M720 pump replacement or rebuild

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asajay

New member
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Location
Spokane, WA
I obtained an M720 at auction a couple years ago and it sat idle until today when I wanted to hook it up to an S280 shelter I have. However, I found both hydraulic pumps to be non-operational, so I didn't dare lower it to the ground to start with. Both pumps move easily without ever building any pressure (yes, the pump valve is in the Pump position). My knee-jerk reaction is that the seals are probably bad.

Question:
What is consensus on the best way to fix this? Can the pumps be rebuilt? Are there suitable replacements available?

Thank you,
Asa Jay
 

gimpyrobb

dumpsterlandingfromorbit!
Steel Soldiers Supporter
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The pumps if memory serves are parker something-50 pumps. Should be rebuild-able.
 

asajay

New member
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1
Location
Spokane, WA
So a kit like this might help?:
M720 pump rebuild kit.png

Do you have any experience rebuilding these? If so, how easy would you say it is? I've done plenty of mechanical rebuilds, so I feel this falls in my wheelhouse; just looking for any "gotchas." :)
Thank you,
Asa Jay
 

asajay

New member
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Location
Spokane, WA
I ordered up a couple of kits. I've got next week off work and this looks like a good project for a day or two. :) I'll try to post my rebuild here.
Asa Jay
 

Coug

Active member
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Location
Olympia/WA
Most hydraulic pumps I've ever worked on were very simple. There really isn't a whole lot to most of them, so hopefully these are the same.
Good luck, take your time, and pay attention to what direction the seals are facing when you take it apart.
 

asajay

New member
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0
1
Location
Spokane, WA
I'm finally getting to the teardown of the first pump. I have it all apart at this point. Next job is to try and remove three coats of CARC from the housing, two of which are flaking off badly. I'm not sure if I should sandblast or use heat and a scraper. Any recommendations?

I had an evil though of taking the housing down and have it anodized or ceramic coated, instead of just trying to paint it.
Any thoughts about that?

I'm taking lots of photos, and a few notes. I'll be posting more hopefully in the next week as I find time to continue.
Asa Jay
 
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