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noel from nm

09-05-2006 13:01:35

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noel from nm

09-05-2006 21:28:03

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 Re: INTERNATIONAL 784 in reply to noel from nm, 09-05-2006 13:01:35  
This tractor is a farm auction special. The brakes on it are iffy. I can get brakes on the right side if I pump. The pto shuts down under a large load. The injection pump is stuck at one speed but I tried to bale hay with it just for the fun of it. I got the job done but it was slow. I will change the filter and lube the linkage. Have you ever had the injection pump apart on a 784? I was wondering if a roll pin or something is wrong ion the pump? The remote hyd are strong.

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09-06-2006 17:15:50

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 Re: INTERNATIONAL 784 in reply to noel from nm, 09-05-2006 21:28:03  
Hi Noel, haven't worked on a 784 but have worked on 454, 495 and 684. All these tractors share the same transmission and hydraulic systems. The only difference is the engine size and tire sizes. The only difference with 684 is D239 vs 784 D246 engine. The D246 has a slightly larger bore, everything else is the same.

If the remote hydraulics are strong then there is nothing wrong with hydraulic pump. There is only 1 hydraulic pump behind the hydraulic filter. The pump puts out about 13GPM which is divided by the MCV valve to direct 2.5GPM to power steering, PTO and brakes and remainder goes to 3pt and remotes. Only use IH Hytran or equivalent hydraulic oil as oil supplies lubrication to transmission and rear end plus hydraulics. There is another hydraulic pump that feeds the T/A only. My brother's experience. He had purchased a log splitter that had been used on an older tractor and the cylinder was full of detergent motor oil and this got mixed with the Hytran oil and caused air bubbles that caused spongy brakes.

1)Brakes require bleeding, check the archives on this site under 684 and you should find procedure. Change hydraulic filter and top up hydraulic fluid before attempting to bleed brakes.
2)Re Injection pump, change fuel filter(s) first.
Make sure you have good fuel flow at the inlet pipe to the first fuel filter. Should flow the full of the inlet pipe. These tractors are notorious for getting junk in the fuel tank that sits over the fuel tank outlet and starves the injection pump. Make sure the injection pump throttle and stop/run levers are working properly.
The stop/run lever in the run position should limit against the adjustment screw on the front of the injection pump.

I have had the Bosch injection pump off to replace the lip seal on the front drive shaft but never had reason to open it.

Try some Diesel fuel conditioner.

Hope this helps

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09-05-2006 16:46:56

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 Re: INTERNATIONAL 784 in reply to noel from nm, 09-05-2006 13:01:35  
Re 784 PTO, I assume you mean the PTO slows down or stops turning when under heavy load?
Sometimes it is caused by the control lever linkage becoming seized up with dirt and rust.
Just clean out area and apply your favourite penetrating oil while working control lever.

Other times it is caused by lack of hydraulic pressure to the hydraulically activated PTO clutch (220 to 250 psi). This can be caused by clogged hydraulic filter or MCV valve or weak hydraulic pump. There is a pressure adjustment but requires special tools.

Do not operate the PTO with it slipping or you will burn out the PTO clutch.

Simple things first, clean and lube control arm mechanism, check hydraulic fluid level then replace hydraulic filter.

My experience on these tractors if there is a problem with the hydraulics the first symptom is loss of prime to the brakes. Requires constant bleeding of the brakes. Does the parking brake work? or is the remnants of the parking brake band floating around in the hydraulic system?

Good luck

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Michael Soldan

09-05-2006 15:54:49

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 Re: INTERNATIONAL 784 in reply to noel from nm, 09-05-2006 13:01:35  
A 784 has a trans filter down under your left foot that should be changed on a regular basis, I doubt that it is the cause of your problem but, changing filters and rear end oil at proper intervals eliminates a lot of these problems., I'm sure you'll get some specific answers, good luck wiyh it...Mike in Exeter Ontario

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richard in nz

09-06-2006 01:26:21

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 Re: INTERNATIONAL 784 in reply to Michael Soldan, 09-05-2006 15:54:49  
The brake top up is fed from the pto. If the pto spool valve is maladjusted or the linkage is fouling causing a ristriction in movement of the pto spool valve you will get problems with the pto AND the brakes.

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