7G driving me nuts

Been all over this monster since dropping in the replacement transmission, cannot get the hydraulic pump for the transmission to pull and hold prime, oil level is well above the suction points just cannot locate the infiltrating air.

I am suspecting one of the new suction hoses, still have the old ones and will reinstall them one at a time first, still requires full drain and refill, gets old at 31 gallons.

One hose couldn't get fittings I wanted, had to deal with straight ends and I am leaning to that being in a bind installed and keeping the end from seating or maybe being cracked from the stress, will be my own fault if is.

Just received the hydraulic pump head piece and seal set, won't have a day off until the 24th then back to it. Been hard at the new building, should have photo of it tomorrow.
To expand, when I took the old pump off it had a crack in the head mount at one ear, when I went to replace it with the donor unit it was also cracked same place so I tried to reuse the old pump and it still wouldn't draw suction plus the mount ear fully failed, at that point parts got ordered and I stepped back for the time.

Edited by DMiller - 16 Jun 2014 at 8:01pm

Beast is ALIVE! Got the pump head replaced, installed the pump and three new lines this morning AFTER I got off a twelve hour owl shift. Replaced the suction line from the main strainer and the line AGAIN from the scavenge strainer, packed the donor pump with the new head flange with grease and as soon as started had trans pressure.

Honestly is the first time it has ever showed high on the gauge bands, trans is smooth with all speeds forward and reverse, seems more responsive as to light turns now with good flows to everything. Still have to button up the tins and covers, get all back together and put the monster back into a work element but when tried out cold as sits will either slip tracks or push the bucket into soil both high and low forward.


Still have a few gauge lines to change out in here, the pump stands out now with the new head on it, got the parts thru motion industries in Alabama. http://www.MotionIndustries.com.

Thanks Andrew, old machine put a crimp in my schedules but better now!

Glad to see you finally succeeded.  Now the fun begins, playing in the dirt. LOL

I haven't been on here for a year or so; read this thread and glad you got it primed. I use white lithium a Assembly grease to pack the pump and they prime fast(auto mechanic tip). Do you think one of your hoses was pourous? Btw, I still need the linkAge parts. I'm down at my ranch most every weekend through the fall. Also need a set of bucket pins with grease zerts(drilled).

Sitting awaiting time to spread what we hauled from the bottom of the hill. This is for the new home site.



At the original pile a few days prior.

The pumps are finnicky they do not run off the flywheel but the converter drive plate accessed thru the four bolt plate atop the Converter. The splines on these wear and can appear as OK but be stripped enough to not function. As well ANY air entrainment and they will fail to pump forward. E&E Hydraulics of Union MO got me a replacement pump, shaft is NLA, Couplers are NLA. It is a Eaton base pump, can replace that with the same basic pump and change out the spline shaft and couplings just have to get them from a regular Hyd Shop and cut to fit. The most common are 9 and 13 spline systems, check locally for a Hyd Shop that will replace your pump shaft and then build the drive mechanism shafting.

I was lucky as had the second unit here for parts. Have used up all my own spares where this is how will have to approach the next repair.

To get the shaft out, pull the four bolt cover, pull the pump two bolt mounting. Then remove the adaptor head on the converter for the two bolt pump mount and CAREFULLY remove the shaft, do not drop it. Are three Bolts holding drive plate to the gearing, carefully remove those three bolts thru that access hole on the converter and remove the plate. Had to have a TIG welder weld a piece of good spline coupler into a Lathe cut drive flange to get ine usable. At this point ANY spline can be adapted.

Will dig thru my receipts and see if can find p/n

Yes Two suctions.



Forward suction draws off Trans sump strainer feeds that oil to the Left Clutch Housing side where actually feeds the Common Screen suction for the Steering Pump and the aft section of trans pump which then feeds the Trans filter to the Shift selector. Either strainer can be loaded and cause issues, Oil level Running needs to be AT or just ABOVE the indicated Full Mark when hot. Front section is No Pressure just scavenge, rear does the work.

but what is the aft stand for I know it is simple probably