Hydraulic Hydro System

thcri · Feb 3, 2003

I did a search for this and found nothing on it so I thought I would create a new post. This discussion page is getting me addicted I think.

My question is on my TC29D and the hydraulic system. My dealer told me the Hydro Static Transmission uses the Hydraulic Fluid and checking the Hydraulic fluid also checks the Hydrostatic???? In the manual I only find one place to check the fluid but yet I find that there is a filter for both the Hydraulic Fluid and a filter for the Hydrostatic. Both are to be changed around every 50 hours. Are they both basically takin oil from a common sump?? And also checking hydraulic fluid with a FEL attached I always thought the loader and bucket was to be in a set position for checking?? Any help would be greatly appreciated. I hate calling my dealer as I feel like sometimes I can be a pest.

Murph

Casimir · Feb 3, 2003

Can't say positively on the TC29D, but my 1520 only has one hydraulic reservoir that feeds the HST, FEL and 3pt.

thcri · Feb 3, 2003

Do you have a separate filter for the HST and one for the Hydraulics?

Also with the 3 point and the FEL because of the position and the related Hydraulics don't the cyclinders have to be in the contracted position? My book says nothing about that. I would think that would change the level. I have a Bobcat backhoe and the bucket and arm have to be in a special position when checking the oil.

Murph

Bird · Feb 3, 2003

both basically takin oil from a common sump?

Yes, all one reservoir and only one place to check the level.

checking hydraulic fluid with a FEL attached I always thought the loader and bucket was to be in a set position for checking

In theory, I reckon that's true. In reality, don't worry about it. Your hydraulic cylinders are double acting cylinders so there's oil in both ends all the time. Now if you collapse the cylinder, then part of the space for that end is taken up by the rod so you don't have quite as much oil in the cylinder as you do when it's extended. So, if you'd like to always check the level with the cylinders collapsed, that's fine, but try it both ways and see how little difference it makes.

markie61 · Feb 4, 2003

TC40D Owner's Manual states: "IMPORTANT: There is a common sump for the transmission, rear axle, and hydraulic system." I also have 2 filters - one is called the Hydraulic System Oil Filter and the other HST System Oil Filter
Mark

Soundguy · Feb 5, 2003

My guess is the filter for the HST is catching finer particles than the one for the regular hydraulic system.... More going on inside the HST ....

Just my guess. /forums/images/graemlins/confused.gif

Soundguy :

jtn · Feb 5, 2003

I agree with Soundguy. The HST filter probably filters out finer particles but may also be less restrictive to allow more flow between the hysrostatic pump and motor.

In any case it is all one sump and I do not think the FEL cylinders are large enough to make a difference in the level.

JT

JATO_RaT · Feb 5, 2003

On my Kubota, the HST filter is a much heavier filter built for high pressure with a machined aluminum mating surface and high pressure cannister. The O ring is in a machined tight fitting groove. My hydraulic filters (2 big ones) are similar to oil filters but considerably longer. Everything draws from one reservoir.