Author Topic: Hydraulic pump leak  (Read 35 times)

Don Forsyth

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Hydraulic pump leak
« on: April 18, 2024, 10:39:59 PM »
I have a 2005 Beaver Monterey Laguna IV w/Cat C9  400. I noticed the other day a puddle under the rear just about the battery location. I crawled under to find that the large hydraulic line that connects to the pump had loosened and was dripping. I lost about a gal of fluid. Which makes sense because my power steering started groaning. Originally the elbow of the line was horizontal and up near the frame and tucked away. When I found it, it was hanging down vertically. I pushed it back up as tight as I could by hand and then put a pipe wrench on the fitting. I thought that fixed it until a few days later when I noticed a new spot on the ground. The fitting is still leaking. I can't tighten it anymore and was wondering it maybe the nut turns on the front of the pump. So not wanting to create more problems I thought I would reach out and see if anyone was familiar with this and how to tighten it. Having trouble attaching picture.
2005 Monterey
CAT C9 400hp

Frank Bergamo

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Re: Hydraulic pump leak
« Reply #1 on: April 18, 2024, 11:19:20 PM »
The fitting that goes into the pump housing is a O-ring fitting. Rotate the elbow fitting where it lines up with the hose fitting then snug it down. That should fix the drip. If not, then back out the nut to access the O-ring and replace O-ring and reassemble. Hope this helps.
Frank & Paulette Bergamo
2019-       : 2007 Marquis Topaz IV  C-15 600 HP Allison 4000
2014-2019: 2002 Marquis Emerald C-12 505 HP Allison 4000
2004-2014: 1986 Executive Diplomat 3208 250 HP Allison MT-643
Grand Junction, CO.