View Full Version : Eaton 751...help!

10-25-2001, 02:13 AM
I need info on how to drain and fill this hydro unit. I have gone to Eaton's web site and down loaded the schematic. I have read it backwards and forwards but no where do they mention how to drain and refill this drive pump. This pump has no filter and is used on Ferris SD36" and SD48"s. I talked to my Ferris dealer and without blasting them.........I'ld rather ruin these units myself than to pay some one to do it for me!! Any help would greatly be appreciated. Thank you!

Richard Martin
10-25-2001, 06:58 AM
Actually what you have there is not a pump, it is a transaxle. It does have an internal oil filter. I highly recommend getting a factory service manual before any repairs or maintenance work is done. Replacement costs are close to $1000.00 on these units.

10-25-2001, 09:24 AM
here you are.....

Changing Hydrostatic Transmission Fluid

The hydrostatic fluid should be changed every 1000
hours or two (2) years. Also, the fluid should be
changed if the natural color of the fluid has become
black or milky (indicating possible overheating or
water contamination of fluid). The transmission may
be refilled using any of the fluids listed in
Specifications. The fluid is changed as follows:
1. Park the mower on a level surface and stop the
2. Remove the lower drain plug and the air bleed
plug. Allow the fluid to drain out.

IMPORTANT: Clean any dirt from around the
plugs and reservoir cap before removing them.

3. Reinstall the lower drain plug, making sure the
rubber O-ring on the plug is in place and in
good condition.
4. Refill the transmission through the air bleed
plug hole until it is as full as possible.

IMPORTANT: Avoid fluid contamination when
filling the reservoir. Use clean container, spout,
funnel, etc. when pouring the fluid into the

5. Rotate the transmission input shaft about five (5)
revolutions to allow any trapped air to escape.
6. Before installing the air bleed plug, fill the
with fluid allowing a small amount to leak
out of the air bleed plug hole.
7. Install the air bleed plug and fill the reservoir
the COLD level line.


Gary LA
01-28-2002, 03:20 PM
captdevo knows whats up.
It was real fun for me trying to finagle a way to get that fluid threw that little bitty hole.
I bought the power brake bleeder with the hand pump?,
Its slow but darn near necessary.

10-04-2010, 07:42 PM
i just loosen the small plate where the internal filter is and let it drain there.