NAA '53 hydraulics

I am getting ready to start a rebuild of my whole hydraulics system, from pump to lift assembly. I need help with which pieces to purchase.

I am going to have to replace some seals where my pump is because when under stress it leaks from around where the in and out pipes connect to the pump underside. I have the pump that is side mounted to the crank houseing (rpm guage hooks up to end of it). Do i need to get the rebuild kit for the pump just to replace those two seals, is it best to rebuild the pump since i have it taken off??

Main hydraulics:
I know first off to drain the fluid from all three plugs (transmission front middle and rear plugs) and before i do so to take off the cover"s on the side and see if it is squirting fluid from the piston area, but since i have decided to take it all apart i"m going to skip that step. What i need to know, is there a rebuild kit for the valve/piston assembly?? i"m gonna see if i can find my original posts explaining what happened to cause my hydraulics problems.

All i know is that somedays it will pick up but somedays it just stays at the dropped position, its has put in me in a position where i was dragging my manure pile and made me get stuck cause the dern thing wouldn"t pick up the blade.

Any info will help, i have a link to zane"s hydraulic rebuild page, i think its Zane and I also know I will need the I&T manual, F-04 i think. What else is there??

I would get the full piston pump rebuild kit for about $35. You may need to also obtain a oil seal and needle bearing for the pump snout, and maybe a new wobble shaft - you won't know until you open the pump up. Go ahead and fix everything you need to while you have it open.

First off, if you are only working on the hydraulics, you do not need to drain all three chambers. On an NAA tractor, the tranny, hydraulic, and differential sections are seperated - you will only need to drain the center hydraulic section. There is a lift cover repait kit available for the lift cover and new hydraulic piston ring and leather backup ring for about $9. That said - it is only about $9 for a reason. I suggest that in addition to this kit, you also get a new piston ring, neoprene backup ring, lift cover gasket, and all o-rings from your local New Holland dealer - they are MUCH better. The picture here is a comparison of the Tisco ring on the left to the NH one on the right - see what mean? The gasket that is on the backside of the piston chamber is not in ANY kit, so take real good care not to damage it. You can still get the saftey valve new from NH dealers, but the rest of the valves you will have to find used I think.

I highly recommend the NH spec 134d hydraulic fluid, and make sure to clean your hydraulic chamber out with kerosene while you have the lift cover off to get any water and sludge out.

Lastly - send me an email and I will forward you a copy of Ramrod's excellent step by step NAA lift cover adjustment document with pics and tips/tricks. And also a template to the no longer available gasket I mentioned above if you do end up damaging yours and need to fabricate another.

Good luck,
Dan