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Old 10-06-2022, 08:41 AM   #1
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Hydraulic Pump Identification Help Needed

Hi Guys & Gals,

We have a 2002 Monaco Diplomat 38PST and the Hydraulic Pump seems to be leaking quite badly. We're thinking about replacing it, having this one rebuilt, and then keeping it as a spare.

But as you can see from the photos, there doesn't seem to be an identification tag on it...

Can anyone tell me what model # we have? (The image we have from Rev Group looks very different to ours.)

Thanks in advance!

Kind regards,

Scott
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Old 10-06-2022, 08:48 AM   #2
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Scott, the pictures didn't show.

Check out this thread from a few days ago.

https://www.irv2.com/forums/f115/hyd...mp-595135.html
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Old 10-06-2022, 12:22 PM   #3
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Hydraulic Pump Identification Help Needed

Sorry, here are the photos...
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Old 10-06-2022, 12:51 PM   #4
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Hydraulic Pump Identification Help Needed

Rev Group gives the part number as : 10108581

And the "Legacy part number" for it on their site is: 01805417

Price is $828.52

But there's no photo of it on their site, which makes me nervous...
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Old 10-06-2022, 02:30 PM   #5
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Hydraulic Pump Confusion

I found this photo of the pump that Rev Group says was installed on our coach.

So it seems the smaller part on the right is the hydraulic pump for the power steering.

So what is the part on the left? Is that a Cummins pump for the fan or something?

I'm so confused...
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Old 10-06-2022, 02:48 PM   #6
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Do you have a hydraulic fan?? I only thought they were used on side radiators but I'm not sure.



I think you are right on the pump from REV, it's probably just the steering circuit. This is piggy backed onto something else, this isn't your compressor is it?



So unless you can determine what other hydraulic I have no idea what it might be.
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Old 10-07-2022, 04:11 AM   #7
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Quote:
Originally Posted by jacwjames View Post
Do you have a hydraulic fan?? I only thought they were used on side radiators but I'm not sure.

I think you are right on the pump from REV, it's probably just the steering circuit. This is piggy backed onto something else, this isn't your compressor is it?

So unless you can determine what other hydraulic I have no idea what it might be.
Thank you Jim!

It could be the compressor. I will ask Cummins about thisÖ Is that something that could break down after 20 years?

Iím trying to do as much preventative maintenance on this rig as I can, so if you have any other tips, Iím all ears!

Iíve ordered new air springs, and I guess we will get the hydraulic hoses replaced as soon as we are able to find a company to do that since one just sprung a leak on us during our trip last weekÖ

Thanks again!

Scott
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Old 10-07-2022, 07:07 AM   #8
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Oil typically doesn't leak UP. Both of your pictures indicate a lot of oil above the compressor and pump.

I would pressure wash the engine and find where the oil is coming from.
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Old 10-07-2022, 05:26 PM   #9
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It is the compressor and Cummins compressor's are considered very reliable. It can be leaking as well though.
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Old 10-08-2022, 03:39 AM   #10
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Hydraulic Pump Idenfication

Thanks for the tips guys!

In the meantime after a real scavenger hunt around the internets, I found the pump.

Itís a LuK Fahrzeug-Hydraulik # LF73C or LH2112813

Luk Fahrzeug-Hydraulik GmbH & Co. KG
Zepplinstrasse 3*
61352*Bad Homburg**- Gonzenheim
Hessen
Germany
+49 - 6172 - 1220

Which now seems to be part of Schaeffler (www.schaeffler.de)

I purchased one from Northwest RV Supply in Oregon for $299.
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Old 10-12-2022, 11:19 AM   #11
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Scott,
I have a 2004 Monaco Sig and 10 miles east of Knoxville, TN on I 40 developed a hydraulic pump leak. After some extensive research the best alternative for us was to have it rebuilt and then pressure checked by Nashville Hydraulic for $100.
Roy
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Old 10-13-2022, 08:05 AM   #12
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Hydraulic Pump Identification Help Needed

Quote:
Originally Posted by softballnut View Post
Scott,
I have a 2004 Monaco Sig and 10 miles east of Knoxville, TN on I 40 developed a hydraulic pump leak. After some extensive research the best alternative for us was to have it rebuilt and then pressure checked by Nashville Hydraulic for $100.
Roy
That's super inexpensive! Congrats!

Do know which part of it was leaking?
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Old 10-13-2022, 09:05 AM   #13
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These pumps are pretty simple, There is the input shaft with shaft seals and then O-ring type seals that seal the parts that bolt together and possible other seals to separate the intake/output side of the pump. Shaft seals are prone to leaking.



I have a stacked pump setup, one steering pump and the pump for the hydraulic fan. REV lists the pump for ~3400 but you can buy the seal kit for ~$300, they have a pretty big markup so you could take it to a shop and have them rebuild it. A shop will measure the shaft diameter and diameter of the seal location and can cross reference the seals. In most cases they can match a seal.



I needed a packing set for piston on my log splitter, took it to the shop and they measured the old one and one in stock, even installed it for me, I think it was less then $30.
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Old 10-14-2022, 03:51 PM   #14
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Quote:
Originally Posted by jacwjames View Post
These pumps are pretty simple, There is the input shaft with shaft seals and then O-ring type seals that seal the parts that bolt together and possible other seals to separate the intake/output side of the pump. Shaft seals are prone to leaking.



I have a stacked pump setup, one steering pump and the pump for the hydraulic fan. REV lists the pump for ~3400 but you can buy the seal kit for ~$300, they have a pretty big markup so you could take it to a shop and have them rebuild it. A shop will measure the shaft diameter and diameter of the seal location and can cross reference the seals. In most cases they can match a seal.



I needed a packing set for piston on my log splitter, took it to the shop and they measured the old one and one in stock, even installed it for me, I think it was less then $30.
If you have the style pump that bolts to the compressor they are 550 at Whitehouse. Seal kits are 125. I got one this summer.
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