IH 674 ? 2 reservoirs

I have a 674 IH with a D239 engine. All hydraulics went down on me
at the same time even second controler for loader, 3-point, stearing
would only allow about a 1 in turn about every 500'. I inched
it to a shade tree to work on it. I figured it must be the pump
so I pulled it and had it inspected, was told it was wore out.
(1972 tractor with oringial pump) Have a new one coming.
The problem worring me now is the manual says it has a 9
gal. capacity, but when I drained the fluid the manual shows
2 drain plugs. When I drained the plug below the pump/filter
I got about 4 1/2 Gal. of fluid, when I drained the forward
plug I only got about 1 Pint of fluid. The oil level gauge (befor
I started) showed was at right in the middle of where it is
supposed to be. Do I have a blocked line to the front reservoir,
which I believe is the clutch housing reservoir. or should I
look for another problem? See attached PDF's

Thank you
John Zitkus

I don't think there are 2 reservoirs. Normally there is only one, but there are usually "hills and valleys" inside that prevent all the oil from draining out of one hole without tipping the tractor up on end... Not very practical, so they added holes.

Reading your excerpt from the manual, drain #20 is for the syncromesh transmission. If your tractor does not have syncromesh transmission, meaning you can't shift "on the fly" without grinding gears, I'm thinking that there shouldn't be any oil behind that front plug. Any oil you find there leaked in from the transmission behind.

According to the CaseIH parts book, the Euro spec tractor could have synchromesh, but the North America spec tractor would have a typical crash gearbox.

I'm not 100% sure about that, though. It's not a tractor design I'm familiar with. Hopefully someone will come along and tell me I'm right, or I'm an idiot.

Hi John,
There are 2 chambers in a 674, see caseih.com
parts at:
http://partstore.caseih.com/us/parts-
search.html#epc::mr62746ar372034

There is a transfer pump that is supposed to
keep the hydraulic fluid level even in both
chambers. There is a plug, item #3 in the parts
diagram that can be pulled to allow hydraulic
fluid to flow between the chambers. Most IH
mechanics advise to over fill by 5 to 10
gallons of hydraulic fluid.

There is also a third drain plug under the
right rear axle. If you have a loader installed
the return line from the loader control valves
may go into this drain plug.

I hope the new pump fixes the problem and it is
not the PTO drive splines on the pressure plate
that are stripped.

Good luck
JimB

Thanks was worred about amount of oil
I got out. I'll check for that third plug today
Its not a syncromesh transmission got to stop
to shift

I'll look for the third plug today. had the pump look
at by a Hydro shop they said it was prety badly worn
original 1972 cessna pump. Got one on order hope it
works
Thank you
John Zitkus

Hi John,
There is no syncro on Lo/Hi but 1 to 4 should
be syncro. We had a 674 without T/A and Dad
upgraded to 684 with T/A.

Does your 674 have a T/A?

Take off the inspection plate under the clutch
housing and inspect the pressure plate and PTO
shaft splines. Since you have the hydraulic
pump out, reach in and see if you can turn the
PTO shaft which drives the hydraulic pump. You
should not be able to turn the PTO shaft at the
hydraulic pump drive gear.
It is unusual that the hydraulic pump would
quite all of a sudden unless the drive gear key
shears or the PTO drive splines strip. Usually
hydraulic pumps gradually become weaker over
time and you have to rev engine to max to lift
anything with the loader. Other possibilities
are blown O-rings or other problems in MCV.

JimB

JimB2,
not much of a tractor mechanic, but I checked all the
gears in the pump enclosure none would move more than app. 1/8". Just behind ( to the rear ) the pump gear there is a
cluch like device it moves app. 360 Deg. and hits a stop.
I am thinking this is to engage the PTO. I am starting to
put my money on the MCV if the pump dosen't fix the
problem. I did not look in the clutch inspection plate,
(wasn't sure which plate it was the one with 11 bolts
or the two bolt one with the cottor pin sticking out the
bottom). also wasn't sure what you meant by T/A.
This tractor has had many modifcations it appears many
things have been bypassed or disconected. I am still trying
to figure out where to connect a new Tachometer cable.
allmost all wireing harness has been removed.
Thanks in advance for any help you can give me.
I just recently retired and want to work on these
great work horses as a passtime and to work my farm
Thank You
John Zitkus

Hi John,
My first recommendation would to be to purchase
a service manual if you don't already have one.
The manuals are available from this web site.
The 574/674 are basically the same tractor with
D-239 engine but fuel pump on 574 is set to 52
HP and 674 is set to 62 HP and 674 may have
larger rear tires.
Re T/A (Torque Amplifier)- gives a change on
the go Hi/Lo in every gear, gives the 674 16
FWD and 8 Rev gears. I believe on 674 it was an
extra cost item and on new model 684 it was a
standard item. You can tell if you have a T/A
by having a lever on left side of steering
column that looks the same as the throttle
lever. Forward T/A is in HI(Direct drive), back
towards seat T/A is in LO range.

Re PTO shaft not turning that is a good sign.
Yes that is PTO clutch pack you see.

Re clutch inspection plate is sheet metal plate
on bottom of bell howsing closest to rear of
engine. I believe 2 bolts is correct plate.

The tach cable goes along left side of engine
and behind the fan and over towards left font
side of engine there is a "L" shaped tach drive
assembly that is screwed into the timing gear
cover.

674 is a great tractor and D-239 German Diesel
is a great engine. Just one caution and that is
REMEMBER to RELEASE the BARKING BRAKE before
driving the tractor. Newer 95 Series and above
tractors have replace parking brake dash light
with a flashing light when parking brake is
engaged.

Have a great retirement and enjoy your 674. I
have spend many hours in the seat of a 674/684.
Always will to help if I can.

JimB