pto clutch were there any issues, was it weak? (its not a big unit) size wise. On any I been around they did not use the hydraulics much just for very simple things. Mine has 3 PTH so I want to use it. Will be a little while before I get to that as I am concentrating on the engine now.

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12-06-2019 16:38:53

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 Re: Case dc hydralic and pto clutch questions in reply to jocco, 12-03-2019 07:16:36  

OOPS Egg on my face. The parts book does list a hydraulic FILTER. If it is more than a fine screen, someone please reply with what kind of a filter it is.

My 49 D had an engine oil pump suction screen bolted into the left side of the oil pan but it was just a fine screen. I never thought of fine screens as true filters.

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Don Rudolph

12-07-2019 07:09:24

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 Re: Case dc hydralic and pto clutch questions in reply to RonSa, 12-06-2019 16:38:53  

The hydraulic filter is a paper, edge wound element. Don

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12-06-2019 11:07:32

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 Re: Case dc hydralic and pto clutch questions in reply to jocco, 12-03-2019 07:16:36  


Responding to your post, I have had several D series with live PTO and live hydraulics.
There are two main enemies of the D series PTO clutch and one main enemy of the hydraulic system---
1. Slippage caused by the PTO clutch adjusted too loose
2. Improper PTO start-up procedure
3. For the hydraulics, it is dirt in the unfiltered hydraulic oil.

As we know, the PTO clutch needs to handle momentary peak loads without slippage--- such as when using a bush hog in brush. Also, most live PTO clutches on many tractors are not designed to handle repeated high torque start-up loads at high engine RPMs.

The PTO clutch needs to be adjusted so there is a strong “detent feel” when the lever engages. The D series engine has good low torque so it will engage most PTO loads at low RPM. The live PTO clutch should last a long time.

The time era of the D series tended to not use hydraulic oil filters. Dirt tends to enter hydraulic oil mainly by—
1. Engaging dirty quick couplers
2. Worn out hydraulic cylinder rod wipers.

As we know, the late D series has a separate, small hydraulic oil reservoir and no fine filter. I don’t remember but the suction pipe may have had a screen to keep out big chunks

The D series hydraulic system was good for its era of time. Its gear pump is more tolerant of dirt than either vane pumps or piston pumps. The gear pump is positioned down low so it keeps its prime. A gear pump is quite tolerant of cavitation. The roller chain drive is extremely tolerant of dirty oil. However, spool valves are not very tolerant of dirty oil.

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John Saeli

12-03-2019 11:17:26

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 Re: Case dc hydralic and pto clutch questions in reply to jocco, 12-03-2019 07:16:36  
The chain drive hyd. systems, such as the DC were excellent systems. More capacity than the pumps used on the tractors that replaced them. A 1953 DC had more Hyd capacity than a 1964 830. After adding shims to the relief valve, our '53 DC would lift a 6 row corn planter full of seed & fertilizer before you could take your hand off the lever. Must use a 4" cyl. for a load like that.

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12-03-2019 08:28:22

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 Re: Case dc hydralic and pto clutch questions in reply to jocco, 12-03-2019 07:16:36  
One more - as far as lifting capacity, our DC's could lift a JD 7000 4 row planter full of dry fertilizer and seed with no problems. That's probably the heaviest thing our DC's would lift.

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12-03-2019 08:24:32

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 Re: Case dc hydralic and pto clutch questions in reply to jocco, 12-03-2019 07:16:36  
I have a 53 DC with awf, live power, eagle hitch, and dual valve hydraulics. I just put a new clutch in about 2 years ago. Other than that, it has been a great tractor. We used it on a 100 cow dairy as 1 of 5 DC's. It was used as a chore tractor, hay, blower duty etc. Never had a problem with the live power or hydraulics. I'm sure the hydraulics are not as stout as they were when new, but it still lifts 3 point implements just fine - which is all I use it now for anyways!

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