are the servo's adjustable on a 853

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bmiker

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Feb 2, 2007
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I have a 853 with the electric asist on the controls for the hydralicis are they any way to adjust so they are not so sentisive. . Also would chevron 32w hydlalic oil be ok use in a bobcat. thanks
 

skidsteer.ca

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You want to use a engine oil, 10/30 or 5/30 if your in a cold climate. Regular hydraulic oils, regardless of weight do not have the lubrication that the hydrostatic drive needs.
I'm not aware of a electric over hydraulic system on the steering. If they made one I'm not familiar with it.
My 853 has morse cables connected directly to the hydrostat, about the only adjustments is 1 to be certain you get full speed forward and reverse on either side.
2 that both sides return to neutral when you let go of the sticks.
My machine has a slight lag in responce, you push the stick to point “x” and 1/2 a second later the wheels react to the movement of the steering stick. This combined with the very low effort required to move the sticks makes doing fine movements a bit of a pain.
As far as I know that is the way they are, perhaps the other 853 guys can chime in here.
I do know that my 553 and 773 are easier to get used to
Ken
 

perry

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You want to use a engine oil, 10/30 or 5/30 if your in a cold climate. Regular hydraulic oils, regardless of weight do not have the lubrication that the hydrostatic drive needs.
I'm not aware of a electric over hydraulic system on the steering. If they made one I'm not familiar with it.
My 853 has morse cables connected directly to the hydrostat, about the only adjustments is 1 to be certain you get full speed forward and reverse on either side.
2 that both sides return to neutral when you let go of the sticks.
My machine has a slight lag in responce, you push the stick to point “x” and 1/2 a second later the wheels react to the movement of the steering stick. This combined with the very low effort required to move the sticks makes doing fine movements a bit of a pain.
As far as I know that is the way they are, perhaps the other 853 guys can chime in here.
I do know that my 553 and 773 are easier to get used to
Ken
Ken, I use shell-rotella in my sports car, It DID have extra lubricating agents including extra zinc. If I remember correctly, shell changed/reduced some of these lubricating?.
What brand of 10/30 do you use?.

Thanks,
Perry
 

skidsteer.ca

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Ken, I use shell-rotella in my sports car, It DID have extra lubricating agents including extra zinc. If I remember correctly, shell changed/reduced some of these lubricating?.
What brand of 10/30 do you use?.

Thanks,
Perry
We run there rotella t in all our engines, weight depends on season, expected # of cold starts etc. Not sure what they may have changed over the years.
Shell mostly because it is readily available here, and it has a good reputation. For hydrostats any decent quality motor oil apropriate for the ambient temp whould be fine.
I used to run mobile 1 synthetic in my 71 mustangs motor, but i'm not sure it really make a difference.
There is something to be said for synthetics for cold starts though. 0/30, 0/40 and 5/30 for engines seeing alot of cold starts, sure saves starter, battery and wo knows what all else.
Ken
 

bmiker

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My queston was about the hydraulics for the loader. I know that they use servos on the 853 to make it easyer to operate. I was wanting to know it these can be adjuster or done away with I mostly use this machine for a fork lift and the foot controls are to touchey.And while I asking questions if its good to use engine oil for the hYdrastat drive then it must be ok for the other hydralic pumps for the lift . Not to be hard headed but what is hydraulic oil for.This is my first skeed steer & I dont know much about them. thanks for your help I appreciate it.
 

skidsteer.ca

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My queston was about the hydraulics for the loader. I know that they use servos on the 853 to make it easyer to operate. I was wanting to know it these can be adjuster or done away with I mostly use this machine for a fork lift and the foot controls are to touchey.And while I asking questions if its good to use engine oil for the hYdrastat drive then it must be ok for the other hydralic pumps for the lift . Not to be hard headed but what is hydraulic oil for.This is my first skeed steer & I dont know much about them. thanks for your help I appreciate it.
The reservoir is the same for both the hydralics (loader up down and tilt) and the hydrostats. They share the same oil. 10/30 is recommended for the chain case that runs from the hydro motors to th axels as well.
Only the fan drive uses 80/90 gear oil in the angle drive aluminum gear case just below the blower.
They only thing I can recommend on the foot pedals is try lubricating all the pivot point to reduce any friction. The pedals on my 853 are actually quite smooth. It the best out of all my loaders. The steering however does not lend itself to fine work.
I'm not sure if the other 853 guys experience this or not.
 

Tazza

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The reservoir is the same for both the hydralics (loader up down and tilt) and the hydrostats. They share the same oil. 10/30 is recommended for the chain case that runs from the hydro motors to th axels as well.
Only the fan drive uses 80/90 gear oil in the angle drive aluminum gear case just below the blower.
They only thing I can recommend on the foot pedals is try lubricating all the pivot point to reduce any friction. The pedals on my 853 are actually quite smooth. It the best out of all my loaders. The steering however does not lend itself to fine work.
I'm not sure if the other 853 guys experience this or not.
Hydraulic oil is made for hydraulic systems, not hydrostatic systems like skid steers use. In a *standard* hydraulic system there is a gear or vane pump that has limited moving parts and low viscosity oil works well. However, hydrostatic or piston pump systems have lots of moving parts that require heavier oil to keep them lubricated or failure can and will occur. I think heat may pay a large part in this too.
When i got my first bobcat i thought the oil couldn't be rite, it was using engine oil!!! but a quick call to bobcat and they confirmed that it MUST run heavier oil like 10w30 for the hydrostatics. They said to never ever use hydraulic oil as it will damage the pumps.
 

bmiker

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Feb 2, 2007
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Hydraulic oil is made for hydraulic systems, not hydrostatic systems like skid steers use. In a *standard* hydraulic system there is a gear or vane pump that has limited moving parts and low viscosity oil works well. However, hydrostatic or piston pump systems have lots of moving parts that require heavier oil to keep them lubricated or failure can and will occur. I think heat may pay a large part in this too.
When i got my first bobcat i thought the oil couldn't be rite, it was using engine oil!!! but a quick call to bobcat and they confirmed that it MUST run heavier oil like 10w30 for the hydrostatics. They said to never ever use hydraulic oil as it will damage the pumps.
Thanks a lot up to now I wasn't sure about the hyd. oil now I understand now & I'll be adding 10w30 oil to my reservor its been a little low for a while. thanks skidsteer & tazza . Can you address the servo question on the lift system I guess these are not adjustable thanks for your help Mike--
 

Tazza

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Thanks a lot up to now I wasn't sure about the hyd. oil now I understand now & I'll be adding 10w30 oil to my reservor its been a little low for a while. thanks skidsteer & tazza . Can you address the servo question on the lift system I guess these are not adjustable thanks for your help Mike--
Sorry, i don't own a late model machine, this is one for ken.
 

bigman

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Jan 31, 2007
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Sorry, i don't own a late model machine, this is one for ken.
The only electrical assist i know about is on AHC or ACS Machines if this is what you have you can calibrate the handles if this does not work use foot controls (or fit them).Early 853 had a very sensitive assist Hydraulic for the drive only.
 

skidsteer.ca

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The only electrical assist i know about is on AHC or ACS Machines if this is what you have you can calibrate the handles if this does not work use foot controls (or fit them).Early 853 had a very sensitive assist Hydraulic for the drive only.
I have never seen anything in the manual about adjusting the lag, or lack of feed back from the steering. That is what your refering to? as the foot pedals on my loader are as nice to use as any other bobcat I have run.
Perry has hand controls in his, however I don't believe they are anyhting like the new electric over hydraulic joystick controls in the new loader. I believe they are just a morse cable that mechanically links the pivoting top of the steering lever to the loader control valve.
The steering levers on my 853 are linked to the hydrostatic pumps with morse cables as well. There is no electrics involved here either. I'm not sure where the term “servo” comes from for these machines as I see nothing in the manual about a system any different then mine. Also the 853 was only made for a few years, and I don't know if the 863 also used the same hydrostat.
The 700 series machines have some feedback into the steering sticks. The 853 does not.
If a 700 machine is traveling 1 mph and push the sticks full forward to say 6 mph, the effort to push and hold the sticks at 6 mph is heavier (greater effort required) until the machine catches up to the speed where the sticks are being held. Likewise if you are traveling 3 mph and begin to push into a pile of gravel which slows the loader down do to the effort it must produce to fill the bucket, the sticks will push harder trying to get themselves back to neutral, this helps the operator “downshift” the travel speed to a slower speed, where the hydrostatic transmission has more torque.
The 853 the sticks move so easy, such a light effort, and even worse is that here is a lag in response, you want 1/2 a mph forward to pickup a new attachment so you begin to push the sticks forward, and for a split second nothing happens, so you continue to push the stick further forward, then wham your doing 2 1/2 mph instead of 1/2. They are so light that it s also hard to feel if you pushed both sticks a even amount to go straight forward. So at slow speeds you tend to wander to one side or the other.
I don't know of any way to get this out of the loader, I don't know what is designed different, but it doesn't act like any other skid I have run.
Does this sound like other 853s? or like the problem your having with it being too sensitive?
I'd like to hear of some things that may help. Its ok (not good, but ok) once you get used to it, but it is a pain if you jump from loader to loader.
Ken
 
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