Hi,New member here, with a log loader problem.

[badgascoupe]

Hi,Well found this sight while looking to solve a hyd problem with a log loader. I have a Prentice extendaboom loader,originally a sheetrock loader.Put the loader on a 3 axle Mack. I took off the rock forks and added a grapple. Here's the problem,all the loader functions operate off their seperate spools on the valve body,however the grapple dosen't have enough pressure to hold the log.I had the grapple cyls repacked still same issue.Any ideas? Thanks,Sean

 

[DT86]

Repost in Hydraulics, someone will bite.

 

[Walt 2002]

Welcome,

Walt Conner

 

[KWentling]

Would it be possible to put bigger cylinders on it? I guess you might want to check the pressure output to make sure the pump is putting out what it should and a relief valve isn't bypassing too soon.

Kim

 

[badgascoupe]

Thanks,will do.

 

[badgascoupe]

Hi Kim,The grapple cyls have 4" barrels,actually a little bigger then my past 2 loaders.I'm thinking the valve body has an issue as the spool with the grapple on it will creep closed if you let off the handle.I moved those lines to the rotator spool and the grapple does not creep at all.All other functions on the valve bank operate correctly.

 

[KWentling]

Hi Kim,The grapple cyls have 4" barrels,actually a little bigger then my past 2 loaders.I'm thinking the valve body has an issue as the spool with the grapple on it will creep closed if you let off the handle.I moved those lines to the rotator spool and the grapple does not creep at all.All other functions on the valve bank operate correctly.

Sounds like you have found the problem.

Kim