Construction and other equipment - DIPPERSTICK CYLINDER FOR 615 KEEPS BLOWING TOP OFF

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DIPPERSTICK CYLINDER FOR 615 KEEPS BLOWING TOP OFF

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=139129
Printed Date: 06 Aug 2025 at 5:02am
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Topic: DIPPERSTICK CYLINDER FOR 615 KEEPS BLOWING TOP OFF

Posted By: Dezeldog
Subject: DIPPERSTICK CYLINDER FOR 615 KEEPS BLOWING TOP OFF
Date Posted: 06 Jun 2017 at 11:00am

HELLO ALL,

I HAVE A 615 BACKHOE THAT STARTED BLOWING THE TOP OFF THE DIPPERSTICK CYLINDER, I IMAGINE THE THREADS ON THE INSIDE OF THE CAP HAVE GOTTEN PRETTY THIN AFTER THE 4TH TIME IN A WEEK. ANYBODY HAVE A SUGGESTION FOR A REPAIR, OR DOES ANYBODY HAVE AN OLD 615 THEY ARE PARTING OUT?

ANY HELP IS APPRECIATED, THANK YOU.

Replies:

Posted By: Dozer
Date Posted: 06 Jun 2017 at 4:56pm

You will likely need to replace the cylinder. For a good repair take the complete cylinder to a hydraulic repair shop. I have had cylinders rebuilt for about $700 If you are trying to get by put it back together and tack weld it knowing that when anything else happens your cylinder is junk.

Posted By: DiyDave
Date Posted: 06 Jun 2017 at 6:30pm

Also check the system relief valve, to make sure it isn't stuck shut...

Posted By: Coke-in-MN
Date Posted: 07 Jun 2017 at 9:20am

The cast ring that holds the gland has worn along with the threads on the steel barrel . For a quick repair to finish a job - I ground about 1/4" off the barrel this allowed the cast ring to grab new threads - Still working and further repair not needed yet.

My next fix was going to be a plate over the ring with hole for shaft - then threaded rod back to clamp around barrel - kind of like tire rods .

As that outside ring only retains the packing gland and seals it does not function to do anything but hold that gland - A couple spot welds of say 1/4 bead a couple places can help also if rest of areas are good .

The cylinders used on AC 715 hoe are the same size and lengths but the 715 uses a smaller rod diameter on those cylinders . In fact i have one cylinder from my 615 on the 715 now

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"Challenges are what make life interesting; overcoming them is what makes life meaningful."

Posted By: LeonR2013
Date Posted: 10 Jun 2017 at 12:00am

Coke I had the same problem as you with the cylinder so I capped it and welded a piece of small pipe to the barrel and drilled and tapped the plate over the end. If it starts weeping just snug the bolts a little. When I welded the small pipes to the barrel it did shrink the barrel a bit at the weld so had to work that out.