Hydraulic Manifold

1964 Ford 4000 Light Industrial w/SOS

I'm over cautious when it comes to bolt torque, don't have a full blown machine shop, and hate to have to fight broken bolts or broken parts.

The question I have is for bolt torque for the bolts holding the manifold to the transmission.

I know the manifold is cast, and have seen several pictures of cracked manifolds due to over-tightening.

In the tractor spec sheet from John Smith's page I found the torque for the two bolts holding the pump to the block at 18-21 ft. lbs.

But I can't seem to find the torque for the manifold to the trans.

I know it has to be 'snug' because its two flat surfaces with the O-rings that holds up to 2000 lbs of hydraulic pressure, but I don't want to crack a manifold either.

Any help will be appreciated.

Getting real close to firing her off, maybe even tonight, need to fill fluids, mount gas tank and cross my fingers. Got all the wiring finished last night. Starter turns, lights come on, power to coil, just want to prime the oil pump and see what happens.
 
Look at bolt grade specs and torque charts based on material.
See what grg in cast gives ya, then looks at gr2 and com pair
difference.
 
The manifold ears are washers, and you are screwing into a
casting.

Personally, if grab some grade 5, clean the casting threads,
clean the surfaces, put new prints on, and bolt it up till it felt
good, then check it for leaks under load.

While I am sure there is a real spec you are looking for, I can tell
you many of us have not used torque wrenches on all the
fasteners on the tractor. Some? Sure... a good calibrated tug.

If the ears are bent or don't look true, that's more of an issue for
breakage vs straight clamp pressure.
 
The manifold is cast aluminum.

Most cracks are the result of using incorrect O-rings rather than over tightening.

To avoid such issues, I buy manifold O-rings from CNH.

I also install grade 8 flat washers onto the manifold studs/bolts.

Dean
 
" a good calibrated tug"

Gotcha

I thought it was cast aluminum, but wasn't sure, thanks for the confirmation Dean.

I will snug them good and see what happens, I did get new O-Rings from CNH.
 
Make certain that the O-rings are properly positioned in the counterbores.

Improperly positioned O-rings will cause the manifold to crack when the bolts are tigntened.

Dean
 

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