New Holland Plunger Questions

Bill VA

Well-known Member
I have the plunger out of my NH68 and tried to take the knife off of it - got one bolt out, no go with the other ones. I've been soaking them every day for a week with PB blaster and with some heat, one of the bolts came out.

Any sage advice for getting these counter sunk bolts out before I do something drastic - LOL!

Also while the plunger is out I'm replacing the wood slides, the crank bearing - but there is a tad of play in the brass bushings that hold the plunger head to the drive arm. While I've got the plunger out, I'm thinking about replacing the brass bushings too. Any sage advice for that repair before I tear into it?

I think if I get this plunger rebuilt, no more than we will ever bale, this part of the baler ought to last a very long time.

Once I'm finished with the plunger, I'm going to refresh the drive shaft u-joints and carrier bearing. Might put on new hay dog springs too.

I'm glad we are doing this work as a winter project vs racing to get hay done.

Bill
 
Mine had like a 1/4 inch allen on the countersunk bolt. The only way to remove it was an allen drive on a 1/2 impact drive air wrench. Any other way was risking stripping it out. Sometimes an impact wrench seems the only way to remove stubborn bolts if heat is not available.
 
Use a heavy fIat faced punch(so you don't F up the aIIen hoIe in the boIt head) and a BFH and beat da boIts square on head a number of times.
 
When I replaced the bushings in the plunger arm, they were so worn that they would not press out. Used a sawsall to make a relief cut in the thickest portion of the bushing, careful to not go too far. They then pounded out easily. Wish I had a press at the time.

Not a bad job and the parts from NH were not that expensive. Do it now.

Which I had also done the wood rails....

John
 
Thanks!

Not so simple with the knife on a 68. There is no nut to torch off and get-on with it. There is a steel plate behind the knife and the counter sunk bolt threads into it. I wish there was a bolt and some access to it. Sometimes with a stubborn nut - if it's small enough thread diameter is over-tighten until the bolt shears, if that don't work, then yes - out comes the torch or grinding wheel.
 
Allen drive is what's next with an impact drive air wrench! If that don't work, then I'll weld nut to the outside of the bolt and give that a try.
 
Wax - I'm one step ahead of you on this one, been using wax for years. It's amazing how you can add heat and watch the wax get drawn into the crevice of the bolt as it cools.

Thanks,
Bill
 
Yea - I'm thinking that while I got this plunger out,
I may as well renew it completely.

Thanks,
Bill
 

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