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Bobcat 763 mysteriously using hydraulic oil

AdamjEdgar

AdamjEdgar

Member
Joined
Jun 18, 2018
Messages
8
Location
Sydney
I haven't pulled motor apart yet. Getting the housing out in order to sort out the main shaft seal has turned out to be a nightmare. The bottom rear most bolt is almost impossible to get at...and even though I 0ulled the front drain plug, there is still 3-4 inches of chain case oil in the machine.

I am going to purchase a 15/16" ratchet/geared ring spanner...its the only thing that will go in at the right angle of rotation in order to undo this last bolt (normal ring spanner either hits the chain case opening border or, hits the drive sprockets). Socket hits chains and brake plates!
I would take a photo of this but with oil still in there, photo is pointless.
Also need to syphon out the remain oil...which I estimate is at least 10 litres.
How do they normally get out all the oil...as it is I would have to lift the back ofthe machine up at least 3 feet in the air to drain it through the front bung...that's ridiculous!
 
willie59

willie59

Administrator
Joined
Dec 21, 2008
Messages
13,396
Location
Knoxville TN
Occupation
Service Manager
There's a drain plug at the rear of the chain case, access is under the belly of the machine, not that easy but it's there. Failed motor carrier seal is typically caused by failed or failing drive motor, too much internal leakage which puts pressure on the motor carrier seal and pops it. It can be caused by aged motor carrier seal, case drain filters give somewhat an indication of motor condition, filter full of debris for sure indicates failing/failed motor, clean case drain filter, mmm, could be just an aged and failed motor carrier seal. Removing that motor carrier is a real task. It's been years since I've worked on one of those so the cobwebs in my head are excessively thick, and I could be wrong, but seems I've replaced that motor carrier seal with the motor carrier still mounted. Been too many years for me to confirm that though.
 
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