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Old 10-01-2017, 09:48 AM   #1
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HWH Hydraulic System Fluid Now Suspect

Greetings O' Wise Ones...
Replaced a blown slide servo hydraulic hose on our 2012 Tiffin Class A Allegro (Ford F53 frame, V10) with a new hose. There was about a pint and a half of fluid loss, new hose tested OK, and the HWH 625 system still functions ( sweet, thanking my lucky stars) after the replacement was installed.

OK, that's the back story. The rub for me is the loss of fluid. The reservoir fluid remaining isn't clear (as new HWH specialty hydraulic fluid might appear) isn't red (as dyed Dextron Automatic Trans Fluid might appear), but is the typical drab olive green color of new oil. Hmmmm. What the heck ?! I have called HWH with the below questions, waiting on a reply now for a week. So much for their product support.

I can find no record from the previous owner (who is now infirm and sadly without good memory) of hydraulic system service. The oil seems a bit heavier than the watery consistency of ATF fluid. The oil in the reservoir reminds me of about a five or ten weight multipurpose oil.

1. Can anyone ID this as perhaps a heavy duty hydraulic oil, or typical of aged hydraulic fluid, etc.

2. Is it beyond the ability of the model 625 HWH system to continue to run heavier oil ? .. We've operated with same fluid without a problem for about a six month period of weekly use.

3. Is it permissible to mix viscosity or type ? My instinct says NO . Shall I then have to pump out the remainder, flush, recharge and bleed the system, and then run a synchronization of the two servos.. (this would be beyond my driveway mech ability I think.)

4. As the slide system and jacks are operating normally with the given volume,
(about half of the reservoir remains with slide and jacks out ) is it critical to do anything at all, or is that just waiting for a certain pending hydraulic failure?

Am I overthinking this?
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Old 10-01-2017, 11:35 AM   #2
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the hwh system runs at 3200 lbs, plus or minus. the hwh fluid is a light bronze color, or close to clear, to me.
at this pressure, if it was 5 or 20 wt oil, it would function. i dont know about compatibility with the seals.
if you are in doubt, siphon it out, and flush the system with new fluid a couple of times. if it has been functioning for several months, the seals probably aren't damaged.
if you bought it from a dealership, why not ask them to contact the former owner and ask them if they added any other fluid to the system. just a chance they have never touched it. if you need help, call me at 602-549-3638. i can help
paul maddox hwh rep.
i do work for hwh corp. i help with diagnostics. i do not sell parts or solicit service work on this forum.
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Old 10-01-2017, 11:41 AM   #3
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Paul is good, thanks for past support!
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Old 10-01-2017, 11:45 AM   #4
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Quote:
Originally Posted by rotorhead173 View Post
Greetings O' Wise Ones...
Replaced a blown slide servo hydraulic hose on our 2012 Tiffin Class A Allegro (Ford F53 frame, V10) with a new hose. There was about a pint and a half of fluid loss, new hose tested OK, and the HWH 625 system still functions ( sweet, thanking my lucky stars) after the replacement was installed.

OK, that's the back story. The rub for me is the loss of fluid. The reservoir fluid remaining isn't clear (as new HWH specialty hydraulic fluid might appear) isn't red (as dyed Dextron Automatic Trans Fluid might appear), but is the typical drab olive green color of new oil. Hmmmm. What the heck ?! I have called HWH with the below questions, waiting on a reply now for a week. So much for their product support.

I can find no record from the previous owner (who is now infirm and sadly without good memory) of hydraulic system service. The oil seems a bit heavier than the watery consistency of ATF fluid. The oil in the reservoir reminds me of about a five or ten weight multipurpose oil.

1. Can anyone ID this as perhaps a heavy duty hydraulic oil, or typical of aged hydraulic fluid, etc.

2. Is it beyond the ability of the model 625 HWH system to continue to run heavier oil ? .. We've operated with same fluid without a problem for about a six month period of weekly use.

3. Is it permissible to mix viscosity or type ? My instinct says NO . Shall I then have to pump out the remainder, flush, recharge and bleed the system, and then run a synchronization of the two servos.. (this would be beyond my driveway mech ability I think.)

4. As the slide system and jacks are operating normally with the given volume,
(about half of the reservoir remains with slide and jacks out ) is it critical to do anything at all, or is that just waiting for a certain pending hydraulic failure?

Am I overthinking this?
Quote:
Originally Posted by azpete View Post
the hwh system runs at 3200 lbs, plus or minus. the hwh fluid is a light bronze color, or close to clear, to me.
at this pressure, if it was 5 or 20 wt oil, it would function. i dont know about compatibility with the seals.
if you are in doubt, siphon it out, and flush the system with new fluid a couple of times. if it has been functioning for several months, the seals probably aren't damaged.
if you bought it from a dealership, why not ask them to contact the former owner and ask them if they added any other fluid to the system. just a chance they have never touched it. if you need help, call me at 602-549-3638. i can help
paul maddox hwh rep.
i do work for hwh corp. i help with diagnostics. i do not sell parts or solicit service work on this forum.
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Old 10-01-2017, 02:32 PM   #5
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Thanks Paul, I'll be in touch !
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