753 drive motor

digsalot · Jul 16, 2017

I have a 1996 753. Both my motors are bad. I pulled them off and inspected them. on the bottom of the pump is 3 orings with plastic covers. My center orings were just little granules like coffee grinds. the center oring on 1 motor was missing and the plastic cover was in several chunks. Does this motor require timing? The rollers fell out of 1 motor. Is this bad? There's light marks on the georotor cover. Will that cause problems? will probably touch them up with sandpaper on a piece of glass. Thanks

Tazza · Jul 17, 2017

I had a machine that had Orings like that. I bought new Orings from a seal shop, cost me like five bucks per motor. This will only work if the blactic back up rings are not cracked.
Does this motor have a small dog bone looking gear that links the geroler to the valve plate that is where the fluid comes in? If so, yes it needs timing.
If you need a manual on this, look up my profile and email me, i'll dig up the manual for you.
Loose rollers isn't great, but it does take a lot for it to not work at all.

digsalot · Jul 17, 2017

Tazza said:
I had a machine that had Orings like that. I bought new Orings from a seal shop, cost me like five bucks per motor. This will only work if the blactic back up rings are not cracked.
Does this motor have a small dog bone looking gear that links the geroler to the valve plate that is where the fluid comes in? If so, yes it needs timing.
If you need a manual on this, look up my profile and email me, i'll dig up the manual for you.
Loose rollers isn't great, but it does take a lot for it to not work at all.

There not loose when put together. was trying to keep them in the same spots but they decided otherwise. I think the timing thing is getting the notch in the right place. some of my backup rings are in several pieces. between the pump and these motors I'm getting a pretty good education.

Tazza · Jul 19, 2017

digsalot said:
There not loose when put together. was trying to keep them in the same spots but they decided otherwise. I think the timing thing is getting the notch in the right place. some of my backup rings are in several pieces. between the pump and these motors I'm getting a pretty good education.

They do fall out easily, do your best to hold them in place.
Broken backup rings means you do need a seal kit, loader parts source have seal kits, they should be cheaper than the dealer.
Pretty sure you will need to time this motor when you get the seal kit.

digsalot · Jul 25, 2017

Tazza said:
They do fall out easily, do your best to hold them in place.
Broken backup rings means you do need a seal kit, loader parts source have seal kits, they should be cheaper than the dealer.
Pretty sure you will need to time this motor when you get the seal kit.

all back together. works good. now my auxiliary is jacked up.