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Old 02-08-2019, 02:05 PM
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Question Bobcat and Oil question for Shade Tree welder

Figured you the go-to guy for this...

My 98 bobcat 630 fluid for the hydraulics, I want to be sure I'm using the right
oil.
so I called one of the repair/service dealers and they were not 100% positive but said it should be a straight 30 weight oil.

Not a 303 or any other hydraulic fluid, does this sound right to you.

I have a new hydrostatic trans I bought for it and don't want to screw it up...
mostly because the warranty ran out because I had no time to drop it in due to working on other peoples stuff... I haven't even got it installed yet but need to this coming week...
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Old 02-08-2019, 03:06 PM
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I would recommend this:

https://www.mystiklubes.com/do/produ...D_AG/663509002

Any good quality universal transmission/ hydraulic fluid is fine. I use the Mystik/ CITGO brand.
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Old 02-08-2019, 04:51 PM
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Dont install the new trans unless you have also rebuilt your wheel motors and flushed all the lines.
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Old 02-08-2019, 05:14 PM
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I was told 10/30 in everything chain case and hyd. in a 741.742,743
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Old 02-08-2019, 06:16 PM
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Quote:
Originally Posted by Walker View Post
Dont install the new trans unless you have also rebuilt your wheel motors and flushed all the lines.
yes was going to pull them off and clean them out and check for any wear or damage, flush the lines and then get it all back together and hope its all
muy Bueno'cause this year I need to clear the back property lines and rid my self of a bunch of no good leaf-dropping trees and with that some squirrel issues fewer trees fewer squirrels no more tools or shop equipment getting the wires chewed off them, in theory...
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Old 02-08-2019, 06:18 PM
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Quote:
Originally Posted by digr View Post
I was told 10/30 in everything chain case and hyd. in a 741.742,743
THank you SahdeTW and digr...
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Old 02-09-2019, 02:05 PM
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Unless you know what is in there already, a drain and flush is critical.

I do cringe when hydraulic systems call for engine oils, the dispersants
(detergents) in the oil will absorb and hold water that can cause rust and
corrosion issues. In use in an engine the oil get hot enough to drive off
any absorbed water, hydraulic systems rarely do. Now you can find
non-detergent engine oils, that solves that issue. In this case I would
still recommend a Universal Tractor Transmission/Hydraulic Oil. It has
what you need to protect your system and transmit power. If you attached
any implements to the system you need to flush and refill them as well.
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Old 02-25-2019, 09:59 PM
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Quote:
Originally Posted by Shade Tree Welder View Post
Unless you know what is in there already, a drain and flush is critical.

I do cringe when hydraulic systems call for engine oils, the dispersants
(detergents) in the oil will absorb and hold water that can cause rust and
corrosion issues. In use in an engine the oil get hot enough to drive off
any absorbed water, hydraulic systems rarely do. Now you can find
non-detergent engine oils, that solves that issue. In this case I would
still recommend a Universal Tractor Transmission/Hydraulic Oil. It has
what you need to protect your system and transmit power. If you attached
any implements to the system you need to flush and refill them as well.
Yep, I get that. and seemed to be the wrong thing to put in one. But I finally got ahold of the one dealer who said for sure it uses straight non-detergent 30w engine oil which really sucks as it 150 bucks for 5-gallon pail here.
that's sort of stupid high for it, isn't it?

but anyways I have another Oil related question for you I'll start in a separate thread. We should have a separate oil base thread question section to pester you with Ron.
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Old 02-25-2019, 10:18 PM
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Quote:
Originally Posted by MetalWolf View Post
We should have a separate oil base thread question section to pester you with Ron.
No, but they should be posted in Mechanical & Electrical, not in Off Topics.
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Old 02-25-2019, 10:22 PM
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Quote:
Originally Posted by cutter View Post
No, but they should be posted in Mechanical & Electrical, not in Off Topics.
Maybe you might move the two threads to the appropriate forms and ill remember it next time.

And this.
Quote:
We should have a separate oil base thread question section to pester you with Ron.
was meant solely as joking around...
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