I need to replace one jack. It's bent just enough that it's pulling a lot of current, and sometime blows the fuse for the right side. The jack works great with a hand crank but I want all 4 to work with the remote.Currently have Happijac 4500's, rated at 1900#. They are ball screw jacks and handle the weight ok.Yes, I know everyone calls them "Crappyjacs", but I'm not going to the expense of replacing all of them at one time. I want to wait till they need to be replaced and then add the heavier jacks.The 4800's are rated at 2800# but are ACME screw.I talked to Happijac. They said they are swappable, just a bit longer and heavier. They claim they are better even though they aren't ball screw. I would love to feel of them to make a hands on decision but there are no dealers near. Would like to know if the ACME screw mechanism handles the weight as well as the ball screw.I know the 4500's work better than the 4150s.Has anyone had the opportunity to compare these two or have them on your camper?If so, what camper are you lifting with them?

with crappy jacks long long long of history of knowing they had poor quality issues and" knowingly "continue to produce and sell a substandard product ,why would anyone trust their statements about improvements . this is a company that for years did little or next Nothing to help the people stuck with their junk ,yes you could send them back for possible repair but only at an very high cost to the customer . In the past I personally have had to replace 6 of their jacks and right now have at least 3 that should be replaced Torklift could teach them plenty about quality and customer relationsacme verses ball info link

After reading the info in 54suds link, I think that I would personally stay with the ball screw for the mere reason that I could drop the jacks to the ground without power. The acme sounds like it needs power to do anything to overcome friction.

after several hrs reviewing info on old and the new happi jacks it is my opinion they reduced parts costs ,reduced their production costs and then used "New" as an doubt-able!!!! EXCUSE to raise prices relative experience: 4 years machine shop 4 years machinist mate Navy , 1 year production quality control inspector in metal fab at Bossert Mfg Utica ,ny 1 year machine op at Chicago pneumatic , 26 years supervisor of both metal fabrication and soap mfg industries , then 6 more years shop supervisor metal furniture products & fabrication in another factory site

54suds wrote:with crappy jacks long long long of history of knowing they had poor quality issues and" knowingly "continue to produce and sell a substandard product ,why would anyone trust their statements about improvements . this is a company that for years did little or next Nothing to help the people stuck with their junk ,yes you could send them back for possible repair but only at an very high cost to the customer . In the past I personally have had to replace 6 of their jacks and right now have at least 3 that should be replaced Torklift could teach them plenty about quality and customer relationsacme verses ball info link16 years on my Hjac's. I use them a lot. Camper has close to 200,000 miles on it now. Just grease 2 times... Do have some rust on the outer shells. Rocks do create pits... Sand and paint soon.Jim

consider your self very lucky this is my first run in with hj all four were just like this ( have many more pix ) less than 1 year old hj denied any responsibility however Mark Holmes at Bigfoot stepped up and had them replaced when I showed them to him at the factory

Anyone using Happijac 4800 jacks? | Good Sam Community

54suds
Explorer
Sep 10, 2015
with crappy jacks long long long of history of knowing they had poor quality issues and" knowingly "continue to produce and sell a substandard product ,why would anyone trust their statements about improvements . this is a company that for years did little or next Nothing to help the people stuck with their junk ,yes you could send them back for possible repair but only at an very high cost to the customer . In the past I personally have had to replace 6 of their jacks and right now have at least 3 that should be replaced
Torklift could teach them plenty about quality and customer relations

acme verses ball info link
Super_Dave
Explorer
Sep 10, 2015
After reading the info in 54suds link, I think that I would personally stay with the ball screw for the mere reason that I could drop the jacks to the ground without power. The acme sounds like it needs power to do anything to overcome friction.
54suds
Explorer
Sep 10, 2015
after several hrs reviewing info on old and the new happi jacks it is my opinion they reduced parts costs ,reduced their production costs and then used "New" as an doubt-able!!!! EXCUSE to raise prices

relative experience:
4 years machine shop 4 years machinist mate Navy , 1 year production quality control inspector in metal fab at Bossert Mfg Utica ,ny 1 year machine op at Chicago pneumatic , 26 years supervisor of both metal fabrication and soap mfg industries , then 6 more years shop supervisor metal furniture products & fabrication in another factory site
bigfootford
Nomad II
Sep 10, 2015
54suds wrote:
with crappy jacks long long long of history of knowing they had poor quality issues and" knowingly "continue to produce and sell a substandard product ,why would anyone trust their statements about improvements . this is a company that for years did little or next Nothing to help the people stuck with their junk ,yes you could send them back for possible repair but only at an very high cost to the customer . In the past I personally have had to replace 6 of their jacks and right now have at least 3 that should be replaced
Torklift could teach them plenty about quality and customer relations

acme verses ball info link

16 years on my Hjac's. I use them a lot. Camper has close to 200,000 miles on it now. Just grease 2 times... Do have some rust on the outer shells. Rocks do create pits... Sand and paint soon.

Jim
54suds
Explorer
Sep 10, 2015
consider your self very lucky

this is my first run in with hj all four were just like this ( have many more pix ) less than 1 year old
hj denied any responsibility however Mark Holmes at Bigfoot stepped up and had them replaced when I showed them to him at the factory
Joe417
Explorer
Sep 10, 2015
No rants please. I know everyone has opinions on products. I've had Atwood manuals and now Happijac electrics, I've had only minor issues.

Back to my topic.

Does anyone have these on their camper yet or have you compared them with the ball screw jacks??
54suds
Explorer
Sep 10, 2015
need to replace one jack. It's bent just enough that it's pulling a lot of current, and sometime blows the fuse for the right side. The jack works great with a hand crank but I want all 4 to work with the remote.

with your past motor problems I'd suggest you change motors around to see you still blow fuses on that jack ( corroded plug ?)
egarant
Explorer III
Sep 10, 2015
Here is a write up on TCM on the new 4800 jack

4800
Glacier_D
Explorer II
Sep 11, 2015
Just replaced all my HJ 4500s with the 4800s. My 4500s were 3 years old (had 4600 before that) and not holding up at all. One 4500 seized up and the other 3 were not far behind. Hopefully the 4800s with the zinc platting will hold up better. I'll let you know after this winter.
Customer service at HJ was good, talk to Gary, he cut me a deal again.
AnEv942
Nomad
Sep 11, 2015
See-depends on user. The added braking of the acme screw would be enough for me to switch. The added capacity, length&weight, of the 4500 Id be tempted to replace both fronts.
Our Atwoods the fronts like to coast a bit after releasing button when lowering camper, to the point I often 'bump' the up to stop.