Swing motor problem on Bobcat 337

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rurban22

New member
Joined
Sep 29, 2013
Messages
3
After using my Bobcat 337 for a short amount of time I am having a problem with my swing. It almost seems like I have something hanging up inside the motor. The swing motor gets really hot on the top cover and it takes a lot to slew in a circle. The machine has 3300 hours on it and all other hydraulic functions work fine when this happens. As soon as I let he machine sit for 10 minutes or so it goes back to normal until it heats up again. Has anyone had anything similar to this. Could it be possible that the brakes are hanging up inside the motor causing this or is it the motor itself? Any insight would be greatly appreciated. Thanks
 

7LBSSMALLIE

Well-known member
Joined
Feb 2, 2012
Messages
1,280
sounds like brake seal is leaking. easy to prove easy to fix. keep in mind the brake is spring applied pressure released/ round tking 18 or so allen head bolts big nut in center/ pull big nut should be no oil. if there is piston seal is blown. remove cover rember there is spring pressure .alt loosening in a cross pattern. apply air to brake line CAUTION THIS IS A CANNON. replace quad seal and reasmmble. easy breezy.
 

7LBSSMALLIE

Well-known member
Joined
Feb 2, 2012
Messages
1,280
sounds like brake seal is leaking. easy to prove easy to fix. keep in mind the brake is spring applied pressure released/ round tking 18 or so allen head bolts big nut in center/ pull big nut should be no oil. if there is piston seal is blown. remove cover rember there is spring pressure .alt loosening in a cross pattern. apply air to brake line CAUTION THIS IS A CANNON. replace quad seal and reasmmble. easy breezy.
how did make out here dude. I would rather not reread this case if has been rectified?
 

AAD build

New member
Joined
Oct 9, 2022
Messages
3
After using my Bobcat 337 for a short amount of time I am having a problem with my swing. It almost seems like I have something hanging up inside the motor. The swing motor gets really hot on the top cover and it takes a lot to slew in a circle. The machine has 3300 hours on it and all other hydraulic functions work fine when this happens. As soon as I let he machine sit for 10 minutes or so it goes back to normal until it heats up again. Has anyone had anything similar to this. Could it be possible that the brakes are hanging up inside the motor causing this or is it the motor itself? Any insight would be greatly appreciated. Thanks
I have a similar problem at similar hours. The swing works for the first couple of minutes and then slows to a stop. The service manual says it could be several things including the swing brake or valves. Somone else here on a 447 reported a similar issue and it ended up being a piston seal. That sounds like a big job so it would be good to know before pulling the swing motor out.
 
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