Pivot housing stuck on drive - I need some help

tstewart1

Seaman Apprentice
Joined
Sep 21, 2011
Messages
44
Hello,

I have two DP-SM1 drives. I had to pull one of the drive's in order to fix a hydraulic line. After following the service manual instructions for pulling the drive, I was unable to get the drive to separate from the pivot housing. I ended up removing the pivot housing + drive by removing the pivot bolts, disconnecting the bellows and water line then pulling the drive/pivot housing out. Now that the drive and pivot housing are removed, I am trying to get the pivot housing and drive apart. I have tried the following:

- Lot's of PB Blaster on the 6 studs
- Gently trying to pry the pivot hosing/drive apart by putting a wedge in the gap at the top of the drive
- Heating up the studs and area on the drive where they go through (used both propane and map gas)
- Banging on the studs
- Used a small cold chisel along the seam

At this point I am completely out of ideas. I have read multiple posts regarding similar problems on this site and so far I am not having much luck. Is there something stupid I am missing such as a hidden bolt? I have attached a picture of the drive I have been working on. BTW, to get the 2nd drive off I had to do the same thing (remove pivot housing/drive at same time). When I disconnected the ujoint bellow lot's of water came out. The gimble turns easy but it seems to "catch a little". I assume the gimble should be replaced, right? I have attached pictures of the gimble/ujoint that had the water.

Any suggestions would greatly be appreciated.

Thanks

Tim
 

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tstewart1

Seaman Apprentice
Joined
Sep 21, 2011
Messages
44
Re: Pivot housing stuck on drive - I need some help

I read on a different site where it could be corrosion or mineral deposits between the bearing carrier and the pivot housing. I guess I will try to heat the top of the pivot housing in the general area of the bearing carrier. Any other suggestions would be appreciated

Tim
 

tstewart1

Seaman Apprentice
Joined
Sep 21, 2011
Messages
44
Re: Pivot housing stuck on drive - I need some help

Any suggestions on the gimbal? Does it need to be replaced? What is the correct part number, I see two in the parts diagram:

3853807 - gimbal bearing
3855707 - gimbal bearing
3852548 - ginbal bearing seal

I need to replace the bearing and seal right? Anything else?

Thanks

Tim
 

tstewart1

Seaman Apprentice
Joined
Sep 21, 2011
Messages
44
Re: Pivot housing stuck on drive - I need some help

Hello,

This is just a followup in case others have the same problem. It turns out that the 6 studs on the pivot housing were corroded which is the reason the pivot housing would not separate from the drive. To get it off, I did the following:

- Heated the bolts with map gas (heated the bolts themselves)
- Banged on the end of the bolts using a hammer and a 10" 1/2" bolt
- Banged on all 6 bolts in a crisscross pattern

Eventually, the pivot housing separated. It just took some time and effort. In retrospect, I should have used a brass drift since I flattened the studs and had to replace them.

Tim


Any suggestions on the gimbal? Does it need to be replaced? What is the correct part number, I see two in the parts diagram:

3853807 - gimbal bearing
3855707 - gimbal bearing
3852548 - ginbal bearing seal

I need to replace the bearing and seal right? Anything else?

Thanks

Tim
 
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