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Topic: HWH pump leak (Read 671 times) previous topic - next topic

HWH pump leak

03 U320

Since I have owned this coach (2 years) I have had a slow fluid leak coming from the bottom of the motor side of pump assembly. 

Every  now and then I need to open the pump cylinders to purge air.

1) would I be correct to assume there is a seal between the motor and the pump ?

2) anyone have a part number for the seal or size used?

3) if I remove the motor to replace the seal do I need to drain the reservoir first to avoid dumping the fluid into the pan ?

Thanks!
2003 U320 40 AGDS Build 6157 161K miles

Hampstead NC

Re: HWH pump leak

Reply #1 –
I just joined this forum due to your question. I own a 2023 Coach House motorhome with a HWH slide and leveling system. I have the same questions as you. And had the same problem. But just today i tightened the 2 bolts attaching the motor to the pump and then ran the jack system. So far no leaks.

Re: HWH pump leak

Reply #2 –
That's the first thing I checked and they were very tight.

I'm trying to find someone who replaced the seals in the manifold.  Got to be someone on here that has had this leak. 
2003 U320 40 AGDS Build 6157 161K miles

Hampstead NC

Re: HWH pump leak

Reply #3 –
If you are going to change the seal on the shaft of the pump, then yes you would need to remove the fluid from the reservoir. 
previous 1984 35 ft ORED 250 HP 3208 Cat       
previous 1998 40 ft U295 CAI 325 hp Cummins
previous 2003 40 Ft u320 build #6140 450 Cummins M11.                                                         
1999 Mazda Miata
Ron, Nancy, Tipper the cat, Max The dog
1997 U 270 36 ft build number 5174 8.3 Cummins

Re: HWH pump leak

Reply #4 –
Thanks for reply. 

I have seen three posts that state you don't need to drain the reservoir when removing the motor (see pic) itself.

Looking closely at the shaft on the motor it would appear there must be a  seal on the male end of the pump shaft inside the manifold. So without having the assembly diagram it makes sense that replacing the pump seal would require the tank drain.

I can't find anything other than replacement o-rings on the HWH site.

Is it pretty straight forward tearing the manifold down and reassembling ? Any advice on this would be appreciated. 

Thx
2003 U320 40 AGDS Build 6157 161K miles

Hampstead NC

Re: HWH pump leak

Reply #5 –
I don't think that you need to disassemble the manifold. Once the motor is off you should be able to see the seal on the shaft. If it comes out from the outside you might be able to put a screw in it and pull out the seal. Then drive in a new seal.
previous 1984 35 ft ORED 250 HP 3208 Cat       
previous 1998 40 ft U295 CAI 325 hp Cummins
previous 2003 40 Ft u320 build #6140 450 Cummins M11.                                                         
1999 Mazda Miata
Ron, Nancy, Tipper the cat, Max The dog
1997 U 270 36 ft build number 5174 8.3 Cummins

Re: HWH pump leak

Reply #6 –
So I was just informed by HWH that they do not carry parts for the pump and that I need to replace the pump/motor/tank assembly.

I cannot wrap my head around this cause it's ridiculous.

Surely someone on this forum has had the same issue and was able to replace the seal.
2003 U320 40 AGDS Build 6157 161K miles

Hampstead NC

Re: HWH pump leak

Reply #7 –
Quote from: Charlieboise –
So I was just informed by HWH that they do not carry parts for the pump and that I need to replace the pump/motor/tank assembly.

I cannot wrap my head around this cause it's ridiculous.

Surely someone on this forum has had the same issue and was able to replace the seal.

You might try doing a post on IRV2 since that HWH pump was used in more then just Foretravel.  If you do find out, come back here and post your information, then we have it for future reference.

I think Dsd had his motor out when it stopped working and fixed the ground.  I think he had a thread on removing the motor so I know he did not get into the seals but it might help.
2014 ih45  (4th Foretravel owned)
 1997 36' U295 Sold in 2020, owned for 19 years
  U240 36' Sold to insurance company after melting in garage fire
    33' Foretravel on Dodge Chassis  Sold very long time ago

Re: HWH pump leak

Reply #8 –
Wow! I can't believe that. Some company built that pump/motor combo and there has to be a seal installed. Try calling a hydraulic company and let them know what your problem is.
Richard & Betty Bark & Keiko our Golden Doodle
2003 U320T 3820 PBDS
Build # 6215
MC # 16926
2016 Chevrolet Colorado 4X4 diesel

Re: HWH pump leak

Reply #9 –
Quote from: turbojack –
You might try doing a post on IRV2 since that HWH pump was used in more then just Foretravel.  If you do find out, come back here and post your information, then we have it for future reference.

And try to ping azpete (Paul Maddox) over there on iRV2.  He works for HWH and offers his phone number, for example in this recent post

Leaking Hydraulic Pump - iRV2 Forums

(ETA - edited to link a post with both Paul's number and his offer for service manual if you have the AP number of the pump)
Learn every day, but especially from the experiences of others. It's cheaper!  - John C. Bogle

2000 U320 36' non-slide / WildEBeest Rescue
2003 U320

Re: HWH pump leak

Reply #10 –
Quote from: turbojack –
You might try doing a post on IRV2 since that HWH pump was used in more then just Foretravel.  If you do find out, come back here and post your information, then we have it for future reference.

I think Dsd had his motor out when it stopped working and fixed the ground.  I think he had a thread on removing the motor so I know he did not get into the seals but it might help.
Slide pump electric motor part numbers

Personally I would see what the seal number is or remove and source the seal by the size. A good hydronic shop will help you order the correct seal

Re: HWH pump leak

Reply #11 –
See pic of the manifold.  The red stuff is grease that had liquefied and started running down the block.

I cleaned it up and realized it's not actually leaking.

Found a leak on one of the original black cylinders.  Pulled it out and found some metal particles on the screen. They appear to be parts of the screen. Screen looks good overall.

There are a total of 7 seals on the valve seat.  I'm now trying to source a kit. The one I'm finding on HWHs website does not contain the two flat seals that surround the screen.  I have an email into Pete to see if he can assist.


2003 U320 40 AGDS Build 6157 161K miles

Hampstead NC