6610 pto slipping?

got around to checking pressure today, got the oil temp up and installed a gauge. i had to guess on rpm since tach is broke but should be real close to the recommended 850 rpm and with pto off gauge reads 30psi with it on drops to 25 psi. i also tried it around 16-1700rpm and got 60psi off and droped to 55psi with pto on. what does the manual say i should do now?

btw my neighbor said he has a manual but lives couple hrs away and could be awhile before he comes back down this way. so might need some more scans if you dont mind bern. and thanks again.

not sure why this posted to new topic instead of replying to my old post but if a mod sees this you can delete it. i have reposted it to my original post.

The 6600 spec is 140-155 at 1900 rpm and operating temp.

I gave you everything there was out of the manual that would be of any value. The only thing in the PTO section that I did not send you was
info related to the actual reduction gearing.

Based on your numbers, you either have an extremely worn out pump, or more likely (if this issue came about all of a sudden), the attaching
clip popped off of the pump inlet line at the control valve. The early units were kind of bad for that issue.

i didnt really notice in what you sent the specs for what it said pressure should be, i thought it said refer to a section that wasnt on there. ill have to look back thru them

says see specifications chapter 4 for the correct pressure ratings

yes it says chapter 4 for the specs but i dont have that available. also bern if its not much trouble could you look at a parts diagram on new holland site and tell me which part i should be looking for for the clip that may be off. thanks

Pressure spec is 160-180 PSI - that number was hand written in the copy I gave you.

As for the clip, it's not sold separately. It's part of tube #71 in the diagram below. If you zoom in and look carefully, you'll see the clip
on the tube just above the arrow where #71 points to. The clip normally sits near the top of the tube, not where it's shown in the diagram.
Tube & Clip Assy

ok so the pressure for both disengaged and engaged is 160-180? thats what i wasnt sure about because it says if disengaged is below spec to shim the valve out.

as for how long its been like this i dont know, thats the first time that i have put a load on the pto. the guy i bought it from said he has never had any trouble out of the pto while baling or bush hogging. i dont know the guy at all but my brother does realy well and he said he dont think he would lie about it. so im hoping it just happened sudden and its the clip that your talking about or something else real obvious when i take the lift cover off.

which brings me to the next question on some tractors i have worked on when taking lift cover off you have to remove a standpipe or something else before raising or after raising a couple of inches anything hidden on this tractor?

Yes, you want 160-180 in both positions. If you look at the theory of operation, you need this pressure in both directions, one for the
clutch, and the other for the brake.

There should be a short 2" or so standpipe between the cover and rear axle when you go to lift it off, but it usually does not give any
trouble - it'll go one way or the other when the cover moves up. Suggest replacing o-rings on that pipe before going back together.

Please let us know what you end up finding.

will do thanks again no just got to get time to mess with it maybe end of week.

I know I'm a little late into this conversation, but you can order a replacement clip, it is PN 9579866. It's a couple of bucks. When you get it, carefully examine it. I had to replace the original clips on both my 6610 and 7610. The 7610 went together fine, no problems, the 6610 popped the line another 3 times before I realized the new clip wasn't seating all the way because the little tongs you pinch together to seat it had gotten flattened out, preventing the wire from fully seating into the groove all the way around. A quick pinch with some pliars, and it hasn't come loose again. I know a few people have said the o-ring size listed in the manual is not correct, but I have not had any problem using the NH supplied o-ring. My 6610 actually did about stump me, as it sheared the splines on the gear inside the pump that drive the low pressure circuit (PTO, Dual Power, 4wd, and cooling/lube circuit). It was tricky because they would turn by hand fine unless I wiggled the gear around and turned it really quickly, I could feel them slip. Definitely check that out. If it is the problem, a new aftermarket pump is going to be the most economical route. Both of these issues would present themselves pretty suddenly. Do you have pressure to the remotes and 3pt lift?

Hurst

i have around 1700psi at the remotes and the 3 pt works fine. but it has the engine mounted pump that works the outlets.

for anyone that runs into the same problem i had, mine turned out to be a missing oring on the pickup tube on the pto valve that comes from the pump. it was completely gone and leaking like a sieve.

and a huge thanks to bern. he sent me scans of his manual that i needed to do the job and answered numerous emails. top notch guy.