MF 135 Hydraulic Leak?

   / MF 135 Hydraulic Leak? #1  

slhilbert

Bronze Member
Joined
Aug 21, 2013
Messages
75
Location
Noblesville IN
Tractor
Massey Ferguson 135
I have an MF 135 Gas, 1972 that I purchased this Spring. I don't notice the hydraulics having an issue when bush hogging or using the grader blade. However, when I park the tractor if I have the equipment up, then when I come back it will be down. I don't see any visible leaks that would indicate it is losing hydraulic fluid, however, I am new to hydraulics and tractors in general so maybe I am missing something. Shouldn't the implement stay in position even when the tractor is shut off? Where do I start in my troubleshooting?

Thanks,
Stuart
 
   / MF 135 Hydraulic Leak? #2  
Leak down is common on those. When you start the machine it should go right back where it was.
 
   / MF 135 Hydraulic Leak?
  • Thread Starter
#3  
Leak down is common on those. When you start the machine it should go right back where it was.

That is exactly what happens, so my questions are

  1. Why does this happen?
  2. Should I be concerned?
  3. How do I fix?

Thanks,
Stuart
 
   / MF 135 Hydraulic Leak? #4  
That is exactly what happens, so my questions are

  1. Why does this happen?
  2. Should I be concerned?
  3. How do I fix?

Thanks,
Stuart

How long does it take to leak down?
 
   / MF 135 Hydraulic Leak? #5  
if it doesn't leak down fast.. no need to fix.

IE. with a load.. if it holds up for 5m without leaking down.. I'd live with it.

Why does it happen. internal leaks at the hyd piston seal usually...though there are other places a leak could be. relief.. check valve.. etc.

concerned? If it leaks down fast.. then yes.. it's a concern and should be fixed. Slow? not so much. Most will leak down given time. ... ps it's an internal leak not external.
 
   / MF 135 Hydraulic Leak? #6  
That's how it should work as the lift cover piston has cast iron rings, the gaps leak oil in normal use. They were like that since new.
 
   / MF 135 Hydraulic Leak? #7  
I wonder if someone has engineered an aftermarket solution?
 
   / MF 135 Hydraulic Leak? #8  
   / MF 135 Hydraulic Leak? #9  
I wonder if someone has engineered an aftermarket solution?

an aftermarket soloution for a correctly working antique?

I've seen pistons that use orings.. .. but other than that. the internal cyl/piston is a tried and true design for 3pt lift.
 
   / MF 135 Hydraulic Leak?
  • Thread Starter
#10  
What I am hearing is "Don't worry about it". ;)

I wanted to check though just didn't want it leaking into something else and causing a problem there, but it sounds like there isn't anything to really worry about so that is good.

Thanks!
Stuart
 

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