• ArboristSite has decided that due to the abusive interactions users are having with each other in the political forum, we will no longer be providing a place to talk politics on this forum. Any political posts will be deleted once discovered or reported to us. We are sorry for this inconvenience.

ArboristSite.com Sponsors
www.harvesterbars.com


Log splitter hydraulic leak

92utownxh

92utownxh

ArboristSite Operative
Joined
Sep 9, 2009
Messages
246
Location
Unionville, Indiana
Good afternoon, yesterday when I was splitting I noticed a steady drip of hydraulic fluid leaking. It's a DHT 22 ton. The leak is at the threaded connection between the control valve and the cylinder. It's on the control side.

I've never messed with hydraulics before. First, is there pressure in the system when not running? Second, how do I fix the leak? It looks like if I just tighten the control side the cylinder side will loosen. So, do I need to disconnect all the hose fittings to tighten this one? Clean the threads, tape, and spin the control valve back on? Then, do just use teflon tape on the threads?

That's how it looks, but I was hoping there would be a quick and easy way without disconnecting all the hoses.
Thanks! 20200322_201355.jpg
 
JeffHK454

JeffHK454

Addicted to ArboristSite
Joined
Oct 16, 2005
Messages
1,643
Age
51
Location
Cincinnati
I had that same little nipple between the cylinder and the valve get cracked do to fatigue..it’s not hard but you will have to remove the lines and valve. Only use hyd. fittings also.
 
NIP Group
92utownxh

92utownxh

ArboristSite Operative
Joined
Sep 9, 2009
Messages
246
Location
Unionville, Indiana
Thanks, I'll probably just pick up a new nipple at Napa in case that one is cracked. It's split a lot of wood and that's the first issue. I quit when I noticed it leaking. I hate how I have to take all the other hoses off to get to this one.
 
kevin j

kevin j

Addicted to ArboristSite
Joined
Jan 14, 2008
Messages
2,318
Location
Minnesota
the hex nipple for hydraulic fittings is NPT and you have to take it all off as others noted.
I would move it and make a bracket that U bolts around the cylinder with a truck muffler clamp, and a short hose. That way if a piece of wood hits it won’t break it off.

For new parts, you could use a male pipe x NPSM which is pipe thread with a taper on the ID of the pipe. The second fitting is a pipe swivel, with male NPT on one end, and female NPSM swivel with the inner fixed cone. The inner cone seals into the ID of the taper on the male NPSM. Woks much like the European 24 degree cone fittings (not interchange though) At least that way you would have adjustment and tighten it up properly. I hate NPT, always 1/8 turn loose, but +7/8 turn is too much and splits things......
 
Ash_403

Ash_403

Shop smart. Shop S-Mart.
Joined
Nov 5, 2010
Messages
290
Location
S central Indiana
I had my DHT 22 ton splitter for about one month, before I made a bracket that bolts to the control valve and clamps to the cylinder. Not surprised of the issue you are having. DHT (among others) using that threaded fitting as both a hydraulic line, and valve mount, is bad design.
 
nathan4104

nathan4104

ArboristSite Member
Joined
Dec 9, 2019
Messages
53
Age
40
Location
NW Ontario
it sucks to have to dissemble so much for one repair.......i just put my wood processor back together, short test run only to find one hose was leaking..... of course it's the one buried inside, so..... 4 hours later its changed. sucks to take back apart after reassembly but way easier than fixing out somewhere 1/2 way through a job!
i use a dab of thread sealer on my NPT fittings, likely not required but peace of mind.
 

Attachments

JeffHK454

JeffHK454

Addicted to ArboristSite
Joined
Oct 16, 2005
Messages
1,643
Age
51
Location
Cincinnati
it sucks to have to dissemble so much for one repair.......i just put my wood processor back together, short test run only to find one hose was leaking..... of course it's the one buried inside, so..... 4 hours later its changed. sucks to take back apart after reassembly but way easier than fixing out somewhere 1/2 way through a job!
i use a dab of thread sealer on my NPT fittings, likely not required but peace of mind.
You where correct to use a dab of pipe dope on NPT fittings as long as it has PTFE in it...just don’t use sealant on JIC type flare fittings .
 
Top