Ducati Monster Forum

Moto Board => Tech => Topic started by: ian48th on July 26, 2025, 04:02:22 PM

Title: U-arm (arch) maintenance
Post by: ian48th on July 26, 2025, 04:02:22 PM
I've been ignoring the creaky rear suspension for a while.  I can feel vibrations in the arch/U-arm and suspect that the arch/rocker connection needs help.  Looking at the factory manual, I see that there are roller bearings in there.  Before I take it apart, is there anything I should know?  Replace the bearings, apply some grease, and done?  Any gotchas to look out for?
Title: Re: U-arm (arch) maintenance
Post by: stopintime on July 27, 2025, 01:31:38 AM
When I had mine replaced a couple of years ago, the only issue was to watch the number, condition and position of the spacers. Maybe also an open mind to the rocker axle/pin condition.
What about the upper and lower rod and damper connections? Ok?
Title: Re: U-arm (arch) maintenance
Post by: koko64 on July 27, 2025, 04:18:37 AM
Greasing the heim joints/rose joints, bushes and pins is easier with an electric or air powered grease gun. Manually massaging grease into the pivots bushes and shafts once disassembled sometimes is the only way if they are dry and creaky. It's not technically difficult just a pita.

A Ducati engine stand is invaluable.

It's an often neglected service item.
Title: Re: U-arm (arch) maintenance
Post by: ian48th on July 27, 2025, 10:10:06 AM
Sounds like it would be a good idea to order new bearings and spacers before starting.  FWIW, the bike is at 86,000 km.  I don't have a grease gun or engine stand, so I'll give it a good look-over before getting into it.  Or might even have the shop do it.

While I'm at it, I should try to grease other points on the bike that have also been neglected.
Title: Re: U-arm (arch) maintenance
Post by: Howie on July 27, 2025, 12:23:31 PM
Swing arms get neglected too.
Title: Re: U-arm (arch) maintenance
Post by: koko64 on July 28, 2025, 04:43:56 AM
Quote from: ian48th on July 27, 2025, 10:10:06 AMSounds like it would be a good idea to order new bearings and spacers before starting.  FWIW, the bike is at 86,000 km.  I don't have a grease gun or engine stand, so I'll give it a good look-over before getting into it.  Or might even have the shop do it.

While I'm at it, I should try to grease other points on the bike that have also been neglected.

You are right to weigh up if it's worth your time DIY vs working some overtime and paying a workshop you trust.

You're also correct to cast an eye over the various lube points. There are so many and they all contribute to the bikes smooth operation.