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09-09-2020, 08:29 PM
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#1
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Junior Member
Tiffin Owners Club Freightliner Owners Club
Join Date: May 2020
Location: Holmes County, Ohio
Posts: 15
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HWH front jacks slam down on retract
Hi all. Working on first MH purchase. 98 Tiffin Allegro Bus 35 ft, 5.9, 6spd, one slide, 50k mi, Silver Anniversary. Well maintained. Runs excellent.
Bought from widow and unit not driven for 1.5 yrs. She did not know how to operate leveling jacks nor did I until after purchase.
The problem: front jacks let coach slam to ground upon selecting auto retract or manually. Rear jacks retract in a controlled manner. All jacks extend and level coach without issue. No sticking etc.
I understand front jacks retract at a little faster rate, supposedly, than the rears from what I've been told. Stuarts did not give plausible answer when contacted by email.
HWH 610 Series. Seems the fronts should retract under a more controlled rate. Visited neighbor who has 2000 HR with the HWH system and the fronts retract as they should and not letting coach drop immediately.
HWH is still six weeks out for return call from their Tech Dept.
Anyone else have this issue? Not sure where to start. Solenoid? Pressure switch? Oil level is good etc.
Any help appreciated or link to forum discussion would be great. Thank you in advance for your time!
Keith in NE Ohio
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Keith
cockshuttdecals.com
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09-09-2020, 08:37 PM
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#2
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Senior Member
Newmar Owners Club Tiffin Owners Club Workhorse Chassis Owner
Join Date: Jan 2015
Location: Byhalia, MS
Posts: 3,367
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Sounds like normal operation to me. Mine operates in a similar manner. When you select store or a down arrow, solenoids open and the weight of the coach drops. It is not metered for a soft movement. It just drops. Once the coach is back down the springs pull the jack rams back up (hopefully).
jt
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2019 Tiffin Phaeton 40IH
2005 Newmar Kountry Star Gas (Sold)
2022 JL Wrangler 4xe or 2017 Harley Ultra in tow
JT, Em & the boys, Kong & Baxter (rescued grey tabbies)
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09-09-2020, 08:41 PM
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#3
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Community Administrator
Tiffin Owners Club
Join Date: Sep 2013
Location: DFW, Texas
Posts: 21,266
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Both of our DPs are/were the same. If the front is lifted high there is a pretty sudden drop when the jacks are released.
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2017 Phaeton 40IH XSH Maroon Coral - Power Glide Chassis with IFS
Previous '15 Tiffin Allegro RED 38QRA and '06 Itasca Sunrise 35A
'16 Jeep JKU Wrangler Sahara or '08 Honda Goldwing
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09-09-2020, 08:42 PM
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#4
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Senior Member
Join Date: Jul 2000
Location: Chicago Metro
Posts: 3,957
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two things spring to mind...no pun intended.
- are the front jack springs intact, missing, worn?
- check hydraulic fluid level when jacks are down and room is out.
and front hacks retracting faster than rears is something i've never heard of.
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Rich, Ham Radio, Sport Pilot
Retired 9-1-1 Admin.
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09-09-2020, 08:52 PM
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#5
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Senior Member
Join Date: Dec 2016
Location: So Cal
Posts: 1,369
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If you have questions this HWH service center may have a quicker response time:
HWH Replacement Parts - Stuart's Services
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2000 42' BEAVER MARQUIS AMETHYST w/tag 2 SLIDES CAT C12 425 hp SOLD.........
2014 Tiffin Allegro Bus 37AP
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09-09-2020, 09:27 PM
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#6
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Junior Member
Tiffin Owners Club Freightliner Owners Club
Join Date: May 2020
Location: Holmes County, Ohio
Posts: 15
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Oil levels are good with everything extended. Springs are intact and good shape. Coach has never seen road salt and alas, no resulting corrosion. Read where some models of HWH had some kind of extra valve for the jacks. Sure seems something is amiss here. Need to keep researching. Thx
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Keith
cockshuttdecals.com
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09-10-2020, 01:57 AM
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#7
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Senior Member
Newmar Owners Club
Join Date: Jul 2011
Posts: 3,458
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ChopRod, reach out to AZPETE on here. He worked for HWH and has a wealth of knowledge and will help you out.
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2021 DSDP 4326 Freightliner
2023 Winnebago ERA 70A
2005 KSDP 3910 Spartan
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09-10-2020, 05:04 AM
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#8
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Senior Member
Monaco Owners Club Vintage RV Owners Club Holiday Rambler Owners Club
Join Date: Jul 2012
Location: Lexington, SC
Posts: 2,810
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Contact Paul at AZPETE on the Irv2 forum. He works for HWH and can answer your questions. His email is pfmaddox@att.net and his phone number is 602-549-3638. He is a Commercial Member and has posted that his phone is always on, and if not answered, leave a message.
He has helped others on this forum and I am sure he can help you.
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Vera & Ken
1998 Holiday Rambler Imperial, RR8S Chassis
Cummins 6C8.3 mechanical engine, 325HP, 3060 Allison
Towing 2014 Ford Explorer
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09-10-2020, 05:25 AM
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#9
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Senior Member
Join Date: Nov 2006
Location: Western NY
Posts: 6,142
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I think both react similarly in that how much extension and MH weight is being supported will affect the initial drop once solenoids open. When seated up front you will notice it more than rear. Mine have always had an initial sudden drop when retracting and how much is dependant on how much the MH has been lifted to level.
The rears have more tubing distance and likely more resistance to flow some some damping action but I don't think its increased intentionally via orifices, etc.
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Don & Marge
'13 Newmar Ventana 3433 - '14 CR-V TOAD
'03 Winnebago Adventurer 31Y - SOLD
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09-10-2020, 05:39 AM
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#10
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Senior Member
Join Date: Sep 2018
Posts: 1,944
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You could always put an in-line flow restriction on those two cylinders. There are different types, from a simple fitting with a small hole to choke down the flow, to a variable flow control with bypass check to allow no restriction while extending, but adjustable restriction while retracting.
https://www.farmandfleet.com/product...t%3EHydraulics
https://ph.parker.com/us/en/in-line-...series/9f400ss
Just a couple of random links for illustration purposes. I have no idea what size and type the connections are, though I'm sure they're pretty small.
Personally, I'd go with a cheap, fixed orifice inline fitting. Since the flow resistance varies roughly as the square of the fluid speed, if you use the right size, you'll soften the coach drop a bit without unduly restricting the normally slower flow from spring force alone, which will be much slower anyway. If it's too slow, it can be drilled out a little. And a little larger can make a big difference, so you have to sneak up on it.
Or just leave it alone, if it's normal. A quick perusal of some of HWH's schematics show no restriction of any kind in the cylinder circuits. So I guess it's normal.
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Tom & Jeri
2018 Coachmen Galleria 24T Li3
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09-10-2020, 05:58 AM
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#11
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Senior Member
Join Date: Nov 2005
Posts: 7,396
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Interesting--lets see what AZPete says...funny that only one of the two front jacks seems to be doing this rapid store....
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Old Scout
2015 IH45 Foretravel
2003 Alpine 40' MDTS [Sold]
New Braunfels, Texas
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09-10-2020, 12:09 PM
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#12
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Senior Member
Join Date: Sep 2016
Location: Sarasota, FL
Posts: 5,228
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The way your coach is acting is normal. I asked Azpete about it when he helped me with my system and he said you can either get used to it or you can install Velocity valves on each line back to the reservoir.
One source of the valves is HWH but you're experiencing the delays or you can call Chuck at Stuarts services HWH Replacement Parts - Stuart's Services. Chuck is very knowledgeable and can help you with all HWH questions and parts. I didn't install velocity valves. I bought everything I needed from him. Great guy.
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Rick and Larrie Dee
1997 40' Newmar London Aire DP CTA 8.3 (Mechanical) 325 Spartan MM
Bringing her back to her glory.
'08 Jeep GC Overland.
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09-10-2020, 12:10 PM
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#13
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Senior Member
Join Date: Jan 2011
Location: Wandering below the Gnat Line
Posts: 1,995
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Mine drops right smartly but there's no slamming, no bounce on the springs etc.
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-jbh-
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09-10-2020, 12:37 PM
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#14
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Senior Member
Join Date: Nov 2005
Posts: 7,396
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...so the more you extend your jacks to "level" your rig, the more they will drop/slam the rig when you store them …..best reason I have heard yet to seek level sites or block your tires, rather than raise the tires off ground...sorry, couldn't resist....
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Old Scout
2015 IH45 Foretravel
2003 Alpine 40' MDTS [Sold]
New Braunfels, Texas
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