- Location
- East Tyrone
Vac pump gearbox cog removal
- Thread starter flatliner
- Start date
john432
Member
- Location
- Carmarthenshire
Take the outside nut off, but the rotor will rotate ! So you need to jam the cog with a piece of angle iron, anything suitable against the inside of the housing. Then the cog is held on by the keyway in the rotor shaft, think space is limited for a puller set,so try a chisel or pry bar up behind it. If that fails weld the cog to a piece of pipe, with something welded to form a T ,then just get the big hammer out!
john432
Member
- Location
- Carmarthenshire
Too aggressive start ups??
davidroberts30
Member
- Location
- pembrokeshire
cut the cog off,its fooked anyway
Happy hillbily
Member
- Location
- Uwchaled, North Wales
I have just rebuilt my jurrop vac pump (seals had gone either end) couldnt get the small cog off, it was locked solid on to the taperd shaft, had to cut it off. Not sure if the mec pump is the same.
I would certanly recomend going right through the pump, and fit new vanes anyway as your at it.
I would certanly recomend going right through the pump, and fit new vanes anyway as your at it.
Last edited:
mengeleguru
Member
- Location
- Derbyshire
When you have stripped it down check if the rotor isn't bent as the shafts dont go right through . .
If it is may as well buy a new pump .
If it is may as well buy a new pump .
- Location
- East Tyrone
John432 has got it in one. Soft start had quit working on the tractor, rotor turning freely by hand so I think the vanes are ok. Cheers for the tips, i'll give it a go tomorrow .
Once you get the nut off, take the complete gearbox housing off the rotor housing, complete with rotor. The local expert has a large piece of pipe, sitting vertically that the rotor can drop into, long enough that the rotor won’t touch the ground.
Drop the rotor into the pipe vertically, being careful not to nip fingers. Then lift the complete rotor assembly 6 inches and drop, keeping hands clear. The weight of the rotor falling should break the taper and the rotor will drop out. The experts make it look sensible.
If you don’t have a piece of pipe large enough, you could knock a little stand up with a few pieces of scrap iron, or a few concrete blocks.
Drop the rotor into the pipe vertically, being careful not to nip fingers. Then lift the complete rotor assembly 6 inches and drop, keeping hands clear. The weight of the rotor falling should break the taper and the rotor will drop out. The experts make it look sensible.
If you don’t have a piece of pipe large enough, you could knock a little stand up with a few pieces of scrap iron, or a few concrete blocks.
Stock
Member
- Location
- The Emerald Kingdom,
My method would be to dismantle the front of the pump pull pot the rotor remove the vanes then open the nut and cut the gear off replace the bearing new gear and seal, wash the vanes check for damage replace if necessary then reassemble.........................................
Pheasant Surprise
Member
- Location
- Woodbridge, Suffolk
Do they spec. a certain amount of runout on the rotor?
On screw comp. rotors the tolerance is very small and it doesn't take much at all to ruin an air end.
It would be a shame for the OP to spend only to find the pump was utterly stuffed as the rotor was warped.
- Location
- East Tyrone
Pheasant Surprise
Member
- Location
- Woodbridge, Suffolk
The heat from welding probably helped too. Nicely done.Worked a treat!