How common is it for threads or glands to be destroyed when taking cylinders apart? I sent 2 clyinders off a wheel loader out to be rebuilt and the shop says the threads are damaged because they had a hard time getting the glands broke loose. Now the job is going to cost 2-3 times the original quote. Should the shop eat the cost or is this to be expected? The whole reason I outsourced this work is so that I wouldn't have this problem.
Since cylinders usually last 20 years or so before they need attention, it's not uncommon for the gland to be rusted up tight and not easy to get apart. If the threads seized as it was turned out, it will be obvious from looking at the damaged threads. You might have got them apart by peening, heating, soaking, etc. rather than taking the brute force approach, or they might have seized on you and you wouldn't have got them apart at all. What kind of loader? how old?
very common problem on threaded cylinders water gets in and rusts threads no other choice than to wind them out any way possible remember they only gave you a QUOTE no shop will ever eat the cost because you have a old rusty cylinder
What is it off of
It's off a 70's something Trojan 1900
Don't know the specifics of that one. But with the age and your location I would say it's very reasonable. John Deere loaders of that age do the same thing
Yep, Deere had those fine thread internal gland setups, anything over about ten years of service here in Oregon you were always in for a battle, there were a couple the threads came out with the gland as I recall. Never did any Trojan cylinders here either, but sadly it's just the nature of the beast on an older machine like that, if they were not assembled with anti-seize originally. Some designs the o-ring was at the top of the gland so the threads were in oil, but the ones with the o-ring at the wet end so the threads were dry, they corrode up and just about weld themselves together.
How much was the original quote? Which cylinders are you rebuilding? If you're working with the steering cylinders, what are we talking about, an extra $400-500?
I had the piston end of a JD loader lift ram that was all boogered up, had to strap wrench take it apart and then spent a couple hours with a thread file to get it all back looking spiffy from a hammer strike, it assembled with hand torque afterwards. I could see a shop not being interested in working out a thread file.
Is it an external thread (male) or internal thread (female) that's boogered up? or both?
In my case it was the male threads, as to the OP, I'm thinking that the chosen shop wasn't up for the task, same as my local pump shop turned out to be parts swappers when all that was needed was a bit of hand machining. $1900 pump replacement was actually $200 in parts and an hour on the surface plate to hand lap it all nice and snug.
I use a pipe cutter style thread repair tool, looks like an old pipe cutter, but has dies, that attach to the jaws, and once you have the size die , bolted on, makes fast work of cleaning up damaged male threads. On the female stuff, you're pretty much screwed, so to speak...