753 Oil Leak

mitchash · Jul 20, 2011

I just bought a Bobcat 753 that I knew it would need some work but for the price I couldn't pass it up. It runs and works well. The owner said it had a axle seal leaking. I did notice a small leak towards the back but all the levels were in the safe part on the dip stick. Last night I went out to the garage to look at something and noticed a big puddle of hydrulic oil under and on the right side of the skid steer. I didn't have time to see where it was exactly comming from. Could it be the axle leaking that bad? What would be involved with replacing seals on this machine? I can do most of the work on it myself and I have a friend that's good at working with this stuff. Where can I get a service and parts manual?

mitchash · Jul 22, 2011

I finally got a better look at it, the axles seem ok not much oil there. The hydraulic oil seemed to be coming from under the engine in the back. I tipped up the caged and the pump in the back (the one that the levers go to that control the speed) is wet with oil, I can't tell if its the seals or a hose. How big and expensive of a job is this going to be to fix?

mitchash · Jul 24, 2011

Where is the best place to get a service manual for my 753?

mitchash · Aug 3, 2011

My 753 seems to have leaked most of it's hydrulic oil out just sitting in the garage. I haven't ran it in a couple of weeks and the oil level was good then. Now the tank is about empty and there is a huge puddle of oil that seems to be comming from under the engine in the back or between the seat and engine). If it was the tandem pump (which is wet with oil) it would need to be running to leak like that wouldn't it? Thanks, Ash

SSdoxie · Aug 3, 2011

The hydraulic tank is just above the gear pump. So any leak in the tank or lines and fittings into will drip on the gear pumps. Check for leaks in tank itself, suction hose from tank to gear pump, and case drain line (small hose going into bottom of the tank).

mitchash · Aug 5, 2011

The tank and bracket on top of the drive pump are dry. I need a steam genny to clean this thing!

mitchash · Aug 21, 2011

My 753 has leaked most of it's hydraulic oil out. I need to move it to clean and repair. Can these be moved with a tractor or winch without running?

SSdoxie · Aug 21, 2011

If it is a slow leak, better to put some oil in it and drive it then drain oil back inot a clean container and reuse it. Brakes are locked with engine off, so you can drag it but no good way to tow and allow wheels to turn.

SAPP99 · Aug 22, 2011

I WAS READING YOUR PROBLEM ABOUT A HYDRAULIC LEAK AND I HAVE A COUPLE OF SUGGESTIONS. MY FIRST SUGGESTION WOULD BE TO CHECK
AROUND THE ALUMINUM TRIANGLE LEVERS THAT ARE BOLTED TO SHAVES ON THE HYDROSTATIC PUMP AND ARE HOOKED UP TO THE BLACK STEERING LEVERS. IF THERE IS HYDRAULIC OIL AROUND THERE THEN YOUR SEAL AROUND THE SHAVES ARE FLAT OR WORN. BOBCAT CALLS THESE SEALS PINTLE SEALS.
SECOND SUGGESTION WOULD BE TO CHECK THE HYDRAULIC HOSE THAT RUNS FROM THE BACKSIDE OF HYDROSTATIC PUMP TO THE HYDRAULIC FILTER HOUSING TO SEE IF IT IS LEAKING.
MY FINAL SUGGESTION WOULD BE TO CHECK BETWEEN THE TWO HALVES OF THE HYDROSTATIC PUMP. THE HYDROSTATIC PUMP HAS TWO SECTIONS ONE FOR THE LEFT SIDE DRIVE AND ONE FOR THE RIGHT SIDE DRIVE AND THE TWO ARE BOLTED TOGETHER WITH A METAL GASKET IN BETWEEN THEM.
LET ME KNOW WHAT YOU FIND GOOD LUCK.

mitchash · Aug 24, 2011

I haven't had a chance to take it apart yet but I do notice that the left steering pump is wet with oil. If it was the pump seals leaking would it still drain the oil tank without running? The tank went from full to low in a few days. I'm hoping it's just the hoses in the rear of the pump.