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Flap motor problems

 
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mike(at)glebe-farm.co.uk
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PostPosted: Wed Nov 21, 2007 2:02 pm    Post subject: Flap motor problems Reply with quote
All,
The flap motor on my recently completed RV6A stopped working at ~30hrs. Motor has a 1999 mfg date. First an intermittent fault, then froze with flaps up Removed the motor cap to find the brushes were caked with grease; looking at other posts it seems this isn't a new problem. Cleaned, refitted and checked operation, all fine. Reinstalled into the aircraft and while the flaps deploy quietly with approx 0.4A load, the motor assy is making a loud rasping noise when they retract and the current is approx 1A. Removed the motor for a second time, fully stripped and removed it from the gearbox. Perfectly clean and brand new appearance, nothing untoward. Reassembled motor, it's silent when bench-run out of gearbox, and actuation rod can be pushed in and out, spinning the drive pinion without a problem. Refitted the motor to the gearbox and had an assistant put a load on the actuator as it runs out. Rasping noise is back. Silent in the other direction on load.
Hmm. At $320 plus shipping and taxes it's an expensive 'just change it'. Has anyone else experienced this?
Mike Barnard
G-RVCE, England


No virus found in this outgoing message.
20/11/2007 17:44
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dale1rv6(at)comcast.net
Guest
PostPosted: Wed Nov 21, 2007 6:31 pm    Post subject: Flap motor problems Reply with quote
Sounds like the bearing spacers/washers are inadequate on one end in the motor. Or on the actuator gear. If the motor does not produce bad noise when removed and operated with pressure applied alternatively to each end or direction of motor shaft then the problem could be in the mounting of the actuator gears or thrust washers/spacers. Amazing how those noises can hide.
Dale


From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Mike Barnard
Sent: Wednesday, November 21, 2007 4:57 PM
To: rv-list(at)matronics.com
Subject: Flap motor problems


All,
The flap motor on my recently completed RV6A stopped working at ~30hrs. Motor has a 1999 mfg date. First an intermittent fault, then froze with flaps up Removed the motor cap to find the brushes were caked with grease; looking at other posts it seems this isn't a new problem. Cleaned, refitted and checked operation, all fine. Reinstalled into the aircraft and while the flaps deploy quietly with approx 0.4A load, the motor assy is making a loud rasping noise when they retract and the current is approx 1A. Removed the motor for a second time, fully stripped and removed it from the gearbox. Perfectly clean and brand new appearance, nothing untoward. Reassembled motor, it's silent when bench-run out of gearbox, and actuation rod can be pushed in and out, spinning the drive pinion without a problem. Refitted the motor to the gearbox and had an assistant put a load on the actuator as it runs out. Rasping noise is back. Silent in the other direction on load.
Hmm. At $320 plus shipping and taxes it's an expensive 'just change it'. Has anyone else experienced this?
Mike Barnard
G-RVCE, England

No virus found in this outgoing message.
20/11/2007 17:44
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mike(at)glebe-farm.co.uk
Guest
PostPosted: Fri Nov 23, 2007 12:33 am    Post subject: Flap motor problems Reply with quote
Hi Dale,
Many thanks for your comments. The motor itself seems fine - do you have experience of disassembling the actuator gears? Is the aluminum tube threaded into the cast housing?
Mike

From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Dale Walter
Sent: 22 November 2007 02:30
To: rv-list(at)matronics.com
Subject: RE: Flap motor problems


Sounds like the bearing spacers/washers are inadequate on one end in the motor. Or on the actuator gear. If the motor does not produce bad noise when removed and operated with pressure applied alternatively to each end or direction of motor shaft then the problem could be in the mounting of the actuator gears or thrust washers/spacers. Amazing how those noises can hide.
Dale


From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Mike Barnard
Sent: Wednesday, November 21, 2007 4:57 PM
To: rv-list(at)matronics.com
Subject: Flap motor problems


All,
The flap motor on my recently completed RV6A stopped working at ~30hrs. Motor has a 1999 mfg date. First an intermittent fault, then froze with flaps up Removed the motor cap to find the brushes were caked with grease; looking at other posts it seems this isn't a new problem. Cleaned, refitted and checked operation, all fine. Reinstalled into the aircraft and while the flaps deploy quietly with approx 0.4A load, the motor assy is making a loud rasping noise when they retract and the current is approx 1A. Removed the motor for a second time, fully stripped and removed it from the gearbox. Perfectly clean and brand new appearance, nothing untoward. Reassembled motor, it's silent when bench-run out of gearbox, and actuation rod can be pushed in and out, spinning the drive pinion without a problem. Refitted the motor to the gearbox and had an assistant put a load on the actuator as it runs out. Rasping noise is back. Silent in the other direction on load.
Hmm. At $320 plus shipping and taxes it's an expensive 'just change it'. Has anyone else experienced this?
Mike Barnard
G-RVCE, England

No virus found in this outgoing message.
20/11/2007 17:44
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AVG Free Date: 20/11/2007 17:44

20/11/2007 17:44
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dale1rv6(at)comcast.net
Guest
PostPosted: Fri Nov 23, 2007 10:19 am    Post subject: Flap motor problems Reply with quote
Hi, Sorry, I don’t know. Never took that one apart. Do you have an email address for Vans, I would ask them for info on problem, but sometimes you get help and sometimes you don’t.
Good luck,
Dale


From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Mike Barnard
Sent: Friday, November 23, 2007 3:31 AM
To: rv-list(at)matronics.com
Subject: RE: Flap motor problems


Hi Dale,
Many thanks for your comments. The motor itself seems fine - do you have experience of disassembling the actuator gears? Is the aluminum tube threaded into the cast housing?
Mike


From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Dale Walter
Sent: 22 November 2007 02:30
To: rv-list(at)matronics.com
Subject: RE: Flap motor problems
Sounds like the bearing spacers/washers are inadequate on one end in the motor. Or on the actuator gear. If the motor does not produce bad noise when removed and operated with pressure applied alternatively to each end or direction of motor shaft then the problem could be in the mounting of the actuator gears or thrust washers/spacers. Amazing how those noises can hide.
Dale


From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Mike Barnard
Sent: Wednesday, November 21, 2007 4:57 PM
To: rv-list(at)matronics.com
Subject: Flap motor problems


All,
The flap motor on my recently completed RV6A stopped working at ~30hrs. Motor has a 1999 mfg date. First an intermittent fault, then froze with flaps up Removed the motor cap to find the brushes were caked with grease; looking at other posts it seems this isn't a new problem. Cleaned, refitted and checked operation, all fine. Reinstalled into the aircraft and while the flaps deploy quietly with approx 0.4A load, the motor assy is making a loud rasping noise when they retract and the current is approx 1A. Removed the motor for a second time, fully stripped and removed it from the gearbox. Perfectly clean and brand new appearance, nothing untoward. Reassembled motor, it's silent when bench-run out of gearbox, and actuation rod can be pushed in and out, spinning the drive pinion without a problem. Refitted the motor to the gearbox and had an assistant put a load on the actuator as it runs out. Rasping noise is back. Silent in the other direction on load.
Hmm. At $320 plus shipping and taxes it's an expensive 'just change it'. Has anyone else experienced this?
Mike Barnard
G-RVCE, England

No virus found in this outgoing message.
20/11/2007 17:44
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