Hi guys,
I've been a lurker for a while and you've helped me on a bunch of projects, but I've come across a problem I can't solve with the search function. On the bright side, it got me to finally sign up!
So here's what I've got, I'm hoping it's actually a common issue to you hydraulic gurus...
1985 JCB 1550 3C serial # 308711
2wd with Wain Roy twist-a-wrist clamshell hoe
Backhoe always seemed weaker then it should be, but I don't have a lot of experience and I could get the job done eventually. Loader always seemed fine.
I finally got a gauge hooked up at the loader valve test port. It has a 2 stage main relief valve to separate loader (2600psi) and backhoe (3000psi)
I can't get the backhoe over 2000psi even after adjusting the relief all the way to the stop. It will adjust pressure down to zero if I go the other way.
The loader adjusts to 2600 easily and can get over 3000 if I wanted, so I don't think it's the pump.
I pulled the relief valve apart and cleaned it. No obvious worn out bits. Changed the o-rings as much as possible (didn't have one tiny one).
No change in numbers.
The high pressure sensing line seems to have flow as the port leaks when the line is removed. I don't have specs or fittings to test that currently.
So, sorry for the book. I hope there's something obvious I'm overlooking. I really appreciate any help
I've been a lurker for a while and you've helped me on a bunch of projects, but I've come across a problem I can't solve with the search function. On the bright side, it got me to finally sign up!
So here's what I've got, I'm hoping it's actually a common issue to you hydraulic gurus...
1985 JCB 1550 3C serial # 308711
2wd with Wain Roy twist-a-wrist clamshell hoe
Backhoe always seemed weaker then it should be, but I don't have a lot of experience and I could get the job done eventually. Loader always seemed fine.
I finally got a gauge hooked up at the loader valve test port. It has a 2 stage main relief valve to separate loader (2600psi) and backhoe (3000psi)
I can't get the backhoe over 2000psi even after adjusting the relief all the way to the stop. It will adjust pressure down to zero if I go the other way.
The loader adjusts to 2600 easily and can get over 3000 if I wanted, so I don't think it's the pump.
I pulled the relief valve apart and cleaned it. No obvious worn out bits. Changed the o-rings as much as possible (didn't have one tiny one).
No change in numbers.
The high pressure sensing line seems to have flow as the port leaks when the line is removed. I don't have specs or fittings to test that currently.
So, sorry for the book. I hope there's something obvious I'm overlooking. I really appreciate any help